org.kiji.hive.utils.KijiDataRequestSerializer.java Source code

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Here is the source code for org.kiji.hive.utils.KijiDataRequestSerializer.java

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/**
 * (c) Copyright 2013 WibiData, Inc.
 *
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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 org.kiji.hive.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.IOUtils;

import org.kiji.schema.KijiDataRequest;

/**
 * Serializes and deserializes a KijiDataRequest such that it is safe for Job configuration.
 */
public final class KijiDataRequestSerializer {

    /** Utility class cannot be instantiated. */
    private KijiDataRequestSerializer() {
    }

    /**
     * Serializes a data request.
     *
     * @param dataRequest A data request.
     * @return The serialized data request.
     * @throws IOException If there is an error.
     */
    public static String serialize(KijiDataRequest dataRequest) throws IOException {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final ObjectOutputStream oos = new ObjectOutputStream(baos);
        try {
            oos.writeObject(dataRequest);
            oos.flush();
            return Base64.encodeBase64String(baos.toByteArray());
        } finally {
            IOUtils.closeQuietly(oos);
        }
    }

    /**
     * Deserializes a data request.
     *
     * @param serialized A serialized data request.
     * @return A data request, or null if there is no data request in the given string.
     * @throws IOException If there is an IO error.
     */
    public static KijiDataRequest deserialize(String serialized) throws IOException {
        final byte[] bytes = Base64.decodeBase64(serialized);
        final ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytes));
        try {
            return (KijiDataRequest) ois.readObject();
        } catch (ClassNotFoundException e) {
            throw new IOException(e);
        } finally {
            IOUtils.closeQuietly(ois);
        }
    }
}