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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.commons.io.function;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.fail;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.function.BiFunction;
import java.util.function.BinaryOperator;
import java.util.stream.Stream;
import org.apache.commons.io.file.PathUtils;
import org.junit.jupiter.api.Test;
/**
* Tests {@link IOBinaryOperator}.
*/
public class IOBinaryOperatorStreamTest {
private static final IOBinaryOperator<Path> MIN_BY_IO_BO = IOBinaryOperator.minBy(IOComparatorTest.REAL_PATH_COMP);
private static final BinaryOperator<Path> MIN_BY_BO = MIN_BY_IO_BO.asBinaryOperator();
private static final IOBinaryOperator<Path> MAX_BY_IO_BO = IOBinaryOperator.maxBy(IOComparatorTest.REAL_PATH_COMP);
private static final BinaryOperator<Path> MAX_BY_BO = MAX_BY_IO_BO.asBinaryOperator();
private static final IOBinaryOperator<Path> REAL_PATH_IO_BO = (t, u) -> t.toRealPath();
private static final BinaryOperator<Path> REAL_PATH_BO = REAL_PATH_IO_BO.asBinaryOperator();
@Test
public void testAsBinaryOperator() {
assertThrows(UncheckedIOException.class,
() -> Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A).reduce(TestUtils.<Path>throwingIOBinaryOperator().asBinaryOperator()).get());
assertEquals(TestConstants.ABS_PATH_A, Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A).reduce(MAX_BY_BO).get());
assertEquals(TestConstants.ABS_PATH_A, Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A).reduce(MIN_BY_BO).get());
}
/**
*/
@Test
public void testMaxBy() {
assertEquals(TestConstants.ABS_PATH_A, Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A).reduce(MAX_BY_BO).get());
// in-line lambda ok:
final IOBinaryOperator<Path> binIoOp = IOBinaryOperator.maxBy((t, u) -> t.toRealPath().compareTo(u));
final BiFunction<Path, Path, Path> asBiFunction = binIoOp.asBiFunction();
final BinaryOperator<Path> asBinaryOperator = binIoOp.asBinaryOperator();
assertEquals(TestConstants.ABS_PATH_B, asBiFunction.apply(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_B));
assertEquals(TestConstants.ABS_PATH_B, asBinaryOperator.apply(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_B));
//
assertEquals(TestConstants.ABS_PATH_A, Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A).reduce(asBinaryOperator).get());
assertEquals(TestConstants.ABS_PATH_B, Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_B).reduce(asBinaryOperator).get());
assertEquals(TestConstants.ABS_PATH_B, Stream.of(TestConstants.ABS_PATH_B, TestConstants.ABS_PATH_A).reduce(asBinaryOperator).get());
}
@Test
public void testMinBy() {
assertEquals(TestConstants.ABS_PATH_A, Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A).reduce(MIN_BY_BO).get());
// in-line lambda ok:
final IOBinaryOperator<Path> binIoOp = IOBinaryOperator.minBy((t, u) -> t.toRealPath().compareTo(u));
final BiFunction<Path, Path, Path> asBiFunction = binIoOp.asBiFunction();
final BinaryOperator<Path> asBinaryOperator = binIoOp.asBinaryOperator();
assertEquals(TestConstants.ABS_PATH_A, asBiFunction.apply(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_B));
assertEquals(TestConstants.ABS_PATH_A, asBinaryOperator.apply(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_B));
//
assertEquals(TestConstants.ABS_PATH_A, Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A).reduce(asBinaryOperator).get());
assertEquals(TestConstants.ABS_PATH_A, Stream.of(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_B).reduce(asBinaryOperator).get());
assertEquals(TestConstants.ABS_PATH_A, Stream.of(TestConstants.ABS_PATH_B, TestConstants.ABS_PATH_A).reduce(asBinaryOperator).get());
}
@Test
public void testReduce() throws IOException {
// A silly example to pass in a IOBinaryOperator.
final Path current = PathUtils.current();
final Path expected;
try (Stream<Path> stream = Files.list(current)) {
expected = stream.reduce((t, u) -> {
try {
return t.toRealPath();
} catch (final IOException e) {
return fail(e);
}
}).get();
}
try (Stream<Path> stream = Files.list(current)) {
assertEquals(expected, stream.reduce(REAL_PATH_BO).get());
}
}
}
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