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Core functionality of the framework

There is a newer version: 3.5-j11

/*
Copyright 2009-2010 Igor Polevoy 

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 org.javalite.activeweb;

import org.javalite.activeweb.annotations.DELETE;
import org.javalite.activeweb.annotations.GET;
import org.javalite.activeweb.annotations.POST;
import org.javalite.activeweb.annotations.PUT;

import javax.servlet.http.HttpServletRequest;
import java.lang.annotation.Annotation;

/**
 * @author Igor Polevoy
 */
public enum HttpMethod {
    GET, POST, PUT, DELETE;

    public static HttpMethod method(Annotation annotation){

        if(annotation instanceof GET){
            return GET;
        }
        else if(annotation instanceof POST){
            return POST;
        }
        if(annotation instanceof PUT){
            return PUT;
        }
        if(annotation instanceof DELETE){
            return DELETE;
        }
        else{
            throw new IllegalArgumentException("allowable annotations: @GET, @POST, @PUT, @DELETE, all from 'activeweb.annotations' package.");
        }
    }

    /**
     * Detects an HTTP method from a request.
     *
     * @param request
     * @return
     */
    static HttpMethod getMethod(HttpServletRequest request){
        String methodParam = request.getParameter("_method");
        String requestMethod = request.getMethod();
        requestMethod = requestMethod.equalsIgnoreCase("POST") && methodParam != null && methodParam.equalsIgnoreCase("DELETE")? "DELETE" : requestMethod;
        requestMethod = requestMethod.equalsIgnoreCase("POST") && methodParam != null && methodParam.equalsIgnoreCase("PUT")? "PUT" : requestMethod;
        return HttpMethod.valueOf(requestMethod.toUpperCase());
    }
}