uk.ac.tgac.conan.core.service.impl.VelocityMergerServiceImpl.java Source code

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Here is the source code for uk.ac.tgac.conan.core.service.impl.VelocityMergerServiceImpl.java

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/**
 * RAMPART - Robust Automatic MultiPle AssembleR Toolkit
 * Copyright (C) 2013  Daniel Mapleson - TGAC
 * 
 * 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 uk.ac.tgac.conan.core.service.impl;

import org.apache.commons.io.FileUtils;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import uk.ac.tgac.conan.core.service.VelocityMergerService;

import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.util.List;
import java.util.Properties;

@Service
public class VelocityMergerServiceImpl implements VelocityMergerService {

    private static Logger log = LoggerFactory.getLogger(VelocityMergerServiceImpl.class);

    @Override
    public void merge(File template, File context, File output) throws IOException {
        VelocityContext vc = loadContext(context);
        this.merge(template, vc, output);
    }

    @Override
    public void merge(File template, VelocityContext context, File output) throws IOException {

        log.debug("Loading template data");

        // Load the template
        String template_data = FileUtils.readFileToString(template);

        // Create the output writer
        StringWriter writer = new StringWriter();

        log.debug("Merging template and exectx");

        // Create Velocity properties
        Properties vp = new Properties();
        vp.setProperty("resource.loader", "class");
        vp.setProperty("class.resource.loader.description", "Velocity Classpath Resource Loader");
        vp.setProperty("class.resource.loader.class",
                "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
        vp.setProperty("runtime.log.logsystem.log4j.logger", VelocityMergerServiceImpl.class.getName());

        // Merge the template and the exectx
        VelocityEngine ve = new VelocityEngine(vp);
        ve.init();
        ve.evaluate(context, writer, "LaTeX Report Builder", template_data);
        writer.flush();
        writer.close();

        log.debug("Writing merged file to disk");

        // Output to file 
        FileUtils.writeStringToFile(output, writer.toString());

        log.debug("Velocity template and exectx merged and saved successfully");
    }

    protected VelocityContext loadContext(File context_path) throws IOException {

        log.debug("Loading velocity exectx from ini-style file");

        List<String> context_lines = FileUtils.readLines(context_path);
        VelocityContext vc = new VelocityContext();
        for (String context_line : context_lines) {

            if (context_line == null || context_line.trim().isEmpty()) {
                continue;
            }

            String[] parts = context_line.split("=");
            vc.put(parts[0], parts[1]);
        }

        log.debug("Velocity exectx loaded successfully from ini-style file");

        return vc;
    }

}