content: /*
   * 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.
   */
  
  package mf.org.apache.xerces.util;
  
  import mf.org.apache.xerces.xni.XMLString;
  
  /**
   * 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 447241 2006-09-18 05:12:57Z mrglavas $
   */
  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.
       */
      @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
  