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    1   /**
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    * Unless required by applicable law or agreed to in writing, software
   12    * distributed under the License is distributed on an "AS IS" BASIS,
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    * See the License for the specific language governing permissions and
   15    * limitations under the License.
   16    */
   17   package org.apache.kahadb.util;
   18   
   19   import java.io.OutputStream;
   20   
   21   
   22   /**
   23    * Very similar to the java.io.ByteArrayOutputStream but this version 
   24    * is not thread safe and the resulting data is returned in a ByteSequence
   25    * to avoid an extra byte[] allocation.
   26    */
   27   public class ByteArrayOutputStream extends OutputStream {
   28   
   29       byte buffer[];
   30       int size;
   31   
   32       public ByteArrayOutputStream() {
   33           this(1028);
   34       }
   35       public ByteArrayOutputStream(int capacity) {
   36           buffer = new byte[capacity];
   37       }
   38   
   39       public void write(int b) {
   40           int newsize = size + 1;
   41           checkCapacity(newsize);
   42           buffer[size] = (byte) b;
   43           size = newsize;
   44       }
   45   
   46       public void write(byte b[], int off, int len) {
   47           int newsize = size + len;
   48           checkCapacity(newsize);
   49           System.arraycopy(b, off, buffer, size, len);
   50           size = newsize;
   51       }
   52       
   53       /**
   54        * Ensures the the buffer has at least the minimumCapacity specified. 
   55        * @param i
   56        */
   57       private void checkCapacity(int minimumCapacity) {
   58           if (minimumCapacity > buffer.length) {
   59               byte b[] = new byte[Math.max(buffer.length << 1, minimumCapacity)];
   60               System.arraycopy(buffer, 0, b, 0, size);
   61               buffer = b;
   62           }
   63       }
   64   
   65       public void reset() {
   66           size = 0;
   67       }
   68   
   69       public ByteSequence toByteSequence() {
   70           return new ByteSequence(buffer, 0, size);
   71       }
   72       
   73       public byte[] toByteArray() {
   74           byte rc[] = new byte[size];
   75           System.arraycopy(buffer, 0, rc, 0, size);
   76           return rc;
   77       }
   78       
   79       public int size() {
   80           return size;
   81       }
   82   }

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