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666 lines
24 KiB
666 lines
24 KiB
/*
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.swing;
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import javax.swing.text.*;
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import javax.swing.plaf.*;
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import javax.accessibility.*;
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import java.io.ObjectOutputStream;
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import java.io.ObjectInputStream;
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import java.io.IOException;
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import java.io.*;
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import java.util.Arrays;
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/**
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* <code>JPasswordField</code> is a lightweight component that allows
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* the editing of a single line of text where the view indicates
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* something was typed, but does not show the original characters.
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* You can find further information and examples in
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* <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/textfield.html">How to Use Text Fields</a>,
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* a section in <em>The Java Tutorial.</em>
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* <p>
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* <code>JPasswordField</code> is intended
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* to be source-compatible with <code>java.awt.TextField</code>
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* used with <code>echoChar</code> set. It is provided separately
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* to make it easier to safely change the UI for the
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* <code>JTextField</code> without affecting password entries.
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* <p>
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* <strong>NOTE:</strong>
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* By default, JPasswordField disables input methods; otherwise, input
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* characters could be visible while they were composed using input methods.
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* If an application needs the input methods support, please use the
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* inherited method, <code>enableInputMethods(true)</code>.
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* <p>
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* <strong>Warning:</strong> Swing is not thread safe. For more
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* information see <a
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* href="package-summary.html#threading">Swing's Threading
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* Policy</a>.
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* <p>
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* <strong>Warning:</strong>
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* Serialized objects of this class will not be compatible with
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* future Swing releases. The current serialization support is
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* appropriate for short term storage or RMI between applications running
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* the same version of Swing. As of 1.4, support for long term storage
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* of all JavaBeans™
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* has been added to the <code>java.beans</code> package.
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* Please see {@link java.beans.XMLEncoder}.
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*
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* @beaninfo
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* attribute: isContainer false
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* description: Allows the editing of a line of text but doesn't show the characters.
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*
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* @author Timothy Prinzing
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*/
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public class JPasswordField extends JTextField {
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/**
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* Constructs a new <code>JPasswordField</code>,
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* with a default document, <code>null</code> starting
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* text string, and 0 column width.
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*/
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public JPasswordField() {
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this(null,null,0);
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}
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/**
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* Constructs a new <code>JPasswordField</code> initialized
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* with the specified text. The document model is set to the
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* default, and the number of columns to 0.
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*
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* @param text the text to be displayed, <code>null</code> if none
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*/
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public JPasswordField(String text) {
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this(null, text, 0);
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}
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/**
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* Constructs a new empty <code>JPasswordField</code> with the specified
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* number of columns. A default model is created, and the initial string
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* is set to <code>null</code>.
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*
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* @param columns the number of columns >= 0
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*/
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public JPasswordField(int columns) {
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this(null, null, columns);
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}
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/**
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* Constructs a new <code>JPasswordField</code> initialized with
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* the specified text and columns. The document model is set to
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* the default.
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*
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* @param text the text to be displayed, <code>null</code> if none
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* @param columns the number of columns >= 0
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*/
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public JPasswordField(String text, int columns) {
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this(null, text, columns);
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}
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/**
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* Constructs a new <code>JPasswordField</code> that uses the
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* given text storage model and the given number of columns.
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* This is the constructor through which the other constructors feed.
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* The echo character is set to '*', but may be changed by the current
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* Look and Feel. If the document model is
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* <code>null</code>, a default one will be created.
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*
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* @param doc the text storage to use
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* @param txt the text to be displayed, <code>null</code> if none
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* @param columns the number of columns to use to calculate
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* the preferred width >= 0; if columns is set to zero, the
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* preferred width will be whatever naturally results from
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* the component implementation
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*/
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public JPasswordField(Document doc, String txt, int columns) {
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super(doc, txt, columns);
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// We could either leave this on, which wouldn't be secure,
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// or obscure the composted text, which essentially makes displaying
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// it useless. Therefore, we turn off input methods.
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enableInputMethods(false);
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}
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/**
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* Returns the name of the L&F class that renders this component.
