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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.jasper.xmlparser;
/**
* XMLString is a structure used to pass character arrays. However,
* XMLStringBuffer is a buffer in which characters can be appended
* and extends XMLString so that it can be passed to methods
* expecting an XMLString object. This is a safe operation because
* it is assumed that any callee will <strong>not</strong> modify
* the contents of the XMLString structure.
* <p>
* The contents of the string are managed by the string buffer. As
* characters are appended, the string buffer will grow as needed.
* <p>
* <strong>Note:</strong> Never set the <code>ch</code>,
* <code>offset</code>, and <code>length</code> fields directly.
* These fields are managed by the string buffer. In order to reset
* the buffer, call <code>clear()</code>.
*
* @author Andy Clark, IBM
* @author Eric Ye, IBM
*
* @version $Id: XMLStringBuffer.java 1081765 2011-03-15 13:10:33Z markt $
*/
public class XMLStringBuffer
extends XMLString {
//
// Constants
//
/** Default buffer size (32). */
public static final int DEFAULT_SIZE = 32;
//
// Constructors
//
/**
*
*/
public XMLStringBuffer() {
this(DEFAULT_SIZE);
} // <init>()
/**
*
*
* @param size
*/
public XMLStringBuffer(int size) {
ch = new char[size];
} // <init>(int)
//
// Public methods
//
/** Clears the string buffer. */
@Override
public void clear() {
offset = 0;
length = 0;
}
/**
* append
*
* @param c
*/
public void append(char c) {
if (this.length + 1 > this.ch.length) {
int newLength = this.ch.length*2;
if (newLength < this.ch.length + DEFAULT_SIZE)
newLength = this.ch.length + DEFAULT_SIZE;
char[] newch = new char[newLength];
System.arraycopy(this.ch, 0, newch, 0, this.length);
this.ch = newch;
}
this.ch[this.length] = c;
this.length++;
} // append(char)
/**
* append
*
* @param s
*/
public void append(String s) {
int length = s.length();
if (this.length + length > this.ch.length) {
int newLength = this.ch.length*2;
if (newLength < this.length + length + DEFAULT_SIZE)
newLength = this.ch.length + length + DEFAULT_SIZE;
char[] newch = new char[newLength];
System.arraycopy(this.ch, 0, newch, 0, this.length);
this.ch = newch;
}
s.getChars(0, length, this.ch, this.length);
this.length += length;
} // append(String)
/**
* append
*
* @param ch
* @param offset
* @param length
*/
public void append(char[] ch, int offset, int length) {
if (this.length + length > this.ch.length) {
char[] newch = new char[this.ch.length + length + DEFAULT_SIZE];
System.arraycopy(this.ch, 0, newch, 0, this.length);
this.ch = newch;
}
System.arraycopy(ch, offset, this.ch, this.length, length);
this.length += length;
} // append(char[],int,int)
/**
* append
*
* @param s
*/
public void append(XMLString s) {
append(s.ch, s.offset, s.length);
} // append(XMLString)
} // class XMLStringBuffer
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