/*
* 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.mashups4jsf.component.youtube;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
import com.googlecode.mashups.services.common.ServiceParameter;
import com.googlecode.mashups.services.factory.YouTubeServicesFactory;
import com.googlecode.mashups.services.youtube.api.YouTubeSearchResultItem;
import com.googlecode.mashups.services.youtube.api.YouTubeSearchService;
import com.googlecode.mashups.services.youtube.api.YouTubeSearchServiceParameters;
import com.googlecode.mashups4jsf.common.util.ComponentConstants;
/**
* @author Hazem Saleh
* @date March. 05, 2010
* The (YouTubeVideoListRenderer) renders youTube video list.
*/
public class YouTubeVideoListRenderer extends Renderer {
private static final String A_ONE_ITEM_FACET_MUST_BE_DEFINED = "A one item facet must be defined";
private static final String YOUTUBE_RESULT_ITEM = "resultItem";
private static final String MAXIMUM_COUNT_SHOULD_BE_GREATER_THAN_ZERO = "Maximum results should be greater than zero!!!";
@Override
public void encodeBegin(FacesContext context, UIComponent component) throws IOException {
if (component.isRendered()) {
try {
ResponseWriter writer = context.getResponseWriter();
YouTubeVideoList youTubeVideoList = (YouTubeVideoList) component;
if (youTubeVideoList.getMaxResults() <= 0) {
throw new IOException(MAXIMUM_COUNT_SHOULD_BE_GREATER_THAN_ZERO);
}
// start encoding the component markup.
writer.startElement (ComponentConstants.DIV_ELEMENT, youTubeVideoList);
writer.writeAttribute(ComponentConstants.ID_ATTRIBUTE, youTubeVideoList.getClientId(context),
ComponentConstants.ID_ATTRIBUTE);
// get the component attributes.
List<ServiceParameter> parameters = new ArrayList<ServiceParameter>();
YouTubeSearchService youTubeSearchService = YouTubeServicesFactory.getYouTubeSearchService();
parameters.add(new ServiceParameter(YouTubeSearchServiceParameters.VERSION, "2"));
parameters.add(new ServiceParameter(YouTubeSearchServiceParameters.MAX_RESULTS, youTubeVideoList.getMaxResults().toString()));
parameters.add(new ServiceParameter(YouTubeSearchServiceParameters.QUERY, youTubeVideoList.getSearchQuery()));
if (youTubeVideoList.getCategory() != null) {
parameters.add(new ServiceParameter(YouTubeSearchServiceParameters.CATEGORY, youTubeVideoList.getCategory()));
}
if (youTubeVideoList.getLocation() != null) {
parameters.add(new ServiceParameter(YouTubeSearchServiceParameters.LOCATION, youTubeVideoList.getLocation()));
}
if (youTubeVideoList.getLocationRadius() != null) {
parameters.add(new ServiceParameter(YouTubeSearchServiceParameters.LOCATION_RADIUS, youTubeVideoList.getLocationRadius()));
}
// perform the actual video search on youTube.
List<YouTubeSearchResultItem> videoResults = youTubeSearchService.getVideoList(parameters);
// encode results .
UIComponent itemFacet = youTubeVideoList.getFacet(YOUTUBE_RESULT_ITEM);
if (itemFacet == null) {
throw new IOException(A_ONE_ITEM_FACET_MUST_BE_DEFINED);
}
Integer index = 0;
for (YouTubeSearchResultItem youTubeSearchResultItem : videoResults) {
context.getApplication().createValueBinding("#{" + youTubeVideoList.getResultItemVar() + "}").setValue(context, youTubeSearchResultItem);
context.getApplication().createValueBinding("#{" + youTubeVideoList.getResultItemIndex() + "}").setValue(context, index++);
encodeRecursive(context, itemFacet);
if (index >= youTubeVideoList.getMaxResults()) {
break;
}
}
} catch (Exception exception) {
throw new IOException("The following exception occurs: " + exception.getMessage());
}
}
}
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
if (component.isRendered()) {
ResponseWriter writer = context.getResponseWriter();
// end encoding the component markup.
writer.endElement(ComponentConstants.DIV_ELEMENT);
}
}
private void encodeRecursive(FacesContext context, UIComponent component) throws IOException {
component.encodeBegin(context);
if (component.getRendersChildren()) {
component.encodeChildren(context);
} else {
for (UIComponent child : (List<UIComponent>) component.getChildren()) {
encodeRecursive(context, child);
}
}
component.encodeEnd(context);
}
}