/*******************************************************************************
* Copyright (c) 2005 Contributors.
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0
* which accompanies this distribution and is available at
* http://eclipse.org/legal/epl-v10.html
*
* 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.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;
/**
* FIXME AV - doc, concrete aspect
*
* @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 WITHIN_ATTRIBUTE = "within";
private final static String EXPRESSION_ATTRIBUTE = "expression";
private final Definition m_definition;
private boolean m_inAspectJ;
private boolean m_inWeaver;
private boolean m_inAspects;
private Definition.ConcreteAspect m_lastConcreteAspect;
private static Hashtable<String, Definition> parsedFiles = new Hashtable<String, Definition>();
private static final 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() {
m_definition = new Definition();
}
public static Definition parse(final URL url) throws Exception {
InputStream in = null;
try {
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;
} finally {
try {
in.close();
} catch (Throwable t) {
}
}
}
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.m_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)) {
m_definition.getAspectClassNames().add(name);
if (scopePattern != null) {
m_definition.addScopedAspect(name, scopePattern);
}
if (requiredType != null) {
m_definition.setAspectRequires(name, requiredType);
}
}
} else if (WEAVER_ELEMENT.equals(qName)) {
String options = attributes.getValue(OPTIONS_ATTRIBUTE);
if (!isNull(options)) {
m_definition.appendWeaverOptions(options);
}
m_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)) {
m_lastConcreteAspect = 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);
// }
m_definition.getConcreteAspects().add(m_lastConcreteAspect);
}
} else if (POINTCUT_ELEMENT.equals(qName) && m_lastConcreteAspect != null) {
String name = attributes.getValue(NAME_ATTRIBUTE);
String expression = attributes.getValue(EXPRESSION_ATTRIBUTE);
if (!isNull(name) && !isNull(expression)) {
m_lastConcreteAspect.pointcuts.add(new Definition.Pointcut(name, replaceXmlAnd(expression)));
}
} else if (ASPECTJ_ELEMENT.equals(qName)) {
if (m_inAspectJ) {
throw new SAXException("Found nested <aspectj> element");
}
m_inAspectJ = true;
} else if (ASPECTS_ELEMENT.equals(qName)) {
m_inAspects = true;
} else if (INCLUDE_ELEMENT.equals(qName) && m_inWeaver) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
m_definition.getIncludePatterns().add(typePattern);
}
} else if (EXCLUDE_ELEMENT.equals(qName) && m_inWeaver) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
m_definition.getExcludePatterns().add(typePattern);
}
} else if (DUMP_ELEMENT.equals(qName) && m_inWeaver) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
m_definition.getDumpPatterns().add(typePattern);
}
String beforeAndAfter = attributes.getValue(DUMP_BEFOREANDAFTER_ATTRIBUTE);
if (isTrue(beforeAndAfter)) {
m_definition.setDumpBefore(true);
}
String perWeaverDumpDir = attributes.getValue(DUMP_PERCLASSLOADERDIR_ATTRIBUTE);
if (isTrue(perWeaverDumpDir)) {
m_definition.setCreateDumpDirPerClassloader(true);
}
} else if (EXCLUDE_ELEMENT.equals(qName) && m_inAspects) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
m_definition.getAspectExcludePatterns().add(typePattern);
}
} else if (INCLUDE_ELEMENT.equals(qName) && m_inAspects) {
String typePattern = getWithinAttribute(attributes);
if (!isNull(typePattern)) {
m_definition.getAspectIncludePatterns().add(typePattern);
}
} else {
throw new SAXException("Unknown element while parsing <aspectj> 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)) {
m_lastConcreteAspect = null;
} else if (ASPECTJ_ELEMENT.equals(qName)) {
m_inAspectJ = false;
} else if (WEAVER_ELEMENT.equals(qName)) {
m_inWeaver = false;
} else if (ASPECTS_ELEMENT.equals(qName)) {
m_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"));
}
}