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 *
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 * 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
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package org.glassfish.appclient.client.acc;

import com.sun.appserv.connectors.internal.api.ConnectorRuntime;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.net.URLClassLoader;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.util.Collection;
import java.util.HashSet;
import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.ClassTransformer;
import javax.validation.ValidatorFactory;

import org.glassfish.api.deployment.DeploymentContext;
import org.glassfish.deployment.common.RootDeploymentDescriptor;
import org.glassfish.persistence.jpa.ProviderContainerContractInfoBase;

/**
 * Implements the internal GlassFish interface which all persistence provider
 * containers must.
 *
 * @author tjquinn
 */
public class ProviderContainerContractInfoImpl extends ProviderContainerContractInfoBase {

    private final ACCClassLoader classLoader;
    private final Instrumentation inst;
    private final String applicationLocation;

    private final Collection emfs = new HashSet();
    /**
     * Creates a new instance of the ACC's implementation of the contract.
     * The ACC uses its agent to register a VM transformer which can then
     * delegate to transformers registered with this class by the
     * persistence logic.
     *
     * @param classLoader ACC's class loader
     * @param inst VM's instrumentation object
     */
    public ProviderContainerContractInfoImpl(
            final ACCClassLoader classLoader,
            final Instrumentation inst,
            final String applicationLocation,
            final ConnectorRuntime connectorRuntime) {
        super(connectorRuntime);
        this.classLoader = classLoader;
        this.inst = inst;
        this.applicationLocation = applicationLocation;
    }

    public ClassLoader getClassLoader() {
        return classLoader;
    }

    public ClassLoader getTempClassloader() {
        return AccessController.doPrivileged(new PrivilegedAction() {

                @Override
                public URLClassLoader run() {
                    return new URLClassLoader(classLoader.getURLs());
                }

            });
    }

    public void addTransformer(ClassTransformer transformer) {
        final TransformerWrapper tw = new TransformerWrapper(transformer, classLoader);
        if (inst != null) {
            inst.addTransformer(tw);
        } else {
            classLoader.addTransformer(tw);
        }
    }

    public String getApplicationLocation() {
        return applicationLocation;
    }

    public ValidatorFactory getValidatorFactory() {
        // TODO: Need to implement this correctly.
        return null;
    }

    // TODO: remove after persistence is refactored.
    public DeploymentContext getDeploymentContext() {
        return null;
    }

    public boolean isJava2DBRequired() {
        // Returns whether Java2DB is required or not. For an AppClient it is always false
        return false;
    }

    public void registerEMF(String unitName, String persistenceRootUri, RootDeploymentDescriptor containingBundle, EntityManagerFactory emf) {
        emfs.add(emf);
    }

    public String getJTADataSourceOverride() {
        // Returns whether JTA datasource is overridden. For an appclient it is never the case.
        return null;
    }

    public Collection emfs() {
        return emfs;
    }

    /**
     * Wraps a persistence transformer in a java.lang.instrumentation.ClassFileTransformer
     * suitable for addition as a transformer to the JVM-provided instrumentation
     * class.
     */
    public static class TransformerWrapper implements ClassFileTransformer {

        private final ClassTransformer persistenceTransformer;
        private final ClassLoader classLoader;

        TransformerWrapper(final ClassTransformer persistenceTransformer,
                final ClassLoader classLoader) {
            this.persistenceTransformer = persistenceTransformer;
            this.classLoader = classLoader;
        }

        public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
            /*
             * Do not even bother running the transformer unless the loader
             * loading the class is the ACC's class loader.
             */
            return (loader.equals(classLoader) ?
                persistenceTransformer.transform(loader, className,
                    classBeingRedefined, protectionDomain, classfileBuffer)
                : null);
        }
    }

}