org.apache.myfaces.webapp.filter.servlet.RequestHeaderValuesMap Maven / Gradle / Ivy

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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this version of the Tomahawk library.

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/*
 * 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.myfaces.webapp.filter.servlet;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;


/**
 * HttpServletRequest header values (multi-value headers) as Map of String[].
 * 
 * 
 * NOTE: This class was copied from myfaces impl 
 * org.apache.myfaces.context.servlet and it is
 * used by TomahawkFacesContextWrapper. By that reason, it could change
 * in the future.
 * 
 * 
 * @since 1.1.7
 * @author Anton Koinov (latest modification by $Author: lu4242 $)
 * @version $Revision: 691871 $ $Date: 2008-09-03 23:32:08 -0500 (Wed, 03 Sep 2008) $
 */
public class RequestHeaderValuesMap extends AbstractAttributeMap
{
    private final HttpServletRequest _httpServletRequest;
    private final Map                _valueCache = new HashMap();

    RequestHeaderValuesMap(HttpServletRequest httpServletRequest)
    {
        _httpServletRequest = httpServletRequest;
    }

    protected Object getAttribute(String key)
    {
        Object ret = _valueCache.get(key);
        if (ret == null)
        {
            _valueCache.put(key, ret = toArray(_httpServletRequest
                .getHeaders(key)));
        }

        return ret;
    }

    protected void setAttribute(String key, Object value)
    {
        throw new UnsupportedOperationException(
            "Cannot set HttpServletRequest HeaderValues");
    }

    protected void removeAttribute(String key)
    {
        throw new UnsupportedOperationException(
            "Cannot remove HttpServletRequest HeaderValues");
    }

    protected Enumeration getAttributeNames()
    {
        return _httpServletRequest.getHeaderNames();
    }

    private String[] toArray(Enumeration e)
    {
        List ret = new ArrayList();

        while (e.hasMoreElements())
        {
            ret.add(e.nextElement());
        }

        return (String[]) ret.toArray(new String[ret.size()]);
    }
}