001 /* 002 * Copyright 1999-2001,2004 The Apache Software Foundation. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017 package org.apache.commons.workflow.util; 018 019 020 /** 021 * General purpose static utility methods for the Workflow engine. 022 * 023 * @version $Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $ 024 * @author Craig R. McClanahan 025 */ 026 027 public class WorkflowUtils { 028 029 030 /** 031 * Parse the character encoding from the specified content type header. 032 * If the content type is null, or there is no explicit character encoding, 033 * <code>null</code> is returned. 034 * 035 * @param contentType a content type header 036 */ 037 public static String parseCharacterEncoding(String contentType) { 038 039 if (contentType == null) 040 return (null); 041 int start = contentType.indexOf("charset="); 042 if (start < 0) 043 return (null); 044 String encoding = contentType.substring(start + 8); 045 int end = encoding.indexOf(';'); 046 if (end >= 0) 047 encoding = encoding.substring(0, end); 048 encoding = encoding.trim(); 049 if ((encoding.length() > 2) && (encoding.startsWith("\"")) 050 && (encoding.endsWith("\""))) 051 encoding = encoding.substring(1, encoding.length() - 1); 052 return (encoding.trim()); 053 054 } 055 056 057 }