org.odlabs.wiquery.ui.autocomplete.AutocompleteComponent.java Source code

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Here is the source code for org.odlabs.wiquery.ui.autocomplete.AutocompleteComponent.java

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/*
 * Copyright (c) 2009 WiQuery team
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.odlabs.wiquery.ui.autocomplete;

import java.io.IOException;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;

import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.markup.html.form.IChoiceRenderer;
import org.apache.wicket.model.IModel;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * $Id: AutocompleteComponent.java 463 2010-10-19 12:14:45Z richardjohnwilkinson@gmail.com
 * $
 * <p>
 * Creates an autocomplete UI component which will bind on a Wicket model
 * </p>
 * 
 * @author Julien Roche
 * @param <T>
 *            The model object type
 * @since 1.1
 */
public abstract class AutocompleteComponent<T> extends AbstractAutocompleteComponent<T> {
    // Constants
    /** Constant of serialization */
    private static final long serialVersionUID = -3377109382248062940L;

    // Properties
    private final IModel<? extends List<? extends T>> list;

    /**
     * Constructor
     * 
     * @param id
     *            Wicket identifier
     * @param model
     *            Model of the default value
     * @param list
     *            List of possibles values
     */
    public AutocompleteComponent(String id, final IModel<T> model, final IModel<? extends List<? extends T>> list) {
        super(id, model);
        this.list = list;
    }

    /**
     * Constructor
     * 
     * @param id
     *            Wicket identifier
     * @param model
     *            Model of the default value
     * @param list
     *            List of possibles values
     */
    public AutocompleteComponent(String id, final IModel<T> model, final IModel<? extends List<? extends T>> list,
            IChoiceRenderer<? super T> choiceRenderer) {
        super(id, model, choiceRenderer);
        this.list = list;
    }

    @Override
    protected void onBeforeRenderAutocomplete(Autocomplete<?> autocomplete) {
        StringWriter sw = new StringWriter();

        try {
            JsonGenerator gen = new JsonFactory().createGenerator(sw);

            List<Object> json = new ArrayList<Object>();
            T defaultValue = AutocompleteComponent.this.getModelObject();
            AutocompleteJson value = null;
            Integer index = 0;

            for (T obj : AutocompleteComponent.this.list.getObject()) {
                index++;
                value = newAutocompleteJson(index, obj);
                json.add(value);

                if (obj.equals(defaultValue)) {
                    autocomplete.setDefaultModelObject(value.getLabel());
                    getAutocompleteHidden().setModelObject(value.getValueId());
                }
            }

            new ObjectMapper().writeValue(gen, json);

        } catch (IOException e) {
            throw new WicketRuntimeException(e);
        }

        autocomplete.getOptions().put("source", sw.toString());
    }

    @Override
    protected List<? extends T> getChoices() {
        return list.getObject();
    }

    @Override
    protected void onDetach() {
        super.onDetach();
        if (list != null) {
            list.detach();
        }
    }

}