/*
 *  Copyright 2008 biaoping.yin
 *
 *  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 org.frameworkset.util.beans;



/**
 * <p>Title: NestedRuntimeException.java</p> 
 * <p>Description: </p>
 * <p>bboss workgroup</p>
 * <p>Copyright (c) 2007</p>
 * @Date 2010-10-2 上午10:09:33
 * @author biaoping.yin
 * @version 1.0
 */
public class NestedRuntimeException  extends RuntimeException {

	/** Use serialVersionUID from Bboss 1.2 for interoperability */
	private static final long serialVersionUID = 5439915454935047936L;
	

	/**
	 * Construct a <code>NestedRuntimeException</code> with the specified detail message.
	 * @param msg the detail message
	 */
	public NestedRuntimeException(String msg) {
		super(msg);
	}

	/**
	 * Construct a <code>NestedRuntimeException</code> with the specified detail message
	 * and nested exception.
	 * @param msg the detail message
	 * @param cause the nested exception
	 */
	public NestedRuntimeException(String msg, Throwable cause) {
		super(msg, cause);
	}


	/**
	 * Return the detail message, including the message from the nested exception
	 * if there is one.
	 */
	public String getMessage() {
		return NestedExceptionUtils.buildMessage(super.getMessage(), getCause());
	}


	/**
	 * Retrieve the innermost cause of this exception, if any.
	 * @return the innermost exception, or <code>null</code> if none
	 * @since 2.0
	 */
	public Throwable getRootCause() {
		Throwable rootCause = null;
		Throwable cause = getCause();
		while (cause != null && cause != rootCause) {
			rootCause = cause;
			cause = cause.getCause();
		}
		return rootCause;
	}

	/**
	 * Retrieve the most specific cause of this exception, that is,
	 * either the innermost cause (root cause) or this exception itself.
	 * <p>Differs from {@link #getRootCause()} in that it falls back
	 * to the present exception if there is no root cause.
	 * @return the most specific cause (never <code>null</code>)
	 * @since 2.0.3
	 */
	public Throwable getMostSpecificCause() {
		Throwable rootCause = getRootCause();
		return (rootCause != null ? rootCause : this);
	}

	/**
	 * Check whether this exception contains an exception of the given type:
	 * either it is of the given class itself or it contains a nested cause
	 * of the given type.
	 * @param exType the exception type to look for
	 * @return whether there is a nested exception of the specified type
	 */
	public boolean contains(Class exType) {
		if (exType == null) {
			return false;
		}
		if (exType.isInstance(this)) {
			return true;
		}
		Throwable cause = getCause();
		if (cause == this) {
			return false;
		}
		if (cause instanceof NestedRuntimeException) {
			return ((NestedRuntimeException) cause).contains(exType);
		}
		else {
			while (cause != null) {
				if (exType.isInstance(cause)) {
					return true;
				}
				if (cause.getCause() == cause) {
					break;
				}
				cause = cause.getCause();
			}
			return false;
		}
	}

}
