package org.apache.myfaces.tobago.util;
/*
* 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
*
* 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.
*/
import java.text.CollationKey;
import java.text.Collator;
import java.util.Comparator;
public abstract class ComparatorBase implements Comparator {
private Comparator comparator;
private boolean reverse;
protected ComparatorBase() {
}
protected ComparatorBase(boolean reverse, Comparator comparator) {
this.comparator = comparator;
this.reverse = reverse;
}
protected ComparatorBase(boolean reverse) {
this.reverse = reverse;
}
protected ComparatorBase(Comparator comparator) {
this.comparator = comparator;
}
protected int internalCompare(Object obj1, Object obj2) {
if (obj1 == null || obj2 == null) {
if (obj1 == null && obj2 == null) {
return 0;
}
if (obj1 == null) {
return reverse ? 1 : -1;
} else {
return reverse ? -1 : 1;
}
}
if (!obj1.getClass().isInstance(obj2)) {
throw new ClassCastException(obj1.getClass().getName() + " != "
+ obj2.getClass().getName());
}
int result;
if (comparator instanceof Collator) {
CollationKey collationKey1
= ((Collator) comparator).getCollationKey(obj1.toString());
CollationKey collationKey2
= ((Collator) comparator).getCollationKey(obj2.toString());
result = collationKey1.compareTo(collationKey2);
} else if (comparator != null) {
result = comparator.compare(obj1, obj2);
} else {
if (obj1 instanceof String) {
result = ((String) obj1).compareToIgnoreCase((String) obj2);
} else if (obj1 instanceof Comparable) {
result = ((Comparable) obj1).compareTo(obj2);
} else {
result = obj1.toString().compareTo(obj2.toString());
}
}
return reverse ? -result : result;
}
/*
// TODO use this??
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final ComparatorBase that = (ComparatorBase) o;
return !(comparator != null ? !comparator.equals(that.comparator) : that.comparator != null);
}
public int hashCode() {
return (comparator != null ? comparator.hashCode() : 0);
} */
public boolean equals(Object o) {
if (o == null) {
return false;
}
return ((ComparatorBase) o).getComparator().equals(comparator);
}
public int hashCode() {
return (comparator != null ? comparator.hashCode() : 0);
}
public Comparator getComparator() {
return comparator;
}
}