ContentTypes.java

/*
    Copyright (c) 2015 Wolfgang Imig
    
    This file is part of the library "JOA Issue Tracker for Microsoft Outlook".

    This file must be used according to the terms of   
      
      MIT License, http://opensource.org/licenses/MIT

 */
package com.wilutions.itol;

import java.util.HashMap;

import com.wilutions.com.reg.RegUtil;

public class ContentTypes {

	private static final String CONTENT_TYPE_MSG = "application/vnd.ms-outlook";
	private static final String CONTENT_TYPE_TXT = "text/plain";
	private static final String DEFAULT_CONTENT_TYPE = "application/octet-stream";

	private static final HashMap<String, String> contentTypeToFileExt = new HashMap<String, String>();
	private static final HashMap<String, String> fileExtToContentType = new HashMap<String, String>();

	static {
		add(CONTENT_TYPE_MSG, ".msg");
		add(CONTENT_TYPE_TXT, ".txt");
	}

	public static String getContentType(String fileExt) {
		String contentType = DEFAULT_CONTENT_TYPE;

		if (fileExt != null && fileExt.length() != 0) {

			fileExt = fileExt.toLowerCase();
			if (!fileExt.startsWith(".")) {
				fileExt = "." + fileExt;
			}

			contentType = fileExtToContentType.get(fileExt);
			
			if (contentType == null) {
				contentType = (String) RegUtil.getRegistryValue("HKCR\\" + fileExt, "Content Type",
						DEFAULT_CONTENT_TYPE);
			}

		}

		return contentType;
	}

	public static String getFileExt(String contentType) {
		String fileExt = ".bin";
		String regkey = "HKEY_CLASSES_ROOT\\MIME\\Database\\Content Type\\" + contentType;
		if (contentType != null && contentType.length() != 0) {
			
			contentType = contentType.toLowerCase();
			
			fileExt = contentTypeToFileExt.get(contentType);
			if (fileExt == null) {
				fileExt = (String) RegUtil.getRegistryValue(regkey, "Extension", ".bin");
			}
		}
		return fileExt;
	}

	public static void main(String[] args) {
		System.out.println("msg=" + getContentType(".msg"));
		System.out.println("txt=" + getContentType(".txt"));
		System.out.println(CONTENT_TYPE_MSG + "=" + getFileExt(CONTENT_TYPE_MSG));
		System.out.println("text=" + getFileExt("text/plain"));
	}

	private static void add(String contentType, String fileExt) {
		contentTypeToFileExt.put(contentType, fileExt);
		fileExtToContentType.put(fileExt, contentType);
	}
}