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// Portions Copyright [2019] Payara Foundation and/or affiliates

/*
 * EJBQLException.java
 *
 * Created on November 12, 2001
 */

package com.sun.jdo.spi.persistence.support.ejb.ejbqlc;

/**
 * This class represents errors reported by the EJBQL compiler.
 *
 * @author  Michael Bouschen
 */
public class EJBQLException
    extends RuntimeException
{
    /** The Throwable that caused this EJBQLException. */
    Throwable cause;

    /**
     * Creates a new EJBQLException without detail message.
     */
    public EJBQLException()
    {
    }

    /**
     * Constructs a new EJBQLException with the specified
     * detail message.
     * @param msg the detail message.
     */
    public EJBQLException(String msg)
    {
        super(msg);
    }

    /**
      * Constructs a new EJBQLException with the specified
      * detail message and cause.
      * @param msg the detail message.
      * @param cause the cause Throwable.
      */
    public EJBQLException(String msg, Throwable cause)
    {
        super(msg);
        this.cause = cause;
    }

    /**
     * Returns the cause of this EJBQLException or
     * null if the cause is nonexistent or unknown.
     * @return the cause of this or null if the
     * cause is nonexistent or unknown.
     */
    public Throwable getCause()
    {
        return cause;
    }

    /**
     * The String representation includes the name of the class,
     * the descriptive comment (if any),
     * and the String representation of the cause
     * Throwable (if any).
     * @return the String.
     */
    public String toString() {
        // calculate approximate size of the String to return
        StringBuilder sb = new StringBuilder();
        sb.append (super.toString());
        // include cause Throwable information
        if (cause != null) {
            sb.append("\n");  //NOI18N
            sb.append("Nested exception"); //NOI18N
            sb.append("\n");  //NOI18N
            sb.append(cause.toString());
        }
        return sb.toString();
    }
}