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CountableLoadableModel.java
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CountableLoadableModel.java
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/*
* Copyright (c) 2010-2017 Evolveum
*
* 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 com.evolveum.midpoint.gui.api.model;
import java.util.List;
/**
* A loadable model of a list that knows how to provide count of list items without having to retrieve the actual data.
* Useful e.g. to implement MID-3938 (Optimize midPoint for many focus assignments).
*
* @author mederly
*/
public abstract class CountableLoadableModel<T> extends LoadableModel<List<T>> {
public CountableLoadableModel() {
}
public CountableLoadableModel(boolean alwaysReload) {
super(alwaysReload);
}
public int count() {
if (isLoaded()) {
List<T> object = getObject();
return object != null ? object.size() : 0;
} else {
return countInternal();
}
}
// This should be overridden to provide more efficient implementation, avoiding full loading of objects
public int countInternal() {
List<T> object = getObject();
return object != null ? object.size() : 0;
}
}