org.apache.hdt.core.cluster.utils.JarModule.java Source code

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Here is the source code for org.apache.hdt.core.cluster.utils.JarModule.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hdt.core.cluster.utils;

import java.io.File;
import java.util.logging.Logger;

import org.apache.hdt.core.Activator;
import org.apache.hdt.core.dialogs.ErrorMessageDialog;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.ui.jarpackager.IJarExportRunnable;
import org.eclipse.jdt.ui.jarpackager.JarPackageData;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;

/**
 * Methods for interacting with the jar file containing the
 * Mapper/Reducer/Driver classes for a MapReduce job.
 */

public class JarModule implements IRunnableWithProgress {

    static Logger log = Logger.getLogger(JarModule.class.getName());

    private IResource resource;

    private File jarFile;

    public JarModule(IResource resource) {
        this.resource = resource;
    }

    public String getName() {
        return resource.getProject().getName() + "/" + resource.getName();
    }

    /**
     * Creates a JAR file containing the given resource (Java class with
     * main()) and all associated resources
     * 
     * @param resource the resource
     * @return a file designing the created package
     */
    public void run(IProgressMonitor monitor) {

        log.fine("Build jar");
        JarPackageData jarrer = new JarPackageData();

        jarrer.setExportJavaFiles(true);
        jarrer.setExportClassFiles(true);
        jarrer.setExportOutputFolders(true);
        jarrer.setOverwrite(true);

        try {
            // IJavaProject project =
            // (IJavaProject) resource.getProject().getNature(JavaCore.NATURE_ID);

            // check this is the case before letting this method get called
            Object element = resource.getAdapter(IJavaElement.class);
            IType type = ((ICompilationUnit) element).findPrimaryType();
            jarrer.setManifestMainClass(type);

            // Create a temporary JAR file name
            File baseDir = Activator.getDefault().getStateLocation().toFile();

            String prefix = String.format("%s_%s-", resource.getProject().getName(), resource.getName());
            File jarFile = File.createTempFile(prefix, ".jar", baseDir);
            jarrer.setJarLocation(new Path(jarFile.getAbsolutePath()));

            jarrer.setElements(resource.getProject().members(IResource.FILE));
            IJarExportRunnable runnable = jarrer.createJarExportRunnable(Display.getDefault().getActiveShell());
            runnable.run(monitor);

            this.jarFile = jarFile;

        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * Allow the retrieval of the resulting JAR file
     * 
     * @return the generated JAR file
     */
    public File getJarFile() {
        return this.jarFile;
    }

    /**
     * Static way to create a JAR package for the given resource and showing a
     * progress bar
     * 
     * @param resource
     * @return
     */
    public static File createJarPackage(IResource resource) {

        JarModule jarModule = new JarModule(resource);
        try {
            PlatformUI.getWorkbench().getProgressService().run(false, true, jarModule);

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

        File jarFile = jarModule.getJarFile();
        if (jarFile == null) {
            ErrorMessageDialog.display("Run on Hadoop", "Unable to create or locate the JAR file for the Job");
            return null;
        }

        return jarFile;
    }

}