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 org.apache.activemq.util;
  
  import java.io.OutputStream;
  
  
  /**
   * Very similar to the java.io.ByteArrayOutputStream but this version 
   * is not thread safe and the resulting data is returned in a ByteSequence
   * to avoid an extra byte[] allocation.
   */
  public class ByteArrayOutputStream extends OutputStream {
  
      byte buffer[];
      int size;
  
      public ByteArrayOutputStream() {
          this(1028);
      }
      public ByteArrayOutputStream(int capacity) {
          buffer = new byte[capacity];
      }
  
      public void write(int b) {
          int newsize = size + 1;
          checkCapacity(newsize);
          buffer[size] = (byte) b;
          size = newsize;
      }
  
      public void write(byte b[], int off, int len) {
          int newsize = size + len;
          checkCapacity(newsize);
          System.arraycopy(b, off, buffer, size, len);
          size = newsize;
      }
      
      /**
       * Ensures the the buffer has at least the minimumCapacity specified. 
       * @param minimumCapacity
       */
      private void checkCapacity(int minimumCapacity) {
          if (minimumCapacity > buffer.length) {
              byte b[] = new byte[Math.max(buffer.length << 1, minimumCapacity)];
              System.arraycopy(buffer, 0, b, 0, size);
              buffer = b;
          }
      }
  
      public void reset() {
          size = 0;
      }
  
      public ByteSequence toByteSequence() {
          return new ByteSequence(buffer, 0, size);
      }
      
      public byte[] toByteArray() {
          byte rc[] = new byte[size];
          System.arraycopy(buffer, 0, rc, 0, size);
          return rc;
      }
      
      public int size() {
          return size;
      }
  
      public boolean endsWith(final byte[] array) {
          int i = 0;
          int start = size - array.length;
          if (start < 0) {
              return false;
          }
          while (start < size) {
              if (buffer[start++] != array[i++]) {
                  return false;
              }
          }
          return true;
      }
  }
  