BoxMeRequestHandler.java

package hackathon.boxme;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import com.fasterxml.jackson.databind.ObjectMapper;

public class BoxMeRequestHandler {
	private List<Method> storageServiceApis;
	private List<Method> registrationRequestApis;
	
	public BoxMeRequestHandler() {
		storageServiceApis = new ArrayList<Method>();
		storageServiceApis.addAll(Arrays.asList(
				StorageServiceHandler.class.getMethods()));
		registrationRequestApis = new ArrayList<Method>();
		registrationRequestApis.addAll(Arrays.asList(
				RegistrationRequestHandler.class.getMethods()));
	}
	
	/**
	 * Handle the request and return the String that will be sent
	 * back to the caller.
	 * @return the JSON object returned.
	 * @throws NoSuchMethodException 
	 */
	public String handle(BoxMeRequest request) throws NoSuchMethodException {
		String handledOutput = null;
		handledOutput = tryToHandle(request, storageServiceApis, new StorageServiceHandler());
		if (handledOutput != null) {
			return handledOutput;
		}
		handledOutput = tryToHandle(request, registrationRequestApis, new RegistrationRequestHandler());
		if (handledOutput != null) {
			return handledOutput;
		}
		throw new NoSuchMethodException();
	}

	private String tryToHandle(BoxMeRequest request,
			List<Method> handlers, Object invokeUpon) {
		for (Method m : handlers) {
			if (m.getName().equals(request.requestType)) {
				Object retVal = null;
				try {
					retVal = m.invoke(invokeUpon, request.requestParameters);
				} catch (Exception e) {
					e.printStackTrace();
				}
				ObjectMapper mapper = new ObjectMapper();
				try {
					String s = mapper.writeValueAsString(retVal);
					System.out.println(s);
					return s;
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return null;
	}
}