/*
* © Copyright IBM Corp. 2012-2013
*
* Licensed 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 com.ibm.commons.util.io;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* This class is simply a wrapper to an original stream that traces the bytes read.
* <p>
* It is useful to display each byte that is read from an InputStream without
* consuming them.
* </p>
* @ibm-api
*/
public class TraceInputStream extends InputStream {
/**
* @ibm-api
*/
public TraceInputStream(InputStream inputStream, OutputStream trace, boolean close) {
this.inputStream=inputStream;
this.trace=trace;
this.close=close;
}
/**
* @ibm-api
*/
public void close() throws java.io.IOException {
inputStream.close();
if( close ) {
trace.close();
} else {
trace.flush();
}
}
/**
* @ibm-api
*/
public int read() throws IOException {
int b = inputStream.read();
if( b>=0 ) {
trace.write(b);
//trace.flush();
}
return b;
}
/**
* @ibm-api
*/
public int read(byte b[], int off, int len) throws IOException {
int r = inputStream.read( b, off, len );
if( r>0 ) {
trace.write(b,off,r);
//trace.flush();
}
return r;
}
private InputStream inputStream;
private OutputStream trace;
private boolean close;
}