jp.xet.uncommons.wicket.model.CollectionCountModel.java Source code

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Here is the source code for jp.xet.uncommons.wicket.model.CollectionCountModel.java

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/*
 * Copyright 2011 Daisuke Miyamoto.
 * Created on 2012/05/17
 *
 * 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 jp.xet.uncommons.wicket.model;

import java.util.Collection;

import jp.xet.uncommons.wicket.utils.WicketUtil;

import org.apache.wicket.model.AbstractReadOnlyModel;
import org.apache.wicket.model.IModel;

/**
 * TODO for daisuke
 * 
 * @since 1.8
 * @version $Id: CollectionCountModel.java 6989 2012-07-13 09:58:41Z miyamoto $
 * @author daisuke
 */
@SuppressWarnings("serial")
public class CollectionCountModel extends AbstractReadOnlyModel<Long> {

    private final IModel<? extends Collection<?>> collectionModel;

    /**
     * ??
     * 
     * @param collectionModel collection {@link IModel}
     */
    public CollectionCountModel(IModel<? extends Collection<?>> collectionModel) {
        this.collectionModel = collectionModel;
    }

    @Override
    public void detach() {
        WicketUtil.detachIfNotNull(collectionModel);
        super.detach();
    }

    @Override
    public Long getObject() {
        Collection<?> collection = collectionModel == null ? null : collectionModel.getObject();
        return collection == null ? 0L : collection.size();
    }
}