53 lines
1.7 KiB
Java
53 lines
1.7 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.catalina.manager.util;
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import java.util.Comparator;
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import org.apache.catalina.Session;
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/**
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* Comparator which permits to compare on a session's content.
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*
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* @param <T> The type of the session content to be compared
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*
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* @author Cédrik LIME
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*/
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public abstract class BaseSessionComparator<T> implements Comparator<Session> {
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/**
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*
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*/
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public BaseSessionComparator() {
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super();
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}
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public abstract Comparable<T> getComparableObject(Session session);
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/* (non-Javadoc)
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* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
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*/
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@SuppressWarnings("unchecked")
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@Override
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public final int compare(Session s1, Session s2) {
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Comparable<T> c1 = getComparableObject(s1);
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Comparable<T> c2 = getComparableObject(s2);
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return c1==null ? (c2==null ? 0 : -1) : (c2==null ? 1 : c1.compareTo((T)c2));
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}
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}
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