SendTextToServerHandler.java

/*
 * Copyright 2011 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.basicspring.server.dispatch;

import javax.servlet.ServletContext;

import org.springframework.beans.factory.annotation.Autowired;

import com.gwtplatform.dispatch.rpc.server.ExecutionContext;
import com.gwtplatform.dispatch.rpc.server.actionhandler.AbstractActionHandler;
import com.gwtplatform.dispatch.shared.ActionException;
import com.gwtplatform.samples.basicspring.shared.FieldVerifier;
import com.gwtplatform.samples.basicspring.shared.dispatch.SendTextToServerAction;
import com.gwtplatform.samples.basicspring.shared.dispatch.SendTextToServerResult;

public class SendTextToServerHandler extends AbstractActionHandler<SendTextToServerAction, SendTextToServerResult> {
    @Autowired
    private ServletContext servletContext;

    public SendTextToServerHandler() {
        super(SendTextToServerAction.class);
    }

    @Override
    public SendTextToServerResult execute(SendTextToServerAction 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();
        return new SendTextToServerResult("Hello, " + input + "!<br><br>I am running " + serverInfo);
    }

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

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