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*
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* @return the string "PasswordFieldUI"
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* @see JComponent#getUIClassID
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* @see UIDefaults#getUI
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*/
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public String getUIClassID() {
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return uiClassID;
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}
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/**
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* {@inheritDoc}
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* @since 1.6
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*/
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public void updateUI() {
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if(!echoCharSet) {
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echoChar = '*';
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}
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super.updateUI();
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}
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/**
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* Returns the character to be used for echoing. The default is '*'.
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* The default may be different depending on the currently running Look
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* and Feel. For example, Metal/Ocean's default is a bullet character.
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*
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* @return the echo character, 0 if unset
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* @see #setEchoChar
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* @see #echoCharIsSet
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*/
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public char getEchoChar() {
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return echoChar;
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}
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/**
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* Sets the echo character for this <code>JPasswordField</code>.
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* Note that this is largely a suggestion, since the
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* view that gets installed can use whatever graphic techniques
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* it desires to represent the field. Setting a value of 0 indicates
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* that you wish to see the text as it is typed, similar to
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* the behavior of a standard <code>JTextField</code>.
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*
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* @param c the echo character to display
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* @see #echoCharIsSet
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* @see #getEchoChar
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* @beaninfo
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* description: character to display in place of the real characters
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* attribute: visualUpdate true
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*/
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public void setEchoChar(char c) {
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echoChar = c;
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echoCharSet = true;
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repaint();
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revalidate();
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}
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/**
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* Returns true if this <code>JPasswordField</code> has a character
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* set for echoing. A character is considered to be set if the echo
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* character is not 0.
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*
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* @return true if a character is set for echoing
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* @see #setEchoChar
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* @see #getEchoChar
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*/
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public boolean echoCharIsSet() {
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return echoChar != 0;
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}
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// --- JTextComponent methods ----------------------------------
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/**
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* Invokes <code>provideErrorFeedback</code> on the current
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* look and feel, which typically initiates an error beep.
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* The normal behavior of transferring the
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* currently selected range in the associated text model
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* to the system clipboard, and removing the contents from
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* the model, is not acceptable for a password field.
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*/
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public void cut() {
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if (getClientProperty("JPasswordField.cutCopyAllowed") != Boolean.TRUE) {
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UIManager.getLookAndFeel().provideErrorFeedback(this);
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} else {
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super.cut();
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}
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}
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/**
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* Invokes <code>provideErrorFeedback</code> on the current
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* look and feel, which typically initiates an error beep.
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* The normal behavior of transferring the
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* currently selected range in the associated text model
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* to the system clipboard, and leaving the contents from
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* the model, is not acceptable for a password field.
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*/
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public void copy() {
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if (getClientProperty("JPasswordField.cutCopyAllowed") != Boolean.TRUE) {
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UIManager.getLookAndFeel().provideErrorFeedback(this);
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} else {
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super.copy();
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}
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}
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/**
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* Returns the text contained in this <code>TextComponent</code>.
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* If the underlying document is <code>null</code>, will give a
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* <code>NullPointerException</code>.
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* <p>
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* For security reasons, this method is deprecated. Use the
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<code>* getPassword</code> method instead.
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* @deprecated As of Java 2 platform v1.2,
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* replaced by <code>getPassword</code>.
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* @return the text
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*/
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@Deprecated
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public String getText() {
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return super.getText();
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}
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/**
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* Fetches a portion of the text represented by the
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* component. Returns an empty string if length is 0.
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* <p>
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* For security reasons, this method is deprecated. Use the
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* <code>getPassword</code> method instead.
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* @deprecated As of Java 2 platform v1.2,
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* replaced by <code>getPassword</code>.
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* @param offs the offset >= 0
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* @param len the length >= 0
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* @return the text
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* @exception BadLocationException if the offset or length are invalid
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*/
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@Deprecated
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public String getText(int offs, int len) throws BadLocationException {
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return super.getText(offs, len);
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}
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/**
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* Returns the text contained in this <code>TextComponent</code>.
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* If the underlying document is <code>null</code>, will give a
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* <code>NullPointerException</code>. For stronger
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* security, it is recommended that the returned character array be
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* cleared after use by setting each character to zero.
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*
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* @return the text
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*/
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public char[] getPassword() {
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Document doc = getDocument();
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Segment txt = new Segment();
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try {
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doc.getText(0, doc.getLength(), txt); // use the non-String API
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} catch (BadLocationException e) {
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return null;
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}
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char[] retValue = new char[txt.count];
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System.arraycopy(txt.array, txt.offset, retValue, 0, txt.count);
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return retValue;
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}
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/**
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* See readObject() and writeObject() in JComponent for more
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* information about serialization in Swing.
