From 03e852e74753f9eccb3f53dba106a8dfcddb21b1 Mon Sep 17 00:00:00 2001 From: DOHA Date: Sat, 8 Dec 2018 13:27:17 +0200 Subject: [PATCH] compare hashmap --- .../compare/HashMapComparisonUnitTest.java | 227 ++++++++++++++++++ 1 file changed, 227 insertions(+) create mode 100644 java-collections-maps/src/test/java/com/baeldung/java/map/compare/HashMapComparisonUnitTest.java diff --git a/java-collections-maps/src/test/java/com/baeldung/java/map/compare/HashMapComparisonUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/java/map/compare/HashMapComparisonUnitTest.java new file mode 100644 index 0000000000..c9a6b953ef --- /dev/null +++ b/java-collections-maps/src/test/java/com/baeldung/java/map/compare/HashMapComparisonUnitTest.java @@ -0,0 +1,227 @@ +package com.baeldung.java.map.compare; + +import static org.hamcrest.MatcherAssert.assertThat; +import static org.hamcrest.collection.IsMapContaining.hasEntry; +import static org.hamcrest.collection.IsMapContaining.hasKey; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertFalse; +import static org.junit.Assert.assertTrue; + +import java.util.Arrays; +import java.util.HashMap; +import java.util.Map; +import java.util.stream.Collectors; + +import org.junit.Before; +import org.junit.Test; + +import com.google.common.base.Equivalence; +import com.google.common.collect.MapDifference; +import com.google.common.collect.MapDifference.ValueDifference; +import com.google.common.collect.Maps; + +public class HashMapComparisonUnitTest { + + Map asiaCapital1; + Map asiaCapital2; + Map asiaCapital3; + + Map asiaCity1; + Map asiaCity2; + Map asiaCity3; + + @Before + public void setup(){ + asiaCapital1 = new HashMap(); + asiaCapital1.put("Japan", "Tokyo"); + asiaCapital1.put("South Korea", "Seoul"); + + asiaCapital2 = new HashMap(); + asiaCapital2.put("South Korea", "Seoul"); + asiaCapital2.put("Japan", "Tokyo"); + + asiaCapital3 = new HashMap(); + asiaCapital3.put("Japan", "Tokyo"); + asiaCapital3.put("China", "Beijing"); + + asiaCity1 = new HashMap(); + asiaCity1.put("Japan", new String[] { "Tokyo", "Osaka" }); + asiaCity1.put("South Korea", new String[] { "Seoul", "Busan" }); + + asiaCity2 = new HashMap(); + asiaCity2.put("South Korea", new String[] { "Seoul", "Busan" }); + asiaCity2.put("Japan", new String[] { "Tokyo", "Osaka" }); + + asiaCity3 = new HashMap(); + asiaCity3.put("Japan", new String[] { "Tokyo", "Osaka" }); + asiaCity3.put("China", new String[] { "Beijing", "Hong Kong" }); + } + + @Test + public void whenCompareTwoHashMapsUsingEquals_thenSuccess() { + assertTrue(asiaCapital1.equals(asiaCapital2)); + assertFalse(asiaCapital1.equals(asiaCapital3)); + } + + @Test + public void whenCompareTwoHashMapsWithArrayValuesUsingEquals_thenFail() { + assertFalse(asiaCity1.equals(asiaCity2)); + } + + @Test + public void whenCompareTwoHashMapsUsingStreamAPI_thenSuccess() { + assertTrue(areEqual(asiaCapital1, asiaCapital2)); + assertFalse(areEqual(asiaCapital1, asiaCapital3)); + } + + @Test + public void whenCompareTwoHashMapsWithArrayValuesUsingStreamAPI_thenSuccess() { + assertTrue(areEqualWithArrayValue(asiaCity1, asiaCity2)); + assertFalse(areEqualWithArrayValue(asiaCity1, asiaCity3)); + } + + @Test + public void whenCompareTwoHashMapKeys_thenSuccess() { + assertTrue(asiaCapital1.keySet().equals(asiaCapital2.keySet())); + assertFalse(asiaCapital1.keySet().equals(asiaCapital3.keySet())); + } + + @Test + public void whenCompareTwoHashMapKeyValuesUsingStreamAPI_thenSuccess() { + Map asiaCapital3 = new HashMap(); + asiaCapital3.put("Japan", "Tokyo"); + asiaCapital3.put("South Korea", "Seoul"); + asiaCapital3.put("China", "Beijing"); + + Map asiaCapital4 = new HashMap(); + asiaCapital4.put("South Korea", "Seoul"); + asiaCapital4.put("Japan", "Osaka"); + asiaCapital4.put("China", "Beijing"); + + Map