/*

  * 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 org.apache.myfaces.shared.util;

 import java.io.IOException;

 import java.io.Writer;

 /**

  * StringWriter cannot be reused without create a new object over and over.

  * This class provide a simple implementation that allows reuse the same buffer

  * in a efficient way.

  *

  * @author Jacob Hookom

  */

 public final class FastWriter extends Writer

 {

     private char[] buff;

     private int size;

     public FastWriter()

     {

         this(1024);

     }

     public FastWriter(int initialSize)

     {

         if (initialSize < 0)

         {

             throw new IllegalArgumentException("Initial Size cannot be less than 0");

         }

         this.buff = new char[initialSize];

     }

     public void close() throws IOException

     {

         // do nothing

     }

     public void flush() throws IOException

     {

         // do nothing

     }

     private final void overflow(int len)

     {

         if (this.size + len > this.buff.length)

         {

             char[] next = new char[(this.size + len) * 2];

             System.arraycopy(this.buff, 0, next, 0, this.size);

             this.buff = next;

         }

     }

     public void write(char[] cbuf, int off, int len) throws IOException

     {

         overflow(len);

         System.arraycopy(cbuf, off, this.buff, this.size, len);

         this.size += len;

     }

     public void write(char[] cbuf) throws IOException

     {

         this.write(cbuf, 0, cbuf.length);

     }

     public void write(int c) throws IOException

     {

         this.overflow(1);

         this.buff[this.size] = (char) c;

         this.size++;

     }

     public void write(String str, int off, int len) throws IOException

     {

         overflow(len);

         str.getChars(off, off+len, this.buff, size);

         this.size += len;

     }

     public void write(String str) throws IOException

     {

         this.write(str, 0, str.length());

     }

     public void reset()

     {

         this.size = 0;

     }

     public String toString()

     {

         return new String(this.buff, 0, this.size);

     }

 }