com.talvish.tales.services.http.servlets.AdministrationServlet.java Source code

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Here is the source code for com.talvish.tales.services.http.servlets.AdministrationServlet.java

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// ***************************************************************************
// *  Copyright 2012 Joseph Molnar
// *
// *  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.talvish.tales.services.http.servlets;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

import com.google.common.base.Preconditions;
import com.talvish.tales.services.Service;
import com.talvish.tales.services.http.AttributeConstants;

@SuppressWarnings("serial")
public abstract class AdministrationServlet extends HttpServlet {
    private Service service;

    /**
     * Override for initialization to ensure we have a service.
     */
    @Override
    public void init() throws ServletException {
        super.init();
        service = (Service) this.getServletContext().getAttribute(AttributeConstants.SERVICE_SERVLET_CONTEXT);
        Preconditions.checkState(getService() != null, "Must have a service to use administrative servlets.");
    }

    /**
     * Returns the HttpService this servlet helps administer.
     * @return the service
     */
    protected Service getService() {
        return service;
    }
}