Apache CXF example source code file (HttpHeaderHelper.java)

This example Apache CXF source code file (HttpHeaderHelper.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 - Apache CXF tags/keywords

authorization, authorization, connection, connection, content-encoding, content-length, content-type, cookie, httpheaderhelper, iso88591, string, string, threading, threads, transfer-encoding, transfer-encoding, util

The Apache CXF HttpHeaderHelper.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.cxf.helpers;

import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import java.nio.charset.UnsupportedCharsetException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public final class HttpHeaderHelper {
    public static final String ACCEPT_ENCODING = "Accept-Encoding";
    public static final String CONTENT_TYPE = "Content-Type";
    public static final String CONTENT_ID = "Content-ID";
    public static final String CONTENT_ENCODING = "Content-Encoding";
    public static final String CONTENT_LENGTH = "Content-Length";
    public static final String CONTENT_TRANSFER_ENCODING = "Content-Transfer-Encoding";
    public static final String COOKIE = "Cookie";
    public static final String TRANSFER_ENCODING = "Transfer-Encoding";
    public static final String CHUNKED = "chunked";
    public static final String CONNECTION = "Connection";
    public static final String CLOSE = "close";
    public static final String AUTHORIZATION = "Authorization";
    private static final String ISO88591 = Charset.forName("ISO-8859-1").name();
    
    private static Map<String, String> internalHeaders = new HashMap();
    private static Map<String, String> encodings = new ConcurrentHashMap();
    
    static {
        internalHeaders.put("Accept-Encoding", "accept-encoding");
        internalHeaders.put("Content-Encoding", "content-encoding");
        internalHeaders.put("Content-Type", "content-type");
        internalHeaders.put("Content-ID", "content-id");
        internalHeaders.put("Content-Transfer-Encoding", "content-transfer-encoding"); 
        internalHeaders.put("Transfer-Encoding", "transfer-encoding");
        internalHeaders.put("Connection", "connection");
        internalHeaders.put("authorization", "Authorization");
        internalHeaders.put("soapaction", "SOAPAction");
        internalHeaders.put("accept", "Accept");
        internalHeaders.put("content-length", "Content-Length");
    }
    
    private HttpHeaderHelper() {
        
    }
    
    public static List<String> getHeader(Map> headerMap, String key) {
        return headerMap.get(getHeaderKey(key));
    }
    
    public static String getHeaderKey(String key) {
        if (internalHeaders.containsKey(key)) {
            return internalHeaders.get(key);
        } else {
            return key;
        }
    }
    
    public static String findCharset(String contentType) {
        if (contentType == null) {
            return null;
        }
        int idx = contentType.indexOf("charset=");
        if (idx != -1) {
            String charset = contentType.substring(idx + 8);
            if (charset.indexOf(";") != -1) {
                charset = charset.substring(0, charset.indexOf(";")).trim();
            }
            if (charset.charAt(0) == '\"') {
                charset = charset.substring(1, charset.length() - 1);
            }
            return charset;
        }
        return null;
    }
    public static String mapCharset(String enc) {
        return mapCharset(enc, ISO88591);
    }    
    
    //helper to map the charsets that various things send in the http Content-Type header 
    //into something that is actually supported by Java and the Stax parsers and such.
    public static String mapCharset(String enc, String deflt) {
        if (enc == null) {
            return deflt;
        }
        //older versions of tomcat don't properly parse ContentType headers with stuff
        //after charset="UTF-8"
        int idx = enc.indexOf(";");
        if (idx != -1) {
            enc = enc.substring(0, idx);
        }
        // Charsets can be quoted. But it's quite certain that they can't have escaped quoted or
        // anything like that.
        enc = enc.replace("\"", "").trim();
        enc = enc.replace("'", "");
        if ("".equals(enc)) {
            return deflt;
        }
        String newenc = encodings.get(enc);
        if (newenc == null) {
            try {
                newenc = Charset.forName(enc).name();
            } catch (IllegalCharsetNameException icne) {
                return null;
            } catch (UnsupportedCharsetException uce) {
                return null;
            }
            encodings.put(enc, newenc);
        }
        return newenc;
    }
}