PartHeaders.java

/*
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 * obtain a copy of the License at
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 * this work for additional information regarding copyright ownership.
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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 <code>String</code> keys to a <code>List</code> of
     * <code>String</code> instances.
     */
    private final Map<String, List<String>> headerMap =
        new LinkedHashMap<String, List<String>>();

    private Set<String> headerNames = null;

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

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

    public List<String> getHeaders(String name) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List<String> 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<String> headerValueList = headerMap.get(nameLower);
        if (null == headerValueList) {
            headerValueList = new ArrayList<String>();
            headerMap.put(nameLower, headerValueList);
        }
        headerValueList.add(value);
    }
}