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/*******************************************************************************
* Copyright (c) 2005 Contributors.
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v 2.0
* which accompanies this distribution and is available at
* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
*
* Contributors:
* Alexandre Vasseur initial implementation
* Abraham Nevado - Lucierna simple caching strategy
*******************************************************************************/
package org.aspectj.weaver.loadtime.definition;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Hashtable;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import org.aspectj.util.LangUtil;
import org.aspectj.weaver.loadtime.definition.Definition.AdviceKind;
import org.aspectj.weaver.loadtime.definition.Definition.DeclareAnnotationKind;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
/**
*
* @author Alexandre Vasseur
* @author A. Nevado
* @author Andy Clement
*/
public class DocumentParser extends DefaultHandler {
/**
* The current DTD public id. The matching dtd will be searched as a resource.
*/
private final static String DTD_PUBLIC_ID = "-//AspectJ//DTD 1.5.0//EN";
/**
* The DTD alias, for better user experience.
*/
private final static String DTD_PUBLIC_ID_ALIAS = "-//AspectJ//DTD//EN";
private final static String ASPECTJ_ELEMENT = "aspectj";
private final static String WEAVER_ELEMENT = "weaver";
private final static String DUMP_ELEMENT = "dump";
private final static String DUMP_BEFOREANDAFTER_ATTRIBUTE = "beforeandafter";
private final static String DUMP_PERCLASSLOADERDIR_ATTRIBUTE = "perclassloaderdumpdir";
private final static String INCLUDE_ELEMENT = "include";
private final static String EXCLUDE_ELEMENT = "exclude";
private final static String OPTIONS_ATTRIBUTE = "options";
private final static String ASPECTS_ELEMENT = "aspects";
private final static String ASPECT_ELEMENT = "aspect";
private final static String CONCRETE_ASPECT_ELEMENT = "concrete-aspect";
private final static String NAME_ATTRIBUTE = "name";
private final static String SCOPE_ATTRIBUTE = "scope";
private final static String REQUIRES_ATTRIBUTE = "requires";
private final static String EXTEND_ATTRIBUTE = "extends";
private final static String PRECEDENCE_ATTRIBUTE = "precedence";
private final static String PERCLAUSE_ATTRIBUTE = "perclause";
private final static String POINTCUT_ELEMENT = "pointcut";
private final static String BEFORE_ELEMENT = "before";
private final static String AFTER_ELEMENT = "after";
private final static String AFTER_RETURNING_ELEMENT = "after-returning";
private final static String AFTER_THROWING_ELEMENT = "after-throwing";
private final static String AROUND_ELEMENT = "around";
private final static String WITHIN_ATTRIBUTE = "within";
private final static String EXPRESSION_ATTRIBUTE = "expression";
private final static String DECLARE_ANNOTATION_ELEMENT = "declare-annotation";
private final Definition definition;
private boolean inAspectJ;
private boolean inWeaver;
private boolean inAspects;
private Definition.ConcreteAspect activeConcreteAspectDefinition;
private static Hashtable parsedFiles = new Hashtable<>();
private static boolean CACHE;
private static final boolean LIGHTPARSER;
static {
boolean value = false;
try {
value = System.getProperty("org.aspectj.weaver.loadtime.configuration.cache", "true").equalsIgnoreCase("true");
} catch (Throwable t) {
t.printStackTrace();
}
CACHE = value;
value = false;
try {
value = System.getProperty("org.aspectj.weaver.loadtime.configuration.lightxmlparser", "false")
.equalsIgnoreCase("true");
} catch (Throwable t) {
t.printStackTrace();
}
LIGHTPARSER = value;
}
private DocumentParser() {
definition = new Definition();
}
public static Definition parse(final URL url) throws Exception {
if (CACHE && parsedFiles.containsKey(url.toString())) {
return parsedFiles.get(url.toString());
}
Definition def = null;
if (LIGHTPARSER) {
def = SimpleAOPParser.parse(url);
} else {
def = saxParsing(url);
}
if (CACHE && def.getAspectClassNames().size() > 0) {
parsedFiles.put(url.toString(), def);
}
return def;
}
private static Definition saxParsing(URL url) throws SAXException, ParserConfigurationException, IOException {
DocumentParser parser = new DocumentParser();
XMLReader xmlReader = getXMLReader();
xmlReader.setContentHandler(parser);
xmlReader.setErrorHandler(parser);
try {
