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A library to reliably execute external processes from within the JVM
/*
* 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.commons.exec.launcher;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.util.StringUtils;
/**
* A command launcher for VMS that writes the command to a temporary DCL script
* before launching commands. This is due to limitations of both the DCL
* interpreter and the Java VM implementation.
*/
public class VmsCommandLauncher extends Java13CommandLauncher {
/**
* Launches the given command in a new process.
*/
public Process exec(final CommandLine cmd, final Map env)
throws IOException {
CommandLine vmsCmd = new CommandLine(
createCommandFile(cmd, env).getPath()
);
return super.exec(vmsCmd, env);
}
/**
* Launches the given command in a new process, in the given working
* directory. Note that under Java 1.3.1, 1.4.0 and 1.4.1 on VMS this method
* only works if workingDir
is null or the logical
* JAVA$FORK_SUPPORT_CHDIR needs to be set to TRUE.
*/
public Process exec(final CommandLine cmd, final Map env,
final File workingDir) throws IOException {
CommandLine vmsCmd = new CommandLine(
createCommandFile(cmd, env).getPath()
);
return super.exec(vmsCmd, env, workingDir);
}
/** @see org.apache.commons.exec.launcher.CommandLauncher#isFailure(int) */
public boolean isFailure( final int exitValue )
{
// even exit value signals failure
return (exitValue % 2) == 0;
}
/*
* Writes the command into a temporary DCL script and returns the
* corresponding File object. The script will be deleted on exit.
*/
private File createCommandFile(final CommandLine cmd, final Map env)
throws IOException {
File script = File.createTempFile("EXEC", ".TMP");
script.deleteOnExit();
PrintWriter out = null;
try {
out = new PrintWriter(new FileWriter(script.getAbsolutePath(),true));
// add the environment as global symbols for the DCL script
if (env != null) {
Set entries = env.entrySet();
for (Iterator iter = entries.iterator(); iter.hasNext();) {
Entry entry = (Entry) iter.next();
out.print("$ ");
out.print(entry.getKey());
out.print(" == "); // define as global symbol
out.println('\"');
String value = (String) entry.getValue();
// Any embedded " values need to be doubled
if (value.indexOf('\"') > 0){
StringBuffer sb = new StringBuffer();
for (int i = 0; i < value.length(); i++) {
char c = value.charAt(i);
if (c == '\"') {
sb.append('\"');
}
sb.append(c);
}
value=sb.toString();
}
out.print(value);
out.println('\"');
}
}
final String command = cmd.getExecutable();
if (cmd.isFile()){// We assume it is it a script file
out.print("$ @");
// This is a bit crude, but seems to work
String parts[] = StringUtils.split(command,"/");
out.print(parts[0]); // device
out.print(":[");
out.print(parts[1]); // top level directory
final int lastPart = parts.length-1;
for(int i=2; i< lastPart; i++){
out.print(".");
out.print(parts[i]);
}
out.print("]");
out.print(parts[lastPart]);
} else {
out.print("$ ");
out.print(command);
}
String[] args = cmd.getArguments();
for (int i = 0; i < args.length; i++) {
out.println(" -");
out.print(args[i]);
}
out.println();
} finally {
if (out != null) {
out.close();
}
}
return script;
}
}