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/*
 *  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
 *
 *      http://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.commons.collections;

import java.io.PrintStream;
import java.io.PrintWriter;

/**
 *  Runtime exception thrown from functors.
 *  If required, a root cause error can be wrapped within this one.
 *
 *  @since Commons Collections 3.0
 *  @version $Revision$ $Date$
 *
 *  @author Stephen Colebourne
 *
 * @deprecated Apache Commons Collections version 3.x is being deprecated from AEMaaCS. The upgraded version 4.4 of Commons Collections is already included as replacement. Customers are advised to upgrade to this version of the library. Please note: the package name was changed to org.apache.commons.collections4. Further note that there are AEM APIs currently exposing the old collections classes; these will be updated in upcoming releases.
 */
@Deprecated(since = "2021-04-30")
public class FunctorException extends RuntimeException {

    /**
     * Does JDK support nested exceptions
     */
    private static final boolean JDK_SUPPORTS_NESTED;

    static {
        boolean flag = false;
        try {
            Throwable.class.getDeclaredMethod("getCause", new Class[0]);
            flag = true;
        } catch (NoSuchMethodException ex) {
            flag = false;
        }
        JDK_SUPPORTS_NESTED = flag;
    }

    /**
     * Root cause of the exception
     */
    private final Throwable rootCause;

    /**
     * Constructs a new FunctorException without specified
     * detail message.
     */
    public FunctorException() {
        super();
        this.rootCause = null;
    }

    /**
     * Constructs a new FunctorException with specified
     * detail message.
     *
     * @param msg  the error message.
     */
    public FunctorException(String msg) {
        super(msg);
        this.rootCause = null;
    }

    /**
     * Constructs a new FunctorException with specified
     * nested Throwable root cause.
     *
     * @param rootCause  the exception or error that caused this exception
     *                   to be thrown.
     */
    public FunctorException(Throwable rootCause) {
        super((rootCause == null ? null : rootCause.getMessage()));
        this.rootCause = rootCause;
    }

    /**
     * Constructs a new FunctorException with specified
     * detail message and nested Throwable root cause.
     *
     * @param msg        the error message.
     * @param rootCause  the exception or error that caused this exception
     *                   to be thrown.
     */
    public FunctorException(String msg, Throwable rootCause) {
        super(msg);
        this.rootCause = rootCause;
    }

    /**
     * Gets the cause of this throwable.
     *
     * @return  the cause of this throwable, or null
     */
    public Throwable getCause() {
        return rootCause;
    }

    /**
     * Prints the stack trace of this exception to the standard error stream.
     */
    public void printStackTrace() {
        printStackTrace(System.err);
    }

    /**
     * Prints the stack trace of this exception to the specified stream.
     *
     * @param out  the PrintStream to use for output
     */
    public void printStackTrace(PrintStream out) {
        synchronized (out) {
            PrintWriter pw = new PrintWriter(out, false);
            printStackTrace(pw);
            // Flush the PrintWriter before it's GC'ed.
            pw.flush();
        }
    }

    /**
     * Prints the stack trace of this exception to the specified writer.
     *
     * @param out  the PrintWriter to use for output
     */
    public void printStackTrace(PrintWriter out) {
        synchronized (out) {
            super.printStackTrace(out);
            if (rootCause != null && JDK_SUPPORTS_NESTED == false) {
                out.print("Caused by: ");
                rootCause.printStackTrace(out);
            }
        }
    }
}