/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.common.impl;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.*;

public final class MutableHttpServletRequest extends HttpServletRequestWrapper {
	// holds custom header and value mapping
	private final Map<String, String> customHeaders;

	public MutableHttpServletRequest(HttpServletRequest request) {
		super(request);
		this.customHeaders = new HashMap<>();
	}

	public void putHeader(String name, String value) {
		this.customHeaders.put(name, value);
	}

	public String getHeader(String name) {
		// check the custom headers first
		String headerValue = customHeaders.get(name);

		if (headerValue != null) {
			return headerValue;
		}
		// else return from into the original wrapped object
		return ((HttpServletRequest) getRequest()).getHeader(name);
	}

	public Enumeration<String> getHeaderNames() {
		// create a set of the custom header names
		Set<String> set = new HashSet<>(customHeaders.keySet());

		// now add the headers from the wrapped request object
		@SuppressWarnings("unchecked")
		Enumeration<String> e = ((HttpServletRequest) getRequest()).getHeaderNames();
		while (e.hasMoreElements()) {
			// add the names of the request headers into the list
			String n = e.nextElement();
			set.add(n);
		}

		// create an enumeration from the set and return
		return Collections.enumeration(set);
	}
}