/*
* 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.apache.beam.sdk.transforms.display.DisplayDataMatchers.hasDisplayItem;
import static org.hamcrest.MatcherAssert.assertThat;
import java.io.Serializable;
import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.testing.ValidatesRunner;
import org.apache.beam.sdk.transforms.display.DisplayData;
import org.apache.beam.sdk.values.PCollection;
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 {@link Filter}.
*/
@RunWith(JUnit4.class)
public class FilterTest implements Serializable {
static class TrivialFn implements SerializableFunction<Integer, Boolean> {
private final Boolean returnVal;
TrivialFn(Boolean returnVal) {
this.returnVal = returnVal;
}
@Override
public Boolean apply(Integer elem) {
return this.returnVal;
}
}
static class EvenFn implements SerializableFunction<Integer, Boolean> {
@Override
public Boolean apply(Integer elem) {
return elem % 2 == 0;
}
}
@Rule
public final TestPipeline p = TestPipeline.create();
@Test
@Category(ValidatesRunner.class)
public void testIdentityFilterByPredicate() {
PCollection<Integer> output = p
.apply(Create.of(591, 11789, 1257, 24578, 24799, 307))
.apply(Filter.by(new TrivialFn(true)));
PAssert.that(output).containsInAnyOrder(591, 11789, 1257, 24578, 24799, 307);
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testNoFilterByPredicate() {
PCollection<Integer> output = p
.apply(Create.of(1, 2, 4, 5))
.apply(Filter.by(new TrivialFn(false)));
PAssert.that(output).empty();
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testFilterByPredicate() {
PCollection<Integer> output = p
.apply(Create.of(1, 2, 3, 4, 5, 6, 7))
.apply(Filter.by(new EvenFn()));
PAssert.that(output).containsInAnyOrder(2, 4, 6);
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testFilterLessThan() {
PCollection<Integer> output = p
.apply(Create.of(1, 2, 3, 4, 5, 6, 7))
.apply(Filter.lessThan(4));
PAssert.that(output).containsInAnyOrder(1, 2, 3);
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testFilterGreaterThan() {
PCollection<Integer> output = p
.apply(Create.of(1, 2, 3, 4, 5, 6, 7))
.apply(Filter.greaterThan(4));
PAssert.that(output).containsInAnyOrder(5, 6, 7);
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testFilterLessThanEq() {
PCollection<Integer> output = p
.apply(Create.of(1, 2, 3, 4, 5, 6, 7))
.apply(Filter.lessThanEq(4));
PAssert.that(output).containsInAnyOrder(1, 2, 3, 4);
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testFilterGreaterThanEq() {
PCollection<Integer> output = p
.apply(Create.of(1, 2, 3, 4, 5, 6, 7))
.apply(Filter.greaterThanEq(4));
PAssert.that(output).containsInAnyOrder(4, 5, 6, 7);
p.run();
}
@Test
@Category(ValidatesRunner.class)
public void testFilterEqual() {
PCollection<Integer> output = p
.apply(Create.of(1, 2, 3, 4, 5, 6, 7))
.apply(Filter.equal(4));
PAssert.that(output).containsInAnyOrder(4);
p.run();
}
@Test
public void testDisplayData() {
assertThat(DisplayData.from(Filter.lessThan(123)), hasDisplayItem("predicate", "x < 123"));
assertThat(DisplayData.from(Filter.lessThanEq(234)), hasDisplayItem("predicate", "x ≤ 234"));
assertThat(DisplayData.from(Filter.greaterThan(345)), hasDisplayItem("predicate", "x > 345"));
assertThat(DisplayData.from(Filter.greaterThanEq(456)), hasDisplayItem("predicate", "x ≥ 456"));
assertThat(DisplayData.from(Filter.equal(567)), hasDisplayItem("predicate", "x == 567"));
}
}