com.googlecode.wicket.kendo.ui.behavior.ChoiceModelBehavior.java Source code

Introduction

Here is the source code for com.googlecode.wicket.kendo.ui.behavior.ChoiceModelBehavior.java

Source

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.googlecode.wicket.kendo.ui.behavior;

import java.util.List;

import org.apache.wicket.Application;
import org.apache.wicket.behavior.AbstractAjaxBehavior;
import org.apache.wicket.request.IRequestCycle;
import org.apache.wicket.request.IRequestHandler;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.http.WebResponse;

import com.googlecode.wicket.kendo.ui.renderer.IChoiceRenderer;

/**
 * Provides the choice ajax loading behavior
 *
 * @author Sebastien Briquet - sebfz1
 *
 * @param <T> the model object type
 */
public abstract class ChoiceModelBehavior<T> extends AbstractAjaxBehavior {
    private static final long serialVersionUID = 1L;

    private final IChoiceRenderer<? super T> renderer;

    public ChoiceModelBehavior(IChoiceRenderer<? super T> renderer) {
        super();

        this.renderer = renderer;
    }

    @Override
    public void onRequest() {
        RequestCycle.get().scheduleRequestHandlerAfterCurrent(this.newRequestHandler());
    }

    /**
     * Get a new {@link IRequestHandler}
     * @return a new {@link IRequestHandler}
     */
    protected IRequestHandler newRequestHandler() {
        return new IRequestHandler() {

            @Override
            public void respond(final IRequestCycle requestCycle) {
                WebResponse response = (WebResponse) requestCycle.getResponse();

                final String encoding = Application.get().getRequestCycleSettings().getResponseRequestEncoding();
                response.setContentType("application/json; charset=" + encoding);
                response.disableCaching();

                List<T> list = ChoiceModelBehavior.this.getChoices();

                if (list != null) {
                    int count = 0;
                    StringBuilder builder = new StringBuilder("[");

                    for (T object : list) {
                        if (count++ > 0) {
                            builder.append(",");
                        }

                        builder.append(ChoiceModelBehavior.this.renderer.toJson(object));
                    }

                    builder.append("]");

                    response.write(builder);
                }
            }

            @Override
            public void detach(final IRequestCycle requestCycle) {
                // noop
            }
        };
    }

    /**
     * Get the {@link List} of choices
     *
     * @return the list of choices
     */
    public abstract List<T> getChoices();
}