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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package jodd.exception;
import jodd.io.StreamUtil;
import jodd.util.StringUtil;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.UndeclaredThrowableException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
/**
* Few exception utilities.
*/
public class ExceptionUtil {
/**
* Returns current stack trace in form of array of stack trace elements.
* First stack trace element is removed.
* Since an exception is thrown internally, this method is slow.
*/
@SuppressWarnings({"ThrowCaughtLocally"})
public static StackTraceElement[] getCurrentStackTrace() {
StackTraceElement[] ste = new Exception().getStackTrace();
if (ste.length > 1) {
StackTraceElement[] result = new StackTraceElement[ste.length - 1];
System.arraycopy(ste, 1, result, 0, ste.length - 1);
return result;
} else {
return ste;
}
}
// ---------------------------------------------------------------- exception stack trace
/**
* Returns stack trace filtered by class names.
*/
public static StackTraceElement[] getStackTrace(final Throwable t, final String[] allow, final String[] deny) {
StackTraceElement[] st = t.getStackTrace();
ArrayList result = new ArrayList<>(st.length);
elementLoop:
for (StackTraceElement element : st) {
String className = element.getClassName();
if (allow != null) {
boolean validElemenet = false;
for (String filter : allow) {
if (className.contains(filter)) {
validElemenet = true;
break;
}
}
if (!validElemenet) {
continue;
}
}
if (deny != null) {
for (String filter : deny) {
if (className.contains(filter)) {
continue elementLoop;
}
}
}
result.add(element);
}
st = new StackTraceElement[result.size()];
return result.toArray(st);
}
/**
* Returns stack trace chain filtered by class names.
*/
public static StackTraceElement[][] getStackTraceChain(Throwable t, final String[] allow, final String[] deny) {
ArrayList result = new ArrayList<>();
while (t != null) {
StackTraceElement[] stack = getStackTrace(t, allow, deny);
result.add(stack);
t = t.getCause();
}
StackTraceElement[][] allStacks = new StackTraceElement[result.size()][];
for (int i = 0; i < allStacks.length; i++) {
allStacks[i] = result.get(i);
}
return allStacks;
}
/**
* Returns exception chain starting from top up to root cause.
*/
public static Throwable[] getExceptionChain(Throwable throwable) {
ArrayList list = new ArrayList<>();
list.add(throwable);
while ((throwable = throwable.getCause()) != null) {
list.add(throwable);
}
Throwable[] result = new Throwable[list.size()];
return list.toArray(result);
}
// ---------------------------------------------------------------- exception to string
/**
* Prints stack trace into a String.
*/
public static String exceptionStackTraceToString(final Throwable t) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw, true);
t.printStackTrace(pw);
StreamUtil.close(pw);
StreamUtil.close(sw);
return sw.toString();
}
/**
* Prints full exception stack trace, from top to root cause, into a String.
*/
public static String exceptionChainToString(Throwable t) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw, true);
while (t != null) {
t.printStackTrace(pw);
t = t.getCause();
}
StreamUtil.close(pw);
StreamUtil.close(sw);
return sw.toString();
}
/**
* Build a message for the given base message and its cause.
*/
public static String buildMessage(final String message, Throwable cause) {
if (cause != null) {
cause = getRootCause(cause);
StringBuilder buf = new StringBuilder();
if (message != null) {
buf.append(message).append("; ");
}
buf.append("<--- ").append(cause);
return buf.toString();
} else {
return message;
}
}
// ---------------------------------------------------------------- root cause
/**
* Introspects the Throwable to obtain the root cause.
*
* This method walks through the exception chain to the last element,
* "root" of the tree, and returns that exception. If no root cause found
* returns provided throwable.
*/
public static Throwable getRootCause(final Throwable throwable) {
Throwable cause = throwable.getCause();
if (cause == null) {
return throwable;
}
Throwable t = throwable;
// defend against (malicious?) circularity
for (int i = 0; i < 1000; i++) {
cause = t.getCause();
if (cause == null) {
return t;
}
t = cause;
}
return throwable;
}
/**
* Finds throwing cause in exception stack. Returns throwable object if cause class is matched.
* Otherwise, returns null.
*/
@SuppressWarnings({"unchecked"})
public static T findCause(Throwable throwable, final Class cause) {
while (throwable != null) {
if (throwable.getClass().equals(cause)) {
return (T) throwable;
}
throwable = throwable.getCause();
}
return null;
}
// ---------------------------------------------------------------- sql
/**
* Rolls up SQL exceptions by taking each proceeding exception
* and making it a child of the previous using the setNextException
* method of SQLException.
*/
public static SQLException rollupSqlExceptions(final Collection exceptions) {
SQLException parent = null;
for (SQLException exception : exceptions) {
if (parent != null) {
exception.setNextException(parent);
}
parent = exception;
}
return parent;
}
// ---------------------------------------------------------------- misc
/**
* Throws checked exceptions in un-checked manner.
*/
public static void throwRuntimeException(final Throwable throwable) {
throw wrapToRuntimeException(throwable);
}
/**
* Returns non-null message for a throwable.
*/
public static String message(final Throwable throwable) {
String message = throwable.getMessage();
if (StringUtil.isBlank(message)) {
message = throwable.toString();
}
return message;
}
/**
* Wraps exception to {@code RuntimeException}.
*/
public static RuntimeException wrapToRuntimeException(final Throwable throwable) {
if (throwable instanceof RuntimeException) {
return (RuntimeException) throwable;
}
return new RuntimeException(throwable);
}
public static Exception wrapToException(final Throwable throwable) {
if (throwable instanceof Exception) {
return (Exception) throwable;
}
return new RuntimeException(throwable);
}
/**
* Unwraps invocation and undeclared exceptions to real cause.
*/
public static Throwable unwrapThrowable(final Throwable wrappedThrowable) {
Throwable unwrapped = wrappedThrowable;
while (true) {
if (unwrapped instanceof InvocationTargetException) {
unwrapped = ((InvocationTargetException) unwrapped).getTargetException();
}
else if (unwrapped instanceof UndeclaredThrowableException) {
unwrapped = ((UndeclaredThrowableException) unwrapped).getUndeclaredThrowable();
}
else {
return unwrapped;
}
}
}
}