/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* 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 net.ontopia.utils;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* INTERNAL: Filter that filters a collection using a decider. The
* decider is applied to the individual objects in the collection. If
* the object is accepted by the decider it will become part of the
* result.</p>
*/
public class DeciderFilter<T> implements FilterIF<T> {
protected DeciderIF<T> decider;
public DeciderFilter(DeciderIF<T> decider) {
this.decider = decider;
}
public Collection<T> filter(Iterator<T> objects) {
// Initialize result
List<T> result = new ArrayList<T>();
// Loop over the objects
while (objects.hasNext()) {
T object = objects.next();
// Add object to result if accepted by decider
if (decider.ok(object))
result.add(object);
}
return result;
}
}