/*

  * Copyright 1999-2001,2004 The Apache Software Foundation.

  * 

  * 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.apache.commons.workflow.util;

 /**

  * General purpose static utility methods for the Workflow engine.

  *

  * @version $Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $

  * @author Craig R. McClanahan

  */

 public class WorkflowUtils {

     /**

      * Parse the character encoding from the specified content type header.

      * If the content type is null, or there is no explicit character encoding,

      * <code>null</code> is returned.

      *

      * @param contentType a content type header

      */

     public static String parseCharacterEncoding(String contentType) {

         if (contentType == null)

             return (null);

         int start = contentType.indexOf("charset=");

         if (start < 0)

             return (null);

         String encoding = contentType.substring(start + 8);

         int end = encoding.indexOf(';');

         if (end >= 0)

             encoding = encoding.substring(0, end);

         encoding = encoding.trim();

         if ((encoding.length() > 2) && (encoding.startsWith("\""))

             && (encoding.endsWith("\"")))

             encoding = encoding.substring(1, encoding.length() - 1);

         return (encoding.trim());

     }

 }