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ExceptionUtils (Hibernate API Documentation) - Hibernate 2.1.8 正式版 API 英文文档

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net.sf.hibernate.exception
Class ExceptionUtils

java.lang.Object
  extended bynet.sf.hibernate.exception.ExceptionUtils
public final class ExceptionUtils
extends Object

Provides utilities for manipulating and examining Throwable objects.

Since:
1.0
Version:
$Id: ExceptionUtils.java,v 1.6 2004/06/04 05:43:45 steveebersole Exp $
Author:
Daniel Rall, Dmitri Plotnikov, Stephen Colebourne, Gary Gregory, Pete Gieser

Method Summary
static Throwable getCause(Throwable throwable)
          Introspects the Throwable to obtain the cause.
static Throwable getCause(Throwable throwable, String[] methodNames)
          Introspects the Throwable to obtain the cause.
static String getFullStackTrace(Throwable throwable)
          A way to get the entire nested stack-trace of an throwable.
static Throwable getRootCause(Throwable throwable)
          Introspects the Throwable to obtain the root cause.
static String[] getRootCauseStackTrace(Throwable throwable)
          Creates a compact stack trace for the root cause of the supplied Throwable.
static String[] getStackFrames(Throwable throwable)
          Captures the stack trace associated with the specified Throwable object, decomposing it into a list of stack frames.
static String getStackTrace(Throwable throwable)
          Gets the stack trace from a Throwable as a String.
static int getThrowableCount(Throwable throwable)
          Counts the number of Throwable objects in the exception chain.
static Throwable[] getThrowables(Throwable throwable)
          Returns the list of Throwable objects in the exception chain.
static int indexOfThrowable(Throwable throwable, Class type)
          Returns the (zero based) index of the first Throwable that matches the specified type in the exception chain.
static int indexOfThrowable(Throwable throwable, Class type, int fromIndex)
          Returns the (zero based) index of the first Throwable that matches the specified type in the exception chain from a specified index.
static boolean isNestedThrowable(Throwable throwable)
          Checks whether this Throwable class can store a cause.
static boolean isThrowableNested()
          Checks if the Throwable class has a getCause method.
static void printRootCauseStackTrace(Throwable throwable)
          Prints a compact stack trace for the root cause of a throwable to System.err.
static void printRootCauseStackTrace(Throwable throwable, PrintStream stream)
          Prints a compact stack trace for the root cause of a throwable.
static void printRootCauseStackTrace(Throwable throwable, PrintWriter writer)
          Prints a compact stack trace for the root cause of a throwable.
static void removeCommonFrames(List causeFrames, List wrapperFrames)
          Removes common frames from the cause trace given the two stack traces.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Method Detail

getCause

public static Throwable getCause(Throwable throwable)

Introspects the Throwable to obtain the cause.

The method searches for methods with specific names that return a Throwable object. This will pick up most wrapping exceptions, including those from JDK 1.4, and NestableException. The method names can be added to using #addCauseMethodName(String).

The default list searched for are:

  • getCause()
  • getNextException()
  • getTargetException()
  • getException()
  • getSourceException()
  • getRootCause()
  • getCausedByException()
  • getNested()

In the absence of any such method, the object is inspected for a detail field assignable to a Throwable.

If none of the above is found, returns null.

Parameters:
throwable - the throwable to introspect for a cause, may be null
Returns:
the cause of the Throwable, null if none found or null throwable input

getCause

public static Throwable getCause(Throwable throwable,
                                 String[] methodNames)

Introspects the Throwable to obtain the cause.

  1. Try known exception types.
  2. Try the supplied array of method names.
  3. Try the field 'detail'.

A null set of method names means use the default set. A null in the set of method names will be ignored.

Parameters:
throwable - the throwable to introspect for a cause, may be null
methodNames - the method names, null treated as default set
Returns:
the cause of the Throwable, null if none found or null throwable input

getRootCause

public static Throwable getRootCause(Throwable throwable)

Introspects the Throwable to obtain the root cause.

This method walks through the exception chain to the last element, "root" of the tree, using getCause(Throwable), and returns that exception.

Parameters:
throwable - the throwable to get the root cause for, may be null
Returns:
the root cause of the Throwable, null if none found or null throwable input

isThrowableNested

public static boolean isThrowableNested()

Checks if the Throwable class has a getCause method.

This is true for JDK 1.4 and above.

Returns:
true if Throwable is nestable
Since:
2.0

isNestedThrowable

public static boolean isNestedThrowable(Throwable throwable)

Checks whether this Throwable class can store a cause.

This method does not check whether it actually does store a cause.

Parameters:
throwable - the Throwable to examine, may be null
Returns:
boolean true if nested otherwise false
Since:
2.0

getThrowableCount

public static int getThrowableCount(Throwable throwable)

Counts the number of Throwable objects in the exception chain.

