This commit ensures that the varargs component type for a MethodHandle
cannot be null in ReflectionHelper's
convertAllMethodHandleArguments(...) method in SpEL.
Closes gh-33193
Prior to this commit, the Spring Expression Language (SpEL) could not
invoke a varargs MethodHandle function with an array containing the
variable arguments, although that is supported for a varargs Method
function. Attempting to do so resulted in the array being supplied as a
single argument to the MethodHandle.
This commit addresses this by updating the
executeFunctionViaMethodHandle(...) method in FunctionReference as
follows when the user supplies the varargs already packaged in an array.
- Creates a new array large enough to hold the non-varargs arguments
and the unpackaged varargs arguments.
- Adds the non-varargs arguments to the beginning of that array and
adds the unpackaged varargs arguments to the end of that array.
- Invokes the MethodHandle with the new arguments array.
Closes gh-33191
Prior to this commit, the Spring Expression Language (SpEL) could not
invoke a varargs MethodHandle function with zero variable arguments,
even though the variable arguments are not required. Attempting to do
so resulted in a SpelEvaluationException with an
INCORRECT_NUMBER_OF_ARGUMENTS_TO_FUNCTION message.
This commit addresses this by updating the
executeFunctionViaMethodHandle(...) method in FunctionReference so that
it properly checks the required number of arguments for both varargs
and non-varargs MethodHandle invocations.
This commit also improves the error message for varargs invocations
with too few arguments. For example, if the MethodHandle requires at
least 1 argument plus a variable number of additional arguments and 0
arguments were supplied, the error message now states:
"Incorrect number of arguments for function 'myFunc': 0 supplied but function takes 1 or more"
Instead of:
"Incorrect number of arguments for function 'myFunc': 0 supplied but function takes 2"
Closes gh-33190
Prior to this commit, the Spring Expression Language (SpEL) incorrectly
split single String arguments by comma for Object... varargs method and
constructor invocations.
This commit addresses this by checking if the single argument type is
already "assignable" to the varargs component type instead of "equal"
to the varargs component type.
Closes gh-33013
FunctionReference in the Spring Expression Language (SpEL) currently
does not unwrap an InvocationTargetException; however,
ConstructorReference and MethodReference do.
For example, currently one may encounter an exception like the
following, where the 'null' comes from the fact that an
InvocationTargetException doesn't always have a message.
SpelEvaluationException: EL1023E: A problem occurred whilst attempting
to invoke the function 'formatObjectVarargs': 'null'
To address that, and to align with the behavior of ConstructorReference
and MethodReference, this commit modifies FunctionReference so that it
unwraps the InvocationTargetException to use its cause for the
exception message, resulting in an exception message like the following.
SpelEvaluationException: EL1023E: A problem occurred whilst attempting
to invoke the function 'formatObjectVarargs': 'Format specifier '%s''
Closes gh-33174
Prior to this commit, the Spring Expression Language (SpEL) failed to
compile an expression that indexed into a Map using a primitive literal
(boolean, int, long, float, or double).
This commit adds support for compilation of such expressions by
ensuring that primitive literals are boxed into their corresponding
wrapper types in the compiled bytecode.
Closes gh-32903
Prior to this commit, the Spring Expression Language (SpEL) failed to
compile an expression that indexed into any array or list using an
Integer.
This commit adds support for compilation of such expressions by
ensuring that an Integer is unboxed into an int in the compiled
bytecode.
See gh-32694
Closes gh-32908
This commit first reverts changes to SpelNodeImpl from the previous
commit in order to reduce the scope of the overall change set.
This commit then implements a different approach to support type-safe
checks for array subtype compatibility.
In order to support backward compatibility, this commit also
reintroduces generateCodeForArguments(MethodVisitor, CodeFlow, Member,
SpelNodeImpl[]) in deprecated form.
See gh-32804
This commit introduces support for compiling SpEL expressions that
contain varargs invocations where the supplied array is a subtype of
the declared varargs array type.
See gh-32804
Prior to this commit, an IndexAccessor could not provide support for a
Collection target type, since the built-in support for indexing into a
Collection in SpEL's Indexer took precedence.
This commit allows an IndexAccessor to support custom Collection target
types by separating the built-in List and Collection support and
applying the built-in Collection support after custom index accessors
have been applied.
Closes gh-32736
This commit introduces ReflectiveIndexAccessor for the Spring
Expression Language (SpEL) which is somewhat analogous to the
ReflectivePropertyAccessor implementation of PropertyAccessor.
ReflectiveIndexAccessor is a flexible IndexAccessor implementation that
uses reflection to read from and optionally write to an indexed
structure of a target object. ReflectiveIndexAccessor also implements
CompilableIndexAccessor in order to support compilation to bytecode for
read access.
For example, the following creates a read-write IndexAccessor for a
FruitMap type that is indexed by Color, including built-in support for
compilation to bytecode for read access.
IndexAccessor indexAccessor = new ReflectiveIndexAccessor(
FruitMap.class, Color.class, "getFruit", "setFruit");
Closes gh-32714
This commit introduces a new CompilableIndexAccessor SPI for the Spring
Expression Language (SpEL) which allows an IndexAccessor to support
compilation to bytecode for operations that read an index.
This analogous to the CompilablePropertyAccessor SPI.
This commit also includes a prototype for a general purpose
ReflectiveIndexAccessor in the tests.
Closes gh-32613
In order to make SpelNode compilation aware, this method moves the
declaration of isCompilable() and generateCode(...) from SpelNodeImpl
to SpelNode.
Closes gh-32707
Prior to this commit, the Spring Expression Language (SpEL) failed to
compile an expression that indexed into any array or list using an
Integer.
This commit adds support for compilation of such expressions by
ensuring that an Integer is unboxed into an int in the compiled
bytecode.
Closes gh-32694
Sam Brannen
Mikaël Francoeur