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153 lines
3.6 KiB
153 lines
3.6 KiB
/*
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* Copyright (c) 2000, 2004, 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.print.attribute;
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import java.io.Serializable;
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import java.util.Locale;
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/**
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* Class TextSyntax is an abstract base class providing the common
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* implementation of all attributes whose value is a string. The text attribute
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* includes a locale to indicate the natural language. Thus, a text attribute
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* always represents a localized string. Once constructed, a text attribute's
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* value is immutable.
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* <P>
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*
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* @author David Mendenhall
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* @author Alan Kaminsky
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*/
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public abstract class TextSyntax implements Serializable, Cloneable {
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private static final long serialVersionUID = -8130648736378144102L;
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/**
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* String value of this text attribute.
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* @serial
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*/
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private String value;
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/**
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* Locale of this text attribute.
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* @serial
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*/
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private Locale locale;
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/**
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* Constructs a TextAttribute with the specified string and locale.
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*
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* @param value Text string.
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* @param locale Natural language of the text string. null
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* is interpreted to mean the default locale for as returned
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* by <code>Locale.getDefault()</code>
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <CODE>value</CODE> is null.
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*/
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protected TextSyntax(String value, Locale locale) {
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this.value = verify (value);
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this.locale = verify (locale);
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}
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private static String verify(String value) {
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if (value == null) {
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throw new NullPointerException(" value is null");
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}
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return value;
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}
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private static Locale verify(Locale locale) {
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if (locale == null) {
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return Locale.getDefault();
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}
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return locale;
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}
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/**
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* Returns this text attribute's text string.
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* @return the text string.
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*/
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public String getValue() {
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return value;
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}
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/**
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* Returns this text attribute's text string's natural language (locale).
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* @return the locale
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*/
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public Locale getLocale() {
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return locale;
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}
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/**
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* Returns a hashcode for this text attribute.
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*
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* @return A hashcode value for this object.
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*/
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public int hashCode() {
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return value.hashCode() ^ locale.hashCode();
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}
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/**
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* Returns whether this text attribute is equivalent to the passed in
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* object. To be equivalent, all of the following conditions must be true:
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* <OL TYPE=1>
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* <LI>
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* <CODE>object</CODE> is not null.
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* <LI>
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* <CODE>object</CODE> is an instance of class TextSyntax.
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* <LI>
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* This text attribute's underlying string and <CODE>object</CODE>'s
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* underlying string are equal.
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* <LI>
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* This text attribute's locale and <CODE>object</CODE>'s locale are
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* equal.
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* </OL>
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*
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* @param object Object to compare to.
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*
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* @return True if <CODE>object</CODE> is equivalent to this text
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* attribute, false otherwise.
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*/
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public boolean equals(Object object) {
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return(object != null &&
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object instanceof TextSyntax &&
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this.value.equals (((TextSyntax) object).value) &&
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this.locale.equals (((TextSyntax) object).locale));
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}
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/**
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* Returns a String identifying this text attribute. The String is
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* the attribute's underlying text string.
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*
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* @return A String identifying this object.
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*/
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public String toString(){
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return value;
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}
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}
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