com.oracle.truffle.api.interop.ArityException Maven / Gradle / Ivy
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package com.oracle.truffle.api.interop;
import com.oracle.truffle.api.CompilerDirectives;
/**
* An exception thrown if a executable or instantiable object was provided with the wrong number of
* arguments.
*
* @since 0.11
*/
public final class ArityException extends InteropException {
private static final long serialVersionUID = 1857745390734085182L;
private final int expectedArity;
private final int actualArity;
private ArityException(int expectedArity, int actualArity, Throwable cause) {
super(null, cause);
this.expectedArity = expectedArity;
this.actualArity = actualArity;
}
private ArityException(int expectedArity, int actualArity) {
super(null); // GR-23961 - after language adoption we should initialize the cause with null.
this.expectedArity = expectedArity;
this.actualArity = actualArity;
}
/**
* {@inheritDoc}
*
* @since 19.0
*/
@Override
public String getMessage() {
return "Arity error - expected: " + expectedArity + " actual: " + actualArity;
}
/**
* Returns the number of arguments that the foreign object expects.
*
* @return the number of expected arguments
* @since 0.11
*/
public int getExpectedArity() {
return expectedArity;
}
/**
* Returns the actual number of arguments provided by the foreign access.
*
* @return the number of provided arguments
* @since 0.11
*/
public int getActualArity() {
return actualArity;
}
/**
* Creates an {@link ArityException} to indicate that the wrong number of arguments were
* provided.
*
* This method is designed to be used in {@link CompilerDirectives#inCompiledCode() compiled}
* code paths.
*
* @param expectedArity the number of arguments expected by the foreign object
* @param actualArity the number of provided by the foreign access
* @since 19.0
*/
public static ArityException create(int expectedArity, int actualArity) {
return new ArityException(expectedArity, actualArity);
}
/**
* Creates an {@link ArityException} to indicate that the wrong number of arguments were
* provided.
*
* 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 {@link InteropException} is translated to a source language error. If the
* {@link 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
* {@link com.oracle.truffle.api.TruffleException} in addition to {@link Throwable} otherwise an
* {@link IllegalArgumentException} is thrown.
*
* This method is designed to be used in {@link CompilerDirectives#inCompiledCode() compiled}
* code paths.
*
* @param expectedArity the number of arguments expected by the foreign object
* @param actualArity the number of provided by the foreign access
* @param cause the guest language exception that caused the error.
* @since 20.2
*/
@SuppressWarnings("deprecation")
public static ArityException create(int expectedArity, int actualArity, Throwable cause) {
return new ArityException(expectedArity, actualArity, cause);
}
}