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package com.fasterxml.jackson.databind.util;

import java.io.IOException;

/**
 * Utility methods for dealing with exceptions/throwables
 *
 * @since 2.15
 */
public class ExceptionUtil {
    private ExceptionUtil() {}

    /**
     * It is important never to catch all Throwables. Some like
     * {@link InterruptedException} should be rethrown. Based on
     * scala.util.control.NonFatal.
     *
     * This method should be used with care.
     * 
     *     If the Throwable is fatal, it is rethrown, otherwise, this method just returns.
     *     The input throwable is thrown if it is an Error or a RuntimeException.
     *     Otherwise, the method wraps the throwable in a RuntimeException and throws that.
     * 
     *
     * @param throwable to check
     * @throws Error the input throwable if it is fatal
     * @throws RuntimeException the input throwable if it is fatal - throws the original throwable
     * if is a RuntimeException. Otherwise, wraps the throwable in a RuntimeException.
     */
    public static void rethrowIfFatal(Throwable throwable) throws Error, RuntimeException {
        if (isFatal(throwable)) {
            if (throwable instanceof Error) {
                throw (Error) throwable;
            }
            if (throwable instanceof RuntimeException) {
                throw (RuntimeException) throwable;
            }
            throw new RuntimeException(throwable);
        }
    }

    /**
     * It is important never to catch all Throwables. Some like
     * {@link InterruptedException} should be rethrown. Based on
     * scala.util.control.NonFatal.
     *
     * @param throwable to check
     * @return whether the Throwable is a fatal error
     */
    private static boolean isFatal(Throwable throwable) {
        return (throwable instanceof VirtualMachineError
                || throwable instanceof ThreadDeath
                || throwable instanceof InterruptedException
                || throwable instanceof ClassCircularityError
                || throwable instanceof ClassFormatError
                || throwable instanceof IncompatibleClassChangeError
                || throwable instanceof BootstrapMethodError
                || throwable instanceof VerifyError
        );
    }

    public static  T throwSneaky(IOException e) {
        _sneaky(e);
        return null; // never gets here, needed for compiler tho
    }

    @SuppressWarnings("unchecked")
    private static  void _sneaky(Throwable e) throws E {
        throw (E) e;
    }
}