Update fhir terser (#7135)

* add fieldExists

* minor update

* minor update

* deadspace addition

* spotless

* add verbose logging options to maven-spotless-apply hook in pre-commit configuration

* Revert "add verbose logging options to maven-spotless-apply hook in pre-commit configuration"

This reverts commit d8fcf60.

* Revert "spotless"

This reverts commit 9ad1494.

* Revert "deadspace addition"

This reverts commit 5d4b2f5.

* Revert "minor update"

This reverts commit fcda416.

* Revert "minor update"

This reverts commit b8fabde.

---------

Co-authored-by: Vadim Karantayer <[email protected]>
Co-authored-by: Gary <[email protected]>

Author: 3 people

hapi-fhir-base/src/main/java/ca/uhn/fhir/util/FhirTerser.java

@@ -1782,6 +1782,17 @@ public void addElements(IBase theTarget, String thePath, Collection<String> theV
 		}
 	}
 
+	/**
+	 * Checks if the field exists on the resource
+	 *
+	 * @param theFieldName   Name of the field to check
+	 * @param theResource    Resource instance to check
+	 * @return Returns true if resource definition has a child with the specified name and false otherwise
+	 */
+	public boolean fieldExists(String theFieldName, IBaseResource theResource) {
+		return myContext.getResourceDefinition(theResource).getChildByName(theFieldName) != null;
+	}
+
 	/**
 	 * Clones a resource object, copying all data elements from theSource into a new copy of the same type.
 	 * <p>

hapi-fhir-structures-r4/src/test/java/ca/uhn/fhir/util/FhirTerserR4Test.java

@@ -1603,6 +1603,13 @@ void copyingAndParsingCreatesDuplicateContainedResources() {
 		assertEquals(1, parsedCopy.getContained().size());
 	}
 
+	@Test
+	void testFieldExists() {
+		final FhirTerser fhirTerser = myCtx.newTerser();
+		assertThat(fhirTerser.fieldExists("identifier", new Patient())).isTrue();
+		assertThat(fhirTerser.fieldExists("identifier", new Provenance())).isFalse();
+	}
+
 	/**
 	 * See http://stackoverflow.com/questions/182636/how-to-determine-the-class-of-a-generic-type
 	 */