/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999-2005 Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist;

import javassist.compiler.CompileError;

/**
 * Thrown when bytecode transformation has failed.
 */
public class CannotCompileException extends Exception {
    private String message;
    private Throwable cause;

    public String getReason() {
        if (message != null)
            return message;
        else
            return this.toString();
    }

    /**
     * Constructs a CannotCompileException with a message.
     *
     * @param msg       the message.
     */
    public CannotCompileException(String msg) {
        super(msg);
        message = msg;
        cause = null;
    }

    /**
     * Constructs a CannotCompileException with an <code>Exception</code>
     * representing the cause.
     *
     * @param e     the cause.
     */
    public CannotCompileException(Throwable e) {
        super("by " + e.toString());
        message = null;
        cause = e;
    }

    /**
     * Constructs a CannotCompileException with a detailed message
     * and an <code>Exception</code> representing the cause.
     *
     * @param msg   the message.
     * @param e     the cause.
     */
    public CannotCompileException(String msg, Throwable e) {
        this(msg);
        cause = e;
    }

    /**
     * Constructs a CannotCompileException with a
     * <code>NotFoundException</code>.
     */
    public CannotCompileException(NotFoundException e) {
        this("cannot find " + e.getMessage(), e);
    }

    /**
     * Constructs a CannotCompileException with an <code>CompileError</code>.
     */
    public CannotCompileException(CompileError e) {
        this("[source error] " + e.getMessage(), e);
    }

    /**
     * Constructs a CannotCompileException
     * with a <code>ClassNotFoundException</code>.
     */
    public CannotCompileException(ClassNotFoundException e, String name) {
        this("cannot find " + name, e);
    }

    /**
     * Constructs a CannotCompileException with a ClassFormatError.
     */
    public CannotCompileException(ClassFormatError e, String name) {
        this("invalid class format: " + name, e);
    }

    /**
     * Prints this exception and its backtrace.
     */
    public void printStackTrace(java.io.PrintWriter w) {
        super.printStackTrace(w);
        if (cause != null) {
            w.println("Caused by:");
            cause.printStackTrace(w);
        }
    }

    /**
     * Prints this exception and its backtrace.
     */
    public void printStackTrace(java.io.PrintStream w) {
        super.printStackTrace(w);
        if (cause != null) {
            w.println("Caused by:");
            cause.printStackTrace(w);
        }
    }
}