/*
 * 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.test.mock;

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;

class _RequestHeaderValuesMap extends _AbstractAttributeMap
{
    private final HttpServletRequest _httpServletRequest;
    private final Map _valueCache = new HashMap();

    _RequestHeaderValuesMap(final HttpServletRequest httpServletRequest)
    {
        _httpServletRequest = httpServletRequest;
    }

    protected Object getAttribute(final String key)
    {
        String[] ret = (String[])_valueCache.get(key);
        if (ret == null)
        {
            _valueCache.put(key, ret = toArray(_httpServletRequest.getHeaders(key)));
        }

        return ret;
    }

    protected void setAttribute(final String key, final Object value)
    {
        throw new UnsupportedOperationException("Cannot set HttpServletRequest HeaderValues");
    }

    protected void removeAttribute(final 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()]);
    }
}