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*/
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private void writeObject(ObjectOutputStream s) throws IOException {
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s.defaultWriteObject();
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if (getUIClassID().equals(uiClassID)) {
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byte count = JComponent.getWriteObjCounter(this);
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JComponent.setWriteObjCounter(this, --count);
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if (count == 0 && ui != null) {
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ui.installUI(this);
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}
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}
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}
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// --- variables -----------------------------------------------
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/**
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* @see #getUIClassID
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* @see #readObject
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*/
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private static final String uiClassID = "PasswordFieldUI";
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private char echoChar;
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private boolean echoCharSet = false;
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/**
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* Returns a string representation of this <code>JPasswordField</code>.
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* This method is intended to be used only for debugging purposes, and the
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* content and format of the returned string may vary between
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* implementations. The returned string may be empty but may not
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* be <code>null</code>.
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*
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* @return a string representation of this <code>JPasswordField</code>
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*/
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protected String paramString() {
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return super.paramString() +
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",echoChar=" + echoChar;
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}
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/**
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* This method is a hack to get around the fact that we cannot
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* directly override setUIProperty because part of the inheritance hierarchy
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* goes outside of the javax.swing package, and therefore calling a package
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* private method isn't allowed. This method should return true if the property
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* was handled, and false otherwise.
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*/
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boolean customSetUIProperty(String propertyName, Object value) {
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if (propertyName == "echoChar") {
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if (!echoCharSet) {
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setEchoChar((Character)value);
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echoCharSet = false;
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}
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return true;
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}
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return false;
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}
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/////////////////
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// Accessibility support
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////////////////
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/**
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* Returns the <code>AccessibleContext</code> associated with this
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* <code>JPasswordField</code>. For password fields, the
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* <code>AccessibleContext</code> takes the form of an
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* <code>AccessibleJPasswordField</code>.
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* A new <code>AccessibleJPasswordField</code> instance is created
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* if necessary.
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*
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* @return an <code>AccessibleJPasswordField</code> that serves as the
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* <code>AccessibleContext</code> of this
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* <code>JPasswordField</code>
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*/
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public AccessibleContext getAccessibleContext() {
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if (accessibleContext == null) {
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accessibleContext = new AccessibleJPasswordField();
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}
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return accessibleContext;
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}
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/**
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* This class implements accessibility support for the
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* <code>JPasswordField</code> class. It provides an implementation of the
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* Java Accessibility API appropriate to password field user-interface
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* elements.
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* <p>
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* <strong>Warning:</strong>
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* Serialized objects of this class will not be compatible with
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* future Swing releases. The current serialization support is
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* appropriate for short term storage or RMI between applications running
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* the same version of Swing. As of 1.4, support for long term storage
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* of all JavaBeans™
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* has been added to the <code>java.beans</code> package.
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* Please see {@link java.beans.XMLEncoder}.
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*/
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protected class AccessibleJPasswordField extends AccessibleJTextField {
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/**
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* Gets the role of this object.
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*
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* @return an instance of AccessibleRole describing the role of the
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* object (AccessibleRole.PASSWORD_TEXT)
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* @see AccessibleRole
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*/
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public AccessibleRole getAccessibleRole() {
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return AccessibleRole.PASSWORD_TEXT;
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}
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/**
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* Gets the <code>AccessibleText</code> for the <code>JPasswordField</code>.
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* The returned object also implements the
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* <code>AccessibleExtendedText</code> interface.
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*
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* @return <code>AccessibleText</code> for the JPasswordField
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* @see javax.accessibility.AccessibleContext
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* @see javax.accessibility.AccessibleContext#getAccessibleText
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* @see javax.accessibility.AccessibleText
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* @see javax.accessibility.AccessibleExtendedText
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*
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* @since 1.6
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*/
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public AccessibleText getAccessibleText() {
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return this;
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}
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/*
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* Returns a String filled with password echo characters. The String
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* contains one echo character for each character (including whitespace)
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* that the user entered in the JPasswordField.
