    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
    20  import javax.servlet.jsp.PageContext;
    21
    22  /***
    23   * A lightweight wrapper for PageContext that restricts access
    24   * to attributes of the "page" scope.  This object is needed so that
    25   * XPath "foo" would lookup the attribute "foo" in all scopes, while
    26   * "$page/foo" would only look in the "page" scope.
    27   *
    28   * @author Dmitri Plotnikov
    29   * @version $Revision: 1.5 $ $Date: 2004/02/29 14:17:40 $
    30   */
    31  public class PageScopeContext {
    32      private PageContext pageContext;
    33
    34      public PageScopeContext(PageContext pageContext) {
    35          this.pageContext = pageContext;
    36      }
    37
    38      /***
    39       * Returns attributes of the pageContext declared in the "page" scope.
    40       */
    41      public Enumeration getAttributeNames() {
    42          return pageContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
    43      }
    44
    45      public Object getAttribute(String attribute) {
    46          return pageContext.getAttribute(attribute, PageContext.PAGE_SCOPE);
    47      }
    48
    49      public void setAttribute(String attribute, Object value) {
    50          pageContext.setAttribute(attribute, value, PageContext.PAGE_SCOPE);
    51      }
    52  }