org.pkl.thirdparty.truffle.api.interop.StopIterationException Maven / Gradle / Ivy
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package org.pkl.thirdparty.truffle.api.interop;
import org.pkl.thirdparty.truffle.api.CompilerDirectives;
/**
* An exception thrown if an iterator is finished.
*
* This exception is thrown by the {@link InteropLibrary#getIteratorNextElement
* getIteratorNextElement} when the iterator has no more elements to return.
*
* Interop exceptions are supposed to be caught and converted into a guest language error by the
* caller.
*
* @see InteropLibrary
* @since 21.1
*/
public final class StopIterationException extends InteropException {
private static final long serialVersionUID = 1857745390734085182L;
private static final StopIterationException INSTANCE = new StopIterationException();
private StopIterationException() {
super(null);
}
private StopIterationException(Throwable cause) {
super(null, cause);
}
/**
* {@inheritDoc}
*
* @since 21.1
*/
@Override
public String getMessage() {
return "Iteration was stopped.";
}
/**
* Creates an {@link StopIterationException} to indicate that iteration was stopped.
*
* This method is designed to be used in {@link CompilerDirectives#inCompiledCode() compiled}
* code paths.
*
* @since 21.1
*/
public static StopIterationException create() {
return INSTANCE;
}
/**
* Creates an {@link StopIterationException} to indicate that iteration was stopped.
*
* 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 org.pkl.thirdparty.truffle.api.exception.AbstractTruffleException} otherwise an
* {@link IllegalArgumentException} is thrown.
*
* This method is designed to be used in {@link CompilerDirectives#inCompiledCode() compiled}
* code paths.
*
* @param cause the guest language exception that caused the error.
* @since 21.1
*/
public static StopIterationException create(Throwable cause) {
return new StopIterationException(cause);
}
}