DATACMNS-1673 - Use Method.getParameterCount() where possible to improve performance.

Original pull request: #426.

src/main/java/org/springframework/data/repository/query/Parameters.java

@@ -65,15 +65,15 @@ public abstract class Parameters<S extends Parameters<S, T>, T extends Parameter
 
 		Assert.notNull(method, "Method must not be null!");
 
-		List<Class<?>> types = Arrays.asList(method.getParameterTypes());
+		Class<?>[] types = method.getParameterTypes();
 
-		this.parameters = new ArrayList<>(types.size());
+		this.parameters = new ArrayList<>(types.length);
 		this.dynamicProjectionIndex = -1;
 
 		int pageableIndex = -1;
 		int sortIndex = -1;
 
-		for (int i = 0; i < types.size(); i++) {
+		for (int i = 0; i < types.length; i++) {
 
 			MethodParameter methodParameter = new MethodParameter(method, i);
 			methodParameter.initParameterNameDiscovery(discoverer);

src/main/java/org/springframework/data/repository/support/ReflectionRepositoryInvoker.java

@@ -300,12 +300,13 @@ class ReflectionRepositoryInvoker implements RepositoryInvoker {
 
 		Method method = methods.getFindAllMethod()
 				.orElseThrow(() -> new IllegalStateException("Repository doesn't have a find-all-method declared!"));
-		Class<?>[] types = method.getParameterTypes();
 
-		if (types.length == 0) {
+		if (method.getParameterCount() == 0) {
 			return invokeForNonNullResult(method);
 		}
 
+		Class<?>[] types = method.getParameterTypes();
+
 		if (Pageable.class.isAssignableFrom(types[0])) {
 			return invokeForNonNullResult(method, pageable);
 		}

src/main/java/org/springframework/data/spel/spi/Function.java

@@ -166,6 +166,7 @@ public class Function {
 	public boolean isSignatureEqual(Function other) {
 
 		return getName().equals(other.getName()) //
+				&& method.getParameterCount() == other.method.getParameterCount()
 				&& Arrays.equals(method.getParameterTypes(), other.method.getParameterTypes());
 	}
 }