1 /* 2 * Copyright (C) 2007 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect; 18 19 import com.google.common.annotations.GwtCompatible; 20 21 import java.io.Serializable; 22 23 /** An ordering that uses the reverse of the natural order of the values. */ 24 @GwtCompatible(serializable = true) 25 final class UsingToStringOrdering 26 extends Ordering<Object> implements Serializable { 27 static final UsingToStringOrdering INSTANCE = new UsingToStringOrdering(); 28 compare(Object left, Object right)29 public int compare(Object left, Object right) { 30 return left.toString().compareTo(right.toString()); 31 } 32 33 // preserve singleton-ness, so equals() and hashCode() work correctly readResolve()34 private Object readResolve() { 35 return INSTANCE; 36 } 37 toString()38 @Override public String toString() { 39 return "Ordering.usingToString()"; 40 } 41 UsingToStringOrdering()42 private UsingToStringOrdering() {} 43 44 private static final long serialVersionUID = 0; 45 } 46