/*
 * Copyright 2004-2012 the original author or authors.
 *
 * Licensed 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.springframework.webflow.context.servlet;

import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;

import org.springframework.binding.collection.StringKeyedMapAdapter;
import org.springframework.webflow.core.collection.CollectionUtils;

/**
 * Map backed by the Servlet HTTP request attribute map for accessing request local attributes.
 * 
 * @author Keith Donald
 */
public class HttpServletRequestMap extends StringKeyedMapAdapter<Object> {

	/**
	 * The wrapped HTTP request.
	 */
	private HttpServletRequest request;

	/**
	 * Create a new map wrapping the attributes of given request.
	 */
	public HttpServletRequestMap(HttpServletRequest request) {
		this.request = request;
	}

	protected Object getAttribute(String key) {
		return request.getAttribute(key);
	}

	protected void setAttribute(String key, Object value) {
		request.setAttribute(key, value);
	}

	protected void removeAttribute(String key) {
		request.removeAttribute(key);
	}

	@SuppressWarnings("unchecked")
	protected Iterator<String> getAttributeNames() {
		return CollectionUtils.toIterator(request.getAttributeNames());
	}
}