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package com.oracle.truffle.api.interop;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;


An exception thrown if an object does not contain a member with such an identifier. Interop
exceptions are supposed to be caught and converted into a guest language error by the caller.

See Also:
Since:0.11
/**
 * An exception thrown if an object does not contain a member with such an identifier. Interop
 * exceptions are supposed to be caught and converted into a guest language error by the caller.
 *
 * @see #getUnknownIdentifier()
 * @see InteropLibrary
 * @since 0.11
 */
public final class UnknownIdentifierException extends InteropException {

    private static final long serialVersionUID = 1857745390734085182L;

    private final String unknownIdentifier;

    private UnknownIdentifierException(String unknownIdentifier) {
        super(null); // GR-23961 - after language adoption we should initialize the cause with null.
        this.unknownIdentifier = unknownIdentifier;
    }

    private UnknownIdentifierException(String unknownIdentifier, Throwable cause) {
        super(null, cause);
        this.unknownIdentifier = unknownIdentifier;
    }

    
{@inheritDoc}

Since:19.0
/**
     * {@inheritDoc}
     *
     * @since 19.0
     */
    @Override
    @TruffleBoundary
    public String getMessage() {
        return "Unknown identifier: " + unknownIdentifier;
    }

    
Returns the identifier that could not be accessed.

Returns:the unaccessible identifier
Since:0.11
/**
     * Returns the identifier that could not be accessed.
     *
     * @return the unaccessible identifier
     * @since 0.11
     */
    public String getUnknownIdentifier() {
        return unknownIdentifier;
    }

    
Creates an UnknownIdentifierException to indicate that an identifier is missing. 
 This method is designed to be used in compiled code paths. 
Params:
  • unknownIdentifier – the identifier that could not be accessed
Since:19.0
/**
     * Creates an {@link UnknownIdentifierException} to indicate that an identifier is missing.
     * <p>
     * This method is designed to be used in {@link CompilerDirectives#inCompiledCode() compiled}
     * code paths.
     *
     * @param unknownIdentifier the identifier that could not be accessed
     * @since 19.0
     */
    public static UnknownIdentifierException create(String unknownIdentifier) {
        return new UnknownIdentifierException(unknownIdentifier);
    }

    
Creates an UnknownIdentifierException to indicate that an identifier is missing. 
 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 TruffleException in addition to Throwable otherwise an IllegalArgumentException is thrown. 
 This method is designed to be used in compiled code paths. 
Params:
  • unknownIdentifier – the identifier that could not be accessed
  • cause – the guest language exception that caused the error.
Since:20.2
/**
     * Creates an {@link UnknownIdentifierException} to indicate that an identifier is missing.
     * <p>
     * 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.
     * <p>
     * This method is designed to be used in {@link CompilerDirectives#inCompiledCode() compiled}
     * code paths.
     *
     * @param unknownIdentifier the identifier that could not be accessed
     * @param cause the guest language exception that caused the error.
     * @since 20.2
     */
    @SuppressWarnings("deprecation")
    public static UnknownIdentifierException create(String unknownIdentifier, Throwable cause) {
        return new UnknownIdentifierException(unknownIdentifier, cause);
    }

}