Add method to allow update to list of recognised exception method names
Javadoc Formatting git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137206 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne
parent
4036dc881d
commit
725fd755a1
|
|
@ -1,5 +1,3 @@
|
|||
package org.apache.commons.lang.exception;
|
||||
|
||||
/* ====================================================================
|
||||
* The Apache Software License, Version 1.1
|
||||
*
|
||||
|
|
@ -53,6 +51,7 @@ package org.apache.commons.lang.exception;
|
|||
* information on the Apache Software Foundation, please see
|
||||
* <http://www.apache.org/>.
|
||||
*/
|
||||
package org.apache.commons.lang.exception;
|
||||
|
||||
import java.io.PrintStream;
|
||||
import java.io.PrintWriter;
|
||||
|
|
@ -62,317 +61,289 @@ import java.lang.reflect.InvocationTargetException;
|
|||
import java.lang.reflect.Method;
|
||||
import java.sql.SQLException;
|
||||
import java.util.ArrayList;
|
||||
import java.util.Arrays;
|
||||
import java.util.LinkedList;
|
||||
import java.util.List;
|
||||
import java.util.StringTokenizer;
|
||||
|
||||
import org.apache.commons.lang.ArrayUtils;
|
||||
import org.apache.commons.lang.SystemUtils;
|
||||
|
||||
/**
|
||||
* Utility routines for manipulating <code>Throwable</code> objects.
|
||||
* <p><code>ExceptionUtils</code> provides utilities for manipulating
|
||||
* <code>Throwable</code> objects.</p>
|
||||
*
|
||||
* @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
|
||||
* @author Dmitri Plotnikov
|
||||
* @author Stephen Colebourne
|
||||
* @since 1.0
|
||||
* @version $Id: ExceptionUtils.java,v 1.19 2002/12/23 00:03:47 scolebourne Exp $
|
||||
*/
|
||||
public class ExceptionUtils
|
||||
{
|
||||
public class ExceptionUtils {
|
||||
/**
|
||||
* The names of methods commonly used to access a wrapped
|
||||
* exception.
|
||||
*/
|
||||
protected static final String[] CAUSE_METHOD_NAMES =
|
||||
{
|
||||
protected static String[] CAUSE_METHOD_NAMES = {
|
||||
"getCause",
|
||||
"getNextException",
|
||||
"getTargetException",
|
||||
"getException",
|
||||
"getSourceException",
|
||||
"getRootCause",
|
||||
"getCausedByException"
|
||||
"getCausedByException",
|
||||
"getNested"
|
||||
};
|
||||
|
||||
/**
|
||||
* The empty parameter list passed to methods used to access a
|
||||
* wrapped exception.
|
||||
*/
|
||||
protected static final Object[] CAUSE_METHOD_PARAMS = {};
|
||||
|
||||
/**
|
||||
* Constructs a new <code>ExceptionUtils</code>. Protected to
|
||||
* Constructs a new <code>ExceptionUtils</code>. Protected to
|
||||
* discourage instantiation.
|
||||
*/
|
||||
protected ExceptionUtils()
|
||||
{
|
||||
protected ExceptionUtils() {
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Introspects the specified <code>Throwable</code> for a
|
||||
* <code>getCause()</code>, <code>getNextException()</code>,
|
||||
* <code>getTargetException()</code>, or
|
||||
* <code>getException()</code> method which returns a
|
||||
* <code>Throwable</code> object (standard as of JDK 1.4, and part
|
||||
* of the {@link
|
||||
* org.apache.commons.lang.exception.NestableException} API),
|
||||
* extracting and returning the cause of the exception. In the
|
||||
* absence of any such method, the object is inspected for a
|
||||
* <code>detail</code> field assignable to a
|
||||
* <code>Throwable</code>. If none of the above is found, returns
|
||||
* <code>null</code>.
