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/*
*
* Copyright 2001-2004 The Ant-Contrib project
*
* 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 net.sf.antcontrib.cpptasks.compiler;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.tools.ant.taskdefs.Execute;
import org.apache.tools.ant.taskdefs.ExecuteStreamHandler;
/**
* Implements ExecuteStreamHandler to capture the output of a Execute to an
* array of strings
*
* @author Curt Arnold
*/
public class CaptureStreamHandler implements ExecuteStreamHandler {
/**
* Runs an executable and captures the output in a String array
*
* @param cmdline
* command line arguments
* @return output of process
*/
public static String[] run(String[] cmdline) {
CaptureStreamHandler handler = new CaptureStreamHandler();
Execute exec = new Execute(handler);
exec.setCommandline(cmdline);
try {
exec.execute();
} catch (IOException ex) {
}
return handler.getOutput();
}
private InputStream errorStream;
private InputStream fromProcess;
private String[] output;
private LineReader outputReader;
private LineReader errorReader;
private Thread outputReaderThread;
private Thread errorReaderThread;
public CaptureStreamHandler() {
}
public String[] getOutput() {
if (this.output != null) {
return this.output;
} else {
return new String[0];
}
}
/**
* Install a handler for the error stream of the subprocess.
*
* @param is
* input stream to read from the error stream from the subprocess
*/
public void setProcessErrorStream(InputStream is) throws IOException {
errorStream = is;
}
/**
* Install a handler for the input stream of the subprocess.
*
* @param os
* output stream to write to the standard input stream of the
* subprocess
*/
public void setProcessInputStream(OutputStream os) throws IOException {
os.close();
}
/**
* Install a handler for the output stream of the subprocess.
*
* @param is
* input stream to read from the error stream from the subprocess
*/
public void setProcessOutputStream(InputStream is) throws IOException {
fromProcess = is;
}
/**
* Start handling of the streams.
*/
public void start() throws IOException {
this.outputReader = new LineReader(this.fromProcess);
this.errorReader = new LineReader(this.errorStream);
this.outputReaderThread = new Thread(this.outputReader);
this.errorReaderThread = new Thread(this.errorReader);
outputReaderThread.start();
errorReaderThread.start();
}
/**
* Stop handling of the streams - will not be restarted.
*/
public void stop() {
try {
if (this.outputReaderThread != null) {
this.outputReaderThread.join();
}
if (this.errorReaderThread != null) {
this.errorReaderThread.join();
}
} catch (InterruptedException e) {
}
String[] outputLines = null;
String[] errorLines = null;
if (this.outputReader != null) {
outputLines = this.outputReader.getLines();
} else {
outputLines = new String[0];
}
if (this.errorReader != null) {
errorLines = this.errorReader.getLines();
} else {
errorLines = new String[0];
}
this.output = new String[outputLines.length + errorLines.length];
int pos = 0;
for (int i = 0; i < errorLines.length; i++) {
this.output[pos++] = errorLines[i];
}
for (int i = 0; i < outputLines.length; i++) {
this.output[pos++] = outputLines[i];
}
}
}
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