    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *     http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.jxpath.servlet;
    019
    020import java.util.ArrayList;
    021import java.util.Enumeration;
    022
    023import org.apache.commons.jxpath.DynamicPropertyHandler;
    024
    025/**
    026 * Implementation of the {@link DynamicPropertyHandler} interface that provides access to attributes of a {@link PageScopeContext}.
    027 */
    028public class PageScopeContextHandler implements DynamicPropertyHandler {
    029
    030    private static final int DEFAULT_LIST_SIZE = 16;
    031
    032    /**
    033     * Constructs a new instance.
    034     */
    035    public PageScopeContextHandler() {
    036        // empty
    037    }
    038
    039    @Override
    040    public Object getProperty(final Object pageScope, final String property) {
    041        return ((PageScopeContext) pageScope).getAttribute(property);
    042    }
    043
    044    @Override
    045    public String[] getPropertyNames(final Object pageScope) {
    046        final Enumeration<String> e = ((PageScopeContext) pageScope).getAttributeNames();
    047        final ArrayList<String> list = new ArrayList<>(DEFAULT_LIST_SIZE);
    048        while (e.hasMoreElements()) {
    049            list.add(e.nextElement());
    050        }
    051        return list.toArray(new String[list.size()]);
    052    }
    053
    054    @Override
    055    public void setProperty(final Object pageScope, final String property, final Object value) {
    056        ((PageScopeContext) pageScope).setAttribute(property, value);
    057    }
    058}