|
||||
* <p>Adds to the list of method names used in the search for <code>Throwable</code>
|
||||
* objects.</p>
|
||||
*
|
||||
* @param methodName the methodName to add to the list, null and empty strings are ignored
|
||||
*/
|
||||
public static void addCauseMethodName(String methodName) {
|
||||
if (methodName != null && methodName.length() > 0) {
|
||||
List list = new ArrayList(Arrays.asList(CAUSE_METHOD_NAMES));
|
||||
list.add(methodName);
|
||||
CAUSE_METHOD_NAMES = (String[]) list.toArray(new String[list.size()]);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* <p>Introspects the specified <code>Throwable</code> to obtain the cause.</p>
|
||||
*
|
||||
* <p>The method searches for methods with specific names that return a
|
||||
* <code>Throwable</code> object. This will pick up most wrapping exceptions,
|
||||
* including those from JDK 1.4, and
|
||||
* {@link org.apache.commons.lang.exception.NestableException NestableException}.
|
||||
* The method names can be added to using {@link #addCauseMethodName(String)}.
|
||||
* The default list searched for are:</p>
|
||||
* <ul>
|
||||
* <li><code>getCause()</code>
|
||||
* <li><code>getNextException()</code>
|
||||
* <li><code>getTargetException()</code>
|
||||
* <li><code>getException()</code>
|
||||
* <li><code>getSourceException()</code>
|
||||
* <li><code>getRootCause()</code>
|
||||
* <li><code>getCausedByException()</code>
|
||||
* <li><code>getNested()</code>
|
||||
* </ul>
|
||||
*
|
||||
* <p>In the absence of any such method, the object is inspected for a
|
||||
* <code>detail</code> field assignable to a <code>Throwable</code>.</p>
|
||||
*
|
||||
* <p>If none of the above is found, returns <code>null</code>.</p>
|
||||
*
|
||||
* @param t The exception to introspect for a cause.
|
||||
* @param throwable The exception to introspect for a cause.
|
||||
* @return The cause of the <code>Throwable</code>.
|
||||
* @throws NullPointerException if the throwable is null
|
||||
*/
|
||||
public static Throwable getCause(Throwable t)
|
||||
{
|
||||
return getCause(t, CAUSE_METHOD_NAMES);
|
||||
public static Throwable getCause(Throwable throwable) {
|
||||
return getCause(throwable, CAUSE_METHOD_NAMES);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Extends the API of {@link #getCause(Throwable)} by
|
||||
* introspecting for only user-specified method names.
|
||||
* <p>Introspects the specified <code>Throwable</code> to obtain the cause
|
||||
* using a supplied array of method names.</p>
|
||||
*
|
||||
* @see #getCause(Throwable)
|
||||
* @param throwable The exception to introspect for a cause.
|
||||
* @return The cause of the <code>Throwable</code>.
|
||||
* @throws NullPointerException if the method names array is null or contains null
|
||||
* @throws NullPointerException if the throwable is null
|
||||
*/
|
||||
public static Throwable getCause(Throwable t, String[] methodNames)
|
||||
{
|
||||
Throwable cause = getCauseUsingWellKnownTypes(t);
|
||||
if (cause == null)
|
||||
{
|
||||
for (int i = 0; i < methodNames.length; i++)
|
||||
{
|
||||
cause = getCauseUsingMethodName(t, methodNames[i]);
|
||||
if (cause != null)
|
||||
{
|
||||
public static Throwable getCause(Throwable throwable, String[] methodNames) {
|
||||
Throwable cause = getCauseUsingWellKnownTypes(throwable);
|
||||
if (cause == null) {
|
||||
for (int i = 0; i < methodNames.length; i++) {
|
||||
cause = getCauseUsingMethodName(throwable, methodNames[i]);
|
||||
if (cause != null) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (cause == null)
|
||||
{
|
||||
cause = getCauseUsingFieldName(t, "detail");
|
||||
}
|
||||
}
|
||||
return cause;
|
||||
}
|
||||
|
||||
/**
|
||||
* Walks through the exception chain to the last element -- the
|
||||
* "root" of the tree -- using {@link #getCause(Throwable)}, and
|
||||
* returns that exception.
|
||||
*
|
||||
* @return The root cause of the <code>Throwable</code>.
