org.apache.jasper.compiler.ErrorDispatcher 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.
*/
package org.apache.jasper.compiler;
import java.net.MalformedURLException;
import org.apache.jasper.JasperException;
import org.apache.jasper.JspCompilationContext;
import org.xml.sax.SAXException;
/**
* Class responsible for dispatching JSP parse and javac compilation errors
* to the configured error handler.
*
* This class is also responsible for localizing any error codes before they
* are passed on to the configured error handler.
*
* In the case of a Java compilation error, the compiler error message is
* parsed into an array of JavacErrorDetail instances, which is passed on to
* the configured error handler.
*
* @author Jan Luehe
* @author Kin-man Chung
*/
public class ErrorDispatcher {
// Custom error handler
private ErrorHandler errHandler;
// Indicates whether the compilation was initiated by JspServlet or JspC
private boolean jspcMode = false;
/*
* Constructor.
*
* @param jspcMode true if compilation has been initiated by JspC, false
* otherwise
*/
public ErrorDispatcher(boolean jspcMode) {
// XXX check web.xml for custom error handler
errHandler = new DefaultErrorHandler();
this.jspcMode = jspcMode;
}
/*
* Dispatches the given javac compilation errors to the configured error
* handler.
*
* @param javacErrors Array of javac compilation errors
*/
public void javacError(JavacErrorDetail[] javacErrors)
throws JasperException {
errHandler.javacError(javacErrors);
}
/*
* Dispatches the given compilation error report and exception to the
* configured error handler.
*
* @param errorReport Compilation error report
* @param e Compilation exception
*/
public void javacError(String errorReport, Exception e)
throws JasperException {
errHandler.javacError(errorReport, e);
}
public void jspError(String errorMessage) throws JasperException {
jspError(null, errorMessage, null);
}
public void jspError(String errorMessage, Exception e) throws JasperException {
jspError(null, errorMessage, e);
}
public void jspError(Mark where, String errorMessage) throws JasperException {
jspError(where, errorMessage, null);
}
/**
* Dispatches the given JSP parse error to the configured error handler.
*
* The given error code is localized. If it is not found in the
* resource bundle for localized error messages, it is used as the error
* message.
*
* @param where Error location
* @param errorMessage The error message
* @param args Arguments for parametric replacement
* @param e Parsing exception
*/
public void jspError(Mark where, String errorMessage, Exception e) throws JasperException {
String file = null;
int line = -1;
int column = -1;
boolean hasLocation = false;
// Get error location
if (where != null) {
if (jspcMode) {
// Get the full URL of the resource that caused the error
try {
file = where.getURL().toString();
} catch (MalformedURLException me) {
// Fallback to using context-relative path
file = where.getFile();
}
} else {
// Get the context-relative resource path, so as to not
// disclose any local filesystem details
file = where.getFile();
}
line = where.getLineNumber();
column = where.getColumnNumber();
hasLocation = true;
}
// Get nested exception
Exception nestedEx = e;
if ((e instanceof SAXException)
&& (((SAXException) e).getException() != null)) {
nestedEx = ((SAXException) e).getException();
}
if (hasLocation) {
errHandler.jspError(file, line, column, errorMessage, nestedEx);
} else {
errHandler.jspError(errorMessage, nestedEx);
}
}
/**
* @param fname
* @param page
* @param errMsgBuf
* @param lineNum
* @return JavacErrorDetail The error details
* @throws JasperException
*/
public static JavacErrorDetail createJavacError(String fname,
Node.Nodes page, StringBuilder errMsgBuf, int lineNum)
throws JasperException {
return createJavacError(fname, page, errMsgBuf, lineNum, null);
}
/**
* @param fname
* @param page
* @param errMsgBuf
* @param lineNum
* @param ctxt
* @return JavacErrorDetail The error details
* @throws JasperException
*/
public static JavacErrorDetail createJavacError(String fname,
Node.Nodes page, StringBuilder errMsgBuf, int lineNum,
JspCompilationContext ctxt) throws JasperException {
JavacErrorDetail javacError;
// Attempt to map javac error line number to line in JSP page
ErrorVisitor errVisitor = new ErrorVisitor(lineNum);
page.visit(errVisitor);
Node errNode = errVisitor.getJspSourceNode();
if ((errNode != null) && (errNode.getStart() != null)) {
// If this is a scriplet node then there is a one to one mapping
// between JSP lines and Java lines
if (errVisitor.getJspSourceNode() instanceof Node.Scriptlet) {
javacError = new JavacErrorDetail(
fname,
lineNum,
errNode.getStart().getFile(),
errNode.getStart().getLineNumber() + lineNum -
errVisitor.getJspSourceNode().getBeginJavaLine(),
errMsgBuf,
ctxt);
} else {
javacError = new JavacErrorDetail(
fname,
lineNum,
errNode.getStart().getFile(),
errNode.getStart().getLineNumber(),
errMsgBuf,
ctxt);
}
} else {
/*
* javac error line number cannot be mapped to JSP page
* line number. For example, this is the case if a
* scriptlet is missing a closing brace, which causes
* havoc with the try-catch-finally block that the code
* generator places around all generated code: As a result
* of this, the javac error line numbers will be outside
* the range of begin and end java line numbers that were
* generated for the scriptlet, and therefore cannot be
* mapped to the start line number of the scriptlet in the
* JSP page.
* Include just the javac error info in the error detail.
*/
javacError = new JavacErrorDetail(
fname,
lineNum,
errMsgBuf);
}
return javacError;
}
/*
* Visitor responsible for mapping a line number in the generated servlet
* source code to the corresponding JSP node.
*/
static class ErrorVisitor extends Node.Visitor {
// Java source line number to be mapped
private int lineNum;
/*
* JSP node whose Java source code range in the generated servlet
* contains the Java source line number to be mapped
*/
Node found;
/*
* Constructor.
*
* @param lineNum Source line number in the generated servlet code
*/
public ErrorVisitor(int lineNum) {
this.lineNum = lineNum;
}
public void doVisit(Node n) throws JasperException {
if ((lineNum >= n.getBeginJavaLine())
&& (lineNum < n.getEndJavaLine())) {
found = n;
}
}
/*
* Gets the JSP node to which the source line number in the generated
* servlet code was mapped.
*
* @return JSP node to which the source line number in the generated
* servlet code was mapped
*/
public Node getJspSourceNode() {
return found;
}
}
}
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