/* * Copyright (C) 2007 The Guava Authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.common.base; import static com.google.common.base.Preconditions.checkNotNull; import com.google.common.annotations.GwtCompatible; import java.io.Serializable; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.List; import javax.annotation.Nullable; /** * Static utility methods pertaining to {@code Predicate} instances. * *
All methods returns serializable predicates as long as they're given
* serializable parameters.
*
* @author Kevin Bourrillion
* @since 2.0 (imported from Google Collections Library)
*/
@GwtCompatible(emulated = true)
public final class Predicates {
private Predicates() {}
// TODO(kevinb): considering having these implement a VisitablePredicate
// interface which specifies an accept(PredicateVisitor) method.
/**
* Returns a predicate that always evaluates to {@code true}.
*/
@GwtCompatible(serializable = true)
public static This method can technically accept any {@code Collection>}, but using
* a typed collection helps prevent bugs. This approach doesn't block any
* potential users since it is always possible to use {@code
* Predicates.