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package org.glassfish.jersey.internal.util;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * The Exception Utils class provide utility method for exception handling.
 *
 * @author Stepan Vavra (stepan.vavra@oracle.com)
 */
public final class ExceptionUtils {

    private ExceptionUtils() {
    }

    /**
     * Gets the stack trace of the provided throwable as a string.
     *
     * @param t the exception to get the stack trace for.
     * @return the stack trace as a string.
     */
    public static String exceptionStackTraceAsString(Throwable t) {
        StringWriter sw = new StringWriter();
        t.printStackTrace(new PrintWriter(sw));
        return sw.toString();
    }

    /**
     * Based on the rethrow parameter, either rethrows the supplied exception or logs the provided message at the given level.
     *
     * @param e       the exception to rethrow if rethrow is {@code true}.
     * @param rethrow whether to rethrow an exception or just log the provided message.
     * @param logger  the logger to print the message with.
     * @param m       the message to log if rethrow is {@code false}.
     * @param level   the level of the logged message.
     * @param <T>     the type of the exception to be conditionally rethrown.
     * @throws T if rethrow is {@code true}.
     */
    public static <T extends Exception> void conditionallyReThrow(T e, boolean rethrow, Logger logger, String m, Level level)
            throws T {
        if (rethrow) {
            throw e;
        } else {
            // do not mask the other exception, just log this one
            logger.log(level, m, e);
        }
    }
}
