/*
* File: AttributeComparator.java
*
* Copyright 2007 Macquarie E-Learning Centre Of Excellence
*
* Licensed 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.fcrepo.server.security.xacml.util;
import java.util.Comparator;
import org.fcrepo.server.security.Attribute;
/**
* Class to compare two Attributes.
*
* @author nishen@melcoe.mq.edu.au
*/
public class AttributeComparator
implements Comparator<Attribute> {
/*
* (non-Javadoc)
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
public int compare(Attribute a, Attribute b) {
int result = a.getId().toString().compareTo(b.getId().toString());
if (result == 0) {
result = a.getType().toString().compareTo(b.getType().toString());
} else {
return result;
}
if (result == 0) {
result = a.getValue().encode().compareTo(b.getValue().encode());
} else {
return result;
}
if (result == 0
&& (a.getIssueInstant() != null || b.getIssueInstant() != null)) {
if (a.getIssueInstant() == null && b.getIssueInstant() == null) {
result = 0;
} else if (a.getIssueInstant() != null
&& b.getIssueInstant() == null) {
result = 1;
} else if (a.getIssueInstant() == null
&& b.getIssueInstant() != null) {
result = -1;
} else {
result =
a.getIssueInstant().encode().compareTo(b
.getIssueInstant().encode());
}
}
return result;
}
}