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Struts example source code file (XMLStringBuffer.java)

This example Struts source code file (XMLStringBuffer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

default_size, default_size, xmlstring, xmlstring, xmlstringbuffer, xmlstringbuffer

The Struts XMLStringBuffer.java source code

/*
 * 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.struts2.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 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: Never set the ch, 
 * <code>offset, and length fields directly.
 * These fields are managed by the string buffer. In order to reset
 * the buffer, call <code>clear().
 * 
 * @author Andy Clark, IBM
 * @author Eric Ye, IBM
 *
 * @version $Id: XMLStringBuffer.java 467222 2006-10-24 03:17:11Z 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)

    /** Constructs a string buffer from a char. */
    public XMLStringBuffer(char c) {
        this(1);
        append(c);
    } // <init>(char)

    /** Constructs a string buffer from a String. */
    public XMLStringBuffer(String s) {
        this(s.length());
        append(s);
    } // <init>(String)

    /** Constructs a string buffer from the specified character array. */
    public XMLStringBuffer(char[] ch, int offset, int length) {
        this(length);
        append(ch, offset, length);
    } // <init>(char[],int,int)

    /** Constructs a string buffer from the specified XMLString. */
    public XMLStringBuffer(XMLString s) {
        this(s.length);
        append(s);
    } // <init>(XMLString)

    //
    // Public methods
    //

    /** Clears the string buffer. */
    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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