/*
* Copyright 2002-2009 the original author or authors.
*
* 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.springframework.core;
/**
* Handy class for wrapping checked <code>Exceptions</code> with a root cause.
*
* <p>This class is <code>abstract</code> to force the programmer to extend
* the class. <code>getMessage</code> will include nested exception
* information; <code>printStackTrace</code> and other like methods will
* delegate to the wrapped exception, if any.
*
* <p>The similarity between this class and the {@link NestedRuntimeException}
* class is unavoidable, as Java forces these two classes to have different
* superclasses (ah, the inflexibility of concrete inheritance!).
*
* @author Rod Johnson
* @author Juergen Hoeller
* @see #getMessage
* @see #printStackTrace
* @see NestedRuntimeException
*/
public abstract class NestedCheckedException extends Exception {
/** Use serialVersionUID from Spring 1.2 for interoperability */
private static final long serialVersionUID = 7100714597678207546L;
static {
// Eagerly load the NestedExceptionUtils class to avoid classloader deadlock
// issues on OSGi when calling getMessage(). Reported by Don Brown; SPR-5607.
NestedExceptionUtils.class.getName();
}
/**
* Construct a <code>NestedCheckedException</code> with the specified detail message.
* @param msg the detail message
*/
public NestedCheckedException(String msg) {
super(msg);
}
/**
* Construct a <code>NestedCheckedException</code> with the specified detail message
* and nested exception.
* @param msg the detail message
* @param cause the nested exception
*/
public NestedCheckedException(String msg, Throwable cause) {
super(msg, cause);
}
/**
* Return the detail message, including the message from the nested exception
* if there is one.
*/
@Override
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
*/
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 NestedCheckedException) {
return ((NestedCheckedException) cause).contains(exType);
}
else {
while (cause != null) {
if (exType.isInstance(cause)) {
return true;
}
if (cause.getCause() == cause) {
break;
}
cause = cause.getCause();
}
return false;
}
}
}
|