|
||||
* @see #getCause(Throwable)
|
||||
*/
|
||||
public static Throwable getRootCause(Throwable t)
|
||||
{
|
||||
Throwable cause = getCause(t);
|
||||
if (cause != null)
|
||||
{
|
||||
t = cause;
|
||||
while ((t = getCause(t)) != null)
|
||||
{
|
||||
cause = t;
|
||||
if (cause == null) {
|
||||
cause = getCauseUsingFieldName(throwable, "detail");
|
||||
}
|
||||
}
|
||||
return cause;
|
||||
}
|
||||
|
||||
/**
|
||||
* Uses <code>instanceof</code> checks to examine the exception,
|
||||
* looking for well known types which could contain chained or
|
||||
* wrapped exceptions.
|
||||
* <p>Walks through the exception chain to the last element -- the
|
||||
* "root" of the tree -- using {@link #getCause(Throwable)}, and
|
||||
* returns that exception.</p>
|
||||
*
|
||||
* @param t The exception to examine.
|
||||
* @param throwable the throwable to get the root cause for
|
||||
* @return The root cause of the <code>Throwable</code>.
|
||||
*/
|
||||
public static Throwable getRootCause(Throwable throwable) {
|
||||
Throwable cause = getCause(throwable);
|
||||
if (cause != null) {
|
||||
throwable = cause;
|
||||
while ((throwable = getCause(throwable)) != null) {
|
||||
cause = throwable;
|
||||
}
|
||||
}
|
||||
return cause;
|
||||
}
|
||||
|
||||
/**
|
||||
* <p>Uses <code>instanceof</code> checks to examine the exception,
|
||||
* looking for well known types which could contain chained or
|
||||
* wrapped exceptions.</p>
|
||||
*
|
||||
* @param throwable the exception to examine
|
||||
* @return The wrapped exception, or <code>null</code> if not
|
||||
* found.
|
||||
*/
|
||||
private static Throwable getCauseUsingWellKnownTypes(Throwable t)
|
||||
{
|
||||
if (t instanceof Nestable)
|
||||
{
|
||||
return ((Nestable) t).getCause();
|
||||
}
|
||||
else if (t instanceof SQLException)
|
||||
{
|
||||
return ((SQLException) t).getNextException();
|
||||
}
|
||||
else if (t instanceof InvocationTargetException)
|
||||
{
|
||||
return ((InvocationTargetException) t).getTargetException();
|
||||
}
|
||||
else
|
||||
{
|
||||
private static Throwable getCauseUsingWellKnownTypes(Throwable throwable) {
|
||||
if (throwable instanceof Nestable) {
|
||||
return ((Nestable) throwable).getCause();
|
||||
} else if (throwable instanceof SQLException) {
|
||||
return ((SQLException) throwable).getNextException();
|
||||
} else if (throwable instanceof InvocationTargetException) {
|
||||
return ((InvocationTargetException) throwable).getTargetException();
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @param t The exception to examine.
|
||||
* @param methodName The name of the method to find and invoke.
|
||||
* <p>Find a throwable by method name.</p>
|
||||
*
|
||||
* @param throwable the exception to examine
|
||||
* @param methodName the name of the method to find and invoke
|
||||
* @return The wrapped exception, or <code>null</code> if not
|
||||
* found.
|
||||
*/
|
||||
private static Throwable getCauseUsingMethodName(Throwable t,
|
||||
String methodName)
|
||||
{
|
||||
private static Throwable getCauseUsingMethodName(Throwable throwable, String methodName) {
|
||||
Method method = null;
|
||||
try
|
||||
{
|
||||
method = t.getClass().getMethod(methodName, null);
|
||||
}
|
||||
catch (NoSuchMethodException ignored)
|
||||
{
|
||||
}
|
||||
catch (SecurityException ignored)
|
||||
{
|
||||
try {
|
||||
method = throwable.getClass().getMethod(methodName, null);
|
||||
} catch (NoSuchMethodException ignored) {
|
||||
} catch (SecurityException ignored) {
|
||||
}
|
||||
|
||||
if (method != null &&
|
||||
Throwable.class.isAssignableFrom(method.getReturnType()))
|
||||
{
|
||||
try
|
||||
{
|
||||
return (Throwable) method.invoke(t, CAUSE_METHOD_PARAMS);
|
||||
}
|
||||
catch (IllegalAccessException ignored)
|
||||
{
|
||||
}
|
||||
catch (IllegalArgumentException ignored)
|
||||
{
|
||||
}
|
||||
catch (InvocationTargetException ignored)
|
||||
{
|
||||
if (method != null && Throwable.class.isAssignableFrom(method.getReturnType())) {
|
||||
try {
|
||||
return (Throwable) method.invoke(throwable, ArrayUtils.EMPTY_OBJECT_ARRAY);
|
||||
} catch (IllegalAccessException ignored) {
|
||||
} catch (IllegalArgumentException ignored) {
|
||||
} catch (InvocationTargetException ignored) {
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
/**
|
||||
* @param t The exception to examine.
