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java/org/apache/catalina/manager/util/BaseSessionComparator.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.catalina.manager.util;
+
+import java.util.Comparator;
+
+import org.apache.catalina.Session;
+
+/**
+ * Comparator which permits to compare on a session's content.
+ *
+ * @param <T> The type of the session content to be compared
+ *
+ * @author C&eacute;drik LIME
+ */
+public abstract class BaseSessionComparator<T> implements Comparator<Session> {
+
+    /**
+     *
+     */
+    public BaseSessionComparator() {
+        super();
+    }
+
+    public abstract Comparable<T> getComparableObject(Session session);
+
+    /* (non-Javadoc)
+     * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
+     */
+    @SuppressWarnings("unchecked")
+    @Override
+    public final int compare(Session s1, Session s2) {
+        Comparable<T> c1 = getComparableObject(s1);
+        Comparable<T> c2 = getComparableObject(s2);
+        return c1==null ? (c2==null ? 0 : -1) : (c2==null ? 1 : c1.compareTo((T)c2));
+    }
+}