org.apache.crunch.MaterializeToMapIT.java Source code

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Here is the source code for org.apache.crunch.MaterializeToMapIT.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.crunch;

import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.io.Serializable;
import java.util.Map;

import org.apache.commons.lang.SerializationUtils;
import org.apache.crunch.impl.mem.MemPipeline;
import org.apache.crunch.impl.mr.MRPipeline;
import org.apache.crunch.test.TemporaryPath;
import org.apache.crunch.test.TemporaryPaths;
import org.apache.crunch.types.PTypeFamily;
import org.junit.Rule;
import org.junit.Test;

import com.google.common.collect.ImmutableList;

public class MaterializeToMapIT {

    static final ImmutableList<Pair<Integer, String>> kvPairs = ImmutableList.of(Pair.of(0, "a"), Pair.of(1, "b"),
            Pair.of(2, "c"), Pair.of(3, "e"));

    public static void assertMatches(Map<Integer, String> m) {
        for (Map.Entry<Integer, String> entry : m.entrySet()) {
            assertEquals(kvPairs.get(entry.getKey()).second(), entry.getValue());
        }
    }

    @Test
    public void testMemMaterializeToMap() {
        assertMatches(MemPipeline.tableOf(kvPairs).materializeToMap());
    }

    private static class Set1Mapper extends MapFn<String, Pair<Integer, String>> {
        @Override
        public Pair<Integer, String> map(String input) {

            int k = -1;
            if (input.equals("a")) {
                k = 0;
            } else if (input.equals("b")) {
                k = 1;
            } else if (input.equals("c")) {
                k = 2;
            } else if (input.equals("e")) {
                k = 3;
            }
            return Pair.of(k, input);
        }
    }

    @Rule
    public TemporaryPath tmpDir = TemporaryPaths.create();

    @Test
    public void testMRMaterializeToMap() throws IOException {
        Pipeline p = new MRPipeline(MaterializeToMapIT.class, tmpDir.getDefaultConfiguration());
        String inputFile = tmpDir.copyResourceFileName("set1.txt");
        PCollection<String> c = p.readTextFile(inputFile);
        PTypeFamily tf = c.getTypeFamily();
        PTable<Integer, String> t = c.parallelDo(new Set1Mapper(), tf.tableOf(tf.ints(), tf.strings()));
        Map<Integer, String> m = t.materializeToMap();
        assertMatches(m);
        Map<Integer, String> mclone = (Map<Integer, String>) SerializationUtils.clone((Serializable) m);
        assertMatches(mclone);
    }

}