DATACMNS-900 - Added equals(…) and hashCode() methods for ExampleMatcher utility classes.

We now provide equals(…) and hashCode() methods for GenericPropertyMatcher, PropertySpecifier and PropertySpecifiers so that they can be compared and used in sets.

Original pull request: #175.

Author: mp911de

src/main/java/org/springframework/data/domain/ExampleMatcher.java

@@ -337,6 +337,7 @@ public static interface MatcherConfigurer<T> {
 	 *
 	 * @author Mark Paluch
 	 */
+	@EqualsAndHashCode
 	public static class GenericPropertyMatcher {
 
 		StringMatcher stringMatcher = null;
@@ -634,10 +635,12 @@ public Object convert(Object source) {
 	 * Define specific property handling for a Dot-Path.
 	 *
 	 * @author Christoph Strobl
+	 * @author Mark Paluch
 	 * @since 1.12
 	 */
 	@FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE)
 	@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
+	@EqualsAndHashCode
 	public static class PropertySpecifier {
 
 		String path;
@@ -746,8 +749,10 @@ public Object transformValue(Object source) {
 	 * Define specific property handling for Dot-Paths.
 	 *
 	 * @author Christoph Strobl
+	 * @author Mark Paluch
 	 * @since 1.12
 	 */
+	@EqualsAndHashCode
 	public static class PropertySpecifiers {
 
 		private final Map<String, PropertySpecifier> propertySpecifiers = new LinkedHashMap<String, PropertySpecifier>();

src/test/java/org/springframework/data/domain/ExampleMatcherUnitTests.java

@@ -22,8 +22,7 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.springframework.data.domain.ExampleMatcher.NullHandler;
-import org.springframework.data.domain.ExampleMatcher.StringMatcher;
+import org.springframework.data.domain.ExampleMatcher.*;
 
 /**
  * Unit test for {@link ExampleMatcher}.
@@ -176,6 +175,47 @@ public void withCreatesNewInstance() throws Exception {
 		assertThat(configuredExampleSpec.isIgnoreCaseEnabled(), is(true));
 	}
 
+	/**
+	 * @see DATACMNS-900
+	 */
+	@Test
+	public void shouldCompareUsingHashCodeAndEquals() throws Exception {
+
+		matcher = matching() //
+				.withIgnorePaths("foo", "bar", "baz") //
+				.withNullHandler(NullHandler.IGNORE) //
+				.withIgnoreCase("ignored-case") //
+				.withMatcher("hello", GenericPropertyMatchers.contains().caseSensitive()) //
+				.withMatcher("world", new MatcherConfigurer<GenericPropertyMatcher>() {
+					@Override
+					public void configureMatcher(GenericPropertyMatcher matcher) {
+						matcher.endsWith();
+					}
+				});
+
+		ExampleMatcher sameAsMatcher = matching() //
+				.withIgnorePaths("foo", "bar", "baz") //
+				.withNullHandler(NullHandler.IGNORE) //
+				.withIgnoreCase("ignored-case") //
+				.withMatcher("hello", GenericPropertyMatchers.contains().caseSensitive()) //
+				.withMatcher("world", new MatcherConfigurer<GenericPropertyMatcher>() {
+					@Override
+					public void configureMatcher(GenericPropertyMatcher matcher) {
+						matcher.endsWith();
+					}
+				});
+
+		ExampleMatcher different = matching() //
+				.withIgnorePaths("foo", "bar", "baz") //
+				.withNullHandler(NullHandler.IGNORE) //
+				.withMatcher("hello", GenericPropertyMatchers.contains().ignoreCase());
+
+		assertThat(matcher.hashCode(), is(sameAsMatcher.hashCode()));
+		assertThat(matcher.hashCode(), is(not(different.hashCode())));
+		assertThat(matcher, is(equalTo(sameAsMatcher)));
+		assertThat(matcher, is(not(equalTo(different))));
+	}
+
 	static class Person {
 
 		String firstname;

src/test/java/org/springframework/data/domain/ExampleUnitTests.java

@@ -17,9 +17,11 @@
 
 import static org.hamcrest.CoreMatchers.*;
 import static org.junit.Assert.*;
+import static org.springframework.data.domain.ExampleMatcher.*;
 
 import org.junit.Before;
 import org.junit.Test;
+import org.springframework.data.domain.ExampleMatcher.*;
 
 /**
  * Test for {@link Example}.
@@ -54,10 +56,28 @@ public void rejectsNullProbe() {
 	 * @see DATACMNS-810
 	 */
 	@Test
-	public void retunsSampleObjectsClassAsProbeType() {
+	public void returnsSampleObjectsClassAsProbeType() {
 		assertThat(example.getProbeType(), is(equalTo(Person.class)));
 	}
 
+	/**
+	 * @see DATACMNS-900
+	 */
+	@Test
+	public void shouldCompareUsingHashCodeAndEquals() throws Exception {
+
+		Example<Person> example = Example.of(person, matching().withIgnoreCase("firstname"));
+		Example<Person> sameAsExample = Example.of(person, matching().withIgnoreCase("firstname"));
+
+		Example<Person> different = Example.of(person,
+				matching().withMatcher("firstname", GenericPropertyMatchers.contains()));
+
+		assertThat(example.hashCode(), is(sameAsExample.hashCode()));
+		assertThat(example.hashCode(), is(not(different.hashCode())));
+		assertThat(example, is(equalTo(sameAsExample)));
+		assertThat(example, is(not(equalTo(different))));
+	}
+
 	static class Person {
 		String firstname;
 	}