source: branches/objectmq-1.0/src/omq/common/util/Serializer.java

package omq.common.util;

import java.io.IOException;
import java.util.Properties;

import omq.common.event.Event;
import omq.common.message.Request;
import omq.common.message.Response;
import omq.common.util.Serializers.ISerializer;
import omq.exception.EnvironmentException;
import omq.exception.SerializerException;
import omq.server.remote.request.RemoteObject;

/**
 * 
 * @author Sergi Toda <sergi.toda@estudiants.urv.cat>
 * 
 */
public class Serializer {
        public static ISerializer serializer;

        private static Boolean getEnableCompression() {
                Boolean enableCompression = false;
                try {
                        Properties env = Environment.getEnvironment();
                        enableCompression = Boolean.valueOf(env.getProperty(ParameterQueue.ENABLECOMPRESSION, "false"));
                } catch (EnvironmentException e) {
                        e.printStackTrace();
                }

                return enableCompression;
        }

        public static ISerializer getInstance() throws SerializerException {
                if (serializer == null) {
                        try {
                                Properties env = Environment.getEnvironment();
                                String className = env.getProperty(ParameterQueue.SERIALIZERNAME, "omq.common.util.Serializers.JavaImp");

                                if (className == null || className.isEmpty()) {
                                        throw new ClassNotFoundException("Class name is null or empty.");
                                }

                                serializer = (ISerializer) Class.forName(className).newInstance();
                        } catch (Exception ex) {
                                throw new SerializerException(ex.getMessage(), ex);
                        }
                }

                return serializer;
        }

        public static byte[] serialize(Object obj) throws SerializerException {
                ISerializer instance = getInstance();

                Boolean enableCompression = getEnableCompression();
                if (enableCompression) {
                        byte[] objSerialized = instance.serialize(obj);
                        try {
                                return Zipper.zip(objSerialized);
                        } catch (IOException e) {
                                throw new SerializerException(e.getMessage(), e);
                        }
                } else {
                        return instance.serialize(obj);
                }
        }

        public static Request deserializeRequest(byte[] bytes, RemoteObject obj) throws SerializerException {
                ISerializer instance = getInstance();

                Boolean enableCompression = getEnableCompression();
                if (enableCompression) {
                        try {
                                byte[] unZippedBytes = Zipper.unzip(bytes);
                                return instance.deserializeRequest(unZippedBytes, obj);
                        } catch (IOException e) {
                                throw new SerializerException(e.getMessage(), e);
                        }
                } else {
                        return instance.deserializeRequest(bytes, obj);
                }
        }

        public static Response deserializeResponse(byte[] bytes, Class<?> type) throws SerializerException {
                ISerializer instance = getInstance();

                Boolean enableCompression = getEnableCompression();
                if (enableCompression) {
                        try {
                                byte[] unZippedBytes = Zipper.unzip(bytes);
                                return instance.deserializeResponse(unZippedBytes, type);
                        } catch (IOException e) {
                                throw new SerializerException(e.getMessage(), e);
                        }
                } else {
                        return instance.deserializeResponse(bytes, type);
                }
        }

        public static Event deserializeEvent(byte[] bytes) throws SerializerException {
                ISerializer instance = getInstance();

                Boolean enableCompression = getEnableCompression();
                if (enableCompression) {
                        try {
                                byte[] unZippedBytes = Zipper.unzip(bytes);
                                return instance.deserializeEvent(unZippedBytes);
                        } catch (IOException e) {
                                throw new SerializerException(e.getMessage(), e);
                        }
                } else {
                        return instance.deserializeEvent(bytes);
                }
        }
}