8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/java/util/function/Predicate.java

@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package java.util.function;
+
+import java.util.Objects;
+
+/**
+ * Represents a predicate (boolean-valued function) of one argument.
+ *
+ * <p>This is a <a href="package-summary.html">functional interface</a>
+ * whose functional method is {@link #test(Object)}.
+ *
+ * @param <T> the type of the input to the predicate
+ *
+ * @since 1.8
+ */
+@FunctionalInterface
+public interface Predicate<T> {
+
+    /**
+     * Evaluates this predicate on the given argument.
+     *
+     * @param t the input argument
+     * @return {@code true} if the input argument matches the predicate,
+     * otherwise {@code false}
+     */
+    boolean test(T t);
+
+    /**
+     * Returns a composed predicate that represents a short-circuiting logical
+     * AND of this predicate and another.  When evaluating the composed
+     * predicate, if this predicate is {@code false}, then the {@code other}
+     * predicate is not evaluated.
+     *
+     * <p>Any exceptions thrown during evaluation of either predicate are relayed
+     * to the caller; if evaluation of this predicate throws an exception, the
+     * {@code other} predicate will not be evaluated.
+     *
+     * @param other a predicate that will be logically-ANDed with this
+     *              predicate
+     * @return a composed predicate that represents the short-circuiting logical
+     * AND of this predicate and the {@code other} predicate
+     * @throws NullPointerException if other is null
+     */
+    default Predicate<T> and(Predicate<? super T> other) {
+        Objects.requireNonNull(other);
+        return (t) -> test(t) && other.test(t);
+    }
+
+    /**
+     * Returns a predicate that represents the logical negation of this
+     * predicate.
+     *
+     * @return a predicate that represents the logical negation of this
+     * predicate
+     */
+    default Predicate<T> negate() {
+        return (t) -> !test(t);
+    }
+
+    /**
+     * Returns a composed predicate that represents a short-circuiting logical
+     * OR of this predicate and another.  When evaluating the composed
+     * predicate, if this predicate is {@code true}, then the {@code other}
+     * predicate is not evaluated.
+     *
+     * <p>Any exceptions thrown during evaluation of either predicate are relayed
+     * to the caller; if evaluation of this predicate throws an exception, the
+     * {@code other} predicate will not be evaluated.
+     *
+     * @param other a predicate that will be logically-ORed with this
+     *              predicate
+     * @return a composed predicate that represents the short-circuiting logical
+     * OR of this predicate and the {@code other} predicate
+     * @throws NullPointerException if other is null
+     */
+    default Predicate<T> or(Predicate<? super T> other) {
+        Objects.requireNonNull(other);
+        return (t) -> test(t) || other.test(t);
+    }
+
+    /**
+     * Returns a predicate that tests if two arguments are equal according
+     * to {@link Objects#equals(Object, Object)}.
+     *
+     * @param <T> the type of arguments to the predicate
+     * @param targetRef the object reference with which to compare for equality,
+     *               which may be {@code null}
+     * @return a predicate that tests if two arguments are equal according
+     * to {@link Objects#equals(Object, Object)}
+     */
+    static <T> Predicate<T> isEqual(Object targetRef) {
+        return (null == targetRef)
+                ? Objects::isNull
+                : object -> targetRef.equals(object);
+    }
+}