Class ArityException

java.lang.Object

java.lang.Throwable

java.lang.Exception

com.oracle.truffle.api.interop.InteropException

com.oracle.truffle.api.interop.ArityException

All Implemented Interfaces:

Serializable

public final class ArityException
extends InteropException

An exception thrown if a executable or instantiable object was provided with the wrong number of arguments.

Since:

0.11

See Also:

• Serialized Form

Method Summary

Modifier and Type	Method	Description
static ArityException	create(int expectedMinArity, int expectedMaxArity, int actualArity)	Creates an ArityException to indicate that the wrong number of arguments were provided.
static ArityException	create(int expectedMinArity, int expectedMaxArity, int actualArity, Throwable cause)	Creates an ArityException to indicate that the wrong number of arguments were provided.
int	getActualArity()	Returns the actual number of arguments provided by the foreign access.
int	getExpectedMaxArity()	Returns the maximum number of arguments that are expected.
int	getExpectedMinArity()	Returns the minimum number of arguments that are expected.
String	getMessage()

Methods inherited from class com.oracle.truffle.api.interop.InteropException

fillInStackTrace, getCause, initCause

Methods inherited from class java.lang.Throwable

addSuppressed, getLocalizedMessage, getStackTrace, getSuppressed, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Details

getMessage

public String getMessage()

Overrides:

getMessage in class Throwable

Since:

19.0

getExpectedMinArity

public int getExpectedMinArity()

Returns the minimum number of arguments that are expected. The returned minimum arity might be less conservative than the actual specification of the executable or instantiable invoked.

Since:

21.0

getExpectedMaxArity

public int getExpectedMaxArity()

Returns the maximum number of arguments that are expected. Returns a negative number if infinite arguments can be provided.

Since:

21.0

getActualArity

public int getActualArity()

Returns the actual number of arguments provided by the foreign access. If a negative value is returned then the actual arity is unknown.

Returns:

the number of provided arguments

Since:

0.11

create

public static ArityException create(int expectedMinArity,
 int expectedMaxArity,
 int actualArity)

Creates an ArityException to indicate that the wrong number of arguments were provided. Throws an IllegalArgumentException if the arguments are invalid and assertions (-ea) are enabled.

This method is designed to be used in compiled code paths.

Parameters:

expectedMinArity - (inclusive) the minimum number of arguments expected by the executable. Must be greater or equal to zero.

expectedMaxArity - (inclusive) the maximum number of arguments expected by the executable. If the maximum is negative then an infinite number of arguments is expected. If the number is positive then the maximum must be greater or equal to expectedMinArity.

actualArity - the number of provided by the executable. The actual arity must not be within range of the expected min and max arity.

Since:

21.2

create

public static ArityException create(int expectedMinArity,
 int expectedMaxArity,
 int actualArity,
 Throwable cause)

Creates an ArityException to indicate that the wrong number of arguments were provided. Throws an IllegalArgumentException if the arguments are invalid and assertions (-ea) are enabled.

In addition a cause may be provided. The cause should only be set if the guest language code caused this problem. An example for this is a language specific proxy mechanism that invokes guest language code to describe an object. If the guest language code fails to execute and this interop exception is a valid interpretation of the error, then the error should be provided as cause. The cause can then be used by the source language as new exception cause if the InteropException is translated to a source language error. If the InteropException is discarded, then the cause will most likely get discarded by the source language as well. Note that the cause must be of type AbstractTruffleException otherwise an IllegalArgumentException is thrown.

This method is designed to be used in compiled code paths.

Parameters:

expectedMinArity - (inclusive) the minimum number of arguments expected by the executable. Must be greater or equal to zero.

expectedMaxArity - (inclusive) the maximum number of arguments expected by the executable. If the maximum is negative then an infinite number of arguments is expected. If the number is positive then the maximum must be greater or equal to expectedMinArity.

actualArity - the number of provided by the executable. The actual arity must not be within range of the expected min and max arity.

cause - the guest language exception that caused the error.

Since:

21.2