LastLineReader.java

/**
 * This file is part of Waarp Project.
 * 
 * Copyright 2009, Frederic Bregier, and individual contributors by the @author tags. See the
 * COPYRIGHT.txt in the distribution for a full listing of individual contributors.
 * 
 * All Waarp Project is free software: you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 * 
 * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with Waarp . If not, see
 * <http://www.gnu.org/licenses/>.
 */
package org.waarp.openr66.context.task;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PipedInputStream;

/**
 * This class is used with external process in order to get the last echo from the stdout of the
 * process.
 * 
 * @author Frederic Bregier
 * 
 */
class LastLineReader implements Runnable {
    private final BufferedReader reader;
    /**
     * This will be the result at the end
     */
    private String lastLine = null;

    public LastLineReader(PipedInputStream inputStream) {
        reader = new BufferedReader(new InputStreamReader(inputStream));
    }

    public void run() {
        String line;
        try {
            while ((line = reader.readLine()) != null) {
                line = line.trim();
                if (!line.isEmpty()) {
                    setLastLine(line);
                }
            }
        } catch (IOException e) {
            // Could be a "Write end dead", which means the end of the thread
            // writer is found
            // before the thread closes the write pipe
        }
        try {
            reader.close();
        } catch (IOException e) {
        }
    }

    /**
     * @return the lastLine
     */
    public String getLastLine() {
        return lastLine;
    }

    /**
     * @param lastLine the lastLine to set
     */
    private void setLastLine(String lastLine) {
        this.lastLine = lastLine;
    }

}