Glassfish example source code file (JPABundleProcessor.java)

This example Glassfish source code file (JPABundleProcessor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

bundle, bundle, eclipselink_jpa_provider, exception, inputstream, io, ioexception, ioexception, jpabundleprocessor, jpabundleprocessor, log, logging, net, network, persistence, runtimeexception, serializable, string, string, util

The Glassfish JPABundleProcessor.java source code

/*
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 *
 * Copyright (c) 2009-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
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 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package org.glassfish.osgijpa;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.glassfish.osgijpa.dd.PersistenceXMLReaderWriter;
import org.glassfish.osgijpa.dd.Persistence;
import org.glassfish.osgijavaeebase.BundleResource;
import org.glassfish.osgijavaeebase.OSGiBundleArchive;
import org.osgi.framework.BundleReference;

import java.io.Serializable;
import java.net.URL;
import java.net.MalformedURLException;
import java.util.*;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.io.InputStream;
import java.io.IOException;

/**
 * @author Sanjeeb.Sahoo@Sun.COM
*/
class JPABundleProcessor implements Serializable // we write it to a file, so it must be serializable
{
    private static final Logger logger =
            Logger.getLogger(JPABundleProcessor.class.getPackage().getName());

    public static final String PXML_PATH = "META-INF/persistence.xml";

    private static final String ECLIPSELINK_JPA_PROVIDER =
            "org.eclipselink.jpa.PersistenceProvider";

    // A marker header to indicate that a bundle has been statically weaved
    // This is used to avoid updating infinitely
    public static final String STATICALLY_WEAVED = "GlassFish-StaticallyWeaved";

    private long bundleId; // store the id so that we don't have a hard reference to bundle

    private List<Persistence> persistenceXMLs;
    private static final long serialVersionUID = -1293408086392301220L;

    JPABundleProcessor(Bundle b)
    {
        this.bundleId = b.getBundleId();
    }

    boolean isJPABundle() {
        if (persistenceXMLs == null) {
            discoverPxmls();
        }
        return !persistenceXMLs.isEmpty();
    }

    void discoverPxmls() {
        assert(persistenceXMLs == null);
        persistenceXMLs = new ArrayList<Persistence>();
        if (isFragment()) return;
        for (BundleResource r : new OSGiBundleArchive(getBundle())) {
            if (PXML_PATH.equals(r.getPath())) {
                URL pxmlURL;
                try {
                    pxmlURL = r.getUri().toURL();
                } catch (MalformedURLException e) {
                    throw new RuntimeException(e); // TODO(Sahoo): Proper Exception Handling
                }
                InputStream is = null;
                try {
                    is = pxmlURL.openStream();
                    Persistence persistence = new PersistenceXMLReaderWriter().read(is);
                    persistence.setUrl(pxmlURL);
                    persistence.setPURoot(r.getArchivePath());
                    persistenceXMLs.add(persistence);
                } catch (IOException ioe) {
                    logger.logp(Level.WARNING, "JPABundleProcessor", "discoverPxmls", "Exception occurred while processing " + pxmlURL, ioe);
                } finally {
                    if (is != null) try {is.close();} catch (IOException ioe) {}
                }
            }
        }
    }

    boolean validate(List<Persistence> persistenceList)
    {
        for (Persistence persistence : persistenceList) {
            for (Persistence.PersistenceUnit pu : persistence.getPersistenceUnit()) {
                if (pu.getProvider() == null) continue;
                if (ECLIPSELINK_JPA_PROVIDER.equals(pu.getProvider())) {
                    return false;
                } else {
                    logger.logp(Level.INFO, "JPABundleProcessor", "validate",
                            "{0} has a persistence-unit which does not use {1} as provider",
                            new Object[]{persistence, ECLIPSELINK_JPA_PROVIDER});
                }

            }
        }
        return true;
    }

    InputStream enhance() throws BundleException, IOException
    {
        JPAEnhancer enhancer = new EclipseLinkEnhancer();
        InputStream enhancedStream = enhancer.enhance(getBundle(), persistenceXMLs);
        return enhancedStream;
    }

    public boolean isEnhanced() {
        return getBundle().getHeaders().get(STATICALLY_WEAVED)!=null;
    }

    private boolean isFragment() {
        return getBundle().getHeaders().get(org.osgi.framework.Constants.FRAGMENT_HOST) != null;
    }

    public Bundle getBundle() {
        Bundle b = getBundleContext().getBundle(bundleId);
        if (b == null) {
            throw new RuntimeException("Bundle with id " + bundleId + " has already been uninstalled");
        }
        return b;
    }

    private BundleContext getBundleContext() {
        return BundleReference.class.cast(getClass().getClassLoader()).getBundle().getBundleContext();
    }

    /* package */ long getBundleId() {
        return bundleId;
    }
}