xmlReader.setFeature("http://xml.org/sax/features/validation", false);
} catch (SAXException e) {
// fine, the parser don't do validation
}
try {
xmlReader.setFeature("http://xml.org/sax/features/external-general-entities", false);
} catch (SAXException e) {
// fine, the parser don't do validation
}
try {
xmlReader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
} catch (SAXException e) {
// fine, the parser don't do validation
}
xmlReader.setEntityResolver(parser);
InputStream in = url.openStream();
xmlReader.parse(new InputSource(in));
return parser.definition;
}
private static XMLReader getXMLReader() throws SAXException, ParserConfigurationException {
XMLReader xmlReader = null;
/* Try this first for Java 5 */
try {
xmlReader = XMLReaderFactory.createXMLReader();
}
/* .. and ignore "System property ... not set" and then try this instead */
catch (SAXException ex) {
xmlReader = SAXParserFactory.newInstance().newSAXParser().getXMLReader();
}
return xmlReader;
}
public InputSource resolveEntity(String publicId, String systemId) throws SAXException {
if (publicId.equals(DTD_PUBLIC_ID) || publicId.equals(DTD_PUBLIC_ID_ALIAS)) {
InputStream in = DocumentParser.class.getResourceAsStream("/aspectj_1_5_0.dtd");
if (in == null) {
System.err.println("AspectJ - WARN - could not read DTD " + publicId);
return null;
} else {
return new InputSource(in);
}
} else {
System.err.println("AspectJ - WARN - unknown DTD " + publicId + " - consider using " + DTD_PUBLIC_ID);
return null;
}
}
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
if (ASPECT_ELEMENT.equals(qName)) {
String name = attributes.getValue(NAME_ATTRIBUTE);
String scopePattern = replaceXmlAnd(attributes.getValue(SCOPE_ATTRIBUTE));
String requiredType = attributes.getValue(REQUIRES_ATTRIBUTE);
if (!isNull(name)) {
definition.getAspectClassNames().add(name);
if (scopePattern != null) {
definition.addScopedAspect(name, scopePattern);
}
if (requiredType != null) {
definition.setAspectRequires(name, requiredType);
}
}
} else if (WEAVER_ELEMENT.equals(qName)) {
String options = attributes.getValue(OPTIONS_ATTRIBUTE);
if (!isNull(options)) {
definition.appendWeaverOptions(options);
}
inWeaver = true;
} else if (CONCRETE_ASPECT_ELEMENT.equals(qName)) {
String name = attributes.getValue(NAME_ATTRIBUTE);
String extend = attributes.getValue(EXTEND_ATTRIBUTE);
String precedence = attributes.getValue(PRECEDENCE_ATTRIBUTE);
String perclause = attributes.getValue(PERCLAUSE_ATTRIBUTE);
if (!isNull(name)) {
activeConcreteAspectDefinition = new Definition.ConcreteAspect(name, extend, precedence, perclause);
// if (isNull(precedence) && !isNull(extend)) {// if no precedence, then extends must be there
// m_lastConcreteAspect = new Definition.ConcreteAspect(name, extend);
// } else if (!isNull(precedence)) {
// // wether a pure precedence def, or an extendsANDprecedence def.
// m_lastConcreteAspect = new Definition.ConcreteAspect(name, extend, precedence, perclause);
// }
definition.getConcreteAspects().add(activeConcreteAspectDefinition);
}
} else if (POINTCUT_ELEMENT.equals(qName) && activeConcreteAspectDefinition != null) {
String name = attributes.getValue(NAME_ATTRIBUTE);
String expression = attributes.getValue(EXPRESSION_ATTRIBUTE);
if (!isNull(name) && !isNull(expression)) {
activeConcreteAspectDefinition.pointcuts.add(new Definition.Pointcut(name, replaceXmlAnd(expression)));
}
} else if (DECLARE_ANNOTATION_ELEMENT.equals(qName) && activeConcreteAspectDefinition!=null) {
String methodSig = attributes.getValue("method");
String fieldSig = attributes.getValue("field");
String typePat = attributes.getValue("type");
String anno = attributes.getValue("annotation");
if (isNull(anno)) {
throw new SAXException("Badly formed element, 'annotation' value is missing");
}
if (isNull(methodSig) && isNull(fieldSig) && isNull(typePat)) {
throw new SAXException("Badly formed element, need one of 'method'/'field'/'type' specified");
}
if (!isNull(methodSig)) {
// declare @method
activeConcreteAspectDefinition.declareAnnotations.add(new Definition.DeclareAnnotation(DeclareAnnotationKind.Method,
methodSig, anno));
} else if (!isNull(fieldSig)) {
// declare @field
activeConcreteAspectDefinition.declareAnnotations.add(new Definition.DeclareAnnotation(DeclareAnnotationKind.Field,
fieldSig, anno));
} else if (!isNull(typePat)) {
// declare @type
activeConcreteAspectDefinition.declareAnnotations.add(new Definition.DeclareAnnotation(DeclareAnnotationKind.Type,
