org.apache.nutch.util.WritableTestUtils.java Source code

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Here is the source code for org.apache.nutch.util.WritableTestUtils.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.nutch.util;

import org.apache.hadoop.io.*;
import org.apache.hadoop.conf.*;

import junit.framework.TestCase;

public class WritableTestUtils {

    /** Utility method for testing writables. */
    public static void testWritable(Writable before) throws Exception {
        testWritable(before, null);
    }

    /** Utility method for testing writables. */
    public static void testWritable(Writable before, Configuration conf) throws Exception {
        TestCase.assertEquals(before, writeRead(before, conf));
    }

    /** Utility method for testing writables. */
    public static Writable writeRead(Writable before, Configuration conf) throws Exception {

        DataOutputBuffer dob = new DataOutputBuffer();
        before.write(dob);

        DataInputBuffer dib = new DataInputBuffer();
        dib.reset(dob.getData(), dob.getLength());

        Writable after = (Writable) before.getClass().newInstance();
        if (conf != null) {
            ((Configurable) after).setConf(conf);
        }
        after.readFields(dib);
        return after;
    }

}