Add support for layer read-only initialization and enforce write checks in EditableLayer methods (#443)

This commit introduces a `readOnly` flag throughout the layering and indexing APIs, updates all callers to propagate it, and enforces write protection on layers and indexes.  
- Added `readOnly` parameter to `LayerIndexReader.init`, `RTreeIndex.init`, `Layer.initialize`, and related factory methods.  
- Enforced write checks via `checkWritable()` in `EditableLayerImpl`, `RTreeIndex`, `DynamicLayer`, and others.  
- Updated all calls to `getLayer`/`getOrCreateLayer` in main code and tests to supply the appropriate `readOnly` boolean.

Author: Andy2003

server-plugin/src/main/java/org/geotools/data/neo4j/Neo4jSpatialDataStore.java

@@ -61,14 +61,14 @@
  */
 public class Neo4jSpatialDataStore extends ContentDataStore implements Constants {
 
-	private List<Name> typeNames;
 	private final Map<String, SimpleFeatureType> simpleFeatureTypeIndex = Collections.synchronizedMap(new HashMap<>());
 	private final Map<String, CoordinateReferenceSystem> crsIndex = Collections.synchronizedMap(new HashMap<>());
 	private final Map<String, Style> styleIndex = Collections.synchronizedMap(new HashMap<>());
 	private final Map<String, ReferencedEnvelope> boundsIndex = Collections.synchronizedMap(new HashMap<>());
 	private final Map<String, SimpleFeatureSource> featureSourceIndex = Collections.synchronizedMap(new HashMap<>());
 	private final GraphDatabaseService database;
 	private final SpatialDatabaseService spatialDatabase;
+	private List<Name> typeNames;
 
 	public Neo4jSpatialDataStore(GraphDatabaseService database) {
 		this.database = database;
@@ -91,7 +91,7 @@ protected List<Name> createTypeNames() {
 				for (String allTypeName : allTypeNames) {
 					// discard empty layers
 					System.out.print("loading layer " + allTypeName);
-					Layer layer = spatialDatabase.getLayer(tx, allTypeName);
+					Layer layer = spatialDatabase.getLayer(tx, allTypeName, true);
 					if (!layer.getIndex().isEmpty(tx)) {
 						notEmptyTypes.add(new NameImpl(allTypeName));
 					}
@@ -111,7 +111,7 @@ public SimpleFeatureType buildFeatureType(String typeName) throws IOException {
 		SimpleFeatureType result = simpleFeatureTypeIndex.get(typeName);
 		if (result == null) {
 			try (Transaction tx = database.beginTx()) {
-				Layer layer = spatialDatabase.getLayer(tx, typeName);
+				Layer layer = spatialDatabase.getLayer(tx, typeName, true);
 				if (layer == null) {
 					throw new IOException("Layer not found: " + typeName);
 				}
@@ -129,7 +129,7 @@ public ReferencedEnvelope getBounds(String typeName) {
 		ReferencedEnvelope result = boundsIndex.get(typeName);
 		if (result == null) {
 			try (Transaction tx = database.beginTx()) {
-				Layer layer = spatialDatabase.getLayer(tx, typeName);
+				Layer layer = spatialDatabase.getLayer(tx, typeName, true);
 				if (layer != null) {
 					Envelope bbox = Utilities.fromNeo4jToJts(layer.getIndex().getBoundingBox(tx));
 					result = new ReferencedEnvelope(bbox, getCRS(tx, layer));
@@ -164,7 +164,7 @@ protected ContentFeatureSource createFeatureSource(ContentEntry contentEntry) th
 		ArrayList<SpatialDatabaseRecord> records = new ArrayList<>();
 		String[] extraPropertyNames;
 		try (Transaction tx = database.beginTx()) {
-			layer = spatialDatabase.getLayer(tx, contentEntry.getTypeName());
+			layer = spatialDatabase.getLayer(tx, contentEntry.getTypeName(), false);
 			SearchRecords results = layer.getIndex().search(tx, new SearchAll());
 			// We need to pull all records during this transaction, so that later readers do not have a transaction violation
 			// TODO: See if there is a more memory efficient way of doing this, perhaps create a transaction at read time in the reader?
@@ -194,7 +194,7 @@ private CoordinateReferenceSystem getCRS(Transaction tx, Layer layer) {
 
 	private Object getLayerStyle(String typeName) {
 		try (Transaction tx = database.beginTx()) {
-			Layer layer = spatialDatabase.getLayer(tx, typeName);
+			Layer layer = spatialDatabase.getLayer(tx, typeName, true);
 			tx.commit();
 			if (layer == null) {
 				return null;