result = areEqualKeys(asiaCapital3, asiaCapital4); + assertEquals(3, result.size()); + assertThat(result, hasEntry("Japan", false)); + assertThat(result, hasEntry("South Korea", true)); + assertThat(result, hasEntry("China", true)); + } + + @Test + public void givenDifferentMaps_whenGetDiffUsingGuava_thenSuccess() { + Map asia1 = new HashMap(); + asia1.put("Japan", "Tokyo"); + asia1.put("South Korea", "Seoul"); + asia1.put("India", "New Delhi"); + + Map asia2 = new HashMap(); + asia2.put("Japan", "Tokyo"); + asia2.put("China", "Beijing"); + asia2.put("India", "Delhi"); + + MapDifference diff = Maps.difference(asia1, asia2); + Map> entriesDiffering = diff.entriesDiffering(); + + assertFalse(diff.areEqual()); + assertEquals(1, entriesDiffering.size()); + assertThat(entriesDiffering, hasKey("India")); + assertEquals("New Delhi", entriesDiffering.get("India").leftValue()); + assertEquals("Delhi", entriesDiffering.get("India").rightValue()); + } + + @Test + public void givenDifferentMaps_whenGetEntriesOnOneSideUsingGuava_thenSuccess() { + Map asia1 = new HashMap(); + asia1.put("Japan", "Tokyo"); + asia1.put("South Korea", "Seoul"); + asia1.put("India", "New Delhi"); + + Map asia2 = new HashMap(); + asia2.put("Japan", "Tokyo"); + asia2.put("China", "Beijing"); + asia2.put("India", "Delhi"); + + MapDifference diff = Maps.difference(asia1, asia2); + Map entriesOnlyOnRight = diff.entriesOnlyOnRight(); + assertEquals(1, entriesOnlyOnRight.size()); + assertThat(entriesOnlyOnRight, hasEntry("China", "Beijing")); + + Map entriesOnlyOnLeft = diff.entriesOnlyOnLeft(); + assertEquals(1, entriesOnlyOnLeft.size()); + assertThat(entriesOnlyOnLeft, hasEntry("South Korea", "Seoul")); + } + + @Test + public void givenDifferentMaps_whenGetCommonEntriesUsingGuava_thenSuccess() { + Map asia1 = new HashMap(); + asia1.put("Japan", "Tokyo"); + asia1.put("South Korea", "Seoul"); + asia1.put("India", "New Delhi"); + + Map asia2 = new HashMap(); + asia2.put("Japan", "Tokyo"); + asia2.put("China", "Beijing"); + asia2.put("India", "Delhi"); + + MapDifference diff = Maps.difference(asia1, asia2); + Map entriesInCommon = diff.entriesInCommon(); + + assertEquals(1, entriesInCommon.size()); + assertThat(entriesInCommon, hasEntry("Japan", "Tokyo")); + } + + @Test + public void givenSimilarMapsWithArrayValue_whenCompareUsingGuava_thenFail() { + MapDifference diff = Maps.difference(asiaCity1, asiaCity2); + assertFalse(diff.areEqual()); + } + + @Test + public void givenSimilarMapsWithArrayValue_whenCompareUsingGuavaEquivalence_thenSuccess() { + Equivalence eq = new Equivalence() { + @Override + protected boolean doEquivalent(String[] a, String[] b) { + return Arrays.equals(a, b); + } + + @Override + protected int doHash(String[] value) { + return value.hashCode(); + } + }; + + MapDifference diff = Maps.difference(asiaCity1, asiaCity2, eq); + assertTrue(diff.areEqual()); + + diff = Maps.difference(asiaCity1, asiaCity3, eq); + assertFalse(diff.areEqual()); + } + + // =========================================================================== + + private boolean areEqual(Map first, Map second) { + if (first.size() != second.size()) { + return false; + } + + return first.entrySet() + .stream() + .allMatch(e -> e.getValue() + .equals(second.get(e.getKey()))); + } + + private boolean areEqualWithArrayValue(Map first, Map second) { + if (first.size() != second.size()) { + return false; + } + + return first.entrySet() + .stream() + .allMatch(e -> Arrays.equals(e.getValue(), second.get(e.getKey()))); + } + + private Map areEqualKeys(Map first, Map second) { + return first.entrySet() + .stream() + .collect(Collectors.toMap(e -> e.getKey(), e -> e.getValue().equals(second.get(e.getKey())))); + } + +}