/* Copyright 2012 the original author or authors.
*
* 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.grails.validation;
import grails.core.GrailsDomainClass;
import grails.core.GrailsDomainClassProperty;
import grails.validation.Constrained;
import java.util.Comparator;
import java.util.Map;
import org.springframework.util.Assert;
/**
* Comparator that uses the domain class property constraints to establish order in sort methods and always
* places the id first.
*
* @author Graeme Rocher
*
*/
@SuppressWarnings("rawtypes")
public class DomainClassPropertyComparator implements Comparator {
private Map constrainedProperties;
private GrailsDomainClass domainClass;
public DomainClassPropertyComparator(GrailsDomainClass domainClass) {
Assert.notNull(domainClass, "Argument 'domainClass' is required!");
constrainedProperties = domainClass.getConstrainedProperties();
this.domainClass = domainClass;
}
public int compare(Object o1, Object o2) {
if (o1.equals(domainClass.getIdentifier())) {
return -1;
}
if (o2.equals(domainClass.getIdentifier())) {
return 1;
}
GrailsDomainClassProperty prop1 = (GrailsDomainClassProperty)o1;
GrailsDomainClassProperty prop2 = (GrailsDomainClassProperty)o2;
Constrained cp1 = (Constrained)constrainedProperties.get(prop1.getName());
Constrained cp2 = (Constrained)constrainedProperties.get(prop2.getName());
if (cp1 == null & cp2 == null) {
return prop1.getName().compareTo(prop2.getName());
}
if (cp1 == null) {
return 1;
}
if (cp2 == null) {
return -1;
}
if (cp1.getOrder() > cp2.getOrder()) {
return 1;
}
if (cp1.getOrder() < cp2.getOrder()) {
return -1;
}
return 0;
}
}