|
||||
* @param fieldName The name of the attribute to examine.
|
||||
* <p>Find a throwable by field name.</p>
|
||||
*
|
||||
* @param throwable the exception to examine
|
||||
* @param fieldName the name of the attribute to examine
|
||||
* @return The wrapped exception, or <code>null</code> if not
|
||||
* found.
|
||||
*/
|
||||
private static Throwable getCauseUsingFieldName(Throwable t,
|
||||
String fieldName)
|
||||
{
|
||||
private static Throwable getCauseUsingFieldName(Throwable throwable, String fieldName) {
|
||||
Field field = null;
|
||||
try
|
||||
{
|
||||
field = t.getClass().getField(fieldName);
|
||||
}
|
||||
catch (NoSuchFieldException ignored)
|
||||
{
|
||||
}
|
||||
catch (SecurityException ignored)
|
||||
{
|
||||
try {
|
||||
field = throwable.getClass().getField(fieldName);
|
||||
} catch (NoSuchFieldException ignored) {
|
||||
} catch (SecurityException ignored) {
|
||||
}
|
||||
|
||||
if (field != null &&
|
||||
Throwable.class.isAssignableFrom(field.getType()))
|
||||
{
|
||||
try
|
||||
{
|
||||
return (Throwable) field.get(t);
|
||||
}
|
||||
catch (IllegalAccessException ignored)
|
||||
{
|
||||
}
|
||||
catch (IllegalArgumentException ignored)
|
||||
{
|
||||
if (field != null && Throwable.class.isAssignableFrom(field.getType())) {
|
||||
try {
|
||||
return (Throwable) field.get(throwable);
|
||||
} catch (IllegalAccessException ignored) {
|
||||
} catch (IllegalArgumentException ignored) {
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the number of <code>Throwable</code> objects in the
|
||||
* exception chain.
|
||||
* <p>Returns the number of <code>Throwable</code> objects in the
|
||||
* exception chain.</p>
|
||||
*
|
||||
* @param t The exception to inspect.
|
||||
* @param throwable the exception to inspect
|
||||
* @return The throwable count.
|
||||
*/
|
||||
public static int getThrowableCount(Throwable t)
|
||||
{
|
||||
public static int getThrowableCount(Throwable throwable) {
|
||||
// Count the number of throwables
|
||||
int count = 0;
|
||||
while (t != null)
|
||||
{
|
||||
while (throwable != null) {
|
||||
count++;
|
||||
t = ExceptionUtils.getCause(t);
|
||||
throwable = ExceptionUtils.getCause(throwable);
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the list of <code>Throwable</code> objects in the
|
||||
* exception chain.
|
||||
* <p>Returns the list of <code>Throwable</code> objects in the
|
||||
* exception chain.</p>
|
||||
*
|
||||
* @param t The exception to inspect.
|
||||
* @param throwable the exception to inspect
|
||||
* @return The list of <code>Throwable</code> objects.
|
||||
*/
|
||||
public static Throwable[] getThrowables(Throwable t)
|
||||
{
|
||||
public static Throwable[] getThrowables(Throwable throwable) {
|
||||
List list = new ArrayList();
|
||||
while (t != null)
|
||||
{
|
||||
list.add(t);
|
||||
t = ExceptionUtils.getCause(t);
|
||||
while (throwable != null) {
|
||||
list.add(throwable);
|
||||
throwable = ExceptionUtils.getCause(throwable);
|
||||
}
|
||||
return (Throwable []) list.toArray(new Throwable[list.size()]);
|
||||
return (Throwable[]) list.toArray(new Throwable[list.size()]);
|
||||
}
|
||||
|
||||
/**
|
||||
* Delegates to {@link #indexOfThrowable(Throwable, Class, int)},
|
||||
* starting the search at the beginning of the exception chain.
