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BAEL-2018 Moved to core-java-collections (#4796)

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This commit is contained in:
Predrag Maric
2018-07-23 09:02:10 +02:00
committed by GitHub
parent ef5f511fb9
commit 717bd1d48d
4 changed files with 13 additions and 12 deletions
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27
core-java-collections/src/main/java/com/baeldung/convertlisttomap/Animal.java Normal file
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package com.baeldung.convertlisttomap;
public class Animal {
private int id;
private String name;
public Animal(int id, String name) {
this.id = id;
this.setName(name);
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

42
core-java-collections/src/main/java/com/baeldung/convertlisttomap/ConvertListToMapService.java Normal file
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package com.baeldung.convertlisttomap;
import com.google.common.collect.Maps;
import org.apache.commons.collections4.MapUtils;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
public class ConvertListToMapService {
public Map<Integer, Animal> convertListBeforeJava8(List<Animal> list) {
Map<Integer, Animal> map = new HashMap<>();
for (Animal animal : list) {
map.put(animal.getId(), animal);
}
return map;
}
public Map<Integer, Animal> convertListAfterJava8(List<Animal> list) {
Map<Integer, Animal> map = list.stream().collect(Collectors.toMap(Animal::getId, animal -> animal));
return map;
}
public Map<Integer, Animal> convertListWithGuava(List<Animal> list) {
Map<Integer, Animal> map = Maps.uniqueIndex(list, Animal::getId);
return map;
}
public Map<Integer, Animal> convertListWithApacheCommons(List<Animal> list) {
Map<Integer, Animal> map = new HashMap<>();
MapUtils.populateMap(map, list, Animal::getId);
return map;
}
}

68
core-java-collections/src/test/java/com/baeldung/convertlisttomap/ConvertListToMapServiceUnitTest.java Normal file
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package com.baeldung.convertlisttomap;
import org.junit.Before;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.containsInAnyOrder;
public class ConvertListToMapServiceUnitTest {
List<Animal> list;
private ConvertListToMapService convertListService;
@Before
public void init() {
this.convertListService = new ConvertListToMapService();
this.list = new ArrayList<>();
Animal cat = new Animal(1, "Cat");
list.add(cat);
Animal dog = new Animal(2, "Dog");
list.add(dog);
Animal pig = new Animal(3, "Pig");
list.add(pig);
Animal cow = new Animal(4, "Cow");
list.add(cow);
Animal goat = new Animal(5, "Goat");
list.add(goat);
}
@Test
public void givenAList_whenConvertBeforeJava8_thenReturnMapWithTheSameElements() {
Map<Integer, Animal> map = convertListService.convertListBeforeJava8(list);
assertThat(map.values(), containsInAnyOrder(list.toArray()));
}
@Test
public void givenAList_whenConvertAfterJava8_thenReturnMapWithTheSameElements() {
Map<Integer, Animal> map = convertListService.convertListAfterJava8(list);
assertThat(map.values(), containsInAnyOrder(list.toArray()));
}
@Test
public void givenAList_whenConvertWithGuava_thenReturnMapWithTheSameElements() {
Map<Integer, Animal> map = convertListService.convertListWithGuava(list);
assertThat(map.values(), containsInAnyOrder(list.toArray()));
}
@Test
public void givenAList_whenConvertWithApacheCommons_thenReturnMapWithTheSameElements() {
Map<Integer, Animal> map = convertListService.convertListWithApacheCommons(list);
assertThat(map.values(), containsInAnyOrder(list.toArray()));
}
}

68
core-java-collections/src/test/java/com/baeldung/convertlisttomap/ConvertListWithDiplicatedIdToMapServiceUnitTest.java Normal file
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package com.baeldung.convertlisttomap;
import org.junit.Before;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasItem;
import static org.hamcrest.Matchers.hasSize;
public class ConvertListWithDiplicatedIdToMapServiceUnitTest {
List<Animal> duplicatedIdList;
private ConvertListToMapService convertListService = new ConvertListToMapService();
@Before
public void init() {
this.duplicatedIdList = new ArrayList<>();
Animal cat = new Animal(1, "Cat");
duplicatedIdList.add(cat);
Animal dog = new Animal(2, "Dog");
duplicatedIdList.add(dog);
Animal pig = new Animal(3, "Pig");
duplicatedIdList.add(pig);
Animal cow = new Animal(4, "Cow");
duplicatedIdList.add(cow);
Animal goat = new Animal(4, "Goat");
duplicatedIdList.add(goat);
}
@Test
public void givenADupIdList_whenConvertBeforeJava8_thenReturnMapWithRewrittenElement() {
Map<Integer, Animal> map = convertListService.convertListBeforeJava8(duplicatedIdList);
assertThat(map.values(), hasSize(4));
assertThat(map.values(), hasItem(duplicatedIdList.get(4)));
}
@Test
public void givenADupIdList_whenConvertWithApacheCommons_thenReturnMapWithRewrittenElement() {
Map<Integer, Animal> map = convertListService.convertListWithApacheCommons(duplicatedIdList);
assertThat(map.values(), hasSize(4));
assertThat(map.values(), hasItem(duplicatedIdList.get(4)));
}
@Test(expected = IllegalStateException.class)
public void givenADupIdList_whenConvertAfterJava8_thenException() {
convertListService.convertListAfterJava8(duplicatedIdList);
}
@Test(expected = IllegalArgumentException.class)
public void givenADupIdList_whenConvertWithGuava_thenException() {
convertListService.convertListWithGuava(duplicatedIdList);
}
}