MimeTypes.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package org.openspcoop2.utils.mime;

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import org.openspcoop2.utils.UtilsException;

/**
 * Identity
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class MimeTypes {

    private Map<String, Object> mapMimeToExt = new HashMap<>();
    private Map<String, String> mapExtToMime = new HashMap<>();
    
    private MimeTypes() throws UtilsException{
        
        String file = "/org/openspcoop2/utils/mime/mime.types";
        try (InputStream is = MimeTypes.class.getResourceAsStream(file);){
            if(is==null){
                throw new UtilsException("File ["+file+"] in classpath not found");
            }
            init(is, this.mapMimeToExt, this.mapExtToMime);
        }catch(Exception e){
            throw new UtilsException(e.getMessage(),e);
        }
        
    } 
    private static void init(InputStream is, Map<String, Object> mapMimeToExt, Map<String, String> mapExtToMime) throws UtilsException {
        try (
                InputStreamReader ir = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(ir);
            ){
                String line;
                while ((line = br.readLine()) != null) {
                    line = line.trim();
                    if(!line.startsWith("#")){
                        if(line.contains("\t")){
                            throw new UtilsException("Line["+line+"] contains tabs");
                        }
                        String [] tmp = line.split(" "); 
                        if(tmp.length<2){
                            /** System.out.println("TYPE["+tmp[0]+"] without exts"); */
                            mapMimeToExt.put(tmp[0].trim(), org.apache.commons.lang.ObjectUtils.NULL);
                        }else{
                            StringBuilder bf = new StringBuilder();
                            for (int i = 1; i < tmp.length; i++) {
                                bf.append(" EXT-"+i+"=["+tmp[i].trim()+"]");
                                mapExtToMime.put(tmp[i].trim(),tmp[0].trim());
                            }
                            /** System.out.println("TYPE["+tmp[0]+"]"+bf.toString()); */
                            mapMimeToExt.put(tmp[0].trim(), tmp[1].trim());
                        }
                    }
                }
        }catch(Exception e){
            throw new UtilsException(e.getMessage(),e);
        }
    }
    
    public String getMimeType(File file){
        String ext = null;
        try{
            String fileName = file.getName();
            ext = fileName.substring(fileName.lastIndexOf(".")+1,fileName.length());
        }catch(Exception e){
            // close
        }
        if(ext==null){
            ext = "bin";
        }
        return this.getMimeType(ext);
    }
    public String getMimeType(String ext){
        if("xml".equalsIgnoreCase(ext)) {
            return MimeTypeConstants.MEDIA_TYPE_SOAP_1_1;
        }
        else if("json".equalsIgnoreCase(ext)) {
            return MimeTypeConstants.MEDIA_TYPE_JSON;
        }
        return this.mapExtToMime.get(ext.trim().toLowerCase());
    }
    public String getExtension(String mime){
        Object o = this.mapMimeToExt.get(mime.trim().toLowerCase());
        if(o==null){
            return null;
        }
        if(o instanceof org.apache.commons.lang.ObjectUtils.Null){
            return null;
        }
        return (String) o;
    }
    
    public boolean existsExtension(String ext){
        return this.mapExtToMime.containsKey(ext.trim().toLowerCase());
    }
    public boolean existsMimeType(String mime, boolean checkExistsExtension){
        if(this.mapMimeToExt.containsKey(mime.trim().toLowerCase())){
            if(checkExistsExtension){
                String ext = this.getExtension(mime);
                return ext!=null;
            }
            else{
                return true;
            }
        }else{
            return false;
        }
    }
    
    
    
    // static
    
    private static MimeTypes mimeTypes = null;
    private static synchronized void init() throws UtilsException{
        if(mimeTypes==null){
            mimeTypes = new MimeTypes();
        }
    } 
    public static MimeTypes getInstance() throws UtilsException{
        if(mimeTypes==null){
            // spotbugs warning 'SING_SINGLETON_GETTER_NOT_SYNCHRONIZED'
            synchronized (MimeTypes.class) {
                init();
            }
        }
        return mimeTypes;
    }
    
}