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package com.googlecode.gwt.test.internal.handlers;

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

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.RemoteService;
import com.googlecode.gwt.test.exceptions.GwtTestConfigurationException;
import com.googlecode.gwt.test.internal.utils.WebXmlUtils;
import com.googlecode.gwt.test.rpc.RemoteServiceCreateHandler;
import com.googlecode.gwt.test.utils.GwtReflectionUtils;

/**
 * GwtCreateHandler for {@link RemoteService} instances which would have been declared in the
 * web.xml file.
 * 
 * @author Gael Lazzari
 * 
 */
class WebXmlRemoteServiceCreateHandler extends RemoteServiceCreateHandler {

   // a map with servletUrl as key and serviceImpl instance as value
   private final Map servicesImplMap = new HashMap();

   /*
    * (non-Javadoc)
    * 
    * @see com.googlecode.gwt.test.server.RemoteServiceCreateHandler#findService(java .lang .Class,
    * java.lang.String)
    */
   @Override
   protected Object findService(Class remoteServiceClass, String remoteServiceRelativePath) {

      String servletPath = "/" + GWT.getModuleName() + "/" + remoteServiceRelativePath;

      Object serviceImpl = servicesImplMap.get(servletPath);

      if (serviceImpl != null) {
         return serviceImpl;
      }

      String className = WebXmlUtils.get().getServletClass(servletPath);

      if (className == null) {
         return null;
      }

      try {
         serviceImpl = GwtReflectionUtils.instantiateClass(GwtReflectionUtils.getClass(className.trim()));
      } catch (ClassNotFoundException e) {
         // should not happen..
         throw new GwtTestConfigurationException(e);
      }

      // cache the implementation
      servicesImplMap.put(servletPath, serviceImpl);

      return serviceImpl;
   }

}