org.apache.xml.dtm.DTMException Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
/*
* $Id: DTMException.java 468653 2006-10-28 07:07:05Z minchau $
*/
package org.apache.xml.dtm;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.xml.transform.SourceLocator;
import org.apache.xml.res.XMLErrorResources;
import org.apache.xml.res.XMLMessages;
/**
* This class specifies an exceptional condition that occured
* in the DTM module.
*/
public class DTMException extends RuntimeException {
static final long serialVersionUID = -775576419181334734L;
/** Field locator specifies where the error occured.
* @serial */
SourceLocator locator;
/**
* Method getLocator retrieves an instance of a SourceLocator
* object that specifies where an error occured.
*
* @return A SourceLocator object, or null if none was specified.
*/
public SourceLocator getLocator() {
return locator;
}
/**
* Method setLocator sets an instance of a SourceLocator
* object that specifies where an error occured.
*
* @param location A SourceLocator object, or null to clear the location.
*/
public void setLocator(SourceLocator location) {
locator = location;
}
/** Field containedException specifies a wrapped exception. May be null.
* @serial */
Throwable containedException;
/**
* This method retrieves an exception that this exception wraps.
*
* @return An Throwable object, or null.
* @see #getCause
*/
public Throwable getException() {
return containedException;
}
/**
* Returns the cause of this throwable or null if the
* cause is nonexistent or unknown. (The cause is the throwable that
* caused this throwable to get thrown.)
*/
public Throwable getCause() {
return ((containedException == this)
? null
: containedException);
}
/**
* Initializes the cause of this throwable to the specified value.
* (The cause is the throwable that caused this throwable to get thrown.)
*
* This method can be called at most once. It is generally called from
* within the constructor, or immediately after creating the
* throwable. If this throwable was created
* with {@link #DTMException(Throwable)} or
* {@link #DTMException(String,Throwable)}, this method cannot be called
* even once.
*
* @param cause the cause (which is saved for later retrieval by the
* {@link #getCause()} method). (A null value is
* permitted, and indicates that the cause is nonexistent or
* unknown.)
* @return a reference to this Throwable instance.
* @throws IllegalArgumentException if cause is this
* throwable. (A throwable cannot
* be its own cause.)
* @throws IllegalStateException if this throwable was
* created with {@link #DTMException(Throwable)} or
* {@link #DTMException(String,Throwable)}, or this method has already
* been called on this throwable.
*/
public synchronized Throwable initCause(Throwable cause) {
if ((this.containedException == null) && (cause != null)) {
throw new IllegalStateException(XMLMessages.createXMLMessage(XMLErrorResources.ER_CANNOT_OVERWRITE_CAUSE, null)); //"Can't overwrite cause");
}
if (cause == this) {
throw new IllegalArgumentException(
XMLMessages.createXMLMessage(XMLErrorResources.ER_SELF_CAUSATION_NOT_PERMITTED, null)); //"Self-causation not permitted");
}
this.containedException = cause;
return this;
}
/**
* Create a new DTMException.
*
* @param message The error or warning message.
*/
public DTMException(String message) {
super(message);
this.containedException = null;
this.locator = null;
}
/**
* Create a new DTMException wrapping an existing exception.
*
* @param e The exception to be wrapped.
*/
public DTMException(Throwable e) {
super(e.getMessage());
this.containedException = e;
this.locator = null;
}
/**
* Wrap an existing exception in a DTMException.
*
*
This is used for throwing processor exceptions before
* the processing has started.
*
* @param message The error or warning message, or null to
* use the message from the embedded exception.
* @param e Any exception
*/
public DTMException(String message, Throwable e) {
super(((message == null) || (message.length() == 0))
? e.getMessage()
: message);
this.containedException = e;
this.locator = null;
}
/**
* Create a new DTMException from a message and a Locator.
*
* This constructor is especially useful when an application is
* creating its own exception from within a DocumentHandler
* callback.
*
* @param message The error or warning message.
* @param locator The locator object for the error or warning.
