SendTextToServerHandler.java

/**
 * Copyright 2010 ArcBees Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.gwtplatform.samples.basic.server;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import com.google.inject.Inject;
import com.google.inject.Provider;
import com.gwtplatform.dispatch.server.ExecutionContext;
import com.gwtplatform.dispatch.server.actionhandler.ActionHandler;
import com.gwtplatform.dispatch.shared.ActionException;
import com.gwtplatform.samples.basic.shared.FieldVerifier;
import com.gwtplatform.samples.basic.shared.SendTextToServer;
import com.gwtplatform.samples.basic.shared.SendTextToServerResult;

/**
 * @author Philippe Beaudoin
 */
public class SendTextToServerHandler implements
		ActionHandler<SendTextToServer, SendTextToServerResult> {

	private Provider<HttpServletRequest> requestProvider;
	private ServletContext servletContext;

	@Inject
	SendTextToServerHandler(ServletContext servletContext,
			Provider<HttpServletRequest> requestProvider) {
		this.servletContext = servletContext;
		this.requestProvider = requestProvider;
	}

	@Override
	public SendTextToServerResult execute(SendTextToServer action,
			ExecutionContext context) throws ActionException {

		String input = action.getTextToServer();

		// Verify that the input is valid.
		if (!FieldVerifier.isValidName(input)) {
			// If the input is not valid, throw an IllegalArgumentException back
			// to
			// the client.
			throw new ActionException("Name must be at least 4 characters long");
		}

		// String serverInfo = servletContext.getServerInfo();
		// String userAgent = requestProvider.get().getHeader("User-Agent");

		try {
			return new SendTextToServerResult(Parser.parse(input));
		} catch (InvalidCharacterExpection e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return null;
	}

	@Override
	public Class<SendTextToServer> getActionType() {
		return SendTextToServer.class;
	}

	@Override
	public void undo(SendTextToServer action, SendTextToServerResult result,
			ExecutionContext context) throws ActionException {
		// Not undoable
	}

}