Apache Commons Collections OrderedMap user:igallegosagas email:ignaciogallego@gmail.com (#2131)
* Test class that shows OrderedMap methods and implementations * Test class that shows OrderedMap methods and implementations
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Blue Montag Software
KevinGilmore
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package com.baeldung.commons.collections.orderedmap;
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import static org.junit.Assert.assertEquals;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.commons.collections4.OrderedMap;
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import org.apache.commons.collections4.OrderedMapIterator;
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import org.apache.commons.collections4.map.LinkedMap;
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import org.apache.commons.collections4.map.ListOrderedMap;
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import org.junit.Before;
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import org.junit.Test;
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public class OrderedMapUnitTest {
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private String[] names = { "Emily", "Mathew", "Rose", "John", "Anna" };
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private Integer[] ages = { 37, 28, 40, 36, 21 };
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private int RUNNERS_COUNT = names.length;
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private OrderedMap<String, Integer> runnersLinkedMap;
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private OrderedMap<String, Integer> runnersListOrderedMap;
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@Before
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public void createRunners() {
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// First implementation: ListOrderedMap
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this.runnersListOrderedMap = new ListOrderedMap<String, Integer>();
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this.loadOrderedMapOfRunners(this.runnersListOrderedMap);
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// Second implementation: LinkedMap
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this.runnersLinkedMap = new LinkedMap<String, Integer>();
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this.loadOrderedMapOfRunners(this.runnersLinkedMap);
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}
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private void loadOrderedMapOfRunners(OrderedMap<String, Integer> runners) {
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for (int i = 0; i < RUNNERS_COUNT; i++) {
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runners.put(this.names[i], this.ages[i]);
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}
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}
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@Test
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public void givenALinkedMap_whenIteratedWithMapIterator_thenPreservesOrder() {
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// Tests that the order in map iterator is the same
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// as defined in the constant arrays of names and ages:
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OrderedMapIterator<String, Integer> runnersIterator = this.runnersLinkedMap.mapIterator();
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for (int i = 0; runnersIterator.hasNext(); i++) {
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runnersIterator.next();
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assertEquals(runnersIterator.getKey(), this.names[i]);
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assertEquals(runnersIterator.getValue(), this.ages[i]);
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}
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}
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@Test
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public void givenAListOrderedMap_whenIteratedWithMapIterator_thenPreservesOrder() {
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// Tests that the order in map iterator is the same
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// as defined in the constant arrays of names and ages:
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OrderedMapIterator<String, Integer> runnersIterator = this.runnersListOrderedMap.mapIterator();
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for (int i = 0; runnersIterator.hasNext(); i++) {
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runnersIterator.next();
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assertEquals(runnersIterator.getKey(), this.names[i]);
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assertEquals(runnersIterator.getValue(), this.ages[i]);
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}
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}
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@Test
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public void givenALinkedMap_whenIteratedForwards_thenPreservesOrder() {
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// Tests that the order in the forward iteration is the same
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// as defined in the constant arrays of names and ages
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String name = this.runnersLinkedMap.firstKey();
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for (int i = 0; name != null; i++) {
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assertEquals(name, this.names[i]);
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name = this.runnersLinkedMap.nextKey(name);
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}
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}
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@Test
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public void givenAListOrderedMap_whenIteratedForwards_thenPreservesOrder() {
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// Tests that the order in the forward iteration is the same
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// as defined in the constant arrays of names and ages
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String name = this.runnersListOrderedMap.firstKey();
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for (int i = 0; name != null; i++) {
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assertEquals(name, this.names[i]);
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name = this.runnersListOrderedMap.nextKey(name);
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}
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}
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@Test
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public void givenALinkedMap_whenIteratedBackwards_thenPreservesOrder() {
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// Tests that the order in the backwards iteration is the same
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// as defined in the constant arrays of names and ages
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String name = this.runnersLinkedMap.lastKey();
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for (int i = RUNNERS_COUNT - 1; name != null; i--) {
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assertEquals(name, this.names[i]);
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name = this.runnersLinkedMap.previousKey(name);
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}
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}
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@Test
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public void givenAListOrderedMap_whenIteratedBackwards_thenPreservesOrder() {
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// Tests that the order in the backwards iteration is the same
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// as defined in the constant arrays of names and ages
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String name = this.runnersListOrderedMap.lastKey();
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for (int i = RUNNERS_COUNT - 1; name != null; i--) {
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assertEquals(name, this.names[i]);
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name = this.runnersListOrderedMap.previousKey(name);
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}
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}
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@Test
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public void givenALinkedMap_whenObjectIsSearched_thenMatchesConstantArray() {
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assertEquals(ages[4], this.runnersLinkedMap.get("Anna"));
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}
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@Test
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public void givenALinkedMap_whenConvertedToList_thenMatchesKeySet() {
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// Casting the OrderedMap to a LinkedMap we can use asList() method
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LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
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List<String> listKeys = new ArrayList<String>();
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listKeys.addAll(this.runnersLinkedMap.keySet());
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List<String> linkedMap = lmap.asList();
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assertEquals(listKeys, linkedMap);
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}
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@Test
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public void givenALinkedMap_whenSearchByIndexIsUsed_thenMatchesConstantArray() {
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LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
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for (int i = 0; i < RUNNERS_COUNT; i++) {
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// accessed by index:
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String name = lmap.get(i);
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assertEquals(name, this.names[i]);
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// index of key concides with position in array
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assertEquals(lmap.indexOf(this.names[i]), i);
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}
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}
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@Test
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public void givenALinkedMap_whenElementRemoved_thenSizeDecrease() {
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LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
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Integer johnAge = lmap.remove("John");// by object
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assertEquals(johnAge, new Integer(36));
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assertEquals(lmap.size(), RUNNERS_COUNT - 1);
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Integer emilyAge = lmap.remove(0);// by index
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assertEquals(emilyAge, new Integer(37));
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assertEquals(lmap.size(), RUNNERS_COUNT - 2);
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}
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@Test
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public void givenAListOrderedMap_whenObjectIsSearched_thenMatchesConstantArray() {
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assertEquals(ages[4], this.runnersListOrderedMap.get("Anna"));
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}
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@Test
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public void givenAListOrderedMap_whenConvertedToList_thenMatchesKeySet() {
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ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
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List<String> listKeys = new ArrayList<String>();
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listKeys.addAll(this.runnersListOrderedMap.keySet());
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List<String> lomapList = lomap.asList();
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assertEquals(listKeys, lomapList);
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}
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@Test
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public void givenAListOrderedMap_whenSearchByIndexIsUsed_thenMatchesConstantArray() {
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ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
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for (int i = 0; i < RUNNERS_COUNT; i++) {
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// accessed by index:
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String name = lomap.get(i);
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assertEquals(name, this.names[i]);
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// index of key concides with position in array
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assertEquals(lomap.indexOf(this.names[i]), i);
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}
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}
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@Test
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public void givenAListOrderedMap_whenElementRemoved_thenSizeDecrease() {
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ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
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Integer johnAge = lomap.remove("John");// by object
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assertEquals(johnAge, new Integer(36));
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assertEquals(lomap.size(), RUNNERS_COUNT - 1);
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Integer emilyAge = lomap.remove(0);// by index
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assertEquals(emilyAge, new Integer(37));
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assertEquals(lomap.size(), RUNNERS_COUNT - 2);
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}
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}
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