|
||||
* <p>Delegates to {@link #indexOfThrowable(Throwable, Class, int)},
|
||||
* starting the search at the beginning of the exception chain.</p>
|
||||
*
|
||||
* @see #indexOfThrowable(Throwable, Class, int)
|
||||
*/
|
||||
public static int indexOfThrowable(Throwable t, Class type)
|
||||
{
|
||||
return indexOfThrowable(t, type, 0);
|
||||
public static int indexOfThrowable(Throwable throwable, Class type) {
|
||||
return indexOfThrowable(throwable, type, 0);
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the (zero based) index, of the first
|
||||
* <p>Returns the (zero based) index, of the first
|
||||
* <code>Throwable</code> that matches the specified type in the
|
||||
* exception chain of <code>Throwable</code> objects with an index
|
||||
* greater than or equal to the specified index, or
|
||||
* <code>-1</code> if the type is not found.
|
||||
* <code>-1</code> if the type is not found.</p>
|
||||
*
|
||||
* @param t The exception to inspect.
|
||||
* @param type <code>Class</code> to look for.
|
||||
* @param fromIndex The (zero based) index of the starting
|
||||
* position in the chain to be searched.
|
||||
* @return index The first occurrence of the type in the chain, or
|
||||
* <code>-1</code> if the type is not found.
|
||||
* @param throwable the exception to inspect
|
||||
* @param type <code>Class</code> to look for
|
||||
* @param fromIndex the (zero based) index of the starting
|
||||
* position in the chain to be searched
|
||||
* @return the first occurrence of the type in the chain, or
|
||||
* <code>-1</code> if the type is not found
|
||||
* @throws IndexOutOfBoundsException If the <code>fromIndex</code>
|
||||
* argument is negative or not less than the count of
|
||||
* <code>Throwable</code>s in the chain.
|
||||
* argument is negative or not less than the count of
|
||||
* <code>Throwable</code>s in the chain.
|
||||
*/
|
||||
public static int indexOfThrowable(Throwable t, Class type, int fromIndex)
|
||||
{
|
||||
if (fromIndex < 0)
|
||||
{
|
||||
throw new IndexOutOfBoundsException
|
||||
("Throwable index out of range: " + fromIndex);
|
||||
public static int indexOfThrowable(Throwable throwable, Class type, int fromIndex) {
|
||||
if (fromIndex < 0) {
|
||||
throw new IndexOutOfBoundsException("Throwable index out of range: " + fromIndex);
|
||||
}
|
||||
Throwable[] throwables = ExceptionUtils.getThrowables(t);
|
||||
if (fromIndex >= throwables.length)
|
||||
{
|
||||
throw new IndexOutOfBoundsException
|
||||
("Throwable index out of range: " + fromIndex);
|
||||
Throwable[] throwables = ExceptionUtils.getThrowables(throwable);
|
||||
if (fromIndex >= throwables.length) {
|
||||
throw new IndexOutOfBoundsException("Throwable index out of range: " + fromIndex);
|
||||
}
|
||||
for (int i = fromIndex; i < throwables.length; i++)
|
||||
{
|
||||
if (throwables[i].getClass().equals(type))
|
||||
{
|
||||
for (int i = fromIndex; i < throwables.length; i++) {
|
||||
if (throwables[i].getClass().equals(type)) {
|
||||
return i;
|
||||
}
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Prints a compact stack trace for the root cause of a throwable.
|
||||
* The compact stack trace starts with the root cause and prints
|
||||
|
|
@ -383,20 +354,18 @@ public class ExceptionUtils
|
|||
* The method is equivalent to t.printStackTrace() for throwables
|
||||
* that don't have nested causes.
