MedeniyeRequestBuilder.java

/**
 * 
 */
package name.webdizz.clt.crx.client.translation.medeniye;

import name.webdizz.clt.crx.client.translation.ITranslationHandler;
import name.webdizz.clt.crx.client.translation.TranslationResult;

import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;

/**
 * Requests translations from medeniye.org dictionary and call
 * {@link ITranslationHandler} with translation result.
 * 
 * @author webdizz
 * 
 */
public class MedeniyeRequestBuilder {

	private class TranslationRequestCallback implements RequestCallback {
		private ITranslationHandler handler;

		private TranslationRequestCallback(ITranslationHandler handler) {
			this.handler = handler;
		}

		public void onResponseReceived(final Request request, final Response response) {
			String translationHtmlText = response.getText();
			TranslationResult translationResult = new TranslationResultCreator().parse(translationHtmlText);
			handler.onTranslate(translationResult);
		}

		public void onError(final Request request, final Throwable exception) {
			// TODO: handle error [webdizz]
		}

	}

	private static final String URL = "http://qlugat.appspot.com/lugat/get?";

	private RequestBuilder requestBuilder;

	/**
	 * Creates default {@link RequestBuilder}.
	 * 
	 * @param requestData
	 *            parameters as a string to pass to remote service
	 */
	private void createDefaultRequestBuilder(String requestData) {
		requestBuilder = new RequestBuilder(RequestBuilder.GET, URL + requestData);
	}

	/**
	 * @param requestData
	 * @param handler
	 * @return ` * @throws RequestException
	 */
	public Request send(final String requestData, final ITranslationHandler handler) throws RequestException {
		if (null == requestBuilder) {
			createDefaultRequestBuilder(requestData);
		}
		TranslationRequestCallback callback = new TranslationRequestCallback(handler);
		requestBuilder.setCallback(callback);
		return requestBuilder.send();
	}

	/**
	 * @param requestBuilder
	 *            the {@link RequestBuilder} to set
	 */
	public void setRequestBuilder(final RequestBuilder requestBuilder) {
		this.requestBuilder = requestBuilder;
	}

}