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file to map article (#11838)

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* file to map article

* add aggregateByKeys method
This commit is contained in:
Kai Yuan
2022-03-01 02:44:16 +01:00
committed by GitHub
parent b38f226170
commit f11bd7da0f
3 changed files with 155 additions and 0 deletions
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66
core-java-modules/core-java-io-4/src/test/java/com/baeldung/filetomap/FileToHashMapUnitTest.java Normal file
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package com.baeldung.filetomap;
import org.junit.Before;
import org.junit.Test;
import java.net.URISyntaxException;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.assertj.core.api.Assertions.assertThat;
public class FileToHashMapUnitTest {
private String filePath;
private static final Map<String, String> EXPECTED_MAP_DISCARD = Stream.of(new String[][]{
{"title", "The Lord of the Rings: The Return of the King"},
{"director", "Peter Jackson"},
{"actor", "Sean Astin"}
}).collect(Collectors.toMap(data -> data[0], data -> data[1]));
private static final Map<String, String> EXPECTED_MAP_OVERWRITE = Stream.of(new String[][]{
{"title", "The Lord of the Rings: The Return of the King"},
{"director", "Peter Jackson"},
{"actor", "Ian McKellen"}
}).collect(Collectors.toMap(data -> data[0], data -> data[1]));
private static final Map<String, List<String>> EXPECTED_MAP_AGGREGATE = Stream.of(new String[][]{
{"title", "The Lord of the Rings: The Return of the King"},
{"director", "Peter Jackson"},
{"actor", "Sean Astin", "Ian McKellen"}
}).collect(Collectors.toMap(arr -> arr[0], arr -> Arrays.asList(Arrays.copyOfRange(arr, 1, arr.length))));
@Before
public void setPath() throws URISyntaxException {
if (filePath == null) {
filePath = Paths.get(ClassLoader.getSystemResource("filetomap/theLordOfRings.txt").toURI()).toString();
}
}
@Test
public void givenInputFile_whenInvokeByBufferedReaderPriorToJava8_shouldGetExpectedMap() {
Map<String, String> mapOverwrite = FileToHashMap.byBufferedReader(filePath, FileToHashMap.DupKeyOption.OVERWRITE);
Map<String, String> mapDiscard = FileToHashMap.byBufferedReader(filePath, FileToHashMap.DupKeyOption.DISCARD);
assertThat(mapOverwrite).isEqualTo(EXPECTED_MAP_OVERWRITE);
assertThat(mapDiscard).isEqualTo(EXPECTED_MAP_DISCARD);
}
@Test
public void givenInputFile_whenInvokeByStream_shouldGetExpectedMap() {
Map<String, String> mapOverwrite = FileToHashMap.byStream(filePath, FileToHashMap.DupKeyOption.OVERWRITE);
Map<String, String> mapDiscard = FileToHashMap.byStream(filePath, FileToHashMap.DupKeyOption.DISCARD);
assertThat(mapOverwrite).isEqualTo(EXPECTED_MAP_OVERWRITE);
assertThat(mapDiscard).isEqualTo(EXPECTED_MAP_DISCARD);
}
@Test
public void givenInputFile_whenInvokeAggregateByKeys_shouldGetExpectedMap() {
Map<String, List<String>> mapAgg = FileToHashMap.aggregateByKeys(filePath);
assertThat(mapAgg).isEqualTo(EXPECTED_MAP_AGGREGATE);
}
}

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core-java-modules/core-java-io-4/src/test/resources/filetomap/theLordOfRings.txt Normal file
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title:The Lord of the Rings: The Return of the King
director:Peter Jackson
actor:Sean Astin
actor:Ian McKellen
Gandalf and Aragorn lead the World of Men against Sauron's
army to draw his gaze from Frodo and Sam as they approach Mount Doom with the One Ring.