GetProductHandler.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.mobile.server.dispatch;

import javax.inject.Inject;

import com.gwtplatform.dispatch.rpc.server.ExecutionContext;
import com.gwtplatform.dispatch.rpc.server.actionhandler.ActionHandler;
import com.gwtplatform.dispatch.shared.ActionException;
import com.gwtplatform.samples.mobile.server.ProductDatabase;
import com.gwtplatform.samples.mobile.shared.dispatch.GetProductAction;
import com.gwtplatform.samples.mobile.shared.dispatch.GetProductResult;
import com.gwtplatform.samples.mobile.shared.dispatch.Product;

public class GetProductHandler implements ActionHandler<GetProductAction, GetProductResult> {
    private final ProductDatabase database;

    @Inject
    GetProductHandler(
            ProductDatabase database) {
        this.database = database;
    }

    @Override
    public GetProductResult execute(final GetProductAction action, final ExecutionContext context)
            throws ActionException {
        Product product = database.get(action.getId());

        if (product == null) {
            throw new ActionException("Product not found");
        }

        return new GetProductResult(product);
    }

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

    @Override
    public void undo(final GetProductAction action, final GetProductResult result, final ExecutionContext context)
            throws ActionException {
        // No undo
    }
}