org.rhq.helpers.bundleGen.BundleGen.java Source code

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Here is the source code for org.rhq.helpers.bundleGen.BundleGen.java

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/*
 * RHQ Management Platform
 * Copyright (C) 2005-2009 Red Hat, Inc.
 * All rights reserved.
 *
 * 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 version 2 of the License.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.rhq.helpers.bundleGen;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Writer;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import freemarker.cache.ClassTemplateLoader;
import freemarker.cache.MultiTemplateLoader;
import freemarker.cache.TemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;

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

import org.rhq.core.util.stream.StreamUtil;

/**
 * Main class of a (simple) bundle creator
 * @author Heiko W. Rupp
 */
public class BundleGen {

    private final Log log = LogFactory.getLog(BundleGen.class);

    public static void main(String[] args) throws Exception {
        BundleGen bg = new BundleGen();
        bg.run();
    }

    private void run() {

        ResourceBundle resourceBundle = ResourceBundle.getBundle("bundleGen");
        Props props = new Props();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        // Ask the user
        XmlQuestionsReader xqr = new XmlQuestionsReader("bundleQuestions");
        try {
            xqr.readQuestions(br, props);
        } catch (Exception e) {
            log.error(e.getMessage());
            return;
        }

        String bundleTargetDirectory = "/tmp"; // TODO ask user?

        String tmpDirPath = System.getProperty("java.io.tmpdir");
        log.debug("Java Tmp dir is " + tmpDirPath);

        String genPath = tmpDirPath + "/" + "bundleGen";
        File tmpDir = new File(genPath); // TODO path separator
        if (!tmpDir.exists() && !tmpDir.mkdir()) {
            log.error(resourceBundle.getString("no.tmp.dir"));
            System.exit(1);
        }

        createFile(props, "deployMain", "deploy.xml", genPath);

        try {
            File outFile = new File(genPath, "generatedBundle.zip");
            ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(outFile));
            try {
                copyToOutputStream(zos, genPath, "deploy.xml");
                copyToOutputStream(zos, props.getContentDir(), props.getBundleFile());
            } finally {
                // by definition this automatically flushes!
                zos.close();
            }

            File targetFile = new File(bundleTargetDirectory + "/" + "generatedBundle.zip");
            boolean success = outFile.renameTo(targetFile);
            if (success)
                log.info(MessageFormat.format(resourceBundle.getString("bundle.ready"),
                        targetFile.getAbsolutePath()));
            else {
                log.debug("Could not rename file to [" + targetFile.getAbsolutePath() + "]");
                log.info(MessageFormat.format(resourceBundle.getString("bundle.ready"), outFile.getAbsolutePath()));
            }

        } catch (IOException e) {
            e.printStackTrace(); // TODO: Customise this generated block
        }

    }

    /**
     * Copy a file to the passed Zip Output Stream
     * @param zos OutputStream for a new Zip file
     * @param filedir directory of the file to copy
     * @param fileName name of the file to copy
     * @throws IOException If anything here goes wrong.
     */
    private void copyToOutputStream(ZipOutputStream zos, String filedir, String fileName) throws IOException {
        ZipEntry entry = new ZipEntry(fileName);
        zos.putNextEntry(entry);
        FileInputStream fis = new FileInputStream(new File(filedir, fileName));
        try {
            StreamUtil.copy(fis, zos, false);
            zos.flush();
            log.debug("Added [" + fileName + "]");
        } finally {
            fis.close();
        }
    }

    /**
     * Apply a freemarker template to generate a file
     * @param props The properties used to create the respective file
     * @param template The name of the template without .ftl suffix
     * @param fileName The name of the file to create
     * @param directory The name of the directory to create in
     */
    public void createFile(Props props, String template, String fileName, String directory) {

        try {
            log.info("Trying to generate " + directory + "/" + fileName);
            Configuration config = new Configuration();

            ClassTemplateLoader ctl = new ClassTemplateLoader(getClass(), "/");
            TemplateLoader[] loaders = new TemplateLoader[] { ctl };
            MultiTemplateLoader mtl = new MultiTemplateLoader(loaders);

            config.setTemplateLoader(mtl);

            Template templ = config.getTemplate(template + ".ftl");

            Writer out = new BufferedWriter(new FileWriter(new File(directory, fileName)));
            try {
                Map<String, Props> root = new HashMap<String, Props>();
                root.put("props", props);
                templ.process(root, out);
            } finally {
                out.close();
            }
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } catch (TemplateException te) {
            te.printStackTrace();
        }
    }
}