|
||||
*/
|
||||
public static void printRootCauseStackTrace(Throwable t, PrintStream stream)
|
||||
{
|
||||
public static void printRootCauseStackTrace(Throwable t, PrintStream stream) {
|
||||
String trace[] = getRootCauseStackTrace(t);
|
||||
for (int i = 0; i < trace.length; i++){
|
||||
for (int i = 0; i < trace.length; i++) {
|
||||
stream.println(trace[i]);
|
||||
}
|
||||
stream.flush();
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Equivalent to printRootCauseStackTrace(t, System.err)
|
||||
*/
|
||||
public static void printRootCauseStackTrace(Throwable t)
|
||||
{
|
||||
public static void printRootCauseStackTrace(Throwable t) {
|
||||
printRootCauseStackTrace(t, System.err);
|
||||
}
|
||||
|
||||
|
|
@ -404,40 +373,37 @@ public class ExceptionUtils
|
|||
* Same as printRootCauseStackTrace(t, stream), except it takes
|
||||
* a PrintWriter as an argument.
|
||||
*/
|
||||
public static void printRootCauseStackTrace(Throwable t, PrintWriter writer)
|
||||
{
|
||||
public static void printRootCauseStackTrace(Throwable t, PrintWriter writer) {
|
||||
String trace[] = getRootCauseStackTrace(t);
|
||||
for (int i = 0; i < trace.length; i++){
|
||||
for (int i = 0; i < trace.length; i++) {
|
||||
writer.println(trace[i]);
|
||||
}
|
||||
writer.flush();
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Creates a compact stack trace for the root cause of the supplied
|
||||
* throwable.
|
||||
*
|
||||
* See <code>printRootCauseStackTrace(Throwable t, PrintStream s)</code>
*/
|
||||
public static String[] getRootCauseStackTrace(Throwable t)
|
||||
{
|
||||
* See <code>printRootCauseStackTrace(Throwable t, PrintStream s)</code>
|
||||
*/
|
||||
public static String[] getRootCauseStackTrace(Throwable t) {
|
||||
Throwable throwables[] = getThrowables(t);
|
||||
int count = throwables.length;
|
||||
int count = throwables.length;
|
||||
ArrayList frames = new ArrayList();
|
||||
List nextTrace = getStackFrameList(throwables[count-1]);
|
||||
for (int i = count; --i >= 0;){
|
||||
List nextTrace = getStackFrameList(throwables[count - 1]);
|
||||
for (int i = count; --i >= 0;) {
|
||||
List trace = nextTrace;
|
||||
if (i != 0){
|
||||
nextTrace = getStackFrameList(throwables[i-1]);
|
||||
if (i != 0) {
|
||||
nextTrace = getStackFrameList(throwables[i - 1]);
|
||||
removeCommonFrames(trace, nextTrace);
|
||||
}
|
||||
if (i == count - 1){
|
||||
if (i == count - 1) {
|
||||
frames.add(throwables[i].toString());
|
||||
}
|
||||
else {
|
||||
} else {
|
||||
frames.add(" [wrapped] " + throwables[i].toString());
|
||||
}
|
||||
for (int j = 0; j < trace.size(); j++){
|
||||
for (int j = 0; j < trace.size(); j++) {
|
||||
frames.add(trace.get(j));
|
||||
}
|
||||
}
|
||||
|
|
@ -446,25 +412,26 @@ public class ExceptionUtils
|
|||
|
||||
/**
|
||||
* Given two stack traces, removes common frames from the cause trace.
