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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 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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 * elects to include this software in this distribution under the [CDDL or GPL
 * 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
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */

package com.sun.enterprise.container.common.spi.util;

import com.sun.logging.*;
import org.jvnet.hk2.annotations.Service;

import javax.inject.Inject;
import org.glassfish.hk2.api.PerLookup;
import org.glassfish.hk2.api.ServiceLocator;

import javax.inject.Singleton;

import java.io.*;
import java.security.PrivilegedExceptionAction;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.util.Collection;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * A Factory class for creating EJBObject input/output Stream
 *
 * @author Mahesh Kannan
 */

@Service
public class JavaEEObjectStreamFactory {

    @Inject
    ServiceLocator habitat;

    public static final Logger _logger = LogDomains.getLogger(
            JavaEEObjectStreamFactory.class, LogDomains.UTIL_LOGGER);

    private static Collection _empty
            = new ArrayList();
    /**
     *
     * Obtain an ObjectOutputStream that allows serialization
     *  of a graph of objects. The objects can be plain Serializable objects
     *  or can be converted into Serializable objects using
     *  the handler
     *
     *@throws java.io.IOException when the serialziation fails
     *@return an ObjectOutputStream that can be used to serialize objects
     */
    public ObjectOutputStream createObjectOutputStream(
            final OutputStream os,
            final boolean replaceObject)
        throws IOException
    {
        // Need privileged block here because EJBObjectOutputStream
        // does enableReplaceObject
        ObjectOutputStream oos = null;

        final Collection handlers = replaceObject
                ? habitat.getAllServices(JavaEEObjectStreamHandler.class) : _empty;

        if(System.getSecurityManager() == null) {
            oos = new JavaEEObjectOutputStream(os, replaceObject, handlers);
        } else {
            try {
                oos = (ObjectOutputStream) AccessController.doPrivileged(
                        new PrivilegedExceptionAction() {
                    public java.lang.Object run()
                    throws Exception {
                        return new JavaEEObjectOutputStream(os, replaceObject, handlers);
                    }
                });
            } catch ( PrivilegedActionException ex ) {
                throw (IOException) ex.getException();
            }
        }
        return oos; 
    }

    /**
     *
     * Obtain an ObjectInputStream that allows de-serialization
     *  of a graph of objects.
     *
     *@throws java.io.IOException when the de-serialziation fails
     *@return an ObjectInputStream that can be used to deserialize objects
     */
	public ObjectInputStream createObjectInputStream(
            final InputStream is,
            final boolean resolveObject,
            final ClassLoader loader)
        throws Exception
    {
        ObjectInputStream ois = null;
        if ( loader != null ) {

            final Collection handlers = resolveObject
                ? habitat.getAllServices(JavaEEObjectStreamHandler.class) : _empty;

            // Need privileged block here because EJBObjectInputStream
            // does enableResolveObject
            if(System.getSecurityManager() == null) {
                ois = new JavaEEObjectInputStream(is, loader, resolveObject, handlers);
            } else {
                try {
                    ois = (ObjectInputStream)AccessController.doPrivileged(
                            new PrivilegedExceptionAction() {
                        public java.lang.Object run()
                        throws Exception {
                            return new JavaEEObjectInputStream(
                                    is, loader, resolveObject, handlers);
                        }
                    });
                } catch ( PrivilegedActionException ex ) {
                    throw (IOException) ex.getException();
                }
            }
        } else {
            ois = new ObjectInputStream(is);
        }

        return ois;
    }

    public final byte[] serializeObject(Object obj, boolean replaceObject)
            throws java.io.IOException
    {
        byte[] data = null;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = null;
        try {
            oos = this.createObjectOutputStream(
                    bos, replaceObject);

            oos.writeObject(obj);
            oos.flush();
            data = bos.toByteArray();
        } catch (java.io.NotSerializableException notSerEx) {
            throw notSerEx;
        } catch (Exception th) {
            IOException ioEx = new IOException(th.toString());
            ioEx.initCause(th);
            throw ioEx;
        } finally {
            if (oos != null) {
                try {
                    oos.close();
                } catch (Exception ex) {
                }
            }
            try {
                bos.close();
            } catch (Exception ex) {
            }
        }

        return data;
    }

    public final Object deserializeObject(byte[] data, boolean resolveObject,
                                          ClassLoader classLoader)
            throws Exception
    {
        Object obj = null;
        ByteArrayInputStream bis = null;
        ObjectInputStream ois = null;
        try {
            bis = new ByteArrayInputStream(data);
            ois = this.createObjectInputStream(bis, resolveObject,
                    classLoader);
            obj = ois.readObject();
        } catch (Exception ex) {
            _logger.log(Level.FINE, "Error during deserialization", ex);
            throw ex;
        } finally {
            try {
                ois.close();
            } catch (Exception ex) {
                _logger.log(Level.FINEST, "Error during ois.close()", ex);
            }
            try {
                bis.close();
            } catch (Exception ex) {
                _logger.log(Level.FINEST, "Error during bis.close()", ex);
            }
        }
        return obj;
    }


}