From ec50eca15bbfcbec4bc2a3ed213bc599ffa3512a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kilian=20Sch=C3=BCttler?= <kilian.schuettler@knecon.com>
Date: Wed, 11 Sep 2024 13:38:35 +0200
Subject: [PATCH] RED-9975: extend SectionIdentifier to alphanumeric

---
 .../document/nodes/SectionIdentifier.java     | 66 ++++++++++++++++++-
 1 file changed, 64 insertions(+), 2 deletions(-)

diff --git a/redaction-service-v1/redaction-service-server-v1/src/main/java/com/iqser/red/service/redaction/v1/server/model/document/nodes/SectionIdentifier.java b/redaction-service-v1/redaction-service-server-v1/src/main/java/com/iqser/red/service/redaction/v1/server/model/document/nodes/SectionIdentifier.java
index 0d3cdbaa..16ac4c48 100644
--- a/redaction-service-v1/redaction-service-server-v1/src/main/java/com/iqser/red/service/redaction/v1/server/model/document/nodes/SectionIdentifier.java
+++ b/redaction-service-v1/redaction-service-server-v1/src/main/java/com/iqser/red/service/redaction/v1/server/model/document/nodes/SectionIdentifier.java
@@ -3,11 +3,13 @@ package com.iqser.red.service.redaction.v1.server.model.document.nodes;
 import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Locale;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
+import lombok.Getter;
 import lombok.experimental.FieldDefaults;
 
 /**
@@ -17,15 +19,19 @@ import lombok.experimental.FieldDefaults;
 @FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE)
 public class SectionIdentifier {
 
-    static Pattern numericalIdentifierPattern = Pattern.compile("^[\\s]?(\\d+)[\\s.,;]?(\\d+)?[\\s.,;]?(\\d+)?[\\s.,;]?(\\d+)?");
+    public static Pattern numericalIdentifierPattern = Pattern.compile("^[\\s]?(\\d+)[\\s.,;]?(\\d+)?[\\s.,;]?(\\d+)?[\\s.,;]?(\\d+)?");
+    public static Pattern alphanumericIdentifierPattern = Pattern.compile("^[\\s]?[A-Za-z][\\s.,;]?(\\d+)[\\s.,;]?(\\d+)?[\\s.,;]?(\\d+)?[\\s.,;]?(\\d+)?[\\s.,;]?");
 
-    private enum Format {
+    protected enum Format {
         EMPTY,
         NUMERICAL,
+        ALPHANUMERIC,
         DOCUMENT
     }
 
+    @Getter
     Format format;
+    @Getter
     String identifierString;
     List<Integer> identifiers;
     boolean asChild;
@@ -47,6 +53,10 @@ public class SectionIdentifier {
         if (numericalIdentifierMatcher.find()) {
             return buildNumericalSectionIdentifier(headline, numericalIdentifierMatcher);
         }
+        Matcher alphanumericIdentifierMatcher = alphanumericIdentifierPattern.matcher(headline);
+        if (alphanumericIdentifierMatcher.find()) {
+            return buildAlphanumericSectionIdentifier(headline, alphanumericIdentifierMatcher);
+        }
         // more formats here
         return SectionIdentifier.empty();
     }
@@ -105,6 +115,32 @@ public class SectionIdentifier {
     }
 
 
+    private static SectionIdentifier buildAlphanumericSectionIdentifier(String headline, Matcher alphanumericIdentifierMatcher) {
+
+        String identifierString = headline.substring(alphanumericIdentifierMatcher.start(), alphanumericIdentifierMatcher.end());
+
+        String alphanumericIdentifier = alphanumericIdentifierMatcher.group(0).substring(0, 1).toUpperCase(Locale.ENGLISH);
+        int mappedCharacterValue = alphanumericIdentifier.charAt(0) - 'A' + 1;
+        List<Integer> identifiers = new LinkedList<>();
+        identifiers.add(mappedCharacterValue);
+
+        for (int i = 1; i <= 3; i++) {
+            String numericalIdentifier = alphanumericIdentifierMatcher.group(i);
+            if (numericalIdentifier == null || numericalIdentifier.equals("0") || numericalIdentifier.isEmpty() || numericalIdentifier.isBlank()) {
+                break;
+            }
+            identifiers.add(Integer.parseInt(numericalIdentifier.trim()));
+        }
+
+        return new SectionIdentifier(Format.ALPHANUMERIC,
+                                     // Changed format to reflect alphanumeric
+                                     identifierString,
+                                     identifiers.stream()
+                                             .toList(),
+                                     false);
+    }
+
+
     /**
      * Determines if the current section is the parent of the given section.
      *
@@ -155,4 +191,30 @@ public class SectionIdentifier {
         return identifierString;
     }
 
+
+    /**
+     * @return true, when no identifier could be found
+     */
+    public boolean isEmpty() {
+
+        return this.format.equals(Format.EMPTY);
+    }
+
+
+    /**
+     * The level of a SectionIdentifier corresponds with the count of identifiers. E.g. 1.1 is level 2, and 1. is level 1
+     *
+     * @return the level of the Headline
+     */
+    public int level() {
+
+        return identifiers.size();
+    }
+
+
+    protected List<Integer> getIdentifiers() {
+
+        return identifiers;
+    }
+
 }