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Core services for Usergrid system.
/*******************************************************************************
* Copyright 2012 Apigee Corporation
*
* 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.usergrid.persistence;
import static org.usergrid.persistence.cassandra.IndexUpdate.compareIndexedValues;
import java.util.Comparator;
public class EntityPropertyComparator implements Comparator {
final boolean reverse;
final String propertyName;
public EntityPropertyComparator(String propertyName) {
this.propertyName = propertyName;
reverse = false;
}
public EntityPropertyComparator(String propertyName, boolean reverse) {
this.propertyName = propertyName;
this.reverse = reverse;
}
@Override
public int compare(Entity e1, Entity e2) {
if ((e1 == null) && (e2 == null)) {
return 0;
} else if (e1 == null) {
return -1;
} else if (e2 == null) {
return 1;
}
int c = compareIndexedValues(e1.getProperty(propertyName),
e2.getProperty(propertyName));
if (reverse) {
c = -c;
}
return c;
}
}