A throwable without cause will return 1. A throwable with one cause will return 2 and so on. A null throwable will return 0.

Parameters:
throwable - the throwable to inspect, may be null
Returns:
the count of throwables, zero if null input

getThrowables

public static Throwable[] getThrowables(Throwable throwable)

Returns the list of Throwable objects in the exception chain.

A throwable without cause will return an array containing one element - the input throwable. A throwable with one cause will return an array containing two elements. - the input throwable and the cause throwable. A null throwable will return an array size zero.

Parameters:
throwable - the throwable to inspect, may be null
Returns:
the array of throwables, never null

indexOfThrowable

public static int indexOfThrowable(Throwable throwable,
                                   Class type)

Returns the (zero based) index of the first Throwable that matches the specified type in the exception chain.

A null throwable returns -1. A null type returns -1. No match in the chain returns -1.

Parameters:
throwable - the throwable to inspect, may be null
type - the type to search for
Returns:
the index into the throwable chain, -1 if no match or null input

indexOfThrowable

public static int indexOfThrowable(Throwable throwable,
                                   Class type,
                                   int fromIndex)

Returns the (zero based) index of the first Throwable that matches the specified type in the exception chain from a specified index.

A null throwable returns -1. A null type returns -1. No match in the chain returns -1. A negative start index is treated as zero. A start index greater than the number of throwables returns -1.

Parameters:
throwable - the throwable to inspect, may be null
type - the type to search for
fromIndex - the (zero based) index of the starting position, negative treated as zero, larger than chain size returns -1
Returns:
the index into the throwable chain, -1 if no match or null input

printRootCauseStackTrace

public static void printRootCauseStackTrace(Throwable throwable)

Prints a compact stack trace for the root cause of a throwable to System.err.

The compact stack trace starts with the root cause and prints stack frames up to the place where it was caught and wrapped. Then it prints the wrapped exception and continues with stack frames until the wrapper exception is caught and wrapped again, etc.

The method is equivalent to printStackTrace for throwables that don't have nested causes.

Parameters:
throwable - the throwable to output
Since:
2.0

printRootCauseStackTrace

public static void printRootCauseStackTrace(Throwable throwable,
                                            PrintStream stream)

Prints a compact stack trace for the root cause of a throwable.

The compact stack trace starts with the root cause and prints stack frames up to the place where it was caught and wrapped. Then it prints the wrapped exception and continues with stack frames until the wrapper exception is caught and wrapped again, etc.

The method is equivalent to printStackTrace for throwables that don't have nested causes.

Parameters:
throwable - the throwable to output, may be null
stream - the stream to output to, may not be null
Throws:
IllegalArgumentException - if the stream is null
Since:
2.0

printRootCauseStackTrace

public static void printRootCauseStackTrace(Throwable throwable,
                                            PrintWriter writer)

Prints a compact stack trace for the root cause of a throwable.

The compact stack trace starts with the root cause and prints stack frames up to the place where it was caught and wrapped. Then it prints the wrapped exception and continues with stack frames until the wrapper exception is caught and wrapped again, etc.

The method is equivalent to printStackTrace for throwables that don't have nested causes.

Parameters:
throwable - the throwable to output, may be null
writer - the writer to output to, may not be null
Throws:
IllegalArgumentException - if the writer is null
Since:
2.0

getRootCauseStackTrace

public static String[] getRootCauseStackTrace(Throwable throwable)

Creates a compact stack trace for the root cause of the supplied Throwable.

Parameters:
throwable - the throwable to examine, may be null
Returns:
an array of stack trace frames, never null
Since:
2.0

removeCommonFrames

public static void removeCommonFrames(List causeFrames,
                                      List wrapperFrames)

Removes common frames from the cause trace given the two stack traces.

Parameters:
causeFrames - stack trace of a cause throwable
wrapperFrames - stack trace of a wrapper throwable
Throws:
IllegalArgumentException - if either argument is null
Since:
2.0

getStackTrace

public static String getStackTrace(Throwable throwable)

Gets the stack trace from a Throwable as a String.

Parameters:
throwable - the Throwable to be examined
Returns:
the stack trace as generated by the exception's printStackTrace(PrintWriter) method

getFullStackTrace

public static String getFullStackTrace(Throwable throwable)

A way to get the entire nested stack-trace of an throwable.

Parameters:
throwable - the Throwable to be examined
Returns:
the nested stack trace, with the root cause first
Since:
2.0

getStackFrames

public static String[] getStackFrames(Throwable throwable)

Captures the stack trace associated with the specified Throwable object, decomposing it into a list of stack frames.

Parameters:
throwable - the Throwable to exaamine, may be null
Returns:
an array of strings describing each stack frame, never null
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