VideoStreamEmbeddedProvider.java

package org.springframework.roo.addon.web.mvc.embedded.provider;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Service;
import org.springframework.roo.addon.web.mvc.embedded.AbstractEmbeddedProvider;
import org.springframework.roo.addon.web.mvc.embedded.EmbeddedCompletor;
import org.springframework.roo.support.util.XmlElementBuilder;
import org.springframework.roo.support.util.XmlRoundTripUtils;
import org.springframework.roo.support.util.XmlUtils;
import org.w3c.dom.Element;

/**
 * Provider to embed video streams via a URL or specific install method.
 * 
 * @author Stefan Schmidt
 * @since 1.1
 */
@Component
@Service
public class VideoStreamEmbeddedProvider extends AbstractEmbeddedProvider {

  public enum VideoStreamProvider implements EmbeddedCompletor {
    LIVESTREAM, USTREAM;

    @Override
    public String toString() {
      final ToStringBuilder builder = new ToStringBuilder(this);
      builder.append("provider", name());
      return builder.toString();
    }
  }

  public boolean embed(final String url, final String viewName) {
    if (url.contains("ustream.tv")) {
      // Expected format http://www.ustream.tv/flash/live/1/4424524
      final String[] split = url.split("/");
      if (split.length > 6) {
        final Map<String, String> options = new HashMap<String, String>();
        options.put("provider", VideoStreamProvider.USTREAM.name());
        options.put("id", split[6]);
        return install(viewName, options);
      }
      return false;
    } else if (url.contains("livestream.com")) {
      // Expected format http://www.livestream.com/wkrg_oil_spill
      final String[] split = url.split("/");
      if (split.length > 3) {
        final Map<String, String> options = new HashMap<String, String>();
        options.put("provider", VideoStreamProvider.LIVESTREAM.name());
        options.put("id", split[3]);
        return install(viewName, options);
      }
      return false;
    }
    return false;
  }

  public boolean install(final String viewName, final Map<String, String> options) {
    if (options == null || options.size() != 2 || !options.containsKey("provider")
        || !options.containsKey("id")) {
      return false;
    }
    final String provider = options.get("provider");
    if (!isProviderSupported(provider, VideoStreamProvider.values())) {
      return false;
    }
    final String id = options.get("id");
    installTagx("videostream");
    final Element video =
        new XmlElementBuilder("embed:videostream", XmlUtils.getDocumentBuilder().newDocument())
            .addAttribute("id", "video_stream_" + id).addAttribute("streamId", id)
            .addAttribute("provider", provider.toLowerCase()).build();
    video.setAttribute("z", XmlRoundTripUtils.calculateUniqueKeyFor(video));
    installJspx(getViewName(viewName, provider.toLowerCase()), null, video);
    return true;
  }
}