    1   /*
    2    * Copyright 1999-2004 The Apache Software Foundation
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package org.apache.commons.jxpath.servlet;
    17
    18  import java.util.Enumeration;
    19  import java.util.HashSet;
    20
    21  import javax.servlet.ServletContext;
    22
    23  import org.apache.commons.jxpath.DynamicPropertyHandler;
    24
    25  /***
    26   * Implementation of the DynamicPropertyHandler interface that provides
    27   * access to attributes of a ServletContext.
    28   *
    29   * @author Dmitri Plotnikov
    30   * @version $Revision: 1.6 $ $Date: 2004/05/08 15:10:49 $
    31   */
    32  public class ServletContextHandler implements DynamicPropertyHandler {
    33
    34      private static final String[] STRING_ARRAY = new String[0];
    35
    36      public String[] getPropertyNames(Object context) {
    37          HashSet list = new HashSet(16);
    38          collectPropertyNames(list, context);
    39          return (String[]) list.toArray(STRING_ARRAY);
    40      }
    41
    42      protected void collectPropertyNames(HashSet set, Object bean) {
    43          Enumeration e = ((ServletContext) bean).getAttributeNames();
    44          while (e.hasMoreElements()) {
    45              set.add(e.nextElement());
    46          }
    47      }
    48
    49      public Object getProperty(Object context, String property) {
    50          return ((ServletContext) context).getAttribute(property);
    51      }
    52
    53      public void setProperty(Object context, String property, Object value) {
    54          ((ServletContext) context).setAttribute(property, value);
    55      }
    56  }