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.StreamCache; 026import org.apache.camel.util.IOHelper; 027 028/** 029 * A {@link StreamCache} for {@link java.io.ByteArrayInputStream} 030 */ 031public class ByteArrayInputStreamCache extends FilterInputStream implements StreamCache { 032 033 private final int length; 034 private byte[] byteArrayForCopy; 035 036 public ByteArrayInputStreamCache(ByteArrayInputStream in) { 037 super(in); 038 this.length = in.available(); 039 } 040 041 @Override 042 public void reset() { 043 try { 044 super.reset(); 045 } catch (IOException e) { 046 // ignore 047 } 048 } 049 050 public void writeTo(OutputStream os) throws IOException { 051 IOHelper.copyAndCloseInput(in, os); 052 } 053 054 public StreamCache copy() throws IOException { 055 if (byteArrayForCopy == null) { 056 ByteArrayOutputStream baos = new ByteArrayOutputStream(in.available()); 057 IOHelper.copy(in, baos); 058 // reset so that the stream can be reused 059 reset(); 060 // cache the byte array, in order not to copy the byte array in the next call again 061 byteArrayForCopy = baos.toByteArray(); 062 } 063 return new InputStreamCache(byteArrayForCopy); 064 } 065 066 public boolean inMemory() { 067 return true; 068 } 069 070 @Override 071 public long length() { 072 return length; 073 } 074}