Add support for getting the type directly from a Value without using instance of

Author: hmottestad

core/model-api/src/main/java/org/eclipse/rdf4j/model/BNode.java

@@ -27,6 +27,11 @@ default boolean isBNode() {
 		return true;
 	}
 
+	@Override
+	default Type getType() {
+		return Value.Type.BNode;
+	}
+
 	/**
 	 * Retrieves this blank node's identifier.
 	 *

core/model-api/src/main/java/org/eclipse/rdf4j/model/IRI.java

@@ -38,6 +38,11 @@ default boolean isIRI() {
 		return true;
 	}
 
+	@Override
+	default Type getType() {
+		return Value.Type.IRI;
+	}
+
 	/**
 	 * Gets the namespace part of this IRI.
 	 * <p>

core/model-api/src/main/java/org/eclipse/rdf4j/model/Literal.java

@@ -47,6 +47,11 @@ default boolean isLiteral() {
 		return true;
 	}
 
+	@Override
+	default Type getType() {
+		return Value.Type.Literal;
+	}
+
 	/**
 	 * Gets the label (the lexical value) of this literal.
 	 *

core/model-api/src/main/java/org/eclipse/rdf4j/model/Triple.java

@@ -33,6 +33,11 @@ default boolean isTriple() {
 		return true;
 	}
 
+	@Override
+	default Type getType() {
+		return Value.Type.Triple;
+	}
+
 	/**
 	 * Gets the subject of this triple.
 	 *

core/model-api/src/main/java/org/eclipse/rdf4j/model/Value.java

@@ -17,6 +17,13 @@
  */
 public interface Value extends Serializable {
 
+	enum Type {
+		IRI,
+		BNode,
+		Literal,
+		Triple
+	}
+
 	/**
 	 * Check if the object is an instance of the given type. Typically 2x than using instanceof.
 	 * <p>
@@ -72,6 +79,21 @@ default boolean isTriple() {
 		return false;
 	}
 
+	default Type getType() {
+
+		if (isIRI()) {
+			return Type.IRI;
+		} else if (isBNode()) {
+			return Type.BNode;
+		} else if (isLiteral()) {
+			return Type.Literal;
+		} else if (isTriple()) {
+			return Type.Triple;
+		} else {
+			throw new IllegalStateException("Unknown value type");
+		}
+	}
+
 	/**
 	 * Returns the String-value of a <var>Value</var> object. This returns either a {@link Literal}'s label, a
 	 * {@link IRI}'s URI or a {@link BNode}'s ID.

core/sail/nativerdf/src/main/java/org/eclipse/rdf4j/sail/nativerdf/model/CorruptIRIOrBNode.java

@@ -50,6 +50,11 @@ public String stringValue() {
 		return "CorruptIRIOrBNode_with_ID_" + getInternalID();
 	}
 
+	@Override
+	public Type getType() {
+		return IRI.super.getType();
+	}
+
 	@Override
 	public String getNamespace() {
 		return "urn:CorruptIRIOrBNode:";