ViewerErrorScanner.java

/*
 * $Id$
 *
 * Copyright (c) 2004-2005 by the TeXlapse Team.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package net.sourceforge.texlipse.viewer.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

import net.sourceforge.texlipse.builder.BuilderRegistry;


/**
 * A helper class to read the viewer error stream if an error occurs.
 * 
 * @author Kimmo Karlsson
 */
public class ViewerErrorScanner implements Runnable {

    // the process to monitor
    private Process process;

    public ViewerErrorScanner(Process process) {
        this.process = process;
    }
    
    /**
     * Wait for the program to exit and read the status.
     */
    public void run() {
        
        BufferedReader in = new BufferedReader(new InputStreamReader(process.getErrorStream()));
        
        ArrayList buffer = new ArrayList();
        String tmp = null;
        try {
            
            // read the error output stream lines before the program exits
            // the stream is not available anymore after the program has exit
            while ((tmp = in.readLine()) != null) {
                buffer.add(tmp);
            }
            in.close();
            
        } catch (IOException e) {
        }
        
        int exitCode = 0;
        try {
            exitCode = process.waitFor();
        } catch (InterruptedException e) {
        }

        // if there was an error, the viewer exited with non-zero status
        if (exitCode != 0) {
            // print the error messages
            for (int i = 0; i < buffer.size(); i++) {
                tmp = (String) buffer.get(i);
                BuilderRegistry.printToConsole("viewer> " + tmp);
            }
        }
    }
}