001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. 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 */ 017package org.apache.camel.converter.stream; 018 019import java.io.ByteArrayInputStream; 020import java.io.ByteArrayOutputStream; 021import java.io.FilterInputStream; 022import java.io.IOException; 023import java.io.OutputStream; 024 025import org.apache.camel.Exchange; 026import org.apache.camel.StreamCache; 027import org.apache.camel.util.IOHelper; 028 029/** 030 * A {@link StreamCache} for {@link java.io.ByteArrayInputStream} 031 */ 032public class ByteArrayInputStreamCache extends FilterInputStream implements StreamCache { 033 034 private final int length; 035 private byte[] byteArrayForCopy; 036 037 public ByteArrayInputStreamCache(ByteArrayInputStream in) { 038 super(in); 039 this.length = in.available(); 040 } 041 042 @Override 043 public void reset() { 044 try { 045 super.reset(); 046 } catch (IOException e) { 047 // ignore 048 } 049 } 050 051 public void writeTo(OutputStream os) throws IOException { 052 IOHelper.copyAndCloseInput(in, os); 053 } 054 055 public StreamCache copy(Exchange exchange) throws IOException { 056 if (byteArrayForCopy == null) { 057 ByteArrayOutputStream baos = new ByteArrayOutputStream(in.available()); 058 IOHelper.copy(in, baos); 059 // reset so that the stream can be reused 060 reset(); 061 // cache the byte array, in order not to copy the byte array in the next call again 062 byteArrayForCopy = baos.toByteArray(); 063 } 064 return new InputStreamCache(byteArrayForCopy); 065 } 066 067 public boolean inMemory() { 068 return true; 069 } 070 071 @Override 072 public long length() { 073 return length; 074 } 075}