|
||||
*
* @param causeFrames stack trace of a cause throwable
* @param wrapperFrames stack trace of a wrapper throwable
*/
|
||||
private static void removeCommonFrames(List causeFrames, List wrapperFrames)
|
||||
{
|
||||
int causeFrameIndex = causeFrames.size() - 1;
|
||||
*
|
||||
* @param causeFrames stack trace of a cause throwable
|
||||
* @param wrapperFrames stack trace of a wrapper throwable
|
||||
*/
|
||||
private static void removeCommonFrames(List causeFrames, List wrapperFrames) {
|
||||
int causeFrameIndex = causeFrames.size() - 1;
|
||||
int wrapperFrameIndex = wrapperFrames.size() - 1;
|
||||
while (causeFrameIndex >= 0 && wrapperFrameIndex >= 0)
|
||||
{
|
||||
while (causeFrameIndex >= 0 && wrapperFrameIndex >= 0) {
|
||||
// Remove the frame from the cause trace if it is the same
|
||||
// as in the wrapper trace
|
||||
String causeFrame = (String)causeFrames.get(causeFrameIndex);
|
||||
String wrapperFrame = (String)wrapperFrames.get(wrapperFrameIndex);
|
||||
if (causeFrame.equals(wrapperFrame)){
|
||||
String causeFrame = (String) causeFrames.get(causeFrameIndex);
|
||||
String wrapperFrame = (String) wrapperFrames.get(wrapperFrameIndex);
|
||||
if (causeFrame.equals(wrapperFrame)) {
|
||||
causeFrames.remove(causeFrameIndex);
|
||||
}
|
||||
causeFrameIndex--;
|
||||
wrapperFrameIndex--;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* A convenient way of extracting the stack trace from an
|
||||
* exception.
|
||||
|
|
@ -473,8 +440,7 @@ public class ExceptionUtils
|
|||
* @return The stack trace as generated by the exception's
|
||||
* <code>printStackTrace(PrintWriter)</code> method.
|
||||
*/
|
||||
public static String getStackTrace(Throwable t)
|
||||
{
|
||||
public static String getStackTrace(Throwable t) {
|
||||
StringWriter sw = new StringWriter();
|
||||
PrintWriter pw = new PrintWriter(sw, true);
|
||||
t.printStackTrace(pw);
|
||||
|
|
@ -489,8 +455,7 @@ public class ExceptionUtils
|
|||
* @param t The <code>Throwable</code>.
|
||||
* @return An array of strings describing each stack frame.
|
||||
*/
|
||||
public static String[] getStackFrames(Throwable t)
|
||||
{
|
||||
public static String[] getStackFrames(Throwable t) {
|
||||
return getStackFrames(getStackTrace(t));
|
||||
}
|
||||
|
||||
|
|
@ -500,39 +465,39 @@ public class ExceptionUtils
|
|||
* {@link org.apache.commons.lang.exception.NestableDelegate}
|
||||
* classes.
|
||||
*/
|
||||
static String[] getStackFrames(String stackTrace)
|
||||
{
|
||||
static String[] getStackFrames(String stackTrace) {
|
||||
String linebreak = SystemUtils.LINE_SEPARATOR;
|
||||
StringTokenizer frames = new StringTokenizer(stackTrace, linebreak);
|
||||
List list = new LinkedList();
|
||||
while (frames.hasMoreTokens())
|
||||
{
|
||||
while (frames.hasMoreTokens()) {
|
||||
list.add(frames.nextToken());
|
||||
}
|
||||
return (String []) list.toArray(new String[] {});
|
||||
return (String[]) list.toArray(new String[] {
|
||||
});
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Produces a List of stack frames - the message is not included.
|
||||
* This works in most cases - it will only fail if the exception message
|
||||
* contains a line that starts with: " at".
|
||||
*
* @param t is any throwable
* @return List of stack frames
*/
|
||||
static List getStackFrameList(Throwable t){
|
||||
*
|
||||
* @param t is any throwable
|
||||
* @return List of stack frames
|
||||
*/
|
||||
static List getStackFrameList(Throwable t) {
|
||||
String stackTrace = getStackTrace(t);
|
||||
String linebreak = SystemUtils.LINE_SEPARATOR;
|
||||
StringTokenizer frames = new StringTokenizer(stackTrace, linebreak);
|
||||
List list = new LinkedList();
|
||||
boolean traceStarted = false;
|
||||
while (frames.hasMoreTokens())
|
||||
{
|
||||
String token = frames.nextToken();
|
||||
while (frames.hasMoreTokens()) {
|
||||
String token = frames.nextToken();
|
||||
// Determine if the line starts with <whitespace>at
|
||||
int at = token.indexOf("at");
|
||||
if (at != -1 && token.substring(0, at).trim().length() == 0){
|
||||
if (at != -1 && token.substring(0, at).trim().length() == 0) {
|
||||
traceStarted = true;
|
||||
list.add(token);
|
||||
}
|
||||
else if (traceStarted){
|
||||
} else if (traceStarted) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue