| /* |
| * 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 |
| * |
| * https://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.directory.api.ldap.model.schema.comparators; |
| |
| |
| import org.apache.directory.api.i18n.I18n; |
| import org.apache.directory.api.ldap.model.schema.LdapComparator; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * Compares two objects taking into account that one might be a Comparable. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| * @param <T> the type, must extend {@link Comparable} |
| */ |
| public class ComparableComparator<T> extends LdapComparator<Comparable<T>> |
| { |
| /** The serial version UID */ |
| private static final long serialVersionUID = 2L; |
| |
| /** A logger for this class */ |
| private static final Logger LOG = LoggerFactory.getLogger( ComparableComparator.class ); |
| |
| |
| /** |
| * The ComparableComparator constructor. |
| * |
| * @param oid the comparator OID |
| */ |
| public ComparableComparator( String oid ) |
| { |
| super( oid ); |
| } |
| |
| |
| /** |
| * Compares two objects taking into account that one may be a Comparable. If |
| * the first is a comparable then its compareTo operation is called and the |
| * result returned as is. If the first is not a Comparable but the second is |
| * then its compareTo method is called and the result is returned after |
| * being negated. If none are comparable the hashCode of o1 minus the |
| * hashCode of o2 is returned. |
| * |
| * @param o1 the first comparable |
| * @param o2 the second comparable |
| * @return {@inheritDoc} |
| */ |
| @SuppressWarnings("unchecked") |
| public int compare( Comparable<T> o1, Comparable<T> o2 ) |
| { |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.msg( I18n.MSG_13755_COMPARING_OBJECTS, o1, o2 ) ); |
| } |
| |
| if ( o1 == null ) |
| { |
| if ( o2 == null ) |
| { |
| return 0; |
| } |
| else |
| { |
| return -1; |
| } |
| } |
| |
| if ( o2 == null ) |
| { |
| return 1; |
| } |
| |
| return o1.compareTo( ( T ) o2 ); |
| } |
| } |