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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
 * .
 */

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 not modify
 * the contents of the XMLString structure.
 * 

* The contents of the string are managed by the string buffer. As * characters are appended, the string buffer will grow as needed. *

* Note: Never set the ch, * offset, and length fields directly. * These fields are managed by the string buffer. In order to reset * the buffer, call clear(). * * @author Andy Clark, IBM * @author Eric Ye, IBM */ public class XMLStringBuffer extends XMLString { // // Constants // /** Default buffer size (32). */ private static final int DEFAULT_SIZE = 32; // // Constructors // /** * */ public XMLStringBuffer() { this(DEFAULT_SIZE); } // () /** * * * @param size */ public XMLStringBuffer(int size) { ch = new char[size]; } // (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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