/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed 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 javax.xml.transform;

/**
 * Thrown when a problem with configuration with the Transformer Factories
 * exists. This error will typically be thrown when the class of a
 * transformation factory specified in the system properties cannot be found
 * or instantiated.
 */
public class TransformerFactoryConfigurationError extends Error {

    private Exception exception;

    /**
     * Create a new <code>TransformerFactoryConfigurationError</code> with no
     * detail mesage.
     */
    public TransformerFactoryConfigurationError() {

        super();

        this.exception = null;
    }

    /**
     * Create a new <code>TransformerFactoryConfigurationError</code> with
     * the <code>String</code> specified as an error message.
     *
     * @param msg The error message for the exception.
     */
    public TransformerFactoryConfigurationError(String msg) {

        super(msg);

        this.exception = null;
    }

    /**
     * Create a new <code>TransformerFactoryConfigurationError</code> with a
     * given <code>Exception</code> base cause of the error.
     *
     * @param e The exception to be encapsulated in a
     * TransformerFactoryConfigurationError.
     */
    public TransformerFactoryConfigurationError(Exception e) {

        super(e.toString());

        this.exception = e;
    }

    /**
     * Create a new <code>TransformerFactoryConfigurationError</code> with the
     * given <code>Exception</code> base cause and detail message.
     *
     * @param e The exception to be encapsulated in a
     * TransformerFactoryConfigurationError
     * @param msg The detail message.
     * @param e The exception to be wrapped in a TransformerFactoryConfigurationError
     */
    public TransformerFactoryConfigurationError(Exception e, String msg) {

        super(msg);

        this.exception = e;
    }

    /**
     * Return the message (if any) for this error . If there is no
     * message for the exception and there is an encapsulated
     * exception then the message of that exception will be returned.
     *
     * @return The error message.
     */
    public String getMessage() {

        String message = super.getMessage();

        if ((message == null) && (exception != null)) {
            return exception.getMessage();
        }

        return message;
    }

    /**
     * Return the actual exception (if any) that caused this exception to
     * be raised.
     *
     * @return The encapsulated exception, or null if there is none.
     */
    public Exception getException() {
        return exception;
    }
}
