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/*
 * ObjectSerializer.java from LicenseManager modified Thursday, May 17, 2012 21:31:40 CDT (-0500).
 *
 * Copyright 2010-2013 the original author or authors.
 *
 * Licensed 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 ro.esolutions.licensing;

import org.apache.commons.io.output.ByteArrayOutputStream;
import ro.esolutions.licensing.exception.ObjectDeserializationException;
import ro.esolutions.licensing.exception.ObjectSerializationException;
import ro.esolutions.licensing.exception.ObjectTypeNotExpectedException;

import java.io.*;

/**
 * This is a helper class for writing any object and reading simple objects (no
 * arrays, collections, or generic top-level objects) to and from byte arrays.
 *
 * @author Nick Williams
 * @version 1.0.0
 * @since 1.0.0
 */
public final class ObjectSerializer {

    public final  T readObject(final Class expectedType, final byte[] byteStream)
            throws ObjectDeserializationException {
        try (final ByteArrayInputStream bytes = new ByteArrayInputStream(byteStream);
             final ObjectInputStream stream = new ObjectInputStream(bytes)) {

            final Object allegedObject = stream.readObject();
            if (!expectedType.isInstance(allegedObject)) {
                throw new ObjectTypeNotExpectedException(expectedType.getName(), allegedObject.getClass().getName());
            }

            return expectedType.cast(allegedObject);
        } catch (final IOException e) {
            throw new ObjectDeserializationException("An I/O error occurred while reading the object from the byte array.", e);
        } catch (final ClassNotFoundException | NoClassDefFoundError e) {
            throw new ObjectTypeNotExpectedException(expectedType.getName(), e.getMessage(), e);
        }
    }

    /**
     * Serializes the {@link Serializable} object passed and returns it as a byte array.
     *
     * @param object The object to serialize
     * @return the byte stream with the object serialized in it.
     * @throws ObjectSerializationException if an I/O exception occurs while serializing the object.
     */
    public final byte[] writeObject(final Serializable object) throws ObjectSerializationException {

        try (final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
             final ObjectOutputStream stream = new ObjectOutputStream(bytes)) {
            stream.writeObject(object);
            return bytes.toByteArray();
        } catch (final IOException e) {
            throw new ObjectSerializationException(e);
        }


    }
}