com.googlecode.wicket.kendo.ui.widget.treeview.TreeViewModelBehavior.java Source code

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Here is the source code for com.googlecode.wicket.kendo.ui.widget.treeview.TreeViewModelBehavior.java

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/*
 * 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.widget.treeview;

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.IRequestParameters;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.http.WebResponse;
import org.apache.wicket.util.lang.Args;

/**
 * Provides the behavior that loads {@link TreeNode}{@code s}
 *
 * @author Sebastien Briquet - sebfz1
 *
 */
public class TreeViewModelBehavior extends AbstractAjaxBehavior {
    private static final long serialVersionUID = 1L;

    private final TreeViewModel model;
    private final TreeNodeFactory factory;

    /**
     * Constructor
     *
     * @param model the {@link TreeViewModel}
     * @param factory the {@link TreeNodeFactory}
     */
    public TreeViewModelBehavior(final TreeViewModel model, TreeNodeFactory factory) {
        this.model = model;
        this.factory = Args.notNull(factory, "factory");
    }

    // Properties //

    /**
     * Gets the {@link TreeNodeFactory}
     * 
     * @return the {@code TreeNodeFactory}
     */
    public TreeNodeFactory getFactory() {
        return this.factory;
    }

    // Events //

    @Override
    public void onRequest() {
        final RequestCycle requestCycle = RequestCycle.get();
        IRequestParameters parameters = requestCycle.getRequest().getQueryParameters();

        this.model.setNodeId(parameters.getParameterValue(TreeNodeFactory.ID_FIELD).toInt(TreeNode.ROOT));

        requestCycle.scheduleRequestHandlerAfterCurrent(this.newRequestHandler());
    }

    // Factories //

    /**
     * Gets the new {@link IRequestHandler} that will respond the list of {@link TreeNode}{@code s} in a JSON format
     *
     * @return the {@link IRequestHandler}
     */
    protected IRequestHandler newRequestHandler() {
        return new TreeViewModelRequestHandler();
    }

    // Classes //

    /**
     * Provides the {@link IRequestHandler}
     */
    protected class TreeViewModelRequestHandler implements IRequestHandler {
        @Override
        public void respond(final IRequestCycle requestCycle) {
            WebResponse response = (WebResponse) requestCycle.getResponse();

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

            if (model != null) {
                List<? extends TreeNode<?>> objects = model.getObject(); // calls load()

                if (objects != null) {
                    StringBuilder builder = new StringBuilder("[ ");

                    for (int index = 0; index < objects.size(); index++) {
                        TreeNode<?> object = objects.get(index);

                        if (index > 0) {
                            builder.append(", ");
                        }

                        builder.append(factory.toJson(index, object));
                    }

                    response.write(builder.append(" ]"));
                }
            }
        }

        @Override
        public void detach(final IRequestCycle requestCycle) {
            model.detach();
        }
    }
}