Commons JXPath example source code file (ServletContextHandler.java)

This example Commons JXPath source code file (ServletContextHandler.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons JXPath tags/keywords

default_property_count, dynamicpropertyhandler, enumeration, hashset, hashset, object, object, servlet, servletcontext, servletcontext, servletcontexthandler, string, string, util

The Commons JXPath ServletContextHandler.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.jxpath.servlet;

import java.util.Enumeration;
import java.util.HashSet;

import javax.servlet.ServletContext;

import org.apache.commons.jxpath.DynamicPropertyHandler;

/**
 * Implementation of the {@link DynamicPropertyHandler} interface that provides
 * access to attributes of a {@link ServletContext}.
 *
 * @author Dmitri Plotnikov
 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
 */
public class ServletContextHandler implements DynamicPropertyHandler {

    private static final int DEFAULT_PROPERTY_COUNT = 16;

    public String[] getPropertyNames(Object context) {
        HashSet list = new HashSet(DEFAULT_PROPERTY_COUNT);
        collectPropertyNames(list, context);
        return (String[]) list.toArray(new String[list.size()]);
    }

    /**
     * Collect the property names from bean, storing in set.
     * @param set destination
     * @param bean to read
     */
    protected void collectPropertyNames(HashSet set, Object bean) {
        Enumeration e = ((ServletContext) bean).getAttributeNames();
        while (e.hasMoreElements()) {
            set.add(e.nextElement());
        }
    }

    public Object getProperty(Object context, String property) {
        return ((ServletContext) context).getAttribute(property);
    }

    public void setProperty(Object context, String property, Object value) {
        ((ServletContext) context).setAttribute(property, value);
    }
}