--- a
+++ b/util/DCNOMIMUMLSIDmap.java
@@ -0,0 +1,142 @@
+package util;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * This class provides disease mapping between DCN and OMIM disease
+ * @author zhengc
+ *
+ */
+public class DCNOMIMUMLSIDmap {
+
+	public static Map<String, List<String>> dcnidnamemap = new HashMap<>();
+	public static Map<String, String> dcnnameidmap = new HashMap<>();
+	public static Map<String, List<String>> omimidnamemap = new HashMap<>();
+	public static Map<String, String> omimnameidmap = new HashMap<>();
+	
+	private static Map<String, List<String>> DCN_OMIM = new HashMap<>();
+	
+	/**
+	 * Initiates and creates a DCNOMIMUMLSIDmap object
+	 * @param DCN_disease DCN disease name
+	 * @param OMIM_dispattern OMIM disease name pattern that equals DCN disease name
+	 */
+	public DCNOMIMUMLSIDmap(String DCN_disease, String OMIM_dispattern) {
+		
+		String DCN_id = dcnnameidmap.get(DCN_disease);
+		
+		List<String> OMIM_ids = new ArrayList<>();
+		for (String dis : omimnameidmap.keySet()) {
+			if (dis.contains(OMIM_dispattern)) {
+				OMIM_ids.add(omimnameidmap.get(dis));
+			}	
+		}
+		Collections.sort(OMIM_ids);
+		DCN_OMIM.put(DCN_id, OMIM_ids);
+		
+	}
+	
+	/**
+	 * Creates a DCN name_UMLS mapping
+	 * @param mapfile a name_UMLS mapping file
+	 * @throws IOException
+	 */
+	public static void createDCNIdNameMap(String mapfile) throws IOException {
+		
+		BufferedReader br = new BufferedReader(new FileReader(mapfile));
+		String line = null;
+		while((line = br.readLine()) != null){
+			String[] parts = line.split("\\|");
+			String name = parts[0].toLowerCase();
+			String id = parts[1];
+			if (!dcnnameidmap.containsKey(name)) {
+				dcnnameidmap.put(name, id);
+			}
+			
+			if (!dcnidnamemap.containsKey(id)) {
+				List<String> names = new ArrayList<>();
+				names.add(name);
+				dcnidnamemap.put(id, names);
+			} else {
+				dcnidnamemap.get(id).add(name);
+			}
+		}
+		br.close();
+	} 
+	
+
+	/**
+	 * Creates a OMIM name_UMLS mapping
+	 * @param mapfile a name_UMLS mapping file
+	 * @throws IOException
+	 */
+	public static void createOMIMIdNameMap(String mapfile) throws IOException {
+		
+		BufferedReader br = new BufferedReader(new FileReader(mapfile));
+		String line = null;
+		while((line = br.readLine()) != null){
+			String[] parts = line.split("\\|");
+			String name = parts[0].toLowerCase();
+			String id = parts[1];
+			if (!omimnameidmap.containsKey(name)) {
+				omimnameidmap.put(name, id);
+			}
+			
+			if (!omimidnamemap.containsKey(id)) {
+				List<String> names = new ArrayList<>();
+				names.add(name);
+				omimidnamemap.put(id, names);
+			} else {
+				omimidnamemap.get(id).add(name);
+			}
+		}
+		br.close();
+	} 
+	
+	/**
+	 * Get DCN_OMIM mapping
+	 * @return DCN_OMIM mapping
+	 */
+	public Map<String, List<String>> getDCNOMIMUMLSIDmap() {
+		return DCN_OMIM;
+	}
+	
+	public static void main(String[] args) throws IOException {
+
+		String dcnmapfile = "/Users/zhengc/workspace/FARES_final/data/FARES/map/term_umls_id_diso";
+		String omimmapfile = "/Users/zhengc/workspace/FARES_final/data/OMIM/map/OMIM_umls_id_diso";
+		createDCNIdNameMap(dcnmapfile);
+		createOMIMIdNameMap(omimmapfile);
+		
+		String DCN_dis = "dementia";
+		String OMIM_pat = "alzheimer";
+		
+		DCNOMIMUMLSIDmap domim = new DCNOMIMUMLSIDmap(DCN_dis, OMIM_pat);
+		Map<String, List<String>> dcn_omim = domim.getDCNOMIMUMLSIDmap();
+				
+		System.out.println(DCN_dis + ": " + dcnnameidmap.get(DCN_dis));
+		
+		String DCN_dis_id = dcnnameidmap.get(DCN_dis);
+		List<String> OMIM_ids = dcn_omim.get(DCN_dis_id);
+		
+		for (String id : OMIM_ids) {
+			List<String> names = omimidnamemap.get(id);
+			for (String name : names) {
+				System.out.println(name + ": " + id);
+			}
+		}
+
+	}
+
+}