fix: undo #1798 for backward compatibility (#1811)

src/main/java/spoon/reflect/visitor/Filter.java

@@ -16,8 +16,6 @@
  */
 package spoon.reflect.visitor;
 
-import java.util.function.Predicate;
-
 import spoon.reflect.declaration.CtElement;
 
 /**
@@ -27,15 +25,10 @@
  * 		the type of the filtered elements (an element belonging to the
  * 		filtered element must be assignable from <code>T</code>).
  */
-public interface Filter<T extends CtElement> extends Predicate<T> {
+public interface Filter<T extends CtElement> {
 	/**
 	 * Tells if the given element matches.
 	 * @param element - the element to be checked for a match. Parameter element is never null if {@link Query} is used.
 	 */
 	boolean matches(T element);
-
-	@Override
-	default boolean test(T element) {
-		return matches(element);
-	}
 }

src/main/java/spoon/reflect/visitor/filter/AbstractFilter.java

@@ -60,9 +60,4 @@ public Class<T> getType() {
 	public boolean matches(T element) {
 		return type.isAssignableFrom(element.getClass());
 	}
-
-	@Override
-	public boolean test(T element) {
-		return matches(element);
-	}
 }

src/test/java/spoon/test/filters/FilterTest.java

@@ -1285,13 +1285,4 @@ public void testNameFilterWithGenericType() {
 		assertEquals(1, ctFields.size());
 		assertTrue(ctFields.get(0) instanceof CtField);
 	}
-
-	@Test
-	public void testFilterAsPredicate() throws Exception {
-		CtClass<?> foo = factory.Package().get("spoon.test.filters").getType("Foo");
-		//contract: Spoon Filter is compatible with java.util.function.Predicate
-		Predicate predicate = new NamedElementFilter<>(CtClass.class, "Foo");
-		assertTrue(predicate.test(foo));
-		assertFalse(predicate.test(foo.getTypeMembers().get(0)));
-	}
 }