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

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

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/*
 * Copyright 2011 Daisuke Miyamoto.
 * Created on 2012/02/14
 *
 * 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.List;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;

import org.apache.wicket.model.AbstractReadOnlyModel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.lang.Args;

/**
 * TODO for daisuke
 * 
 * @param <T> ??
 * @since 1.0
 * @version $Id$
 * @author daisuke
 */
@SuppressWarnings("serial")
public class SingleSelectModel<T> extends AbstractReadOnlyModel<T> {

    private final IModel<List<? extends T>> delegate;

    private final Predicate<T> predicate;

    /**
     * ??
     * 
     * @param delegate 
     * @param predicate 
     * @throws IllegalArgumentException ?{@code null}???
     */
    public SingleSelectModel(IModel<List<? extends T>> delegate, Predicate<T> predicate) {
        Args.notNull(delegate, "delegate");
        Args.notNull(predicate, "predicate");
        this.delegate = delegate;
        this.predicate = predicate;
    }

    @Override
    public void detach() {
        delegate.detach();
    }

    @Override
    public T getObject() {
        return Iterables.getFirst(Iterables.filter(delegate.getObject(), predicate), null);
    }
}