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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    * 
    9    *     http://www.apache.org/licenses/LICENSE-2.0
   10    * 
   11    * Unless required by applicable law or agreed to in writing, software 
   12    * distributed under the License is distributed on an "AS IS" BASIS, 
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
   14    * See the License for the specific language governing permissions and 
   15    * limitations under the License.
   16    */
   17   
   18   package org.apache.jdo.util;
   19   
   20   /**
   21    * Helper class providing string utility methods.
   22    */
   23   public class StringHelper {
   24   
   25       /**
   26        * Checks if a string is null or empty.
   27        * @param aString the string to be checked.
   28        * @return <code>true</code> if the string is null or empty after trim,
   29        *         <code>false</code> otherwise.
   30        */
   31       public static boolean isEmpty(String aString) {
   32           return ((aString == null) || (aString.trim().length() == 0));
   33       }
   34   
   35       /**
   36        * Returns the package portion of the specified class
   37        * @param className the name of the class from which to extract the package
   38        * @return package portion of the specified class
   39        */
   40       public static String getPackageName(final String className) {
   41           if (className != null) {
   42               final int index = className.lastIndexOf('.');
   43   
   44               return ((index != -1) ? className.substring(0, index) : ""); // NOI18N
   45           }
   46   
   47           return null;
   48       }
   49   
   50       /**
   51        * Returns the name of a class without the package name.  For example: if
   52        * input = "java.lang.Object" , then output = "Object".
   53        * @param fully qualified classname
   54        * @return the unqualified classname 
   55        */
   56       public static String getShortClassName(final String className) {
   57           if (className != null) {
   58               final int index = className.lastIndexOf('.');
   59   
   60               return className.substring(index + 1);
   61           }
   62           return null;
   63       }
   64   }

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