de.alpharogroup.wicket.model.dropdownchoices.TwoDropDownChoicesModel.java Source code

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Here is the source code for de.alpharogroup.wicket.model.dropdownchoices.TwoDropDownChoicesModel.java

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/**
 * Copyright (C) 2010 Asterios Raptis
 *
 * 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 de.alpharogroup.wicket.model.dropdownchoices;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

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

import lombok.Getter;
import lombok.Setter;

/**
 * The Class {@link TwoDropDownChoicesModel}.
 *
 * @param <T>
 *            the generic type of the model object
 */
public class TwoDropDownChoicesModel<T> implements IClusterable {

    /** The Constant serialVersionUID. */
    private static final long serialVersionUID = 1L;

    /** The selected root option. */
    @Getter
    @Setter
    private T selectedRootOption;

    /** The selected child option. */
    @Getter
    @Setter
    private T selectedChildOption;

    /** The models map. */
    @Getter
    @Setter
    private Map<T, List<T>> modelsMap = new HashMap<>();

    /** The root choices. */
    @Getter
    private final IModel<List<T>> rootChoices;

    /** The child choices. */
    @SuppressWarnings("unused")
    private IModel<List<T>> childChoices;

    /**
     * Instantiates a new {@link TwoDropDownChoicesModel}.
     *
     * @param selectedOption
     *            the selected option
     * @param modelsMap
     *            the models map
     */
    public TwoDropDownChoicesModel(final T selectedOption, final Map<T, List<T>> modelsMap) {
        this.modelsMap = Args.notNull(modelsMap, "modelsMap");

        rootChoices = new AbstractReadOnlyModel<List<T>>() {

            /** The Constant serialVersionUID. */
            private static final long serialVersionUID = 1L;

            /**
             * {@inheritDoc}
             */
            @Override
            public List<T> getObject() {
                final Set<T> keys = modelsMap.keySet();
                final List<T> keysList = new ArrayList<>(keys);
                return keysList;
            }

        };
        this.selectedRootOption = Args.notNull(selectedOption, "selectedOption");

        this.childChoices = getChildChoices();

    }

    /**
     * Gets the child choices.
     *
     * @return the child choices
     */
    public IModel<List<T>> getChildChoices() {
        final T selectedRootOption = TwoDropDownChoicesModel.this.selectedRootOption;
        final IModel<List<T>> childChoices = new AbstractReadOnlyModel<List<T>>() {

            /** The Constant serialVersionUID. */
            private static final long serialVersionUID = 1L;

            /**
             * {@inheritDoc}
             */
            @Override
            public List<T> getObject() {
                List<T> models = getModelsMap().get(selectedRootOption);
                if (models == null) {
                    models = Collections.emptyList();
                }
                return models;
            }

        };
        return childChoices;
    }

}