org.apache.stratos.autoscaler.util.Deserializer.java Source code

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Here is the source code for org.apache.stratos.autoscaler.util.Deserializer.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.stratos.autoscaler.util;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class Deserializer {

    private static final Log log = LogFactory.getLog(Deserializer.class);

    /**
     * We deserialize only if the path to the serialized object file is exists.
     * @param filePath path to the serialized object file
     * @return the object obtained after deserialization or null if file isn't valid.
     * @throws Exception
     */
    public static Object deserialize(String filePath) throws Exception {

        ObjectInputStream objIn = null;
        Object obj = null;

        if (!new File(filePath).isFile()) {
            return obj;
        }

        try {

            objIn = new ObjectInputStream(new FileInputStream(filePath));
            obj = objIn.readObject();

        } catch (IOException e) {
            log.error("Failed to deserialize the file at " + filePath, e);
            throw e;

        } catch (ClassNotFoundException e) {
            log.error("Failed to deserialize the file at " + filePath, e);
            throw e;

        } finally {
            if (objIn != null) {
                objIn.close();
            }
        }

        return obj;

    }

    /**
     * Deserialize a byte array and retrieve the object.
     * @param bytes bytes to be deserialized
     * @return the deserialized {@link Object}
     * @throws Exception if the deserialization is failed.
     */
    public static Object deserializeFromByteArray(byte[] bytes) throws Exception {

        ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
        ObjectInput in = null;
        try {
            in = new ObjectInputStream(bis);
            Object o = in.readObject();

            return o;

        } finally {
            bis.close();
            if (in != null) {
                in.close();
            }
        }
    }

}