cherry.goods.crypto.DefaultVersionStrategy.java Source code

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Here is the source code for cherry.goods.crypto.DefaultVersionStrategy.java

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/*
 * Copyright 2014,2015 agwlvssainokuni
 *
 * 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 cherry.goods.crypto;

import com.google.common.io.ByteArrayDataInput;
import com.google.common.io.ByteArrayDataOutput;
import com.google.common.io.ByteStreams;

/**
 * ??????<br />
 * ??????????? (4?) ?????
 */
public class DefaultVersionStrategy implements VersionStrategy<byte[], Integer> {

    @Override
    public byte[] encode(byte[] data, Integer version) {
        ByteArrayDataOutput out = ByteStreams.newDataOutput();
        out.writeInt(version.intValue());
        out.write(data);
        return out.toByteArray();
    }

    @Override
    public VersionedData<byte[], Integer> decode(byte[] encoded) {
        ByteArrayDataInput in = ByteStreams.newDataInput(encoded);
        int version = in.readInt();
        byte[] data = new byte[encoded.length - 4];
        in.readFully(data);
        return new VersionedData<byte[], Integer>(data, version);
    }

}