| /* |
| * 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. |
| */ |
| |
| /* $Id$ */ |
| |
| 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 final class ConvertUtils { |
| |
| private 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 (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); |
| } |
| |
| } |
| |
| |
| } |