/*
* © 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.Writer;
/**
* This class is simply a wrapper to an original stream that traces the characters written.
* <p>
* It is useful to display each byte that is written to a Writer without
* consuming them.
* </p>
* @ibm-api
*/
public class TraceWriter extends Writer {
/**
* @ibm-api
*/
public TraceWriter(Writer writer, Writer trace) {
this.writer=writer;
this.trace=trace;
}
/**
* @ibm-api
*/
public void close() throws java.io.IOException {
writer.close();
trace.flush();
// Don't close the trace writer, as it may be still used outside
}
/**
* @ibm-api
*/
public void write(char cbuf[], int off, int len) throws IOException {
writer.write(cbuf,off,len);
trace.write(cbuf,off,len);
trace.flush();
}
/**
* @ibm-api
*/
public void flush() throws java.io.IOException {
writer.flush();
trace.flush();
}
private Writer writer;
private Writer trace;
}