add date extractor

server/src/main/java/org/cd2h/nlpsandbox/DateExtractor.java

@@ -0,0 +1,86 @@
+package org.cd2h.nlpsandbox;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.openapitools.model.DateAnnotation;
+
+public class DateExtractor {
+
+    class NamedPattern{
+        public String name;
+        public Pattern pattern;
+
+        public NamedPattern(String name, Pattern pattern){
+            this.name = name;
+            this.pattern = pattern;
+        }
+    }
+
+    class Span{
+        int begin;
+        int end;
+        int length;
+
+        public Span(int begin, int end){
+            this.begin = begin;
+            this.end = end;
+            this.length = end - begin;
+        }
+    }
+
+    static ArrayList<NamedPattern> datePatterns;
+
+    public DateExtractor(){
+        // refer to https://github.com/Sage-Bionetworks/nlp-sandbox-date-annotator-example/blob/develop/server/openapi_server/controllers/date_controller.py#L32-L47
+        // "MM/DD/YYYY" and  "MM-DD-YYYY"
+        datePatterns = new ArrayList<>();
+        datePatterns.add(new NamedPattern("DD/MM/YYYY",
+                Pattern.compile(
+                        "\\b([1-9]|0[1-9]|1[0-9]|2[0-9]|3[0-1])(/)([1-9]|0[1-9]|1[0-2])(/)(19[0-9][0-9]|20[0-9][0-9])")));
+
+        datePatterns.add(new NamedPattern("MM/DD/YYYY",
+                Pattern.compile(
+                        "\\b([1-9]|0[1-9]|1[0-2])(/)([1-9]|0[1-9]|1[0-9]|2[0-9]|3[0-1])(/)(19[0-9][0-9]|20[0-9][0-9])")));
+
+        datePatterns.add(new NamedPattern("MM-DD-YYYY",
+                Pattern.compile(
+                        "\\b([1-9]|0[1-9]|1[0-2])(-)([1-9]|0[1-9]|1[0-9]|2[0-9]|3[0-1])(-)(19[0-9][0-9]|20[0-9][0-9])")));
+
+
+        datePatterns.add(new NamedPattern("MMMM", Pattern.compile("\\b(January|February|March|April|May|June|" +
+                "July|August|September|October|November|" +
+                "December)")));
+    }
+
+    public List<DateAnnotation> findDatesFromString(String sentence){
+
+        ArrayList<DateAnnotation> annots = new ArrayList<>();
+        for (NamedPattern np: datePatterns) {
+            // Now create matcher object.
+            Matcher m = np.pattern.matcher(sentence);
+            while (m.find()) {
+                System.out.println(String.format("Found matched pattern \"%s\" in value: %s", np.name, m.group(0) ));
+
+                annots.add(new DateAnnotation()
+                        .start(m.start(0))
+                        .length(m.group(0).length())
+                        .noteId(null)
+                        .text(m.group(0))
+                        .format(np.name));
+            }
+        }
+        return annots;
+    }
+
+    public static void main(String[] args) {
+        DateExtractor de = new DateExtractor();
+        String str1 = "Today is 10/26/2020, and yesterday is 10/25/2020. ";
+        de.findDatesFromString(str1);
+
+        String str2 = "Today is 26/11/2020. ";
+        de.findDatesFromString(str2);
+
+    }
+}

server/src/main/java/org/openapitools/api/DatesApi.java

@@ -5,6 +5,7 @@
  */
 package org.openapitools.api;
 
+import org.cd2h.nlpsandbox.DateExtractor;
 import org.openapitools.model.DateAnnotation;
 import org.openapitools.model.Error;
 import java.util.List;
@@ -58,19 +59,16 @@ default Optional<NativeWebRequest> getRequest() {
         consumes = { "application/json" },
         method = RequestMethod.POST)
     default ResponseEntity<List<DateAnnotation>> datesReadAll(@ApiParam(value = ""  )  @Valid @RequestBody(required = false) List<Note> note) {
+        DateExtractor de = new DateExtractor();
+
         List<DateAnnotation> annotations = new ArrayList<DateAnnotation>();
         note.forEach((n) -> {
             // TODO: Extract annotations from the text of the Note object n
             String text = n.getText();
             System.out.print(text);
-
-            annotations.add(new DateAnnotation()
-                .start(123)
-                .length(10)
-                .noteId(12)
-                .text("09-03-1999")
-                .format("MM-DD-YYYY"));
+            annotations.addAll(de.findDatesFromString(text));
         });
+
         return new ResponseEntity<List<DateAnnotation>>(annotations, HttpStatus.OK);
     }