MicrobloggingEmbeddedProvider.java

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

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;

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.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 micro blog messages via a URL or specific install method.
 * 
 * @author Stefan Schmidt
 * @since 1.1
 */
@Component
@Service
public class MicrobloggingEmbeddedProvider extends AbstractEmbeddedProvider {

  public boolean embed(final String url, final String viewName) {
    // Expected format http://twitter.com/#search?q=@SpringRoo
    if (url.contains("twitter.com")) {
      final Map<String, String> options = new HashMap<String, String>();
      options.put("provider", "TWITTER");
      options.put("searchTerm", url.substring(url.indexOf("q=") + 2));
      return install(viewName, options);
    }
    return false;
  }

  public boolean install(final String viewName, final Map<String, String> options) {
    if (options == null || options.size() != 2 || !options.containsKey("provider")
        || !options.get("provider").equalsIgnoreCase("TWITTER")
        || !options.containsKey("searchTerm")) {
      return false;
    }
    String searchTerm = options.get("searchTerm");
    try {
      searchTerm = URLDecoder.decode(searchTerm, "UTF-8");
    } catch (final UnsupportedEncodingException ignore) {
    }
    installTagx("microblogging");
    final Element twitter =
        new XmlElementBuilder("embed:microblogging", XmlUtils.getDocumentBuilder().newDocument())
            .addAttribute("id", "twitter_" + searchTerm).addAttribute("searchTerm", searchTerm)
            .build();
    twitter.setAttribute("z", XmlRoundTripUtils.calculateUniqueKeyFor(twitter));
    installJspx(getViewName(viewName, options.get("provider").toLowerCase()), null, twitter);
    return true;
  }
}