/*
* 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.beam.sdk.transforms;
import static org.junit.Assert.assertEquals;
import java.util.Arrays;
import java.util.List;
import org.apache.beam.sdk.coders.StringUtf8Coder;
import org.apache.beam.sdk.testing.NeedsRunner;
import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.TypeDescriptor;
import org.junit.Rule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for ExtractKeys transform.
*/
@RunWith(JUnit4.class)
public class WithKeysTest {
static final String[] COLLECTION = new String[] {
"a",
"aa",
"b",
"bb",
"bbb"
};
static final List<KV<Integer, String>> WITH_KEYS = Arrays.asList(
KV.of(1, "a"),
KV.of(2, "aa"),
KV.of(1, "b"),
KV.of(2, "bb"),
KV.of(3, "bbb")
);
static final List<KV<Integer, String>> WITH_CONST_KEYS = Arrays.asList(
KV.of(100, "a"),
KV.of(100, "aa"),
KV.of(100, "b"),
KV.of(100, "bb"),
KV.of(100, "bbb")
);
@Rule
public final TestPipeline p = TestPipeline.create();
@Test
@Category(NeedsRunner.class)
public void testExtractKeys() {
PCollection<String> input =
p.apply(Create.of(Arrays.asList(COLLECTION)).withCoder(
StringUtf8Coder.of()));
PCollection<KV<Integer, String>> output = input.apply(WithKeys.of(
new LengthAsKey()));
PAssert.that(output)
.containsInAnyOrder(WITH_KEYS);
p.run();
}
@Test
@Category(NeedsRunner.class)
public void testConstantKeys() {
PCollection<String> input =
p.apply(Create.of(Arrays.asList(COLLECTION)).withCoder(
StringUtf8Coder.of()));
PCollection<KV<Integer, String>> output =
input.apply(WithKeys.<Integer, String>of(100));
PAssert.that(output)
.containsInAnyOrder(WITH_CONST_KEYS);
p.run();
}
@Test
public void testWithKeysGetName() {
assertEquals("WithKeys", WithKeys.<Integer, String>of(100).getName());
}
@Test
@Category(NeedsRunner.class)
public void testWithKeysWithUnneededWithKeyTypeSucceeds() {
PCollection<String> input =
p.apply(Create.of(Arrays.asList(COLLECTION)).withCoder(
StringUtf8Coder.of()));
PCollection<KV<Integer, String>> output =
input.apply(WithKeys.of(new LengthAsKey()).withKeyType(TypeDescriptor.of(Integer.class)));
PAssert.that(output).containsInAnyOrder(WITH_KEYS);
p.run();
}
/**
* Key a value by its length.
*/
public static class LengthAsKey
implements SerializableFunction<String, Integer> {
@Override
public Integer apply(String value) {
return value.length();
}
}
}