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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * 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.catalina.fileupload;

import java.io.Serializable;
import java.util.*;

/**
 * @author Michael C. Macaluso
 * @author Kin-man Chung (Adopted for Glassfish)
 */
class PartHeaders implements Serializable {
    private static final long serialVersionUID = -4455695752627032559L;

    /**
     * Map of String keys to a List of
     * String instances.
     */
    private final Map> headerMap =
        new LinkedHashMap>();

    private Set headerNames = null;

    public String getHeader(String name) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List headerValueList = headerMap.get(nameLower);
        if (null == headerValueList) {
            return null;
        }
        return headerValueList.get(0);
    }

    public synchronized Collection getHeaderNames() {
        if (null == headerNames) {
            headerNames = Collections.unmodifiableSet(headerMap.keySet());
        }
        return headerNames;
    }

    public List getHeaders(String name) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List headerValueList = headerMap.get(nameLower);
        if (null == headerValueList) {
            return Collections.emptyList();
        }
        return headerValueList;
    }

    /**
     * Method to add header values to this instance.
     *
     * @param name name of this header
     * @param value value of this header
     */
    public synchronized void addHeader(String name, String value) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List headerValueList = headerMap.get(nameLower);
        if (null == headerValueList) {
            headerValueList = new ArrayList();
            headerMap.put(nameLower, headerValueList);
        }
        headerValueList.add(value);
    }
}