Commons FileUpload example source code file (FileItemHeadersImpl.java)

This example Commons FileUpload source code file (FileItemHeadersImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons FileUpload tags/keywords

arraylist, arraylist, fileitemheaders, fileitemheadersimpl, hashmap, iterator, iterator, list, list, map, string, string, util

The Commons FileUpload FileItemHeadersImpl.java source code

/*
 * 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.commons.fileupload.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.fileupload.FileItemHeaders;

/**
 * Default implementation of the {@link FileItemHeaders} interface.
 *
 * @author Michael C. Macaluso
 * @since 1.3
 */
public class FileItemHeadersImpl implements FileItemHeaders {
    private static final long serialVersionUID = -4455695752627032559L;

    /**
     * Map of <code>String keys to a List of
     * <code>String instances.
     */
    private final Map headerNameToValueListMap = new HashMap();

    /**
     * List to preserve order of headers as added.  This would not be
     * needed if a <code>LinkedHashMap could be used, but don't
     * want to depend on 1.4.
     */
    private final List headerNameList = new ArrayList();

    /* (non-Javadoc)
     * @see org.apache.commons.fileupload.FileItemHeaders#getHeader(java.lang.String)
     */
    public String getHeader(String name) {
        String nameLower = name.toLowerCase();
        List headerValueList = (List) headerNameToValueListMap.get(nameLower);
        if (null == headerValueList) {
            return null;
        }
        return (String) headerValueList.get(0);
    }

    /* (non-Javadoc)
     * @see org.apache.commons.fileupload.FileItemHeaders#getHeaderNames()
     */
    public Iterator getHeaderNames() {
        return headerNameList.iterator();
    }

    /* (non-Javadoc)
     * @see org.apache.commons.fileupload.FileItemHeaders#getHeaders(java.lang.String)
     */
    public Iterator getHeaders(String name) {
        String nameLower = name.toLowerCase();
        List headerValueList = (List) headerNameToValueListMap.get(nameLower);
        if (null == headerValueList) {
            return Collections.EMPTY_LIST.iterator();
        }
        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();
        List headerValueList = (List) headerNameToValueListMap.get(nameLower);
        if (null == headerValueList) {
            headerValueList = new ArrayList();
            headerNameToValueListMap.put(nameLower, headerValueList);
            headerNameList.add(nameLower);
        }
        headerValueList.add(value);
    }
}