001 /**
002 *
003 * Copyright 2004 Hiram Chirino
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 *
017 **/
018 package org.activemq.util;
019
020 import java.io.ByteArrayOutputStream;
021 import java.io.FilterOutputStream;
022 import java.io.OutputStream;
023 import java.lang.reflect.Method;
024
025 /**
026 * This provides OutputStream that delegates to com.sleepycat.util.FastOutputStream
027 * if it is available and if it is not it delegates to java.io.ByteArrayOutputStream.
028 *
029 * This class allows ActiveMQ to not be dependent on the bdb lib. It might
030 * be worth it to just fully implement a FastOutputStream ourselfs. I think
031 * it's just a ByteArrayOutputStream what is not thread safe.
032 *
033 * @version $Revision: 1.1.1.1 $
034 */
035 public class FastOutputStream extends FilterOutputStream {
036
037 public FastOutputStream() {
038 super(createOutputStream());
039 }
040 private static OutputStream createOutputStream() {
041 try {
042 Class c = FastOutputStream.class.getClassLoader().loadClass("com.sleepycat.util.FastOutputStream");
043 return (OutputStream) c.newInstance();
044 } catch (Throwable e) {
045 return new ByteArrayOutputStream();
046 }
047 }
048
049 public byte[] toByteArray() {
050 if( out instanceof ByteArrayOutputStream ) {
051 return ((ByteArrayOutputStream)out).toByteArray();
052 }
053 try {
054 Method method = out.getClass().getMethod("toByteArray",new Class[]{});
055 return (byte[]) method.invoke(out, new Object[]{});
056 } catch (Throwable e) {
057 throw new RuntimeException("Could not invoke toByteArray() method on "+out.getClass(), e);
058 }
059 }
060 }