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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.onosproject.ui.table.cell;
import org.onosproject.ui.table.CellComparator;
/**
* Base implementation of a {@link CellComparator}. This class takes care
* of dealing with null inputs; subclasses should implement their comparison
* knowing that both inputs are guaranteed to be non-null.
*/
public abstract class AbstractCellComparator implements CellComparator {
@Override
public int compare(Object o1, Object o2) {
if (o1 == null && o2 == null) {
return 0; // o1 == o2
}
if (o1 == null) {
return -1; // o1 < o2
}
if (o2 == null) {
return 1; // o1 > o2
}
return nonNullCompare(o1, o2);
}
/**
* Compares its two arguments for order. Returns a negative integer,
* zero, or a positive integer as the first argument is less than, equal
* to, or greater than the second.<p>
*
* Note that both objects are guaranteed to be non-null.
*
* @see java.util.Comparator#compare(Object, Object)
*
* @param o1 the first object to be compared.
* @param o2 the second object to be compared.
* @return a negative integer, zero, or a positive integer as the
* first argument is less than, equal to, or greater than the
* second.
* @throws ClassCastException if the arguments' types prevent them from
* being compared by this comparator.
*/
protected abstract int nonNullCompare(Object o1, Object o2);
}
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