*/
public DTMException(String message, SourceLocator locator) {
super(message);
this.containedException = null;
this.locator = locator;
}
/**
* Wrap an existing exception in a DTMException.
*
* @param message The error or warning message, or null to
* use the message from the embedded exception.
* @param locator The locator object for the error or warning.
* @param e Any exception
*/
public DTMException(String message, SourceLocator locator,
Throwable e) {
super(message);
this.containedException = e;
this.locator = locator;
}
/**
* Get the error message with location information
* appended.
*/
public String getMessageAndLocation() {
StringBuffer sbuffer = new StringBuffer();
String message = super.getMessage();
if (null != message) {
sbuffer.append(message);
}
if (null != locator) {
String systemID = locator.getSystemId();
int line = locator.getLineNumber();
int column = locator.getColumnNumber();
if (null != systemID) {
sbuffer.append("; SystemID: ");
sbuffer.append(systemID);
}
if (0 != line) {
sbuffer.append("; Line#: ");
sbuffer.append(line);
}
if (0 != column) {
sbuffer.append("; Column#: ");
sbuffer.append(column);
}
}
return sbuffer.toString();
}
/**
* Get the location information as a string.
*
* @return A string with location info, or null
* if there is no location information.
*/
public String getLocationAsString() {
if (null != locator) {
StringBuffer sbuffer = new StringBuffer();
String systemID = locator.getSystemId();
int line = locator.getLineNumber();
int column = locator.getColumnNumber();
if (null != systemID) {
sbuffer.append("; SystemID: ");
sbuffer.append(systemID);
}
if (0 != line) {
sbuffer.append("; Line#: ");
sbuffer.append(line);
}
if (0 != column) {
sbuffer.append("; Column#: ");
sbuffer.append(column);
}
return sbuffer.toString();
} else {
return null;
}
}
/**
* Print the the trace of methods from where the error
* originated. This will trace all nested exception
* objects, as well as this object.
*/
public void printStackTrace() {
printStackTrace(new java.io.PrintWriter(System.err, true));
}
/**
* Print the the trace of methods from where the error
* originated. This will trace all nested exception
* objects, as well as this object.
* @param s The stream where the dump will be sent to.
*/
public void printStackTrace(java.io.PrintStream s) {
printStackTrace(new java.io.PrintWriter(s));
}
/**
* Print the the trace of methods from where the error
* originated. This will trace all nested exception
* objects, as well as this object.
* @param s The writer where the dump will be sent to.
*/
public void printStackTrace(java.io.PrintWriter s) {
if (s == null) {
s = new java.io.PrintWriter(System.err, true);
}
try {
String locInfo = getLocationAsString();
if (null != locInfo) {
s.println(locInfo);
}
super.printStackTrace(s);
} catch (Throwable e) {}
boolean isJdk14OrHigher = false;
try {
Throwable.class.getMethod("getCause",null);
isJdk14OrHigher = true;
} catch (NoSuchMethodException nsme) {
// do nothing
}
// The printStackTrace method of the Throwable class in jdk 1.4
// and higher will include the cause when printing the backtrace.
// The following code is only required when using jdk 1.3 or lower
if (!isJdk14OrHigher) {
Throwable exception = getException();
for (int i = 0; (i < 10) && (null != exception); i++) {
s.println("---------");
try {
if (exception instanceof DTMException) {
String locInfo =
((DTMException) exception)
.getLocationAsString();
if (null != locInfo) {
s.println(locInfo);
}
}
exception.printStackTrace(s);
} catch (Throwable e) {
s.println("Could not print stack trace...");
}
try {
Method meth =
((Object) exception).getClass().getMethod("getException",
null);
if (null != meth) {
Throwable prev = exception;
exception = (Throwable) meth.invoke(exception, null);
if (prev == exception) {
break;
}
} else {
exception = null;
}
} catch (InvocationTargetException ite) {
exception = null;
} catch (IllegalAccessException iae) {
exception = null;
} catch (NoSuchMethodException nsme) {
exception = null;
}
}
}
}
}