Copyright (c) 2005, 2017 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
/*******************************************************************************
 * Copyright (c) 2005, 2017 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
 *******************************************************************************/
package org.aspectj.weaver.loadtime;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;

import org.aspectj.bridge.AbortException;
import org.aspectj.bridge.Constants;
import org.aspectj.bridge.MessageUtil;
import org.aspectj.util.LangUtil;
import org.aspectj.weaver.IUnwovenClassFile;
import org.aspectj.weaver.Lint;
import org.aspectj.weaver.Lint.Kind;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.World;
import org.aspectj.weaver.bcel.BcelWeakClassLoaderReference;
import org.aspectj.weaver.bcel.BcelWeaver;
import org.aspectj.weaver.bcel.BcelWorld;
import org.aspectj.weaver.bcel.Utility;
import org.aspectj.weaver.loadtime.definition.Definition;
import org.aspectj.weaver.loadtime.definition.DocumentParser;
import org.aspectj.weaver.ltw.LTWWorld;
import org.aspectj.weaver.patterns.PatternParser;
import org.aspectj.weaver.patterns.TypePattern;
import org.aspectj.weaver.tools.GeneratedClassHandler;
import org.aspectj.weaver.tools.Trace;
import org.aspectj.weaver.tools.TraceFactory;
import org.aspectj.weaver.tools.WeavingAdaptor;
import org.aspectj.weaver.tools.cache.WeavedClassCache;

import sun.misc.Unsafe;

Author:
Alexandre Vasseur, Andy Clement, Abraham Nevado, David Knibb, John Kew/**
 * @author Alexandre Vasseur
 * @author Andy Clement
 * @author Abraham Nevado
 * @author David Knibb
 * @author John Kew
 */
public class ClassLoaderWeavingAdaptor extends WeavingAdaptor {

	private final static String AOP_XML = Constants.AOP_USER_XML + ";" + Constants.AOP_AJC_XML + ";" + Constants.AOP_OSGI_XML;

	private boolean initialized;

	private List<TypePattern> dumpTypePattern = new ArrayList<TypePattern>();
	private boolean dumpBefore = false;
	private boolean dumpDirPerClassloader = false;

	private boolean hasExcludes = false;
	private List<TypePattern> excludeTypePattern = new ArrayList<TypePattern>(); // anything
	private List<String> excludeStartsWith = new ArrayList<String>(); // com.foo..*
	private List<String> excludeStarDotDotStar = new ArrayList<String>(); // *..*CGLIB*
	private List<String> excludeExactName = new ArrayList<String>(); // com.foo.Bar
	private List<String> excludeEndsWith = new ArrayList<String>(); // com.foo.Bar
	private List<String[]> excludeSpecial = new ArrayList<String[]>();

	private boolean hasIncludes = false;
	private List<TypePattern> includeTypePattern = new ArrayList<TypePattern>();
	private List<String> includeStartsWith = new ArrayList<String>();
	private List<String> includeExactName = new ArrayList<String>();
	private boolean includeStar = false;

	private List<TypePattern> aspectExcludeTypePattern = new ArrayList<TypePattern>();
	private List<String> aspectExcludeStartsWith = new ArrayList<String>();
	private List<TypePattern> aspectIncludeTypePattern = new ArrayList<TypePattern>();
	private List<String> aspectIncludeStartsWith = new ArrayList<String>();

	private StringBuffer namespace;
	private IWeavingContext weavingContext;

	private List<ConcreteAspectCodeGen> concreteAspects = new ArrayList<ConcreteAspectCodeGen>();

	private static Trace trace = TraceFactory.getTraceFactory().getTrace(ClassLoaderWeavingAdaptor.class);

	public ClassLoaderWeavingAdaptor() {
		super();
		if (trace.isTraceEnabled()) {
			trace.enter("<init>", this);
		}
		if (trace.isTraceEnabled()) {
			trace.exit("<init>");
		}
	}

