com.bluexml.side.util.libs.velocity.VelocityGenerator.java Source code

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Here is the source code for com.bluexml.side.util.libs.velocity.VelocityGenerator.java

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/*
Copyright (C) 2007-2011  BlueXML - www.bluexml.com
    
This program 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.
    
This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
    
*/

package com.bluexml.side.util.libs.velocity;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.io.IOUtils;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.eclipse.core.runtime.Assert;

public class VelocityGenerator {
    List<VelocityAction> vActions = new ArrayList<VelocityAction>();

    public void addAction(VelocityAction vc) {
        vActions.add(vc);
    }

    public void addAction(String velocityTemplatePath, String fileoutPath, Map<String, Object> context) {
        vActions.add(new VelocityAction(context, velocityTemplatePath, fileoutPath));
    }

    public VelocityGenerator(VelocityAction vc) {
        addAction(vc);
    }

    public VelocityGenerator(String velocityTemplatePath, String fileoutPath, Map<String, Object> context) {
        addAction(velocityTemplatePath, fileoutPath, context);
    }

    public void generateAll() throws Exception {
        for (VelocityAction va : vActions) {
            Assert.isNotNull(va.getOutputFilePath(),
                    "this velocity generator must have an output stream where to write");
            // the output is a path where it's possible to obtain a stream
            String out = va.getOutputFilePath();
            File f = new File(out);
            Writer fw = new FileWriter(f);

            generate(va, fw);

        }
    }

    /**
     * @param va
     * @param fw
     * @throws Exception
     * @throws IOException
     */
    public void generate(VelocityAction va, Writer fw) throws Exception, IOException {
        Assert.isNotNull(va.getContext(), "velocity context must be given");
        Assert.isNotNull(va.getTemplatePath(), "velocity template must be given");

        // get Template
        VelocityContext context = va.getContext();
        String templatePath = va.getTemplatePath();
        InputStream template = null;
        File templateFile = new File(templatePath);
        if (templateFile.exists()) {
            // the template is located on File System
            template = new FileInputStream(templateFile);
        } else {
            // resource may be acceded in classPath
            template = getClass().getResourceAsStream(templatePath);
        }

        Assert.isNotNull(template, "velocity template resource can't be loaded");
        // execute
        Velocity.init();
        String s = IOUtils.toString(template);
        Velocity.evaluate(context, fw, "log", s);

        // close streams
        template.close();
        fw.flush();
        fw.close();
    }

}