typePat, anno));
}
} else if (BEFORE_ELEMENT.equals(qName) && activeConcreteAspectDefinition != null) {
String pointcut = attributes.getValue(POINTCUT_ELEMENT);
String adviceClass = attributes.getValue("invokeClass");
String adviceMethod = attributes.getValue("invokeMethod");
if (!isNull(pointcut) && !isNull(adviceClass) && !isNull(adviceMethod)) {
activeConcreteAspectDefinition.pointcutsAndAdvice.add(new Definition.PointcutAndAdvice(AdviceKind.Before,
replaceXmlAnd(pointcut), adviceClass, adviceMethod));
} else {
throw new SAXException("Badly formed element");
}
} else if (AFTER_ELEMENT.equals(qName) && activeConcreteAspectDefinition != null) {
String pointcut = attributes.getValue(POINTCUT_ELEMENT);
String adviceClass = attributes.getValue("invokeClass");
String adviceMethod = attributes.getValue("invokeMethod");
if (!isNull(pointcut) && !isNull(adviceClass) && !isNull(adviceMethod)) {
activeConcreteAspectDefinition.pointcutsAndAdvice.add(new Definition.PointcutAndAdvice(AdviceKind.After,
replaceXmlAnd(pointcut), adviceClass, adviceMethod));
} else {
throw new SAXException("Badly formed element");
}
} else if (AROUND_ELEMENT.equals(qName) && activeConcreteAspectDefinition != null) {
String pointcut = attributes.getValue(POINTCUT_ELEMENT);
String adviceClass = attributes.getValue("invokeClass");
String adviceMethod = attributes.getValue("invokeMethod");
if (!isNull(pointcut) && !isNull(adviceClass) && !isNull(adviceMethod)) {
activeConcreteAspectDefinition.pointcutsAndAdvice.add(new Definition.PointcutAndAdvice(AdviceKind.Around,
replaceXmlAnd(pointcut), adviceClass, adviceMethod));
} else {
throw new SAXException("Badly formed element");
}
} else if (ASPECTJ_ELEMENT.equals(qName)) {
if (inAspectJ) {
throw new SAXException("Found nested element");
}
inAspectJ = true;
} else if (ASPECTS_ELEMENT.equals(qName)) {
inAspects = true;
} else if (INCLUDE_ELEMENT.equals(qName) && inWeaver) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
definition.getIncludePatterns().add(typePattern);
}
} else if (EXCLUDE_ELEMENT.equals(qName) && inWeaver) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
definition.getExcludePatterns().add(typePattern);
}
} else if (DUMP_ELEMENT.equals(qName) && inWeaver) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
definition.getDumpPatterns().add(typePattern);
}
String beforeAndAfter = attributes.getValue(DUMP_BEFOREANDAFTER_ATTRIBUTE);
if (isTrue(beforeAndAfter)) {
definition.setDumpBefore(true);
}
String perWeaverDumpDir = attributes.getValue(DUMP_PERCLASSLOADERDIR_ATTRIBUTE);
if (isTrue(perWeaverDumpDir)) {
definition.setCreateDumpDirPerClassloader(true);
}
} else if (EXCLUDE_ELEMENT.equals(qName) && inAspects) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
definition.getAspectExcludePatterns().add(typePattern);
}
} else if (INCLUDE_ELEMENT.equals(qName) && inAspects) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
definition.getAspectIncludePatterns().add(typePattern);
}
} else {
throw new SAXException("Unknown element while parsing element: " + qName);
}
super.startElement(uri, localName, qName, attributes);
}
private String getWithinAttribute(Attributes attributes) {
return replaceXmlAnd(attributes.getValue(WITHIN_ATTRIBUTE));
}
public void endElement(String uri, String localName, String qName) throws SAXException {
if (CONCRETE_ASPECT_ELEMENT.equals(qName)) {
activeConcreteAspectDefinition = null;
} else if (ASPECTJ_ELEMENT.equals(qName)) {
inAspectJ = false;
} else if (WEAVER_ELEMENT.equals(qName)) {
inWeaver = false;
} else if (ASPECTS_ELEMENT.equals(qName)) {
inAspects = false;
}
super.endElement(uri, localName, qName);
}
// TODO AV - define what we want for XML parser error - for now stderr
public void warning(SAXParseException e) throws SAXException {
super.warning(e);
}
public void error(SAXParseException e) throws SAXException {
super.error(e);
}
public void fatalError(SAXParseException e) throws SAXException {
super.fatalError(e);
}
private static String replaceXmlAnd(String expression) {
// TODO AV do we need to handle "..)AND" or "AND(.." ?
return LangUtil.replace(expression, " AND ", " && ");
}
private boolean isNull(String s) {
return (s == null || s.length() <= 0);
}
private boolean isTrue(String s) {
return (s != null && s.equals("true"));
}
/**
* Turn off caching
*/
public static void deactivateCaching() {
CACHE = false;
}
}
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