Added method for checking if a class has a method with a certain name

Author: bbottema

src/main/java/org/bbottema/javareflection/ClassUtils.java

@@ -257,6 +257,15 @@ public static List<Method> collectMethodsByName(final Class<?> type, Class<?> bo
 		return collectMethodsMappingToName(type, boundaryMarker, methodModifiers).get(methodName);
 	}
 
+	/**
+	 * @return Whether {@link #collectMethodsMappingToName(Class, Class, EnumSet)} contains a method with the given name.
+	 */
+	@SuppressWarnings("WeakerAccess")
+	public static boolean hasMethodByName(final Class<?> type, Class<?> boundaryMarker, EnumSet<MethodModifier> methodModifiers, final String methodName) {
+		LinkedHashMap<String, List<Method>> methodsByName = collectMethodsMappingToName(type, boundaryMarker, methodModifiers);
+		return methodsByName.containsKey(methodName) && !methodsByName.get(methodName).isEmpty();
+	}
+
 	/**
 	 * @return The first result of {@link #collectMethodsByName(Class, Class, EnumSet, String)}.
 	 * 			<strong>Note: </strong> methods are ordered in groups (see {@link #collectMethods(Class, Class, EnumSet)})).

src/test/java/org/bbottema/javareflection/ClassUtilsTest.java

@@ -135,6 +135,13 @@ public void testFindFirstMethodsByName() {
 		assertThat(ClassUtils.findFirstMethodByName(C.class, Object.class, MATCH_ANY, "protectedMethod"))
 				.extracting("name").containsExactly("protectedMethod");
 	}
+
+	@Test
+	public void testHasMethodByName() {
+		assertThat(ClassUtils.hasMethodByName(C.class, C.class, MATCH_ANY, "foo")).isTrue();
+		assertThat(ClassUtils.hasMethodByName(C.class, Object.class, MATCH_ANY, "protectedMethod")).isTrue();
+		assertThat(ClassUtils.hasMethodByName(C.class, Object.class, MATCH_ANY, "lalala")).isFalse();
+	}
 
 	@Test
 	public void testCollectMethodsMappingToName() {