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231 lines
7.2 KiB
231 lines
7.2 KiB
/*
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* Copyright (c) 2007, 2018, 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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* The Apache Software License, Version 1.1
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*
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*
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* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Xerces" and "Apache Software Foundation" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* nor may "Apache" appear in their name, without prior written
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* permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation and was
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* originally based on software copyright (c) 1999, International
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* Business Machines, Inc., http://www.apache.org. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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package com.sun.org.apache.xerces.internal.util;
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import com.sun.org.apache.xerces.internal.xni.XMLString;
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/**
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* XMLString is a structure used to pass character arrays. However,
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* XMLStringBuffer is a buffer in which characters can be appended
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* and extends XMLString so that it can be passed to methods
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* expecting an XMLString object. This is a safe operation because
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* it is assumed that any callee will <strong>not</strong> modify
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* the contents of the XMLString structure.
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* <p>
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* The contents of the string are managed by the string buffer. As
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* characters are appended, the string buffer will grow as needed.
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* <p>
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* <strong>Note:</strong> Never set the <code>ch</code>,
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* <code>offset</code>, and <code>length</code> fields directly.
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* These fields are managed by the string buffer. In order to reset
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* the buffer, call <code>clear()</code>.
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*
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* @author Andy Clark, IBM
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* @author Eric Ye, IBM
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*
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*/
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public class XMLStringBuffer
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extends XMLString {
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//
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// Constants
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//
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/** Default buffer size (32). */
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public static final int DEFAULT_SIZE = 32;
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//
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// Data
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//
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//
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// Constructors
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//
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/**
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*
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*/
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public XMLStringBuffer() {
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this(DEFAULT_SIZE);
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} // <init>()
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/**
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*
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*
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* @param size
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*/
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public XMLStringBuffer(int size) {
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ch = new char[size];
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} // <init>(int)
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/** Constructs a string buffer from a char. */
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public XMLStringBuffer(char c) {
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this(1);
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append(c);
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} // <init>(char)
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/** Constructs a string buffer from a String. */
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public XMLStringBuffer(String s) {
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this(s.length());
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append(s);
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} // <init>(String)
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/** Constructs a string buffer from the specified character array. */
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public XMLStringBuffer(char[] ch, int offset, int length) {
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this(length);
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append(ch, offset, length);
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} // <init>(char[],int,int)
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/** Constructs a string buffer from the specified XMLString. */
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public XMLStringBuffer(XMLString s) {
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this(s.length);
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append(s);
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} // <init>(XMLString)
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//
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// Public methods
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//
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/** Clears the string buffer. */
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public void clear() {
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offset = 0;
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length = 0;
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}
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/**
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* append
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*
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* @param c
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*/
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public void append(char c) {
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if(this.length + 1 > this.ch.length){
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int newLength = this.ch.length * 2 ;
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if(newLength < this.ch.length + DEFAULT_SIZE){
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newLength = this.ch.length + DEFAULT_SIZE;
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}
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char [] tmp = new char[newLength];
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System.arraycopy(this.ch, 0, tmp, 0, this.length);
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this.ch = tmp;
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}
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this.ch[this.length] = c ;
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this.length++;
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} // append(char)
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/**
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* append
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*
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* @param s
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*/
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public void append(String s) {
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int length = s.length();
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if (this.length + length > this.ch.length) {
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int newLength = this.ch.length * 2 ;
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if(newLength < this.ch.length + length + DEFAULT_SIZE){
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newLength = this.ch.length + length+ DEFAULT_SIZE;
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}
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char[] newch = new char[newLength];
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System.arraycopy(this.ch, 0, newch, 0, this.length);
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this.ch = newch;
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}
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s.getChars(0, length, this.ch, this.length);
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this.length += length;
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} // append(String)
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/**
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* append
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*
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* @param ch
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* @param offset
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* @param length
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*/
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public void append(char[] ch, int offset, int length) {
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if (this.length + length > this.ch.length) {
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int newLength = this.ch.length * 2 ;
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if(newLength < this.ch.length + length + DEFAULT_SIZE){
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newLength = this.ch.length + length + DEFAULT_SIZE;
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}
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char[] newch = new char[newLength];
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System.arraycopy(this.ch, 0, newch, 0, this.length);
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this.ch = newch;
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}
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//making the code more robust as it would handle null or 0 length data,
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//add the data only when it contains some thing
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if(ch != null && length > 0){
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System.arraycopy(ch, offset, this.ch, this.length, length);
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this.length += length;
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}
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} // append(char[],int,int)
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/**
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* append
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*
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* @param s
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*/
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public void append(XMLString s) {
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append(s.ch, s.offset, s.length);
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} // append(XMLString)
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} // class XMLStringBuffer
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