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/**
 * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
 * 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. See accompanying LICENSE file.
 */
package org.apache.oozie.servlet;

import javax.servlet.http.HttpServletResponse;

import org.apache.oozie.ErrorCode;

public class ServletUtilities {

    /**
     * accessory static method to check the app path parameter for the request
     * used only for job-related request and only one of them should exist
     * 
     * @param wfPath workflow app path
     * @param coordPath coordinator app path
     * @throws XServletException
     */
    protected static void ValidateAppPath(String wfPath, String coordPath) throws XServletException {
        if (wfPath != null && coordPath != null) {
            throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0301, wfPath, coordPath);
        }
        else {
            if (wfPath == null && coordPath == null) {
                throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0302);
            }
        }
    }

    /**
     * accessory static method to check the app path parameter for the request
     * used only for job-related request and only one of them should exist
     * bundle appPath is also checked
     * 
     * @param wfPath workflow app path
     * @param coordPath coordinator app path
     * @param bundlePath bundle app path
     * @throws XServletException
     */
    protected static void ValidateAppPath(String wfPath, String coordPath, String bundlePath) throws XServletException {
        int n = 0;
        
        if (wfPath != null) {
            n ++;
        }
        
        if (coordPath != null) {
            n ++;
        }
        
        if (bundlePath != null) {
            n ++;
        }
        
        if (n != 1) {
            throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0302);
        }
    }

    /**
     * accessory static method to check the lib path parameter for the request
     * 
     * @param libPath lib path
     * @throws XServletException
     */
    protected static void ValidateLibPath(String libPath) throws XServletException {
        if (libPath == null) {
            throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0302);
        }
    }
}