controllerTas.actions.gnuplot.GnuplotExec.java Source code

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Here is the source code for controllerTas.actions.gnuplot.GnuplotExec.java

Source

package controllerTas.actions.gnuplot; /*
                                       * INESC-ID, Instituto de Engenharia de Sistemas e Computadores Investigao e Desevolvimento em Lisboa
                                       * Copyright 2013 INESC-ID and/or its affiliates and other
                                       * contributors as indicated by the @author tags. All rights reserved.
                                       * See the copyright.txt in the distribution for a full listing of
                                       * individual contributors.
                                       *
                                       * This is free software; you can redistribute it and/or modify it
                                       * under the terms of the GNU Lesser General Public License as
                                       * published by the Free Software Foundation; either version 3.0 of
                                       * the License, or (at your option) any later version.
                                       *
                                       * This software 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
                                       * Lesser General Public License for more details.
                                       *
                                       * You should have received a copy of the GNU Lesser General Public
                                       * License along with this software; if not, write to the Free
                                       * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
                                       * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
                                       */

/**
 * @author Diego Didona, didona@gsd.inesc-id.pt
 *         Date: 01/02/13
 */

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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

/**
 * @author Diego Didona, didona@gsd.inesc-id.pt
 *         Date: 01/02/13
 */
public class GnuplotExec {

    private String[] execCommand;
    private static final Log log = LogFactory.getLog(GnuplotExec.class);

    public GnuplotExec(String command, String script) {
        execCommand = new String[] { command, script };
    }

    public void exec() throws GnuplotException {
        try {
            Process p = Runtime.getRuntime().exec(execCommand);
            checkForError(p);
            p.destroy();
        } catch (Exception e) {
            throw new GnuplotException(e.getMessage());
        }
    }

    protected void checkForError(Process p) throws IOException, GnuplotException {
        BufferedReader stderr = new BufferedReader(new InputStreamReader(p.getErrorStream()));
        String read;

        StringBuilder errorString = new StringBuilder();
        boolean error = false;

        while ((read = stderr.readLine()) != null) {
            errorString.append(read);
            error = true;
        }

        if (error) {
            log.warn(errorString.toString());
            throw new GnuplotException((read));
        }
    }
}