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/*
* Copyright 2005 The Apache Software Foundation.
*
* 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.
*/
/* $Id$ */
package org.apache.fop.visual;
import java.io.File;
import java.io.IOException;
import org.apache.commons.logging.Log;
/**
* Utilities for converting files with external converters.
*/
public class ConvertUtils {
/**
* Calls an external converter application (GhostScript, for example).
* @param cmd the full command
* @param envp array of strings, each element of which has environment variable settings
* in format name=value.
* @param workDir the working directory of the subprocess, or null if the subprocess should
* inherit the working directory of the current process.
* @param log the logger to log output by the external application to
* @throws IOException in case the external call fails
*/
public static void convert(String cmd, String[] envp, File workDir, final Log log)
throws IOException {
log.debug(cmd);
Process process = null;
try {
process = Runtime.getRuntime().exec(cmd, envp, null);
//Redirect stderr output
RedirectorLineHandler errorHandler = new AbstractRedirectorLineHandler() {
public void handleLine(String line) {
log.error("ERR> " + line);
}
};
StreamRedirector errorRedirector
= new StreamRedirector(process.getErrorStream(), errorHandler);
//Redirect stdout output
RedirectorLineHandler outputHandler = new AbstractRedirectorLineHandler() {
public void handleLine(String line) {
log.debug("OUT> " + line);
}
};
StreamRedirector outputRedirector
= new StreamRedirector(process.getInputStream(), outputHandler);
new Thread(errorRedirector).start();
new Thread(outputRedirector).start();
process.waitFor();
} catch (java.lang.InterruptedException ie) {
throw new IOException("The call to the external converter failed: " + ie.getMessage());
} catch (java.io.IOException ioe) {
throw new IOException("The call to the external converter failed: " + ioe.getMessage());
}
int exitValue = process.exitValue();
if (exitValue != 0) {
throw new IOException("The call to the external converter failed. Result: "
+ exitValue);
}
}
}
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