/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package frame.upload.util;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import frame.upload.FileItemHeaders;
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/**
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* Default implementation of the {@link FileItemHeaders} interface.
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*
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* @author Michael C. Macaluso
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* @since 1.3
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*/
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public class FileItemHeadersImpl implements FileItemHeaders, Serializable {
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private static final long serialVersionUID = -4455695752627032559L;
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/**
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* Map of <code>String</code> keys to a <code>List</code> of
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* <code>String</code> instances.
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*/
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private final Map headerNameToValueListMap = new HashMap();
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/**
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* List to preserve order of headers as added. This would not be
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* needed if a <code>LinkedHashMap</code> could be used, but don't
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* want to depend on 1.4.
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*/
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private final List headerNameList = new ArrayList();
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public String getHeader(String name) {
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String nameLower = name.toLowerCase();
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List headerValueList = (List) headerNameToValueListMap.get(nameLower);
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if (null == headerValueList) {
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return null;
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}
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return (String) headerValueList.get(0);
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}
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public Iterator getHeaderNames() {
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return headerNameList.iterator();
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}
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public Iterator getHeaders(String name) {
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String nameLower = name.toLowerCase();
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List headerValueList = (List) headerNameToValueListMap.get(nameLower);
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if (null == headerValueList) {
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return Collections.EMPTY_LIST.iterator();
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}
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return headerValueList.iterator();
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}
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/**
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* Method to add header values to this instance.
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*
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* @param name name of this header
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* @param value value of this header
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*/
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public synchronized void addHeader(String name, String value) {
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String nameLower = name.toLowerCase();
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List headerValueList = (List) headerNameToValueListMap.get(nameLower);
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if (null == headerValueList) {
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headerValueList = new ArrayList();
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headerNameToValueListMap.put(nameLower, headerValueList);
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headerNameList.add(nameLower);
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}
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headerValueList.add(value);
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}
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}
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