com.googlecode.mobilityrpc.protocol.converters.MessageConverter Maven / Gradle / Ivy

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/**
 * Copyright 2011, 2012 Niall Gallagher
 *
 * 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 com.googlecode.mobilityrpc.protocol.converters;

/**
 * Interface implemented by classes which can convert Java object (POJO) representations of messages to/from binary
 * using protobuf.
 *
 * @author Niall Gallagher
 */
public abstract class MessageConverter {

    public final T convertFromProtobuf(byte[] bytes) {
        // Call the subclass implementation but handle exceptions here...
        try {
            return fromProtobuf(bytes);
        }
        catch (Exception e) {
            throw new IllegalStateException("Failed to deserialize protobuf data of length: " + bytes.length, e);
        }
    }

    public final byte[] convertToProtobuf(T object) {
        // Call the subclass implementation but handle exceptions here...
        try {
            return toProtobuf(object);
        }
        catch (Exception e) {
            throw new IllegalStateException("Failed to serialize to protobuf object: " + object, e);
        }
    }

    protected abstract T fromProtobuf(byte[] bytes) throws Exception;

    protected abstract byte[] toProtobuf(T object) throws Exception;
}