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*/
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private String getEchoString(String str) {
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if (str == null) {
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return null;
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}
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char[] buffer = new char[str.length()];
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Arrays.fill(buffer, getEchoChar());
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return new String(buffer);
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}
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/**
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* Returns the <code>String</code> at a given <code>index</code>.
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*
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* @param part the <code>CHARACTER</code>, <code>WORD</code> or
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* <code>SENTENCE</code> to retrieve
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* @param index an index within the text
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* @return a <code>String</code> if <code>part</code> and
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* <code>index</code> are valid.
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* Otherwise, <code>null</code> is returned
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*
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* @see javax.accessibility.AccessibleText#CHARACTER
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* @see javax.accessibility.AccessibleText#WORD
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* @see javax.accessibility.AccessibleText#SENTENCE
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*
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* @since 1.6
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*/
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public String getAtIndex(int part, int index) {
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String str = null;
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if (part == AccessibleText.CHARACTER) {
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str = super.getAtIndex(part, index);
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} else {
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// Treat the text displayed in the JPasswordField
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// as one word and sentence.
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char password[] = getPassword();
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if (password == null ||
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index < 0 || index >= password.length) {
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return null;
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}
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str = new String(password);
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}
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return getEchoString(str);
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}
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/**
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* Returns the <code>String</code> after a given <code>index</code>.
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*
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* @param part the <code>CHARACTER</code>, <code>WORD</code> or
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* <code>SENTENCE</code> to retrieve
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* @param index an index within the text
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* @return a <code>String</code> if <code>part</code> and
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* <code>index</code> are valid.
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* Otherwise, <code>null</code> is returned
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*
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* @see javax.accessibility.AccessibleText#CHARACTER
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* @see javax.accessibility.AccessibleText#WORD
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* @see javax.accessibility.AccessibleText#SENTENCE
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*
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* @since 1.6
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*/
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public String getAfterIndex(int part, int index) {
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if (part == AccessibleText.CHARACTER) {
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String str = super.getAfterIndex(part, index);
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return getEchoString(str);
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} else {
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// There is no word or sentence after the text
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// displayed in the JPasswordField.
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return null;
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}
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}
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/**
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* Returns the <code>String</code> before a given <code>index</code>.
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*
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* @param part the <code>CHARACTER</code>, <code>WORD</code> or
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* <code>SENTENCE</code> to retrieve
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* @param index an index within the text
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* @return a <code>String</code> if <code>part</code> and
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* <code>index</code> are valid.
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* Otherwise, <code>null</code> is returned
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*
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* @see javax.accessibility.AccessibleText#CHARACTER
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* @see javax.accessibility.AccessibleText#WORD
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* @see javax.accessibility.AccessibleText#SENTENCE
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*
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* @since 1.6
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*/
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public String getBeforeIndex(int part, int index) {
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if (part == AccessibleText.CHARACTER) {
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String str = super.getBeforeIndex(part, index);
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return getEchoString(str);
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} else {
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// There is no word or sentence before the text
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// displayed in the JPasswordField.
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return null;
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}
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}
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|
/**
|
|
* Returns the text between two <code>indices</code>.
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*
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* @param startIndex the start index in the text
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* @param endIndex the end index in the text
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* @return the text string if the indices are valid.
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* Otherwise, <code>null</code> is returned
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*
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* @since 1.6
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*/
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public String getTextRange(int startIndex, int endIndex) {
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String str = super.getTextRange(startIndex, endIndex);
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return getEchoString(str);
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}
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|
|
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/**
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|
* Returns the <code>AccessibleTextSequence</code> at a given
|
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* <code>index</code>.
