src/main/java/org/apache/bsf/BSFException.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.bsf;

/**
 * If something goes wrong while doing some scripting stuff, one of these is thrown. The integer code indicates what's wrong and the message may give more
 * details. The reason one exception with multiple meanings (via the code) [instead of multiple exception types] is used is due to the interest to keep the
 * run-time size small.
 */
public class BSFException extends Exception {
    public static final int REASON_INVALID_ARGUMENT = 0;
    public static final int REASON_IO_ERROR = 10;
    public static final int REASON_UNKNOWN_LANGUAGE = 20;
    public static final int REASON_EXECUTION_ERROR = 100;
    public static final int REASON_UNSUPPORTED_FEATURE = 499;
    public static final int REASON_OTHER_ERROR = 500;

    int reason;
    Throwable targetThrowable;

    public BSFException(final int reason, final String msg) {
        super(msg);
        this.reason = reason;
    }

    public BSFException(final int reason, final String msg, final Throwable t) {
        this(reason, msg);
        targetThrowable = t;
    }

    public BSFException(final String msg) {
        this(REASON_OTHER_ERROR, msg);
    }

    public int getReason() {
        return reason;
    }

    public Throwable getTargetException() {
        return targetThrowable;
    }

    public void printStackTrace() {
        if (targetThrowable != null) {
            final String msg = getMessage();

            if (msg != null && !msg.equals(targetThrowable.getMessage())) {
                System.err.print(msg + ": ");
            }

            targetThrowable.printStackTrace();
        } else {
            super.printStackTrace();
        }
    }
}