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src/jdk.internal.vm.compiler/share/classes/jdk.internal.vm.compiler.collections/src/jdk/internal/vm/compiler/collections/Equivalence.java

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rev 52509 : [mq]: graal
   1 /*
   2  * Copyright (c) 2017, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.


















  22  */
  23 
  24 
  25 package jdk.internal.vm.compiler.collections;
  26 
  27 /**
  28  * Strategy for comparing two objects. Default predefined strategies are {@link #DEFAULT},
  29  * {@link #IDENTITY}, and {@link #IDENTITY_WITH_SYSTEM_HASHCODE}.
  30  *
  31  * @since 1.0
  32  */
  33 public abstract class Equivalence {
  34 
  35     /**
  36      * Default equivalence calling {@link #equals(Object)} to check equality and {@link #hashCode()}
  37      * for obtaining hash values. Do not change the logic of this class as it may be inlined in
  38      * other places.
  39      *
  40      * @since 1.0
  41      */
  42     public static final Equivalence DEFAULT = new Equivalence() {
  43 
  44         @Override


   1 /*
   2  * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * The Universal Permissive License (UPL), Version 1.0
   6  *
   7  * Subject to the condition set forth below, permission is hereby granted to any
   8  * person obtaining a copy of this software, associated documentation and/or
   9  * data (collectively the "Software"), free of charge and under any and all
  10  * copyright rights in the Software, and any and all patent rights owned or
  11  * freely licensable by each licensor hereunder covering either (i) the
  12  * unmodified Software as contributed to or provided by such licensor, or (ii)
  13  * the Larger Works (as defined below), to deal in both
  14  *
  15  * (a) the Software, and
  16  *
  17  * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
  18  * one is included with the Software each a "Larger Work" to which the Software
  19  * is contributed by such licensors),
  20  *
  21  * without restriction, including without limitation the rights to copy, create
  22  * derivative works of, display, perform, and distribute the Software and make,
  23  * use, sell, offer for sale, import, export, have made, and have sold the
  24  * Software and the Larger Work(s), and to sublicense the foregoing rights on
  25  * either these or other terms.
  26  *
  27  * This license is subject to the following condition:
  28  *
  29  * The above copyright notice and either this complete permission notice or at a
  30  * minimum a reference to the UPL must be included in all copies or substantial
  31  * portions of the Software.
  32  *
  33  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  34  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  35  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  36  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  37  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  38  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  39  * SOFTWARE.
  40  */


  41 package jdk.internal.vm.compiler.collections;
  42 
  43 /**
  44  * Strategy for comparing two objects. Default predefined strategies are {@link #DEFAULT},
  45  * {@link #IDENTITY}, and {@link #IDENTITY_WITH_SYSTEM_HASHCODE}.
  46  *
  47  * @since 1.0
  48  */
  49 public abstract class Equivalence {
  50 
  51     /**
  52      * Default equivalence calling {@link #equals(Object)} to check equality and {@link #hashCode()}
  53      * for obtaining hash values. Do not change the logic of this class as it may be inlined in
  54      * other places.
  55      *
  56      * @since 1.0
  57      */
  58     public static final Equivalence DEFAULT = new Equivalence() {
  59 
  60         @Override


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