|
|
*
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|
* @param part the <code>CHARACTER</code>, <code>WORD</code>,
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|
* <code>SENTENCE</code>, <code>LINE</code> or <code>ATTRIBUTE_RUN</code> to
|
|
* retrieve
|
|
* @param index an index within the text
|
|
* @return an <code>AccessibleTextSequence</code> specifying the text if
|
|
* <code>part</code> and <code>index</code> are valid. Otherwise,
|
|
* <code>null</code> is returned
|
|
*
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|
* @see javax.accessibility.AccessibleText#CHARACTER
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* @see javax.accessibility.AccessibleText#WORD
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* @see javax.accessibility.AccessibleText#SENTENCE
|
|
* @see javax.accessibility.AccessibleExtendedText#LINE
|
|
* @see javax.accessibility.AccessibleExtendedText#ATTRIBUTE_RUN
|
|
*
|
|
* @since 1.6
|
|
*/
|
|
public AccessibleTextSequence getTextSequenceAt(int part, int index) {
|
|
if (part == AccessibleText.CHARACTER) {
|
|
AccessibleTextSequence seq = super.getTextSequenceAt(part, index);
|
|
if (seq == null) {
|
|
return null;
|
|
}
|
|
return new AccessibleTextSequence(seq.startIndex, seq.endIndex,
|
|
getEchoString(seq.text));
|
|
} else {
|
|
// Treat the text displayed in the JPasswordField
|
|
// as one word, sentence, line and attribute run
|
|
char password[] = getPassword();
|
|
if (password == null ||
|
|
index < 0 || index >= password.length) {
|
|
return null;
|
|
}
|
|
String text = new String(password);
|
|
return new AccessibleTextSequence(0, password.length - 1,
|
|
getEchoString(text));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the <code>AccessibleTextSequence</code> after a given
|
|
* <code>index</code>.
|
|
*
|
|
* @param part the <code>CHARACTER</code>, <code>WORD</code>,
|
|
* <code>SENTENCE</code>, <code>LINE</code> or <code>ATTRIBUTE_RUN</code> to
|
|
* retrieve
|
|
* @param index an index within the text
|
|
* @return an <code>AccessibleTextSequence</code> specifying the text if
|
|
* <code>part</code> and <code>index</code> are valid. Otherwise,
|
|
* <code>null</code> is returned
|
|
*
|
|
* @see javax.accessibility.AccessibleText#CHARACTER
|
|
* @see javax.accessibility.AccessibleText#WORD
|
|
* @see javax.accessibility.AccessibleText#SENTENCE
|
|
* @see javax.accessibility.AccessibleExtendedText#LINE
|
|
* @see javax.accessibility.AccessibleExtendedText#ATTRIBUTE_RUN
|
|
*
|
|
* @since 1.6
|
|
*/
|
|
public AccessibleTextSequence getTextSequenceAfter(int part, int index) {
|
|
if (part == AccessibleText.CHARACTER) {
|
|
AccessibleTextSequence seq = super.getTextSequenceAfter(part, index);
|
|
if (seq == null) {
|
|
return null;
|
|
}
|
|
return new AccessibleTextSequence(seq.startIndex, seq.endIndex,
|
|
getEchoString(seq.text));
|
|
} else {
|
|
// There is no word, sentence, line or attribute run
|
|
// after the text displayed in the JPasswordField.
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the <code>AccessibleTextSequence</code> before a given
|
|
* <code>index</code>.
|
|
*
|
|
* @param part the <code>CHARACTER</code>, <code>WORD</code>,
|
|
* <code>SENTENCE</code>, <code>LINE</code> or <code>ATTRIBUTE_RUN</code> to
|
|
* retrieve
|
|
* @param index an index within the text
|
|
* @return an <code>AccessibleTextSequence</code> specifying the text if
|
|
* <code>part</code> and <code>index</code> are valid. Otherwise,
|
|
* <code>null</code> is returned
|
|
*
|
|
* @see javax.accessibility.AccessibleText#CHARACTER
|
|
* @see javax.accessibility.AccessibleText#WORD
|
|
* @see javax.accessibility.AccessibleText#SENTENCE
|
|
* @see javax.accessibility.AccessibleExtendedText#LINE
|
|
* @see javax.accessibility.AccessibleExtendedText#ATTRIBUTE_RUN
|
|
*
|
|
* @since 1.6
|
|
*/
|
|
public AccessibleTextSequence getTextSequenceBefore(int part, int index) {
|
|
if (part == AccessibleText.CHARACTER) {
|
|
AccessibleTextSequence seq = super.getTextSequenceBefore(part, index);
|
|
if (seq == null) {
|
|
return null;
|
|
}
|
|
return new AccessibleTextSequence(seq.startIndex, seq.endIndex,
|
|
getEchoString(seq.text));
|
|
} else {
|
|
// There is no word, sentence, line or attribute run
|
|
// before the text displayed in the JPasswordField.
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
}
|