Add Predicates utility.

Original Pull Request: #2420

src/main/java/org/springframework/data/util/Predicates.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2021 the original author or 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
+ *
+ *      https://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 org.springframework.data.util;
+
+import java.util.function.Predicate;
+
+import org.springframework.util.Assert;
+
+/**
+ * Utility methods to work with {@link Predicate}s.
+ *
+ * @author Mark Paluch
+ * @since 2.7
+ */
+public interface Predicates {
+
+	/**
+	 * A {@link Predicate} that yields always {@code true}.
+	 *
+	 * @return a {@link Predicate} that yields always {@code true}.
+	 */
+	static <T> Predicate<T> isTrue() {
+		return t -> true;
+	}
+
+	/**
+	 * A {@link Predicate} that yields always {@code false}.
+	 *
+	 * @return a {@link Predicate} that yields always {@code false}.
+	 */
+	static <T> Predicate<T> isFalse() {
+		return t -> false;
+	}
+
+	/**
+	 * Returns a {@link Predicate} that represents the logical negation of {@code predicate}.
+	 *
+	 * @return a {@link Predicate} that represents the logical negation of {@code predicate}.
+	 */
+	static <T> Predicate<T> negate(Predicate<T> predicate) {
+
+		Assert.notNull(predicate, "Predicate must not be null!");
+		return predicate.negate();
+	}
+}