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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.tools.ant.util;
import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.Task;
/**
* Special <code>PipedInputStream</code> that will not die
* when the writing <code>Thread</code> is no longer alive.
* @since Ant 1.6.2
*/
public class LeadPipeInputStream extends PipedInputStream {
private static final int BYTE_MASK = 0xFF;
private ProjectComponent managingPc;
/**
* Construct a new <code>LeadPipeInputStream</code>.
*/
public LeadPipeInputStream() {
super();
}
/**
* Construct a new <code>LeadPipeInputStream</code>
* with the specified buffer size.
* @param size the size of the circular buffer.
*/
public LeadPipeInputStream(int size) {
super();
setBufferSize(size);
}
/**
* Construct a new <code>LeadPipeInputStream</code> to pull
* from the specified <code>PipedOutputStream</code>.
* @param src the <code>PipedOutputStream</code> source.
* @throws IOException if unable to construct the stream.
*/
public LeadPipeInputStream(PipedOutputStream src) throws IOException {
super(src);
}
/**
* Construct a new <code>LeadPipeInputStream</code> to pull
* from the specified <code>PipedOutputStream</code>, using a
* circular buffer of the specified size.
* @param src the <code>PipedOutputStream</code> source.
* @param size the size of the circular buffer.
* @throws IOException if there is an error.
*/
public LeadPipeInputStream(PipedOutputStream src, int size) throws IOException {
super(src);
setBufferSize(size);
}
//inherit doc
/**
* Read a byte from the stream.
* @return the byte (0 to 255) or -1 if there are no more.
* @throws IOException if there is an error.
*/
public synchronized int read() throws IOException {
int result = -1;
try {
result = super.read();
} catch (IOException eyeOhEx) {
String msg = eyeOhEx.getMessage();
if ("write end dead".equalsIgnoreCase(msg)
|| "pipe broken".equalsIgnoreCase(msg)) {
if (super.in > 0 && super.out < super.buffer.length
&& super.out > super.in) {
result = super.buffer[super.out++] & BYTE_MASK;
}
} else {
log("error at LeadPipeInputStream.read(): " + msg,
Project.MSG_INFO);
}
}
return result;
}
/**
* Set the size of the buffer.
* @param size the new buffer size. Ignored if <= current size.
*/
public synchronized void setBufferSize(int size) {
if (size > buffer.length) {
byte[] newBuffer = new byte[size];
if (in >= 0) {
if (in > out) {
System.arraycopy(buffer, out, newBuffer, out, in - out);
} else {
int outlen = buffer.length - out;
System.arraycopy(buffer, out, newBuffer, 0, outlen);
System.arraycopy(buffer, 0, newBuffer, outlen, in);
in += outlen;
out = 0;
}
}
buffer = newBuffer;
}
}
/**
* Set a managing <code>Task</code> for
* this <code>LeadPipeInputStream</code>.
* @param task the managing <code>Task</code>.
*/
public void setManagingTask(Task task) {
setManagingComponent(task);
}
/**
* Set a managing <code>ProjectComponent</code> for
* this <code>LeadPipeInputStream</code>.
* @param pc the managing <code>ProjectComponent</code>.
*/
public void setManagingComponent(ProjectComponent pc) {
this.managingPc = pc;
}
/**
* Log a message with the specified logging level.
* @param message the <code>String</code> message.
* @param loglevel the <code>int</code> logging level.
*/
public void log(String message, int loglevel) {
if (managingPc != null) {
managingPc.log(message, loglevel);
} else {
if (loglevel > Project.MSG_WARN) {
System.out.println(message);
} else {
System.err.println(message);
}
}
}
}
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