70 lines
2.0 KiB
Java
70 lines
2.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.lang3.compare;
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import java.io.Serializable;
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import java.util.Comparator;
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/**
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* Compares Object's {@link Object#toString()} values.
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*
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* This class is stateless.
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*
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* @since 3.10
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*/
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public final class ObjectToStringComparator implements Comparator<Object>, Serializable {
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/**
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* Singleton instance.
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*
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* This class is stateless.
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*/
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public static final ObjectToStringComparator INSTANCE = new ObjectToStringComparator();
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/**
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* For {@link Serializable}.
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*/
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private static final long serialVersionUID = 1L;
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@Override
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public int compare(final Object o1, final Object o2) {
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if (o1 == null && o2 == null) {
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return 0;
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}
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if (o1 == null) {
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return 1;
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}
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if (o2 == null) {
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return -1;
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}
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final String string1 = o1.toString();
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final String string2 = o2.toString();
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// No guarantee that toString() returns a non-null value, despite what Spotbugs thinks.
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if (string1 == null && string2 == null) {
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return 0;
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}
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if (string1 == null) {
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return 1;
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}
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if (string2 == null) {
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return -1;
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}
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return string1.compareTo(string2);
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}
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}
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