com.googlecode.wicket.kendo.ui.repeater.DataProviderBehavior.java Source code

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Here is the source code for com.googlecode.wicket.kendo.ui.repeater.DataProviderBehavior.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.repeater;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.apache.wicket.Component;
import org.apache.wicket.markup.repeater.data.IDataProvider;
import org.apache.wicket.request.IRequestParameters;

import com.googlecode.wicket.jquery.core.Options;
import com.googlecode.wicket.jquery.core.behavior.AjaxCallbackBehavior;
import com.googlecode.wicket.jquery.core.renderer.ITextRenderer;
import com.googlecode.wicket.jquery.core.template.IJQueryTemplate;
import com.googlecode.wicket.jquery.core.utils.BuilderUtils;
import com.googlecode.wicket.jquery.core.utils.ListUtils;

/**
 * Provides the {@link IDataProvider} data source {@link AjaxCallbackBehavior}
 *
 * @param <T> the type of the model object
 * @author Sebastien Briquet - sebfz1
 */
public class DataProviderBehavior<T> extends AjaxCallbackBehavior {
    private static final long serialVersionUID = 1L;

    private final IDataProvider<T> provider;
    private final ITextRenderer<? super T> renderer;
    private final IJQueryTemplate template;

    /**
     * Constructor
     *
     * @param provider the {@link IDataProvider}
     * @param renderer the {@link ITextRenderer}
     */
    public DataProviderBehavior(final IDataProvider<T> provider, ITextRenderer<? super T> renderer) {
        this(provider, renderer, null);
    }

    /**
     * Constructor
     *
     * @param provider the {@link IDataProvider}
     * @param renderer the {@link ITextRenderer}
     * @param template the {@link IJQueryTemplate}
     */
    public DataProviderBehavior(final IDataProvider<T> provider, ITextRenderer<? super T> renderer,
            IJQueryTemplate template) {
        this.provider = provider;
        this.renderer = renderer;
        this.template = template;
    }

    /**
     * Gets the property set that should be appended to the JSON response.<br>
     * The value corresponding to the property is retrieved from the {@link ITextRenderer#getText(Object, String)}
     *
     * @return the property list
     */
    protected List<String> getProperties() {
        if (this.template != null) {
            return ListUtils.exclude(this.template.getTextProperties(), this.renderer.getFields()); // #198
        }

        return Collections.emptyList();
    }

    @Override
    protected String getResponse(IRequestParameters parameters) {
        final int first = parameters.getParameterValue("skip").toInt(0);
        final int count = parameters.getParameterValue("take").toInt(Short.MAX_VALUE);

        final long size = this.provider.size();
        final Iterator<? extends T> iterator = this.provider.iterator(first, count);

        // builds JSON result //
        StringBuilder builder = new StringBuilder();
        builder.append("{ ");
        BuilderUtils.append(builder, "__count", size);
        builder.append(", ");
        builder.append(Options.QUOTE).append("results").append(Options.QUOTE).append(": ");
        builder.append("[ ");

        if (iterator != null) {
            for (int index = 0; iterator.hasNext(); index++) {
                T object = iterator.next();

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

                builder.append("{ ");

                // ITextRenderer //
                builder.append(this.renderer.render(object));

                // Additional properties (like template properties) //
                for (String property : this.getProperties()) {
                    builder.append(", ");
                    BuilderUtils.append(builder, property, this.renderer.getText(object, property));
                }

                builder.append(" }");
            }
        }

        builder.append(" ] }");

        return builder.toString();
    }

    @Override
    public void detach(Component component) {
        super.detach(component);

        this.provider.detach();
    }
}