org.formic.ant.TemplateTask.java Source code

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Here is the source code for org.formic.ant.TemplateTask.java

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/**
 * Formic installer framework.
 * Copyright (C) 2012  Eric Van Dewoestine
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.formic.ant;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

import java.util.HashMap;

import org.apache.commons.io.IOUtils;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;

import org.apache.tools.ant.taskdefs.Move;

import org.apache.velocity.VelocityContext;

import org.apache.velocity.app.Velocity;

import org.formic.wizard.step.shared.TemplateStepAction;

/**
 * Ant task to evaluate a velocity template.
 *
 * @author Eric Van Dewoestine
 */
public class TemplateTask extends Task {
    private File template;
    private File out;
    private boolean move;

    public void execute() throws BuildException {
        if (template == null || out == null) {
            throw new BuildException("Both template and out attributes must be supplied");
        }

        if (template.equals(out)) {
            out = new File(out.getAbsolutePath() + ".out");
            move = true;
        }

        HashMap values = new HashMap();

        values.put(TemplateStepAction.INSTALLER_KEY, TemplateStepAction.INSTALLER);
        values.put(TemplateStepAction.OS_KEY, TemplateStepAction.OS);
        values.putAll(getProject().getProperties());

        FileReader reader = null;
        FileWriter writer = null;
        try {
            log("Evaluating template: " + template);
            reader = new FileReader(this.template);
            writer = new FileWriter(this.out);
            VelocityContext context = new VelocityContext(values);
            Velocity.evaluate(context, writer, TemplateTask.class.getName(), reader);
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            IOUtils.closeQuietly(reader);
            IOUtils.closeQuietly(writer);
        }

        if (move) {
            Move move = new Move();
            move.setProject(getProject());
            move.setTaskName(getTaskName());
            move.setFile(out);
            move.setTofile(template);
            move.execute();
        }
    }

    public void setTemplate(File template) {
        this.template = template;
    }

    public void setOut(File out) {
        this.out = out;
    }
}