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the hasor Web project.
There is a newer version: 4.2.5
/*
 * 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 net.hasor.web.upload.util;
import net.hasor.web.FileItemHeaders;

import java.util.*;
/**
 * Default implementation of the {@link FileItemHeaders} interface.
 * @since 1.2.1
 * @version $Id: HeadersSet.java 1458379 2013-03-19 16:16:47Z britter $
 */
public class HeadersSet implements FileItemHeaders {
    /**
     * Map of String keys to a List of
     * String instances.
     */
    private final Map> headerNameToValueListMap = new LinkedHashMap>();
    /**
     * {@inheritDoc}
     */
    public String getHeader(String name) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List headerValueList = headerNameToValueListMap.get(nameLower);
        if (null == headerValueList) {
            return null;
        }
        return headerValueList.get(0);
    }
    /**
     * {@inheritDoc}
     */
    public Iterator getHeaderNames() {
        return headerNameToValueListMap.keySet().iterator();
    }
    /**
     * {@inheritDoc}
     */
    public Iterator getHeaders(String name) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List headerValueList = headerNameToValueListMap.get(nameLower);
        if (null == headerValueList) {
            headerValueList = Collections.emptyList();
        }
        return headerValueList.iterator();
    }
    /**
     * 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);
        headerNameToValueListMap.computeIfAbsent(nameLower, k -> new ArrayList<>()).add(value);
    }
}