--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Samples/FHIR/src/main/java/Toolbox.java	Sat Oct 21 09:53:25 2023 +0200
@@ -0,0 +1,112 @@
+/**
+ * SPDX-FileCopyrightText: 2023 Sebastien Jodogne, UCLouvain, Belgium
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+/**
+ * Java plugin for Orthanc
+ * Copyright (C) 2023 Sebastien Jodogne, UCLouvain, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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/>.
+ **/
+
+
+import org.hl7.fhir.r5.model.CodeableConcept;
+import org.hl7.fhir.r5.model.Reference;
+
+import java.time.LocalDate;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class Toolbox {
+    public static String TAG_PATIENT_NAME = "0010,0010";
+    public static String TAG_PATIENT_ID = "0010,0020";
+    public static String TAG_PATIENT_BIRTH_DATE = "0010,0030";
+    public static String TAG_PATIENT_SEX = "0010,0040";
+    public static String TAG_STUDY_INSTANCE_UID = "0020,000d";
+    public static String TAG_STUDY_DATE = "0008,0020";
+    public static String TAG_SERIES_DESCRIPTION = "0008,103e";
+    public static String TAG_SERIES_INSTANCE_UID = "0020,000e";
+    public static String TAG_MODALITY = "0008,0060";
+    public static String TAG_SERIES_NUMBER = "0020,0011";
+    public static String TAG_SOP_INSTANCE_UID = "0008,0018";
+    public static String TAG_INSTANCE_NUMBER = "0020,0013";
+
+    public static Date parseDicomDate(String date) {
+        Pattern pattern = Pattern.compile("^([0-9]{4})([0-9]{2})([0-9]{2})$");
+        Matcher matcher = pattern.matcher(date);
+        if (matcher.matches()) {
+            GregorianCalendar calendar = new GregorianCalendar(
+                    Integer.parseInt(matcher.group(1)),
+                    Integer.parseInt(matcher.group(2)) - 1,  // Month is 1-based in DICOM
+                    Integer.parseInt(matcher.group(3)));
+            return calendar.getTime();
+        } else {
+            throw new IllegalArgumentException("Badly formatted DICOM date: " + date);
+        }
+    }
+
+    public static Date parseFhirDate(String date) {
+        Pattern pattern = Pattern.compile("^([0-9]{4})-([0-9]{2})-([0-9]{2})$");
+        Matcher matcher = pattern.matcher(date);
+        if (matcher.matches()) {
+            Calendar c = Calendar.getInstance();
+            c.set(Integer.parseInt(matcher.group(1)),
+                    Integer.parseInt(matcher.group(2)) - 1,  // Month is 1-based in FHIR
+                    Integer.parseInt(matcher.group(3)));
+            return c.getTime();
+        } else {
+            throw new IllegalArgumentException("Badly formatted FHIR date: " + date);
+        }
+    }
+
+    public static String formatDicomDate(Date date) {
+        Calendar calendar = new GregorianCalendar();
+        calendar.setTime(date);
+        return String.format("%04d%02d%02d", calendar.get(Calendar.YEAR),
+                calendar.get(Calendar.MONTH) + 1,  // Month is 1-based in DICOM
+                calendar.get(Calendar.DAY_OF_MONTH));
+    }
+
+    public static String formatFhirDate(Date date) {
+        Calendar calendar = new GregorianCalendar();
+        calendar.setTime(date);
+        return String.format("%04d-%02d-%02d", calendar.get(Calendar.YEAR),
+                calendar.get(Calendar.MONTH) + 1,  // Month is 1-based in FHIR
+                calendar.get(Calendar.DAY_OF_MONTH));
+    }
+
+    public static CodeableConcept createCodeableConcept(String system,
+                                                        String code) {
+        CodeableConcept codeable = new CodeableConcept();
+        codeable.addCoding();
+        codeable.getCoding().get(0).setSystem(system);
+        codeable.getCoding().get(0).setCode(code);
+        return codeable;
+    }
+
+    public static CodeableConcept createDicomCodeableConcept(String code) {
+        return createCodeableConcept("http://dicom.nema.org/resources/ontology/DCM", code);
+    }
+
+    public static Reference createLocalReference(String type,
+                                                 String id) {
+        Reference reference = new Reference();
+        reference.setReference(type + "/" + id);
+        return reference;
+    }
+}