	
We don't need a reference to the class loader and using it during construction can cause problems with recursion. It also
makes sense to supply the weaving context during initialization to.
Deprecated:
/**
	 * We don't need a reference to the class loader and using it during construction can cause problems with recursion. It also
	 * makes sense to supply the weaving context during initialization to.
	 *
	 * @deprecated
	 */
	@Deprecated
	public ClassLoaderWeavingAdaptor(final ClassLoader deprecatedLoader, final IWeavingContext deprecatedContext) {
		super();
		if (trace.isTraceEnabled()) {
			trace.enter("<init>", this, new Object[] { deprecatedLoader, deprecatedContext });
		}
		if (trace.isTraceEnabled()) {
			trace.exit("<init>");
		}
	}

	class SimpleGeneratedClassHandler implements GeneratedClassHandler {
		private BcelWeakClassLoaderReference loaderRef;

		SimpleGeneratedClassHandler(ClassLoader loader) {
			loaderRef = new BcelWeakClassLoaderReference(loader);
		}

		
Callback when we need to define a Closure in the JVM
/**
		 * Callback when we need to define a Closure in the JVM
		 *
		 */
		@Override
		public void acceptClass (String name, byte[] originalBytes, byte[] wovenBytes) {
			try {
				if (shouldDump(name.replace('/', '.'), false)) {
					dump(name, wovenBytes, false);
				}
			} catch (Throwable throwable) {
				throwable.printStackTrace();
			}
			if (activeProtectionDomain != null) {
				defineClass(loaderRef.getClassLoader(), name, wovenBytes, activeProtectionDomain);
			} else {
				defineClass(loaderRef.getClassLoader(), name, wovenBytes); // could be done lazily using the hook
			}
		}
	}

	public void initialize(final ClassLoader classLoader, IWeavingContext context) {
		if (initialized) {
			return;
		}

		boolean success = true;

		this.weavingContext = context;
		if (weavingContext == null) {
			weavingContext = new DefaultWeavingContext(classLoader);
		}

		createMessageHandler();

		this.generatedClassHandler = new SimpleGeneratedClassHandler(classLoader);

		List<Definition> definitions = weavingContext.getDefinitions(classLoader, this);
		if (definitions.isEmpty()) {
			disable(); // TODO maw Needed to ensure messages are flushed
			if (trace.isTraceEnabled()) {
				trace.exit("initialize", definitions);
			}
			return;
		}

		// TODO when the world works in terms of the context, we can remove the loader
		bcelWorld = new LTWWorld(classLoader, weavingContext, getMessageHandler(), null);

		weaver = new BcelWeaver(bcelWorld);

		// register the definitions
		success = registerDefinitions(weaver, classLoader, definitions);
		if (success) {

			// after adding aspects
			weaver.prepareForWeave();

			enable(); // TODO maw Needed to ensure messages are flushed
			success = weaveAndDefineConceteAspects();
		}

		if (success) {
			enable();
		} else {
			disable();
			bcelWorld = null;
			weaver = null;
		}
		if (WeavedClassCache.isEnabled()) {
			initializeCache(classLoader, getAspectClassNames(definitions), generatedClassHandler, getMessageHandler());
		}

		initialized = true;
		if (trace.isTraceEnabled()) {
			trace.exit("initialize", isEnabled());
		}
	}

	
Get the list of all aspects from the defintion list
Params:
definitions – 
Returns:
/**
	 * Get the list of all aspects from the defintion list
	 * @param definitions
	 * @return
	 */
	List<String> getAspectClassNames(List<Definition> definitions) {
		List<String> aspects = new LinkedList<String>();
		for (Iterator<Definition> it = definitions.iterator(); it.hasNext(); ) {
			Definition def = it.next();
			List<String> defAspects = def.getAspectClassNames();
			if (defAspects != null) {
				aspects.addAll(defAspects);
			}
		}
		return aspects;
	}

	
Load and cache the aop.xml/properties according to the classloader visibility rules
Params:
loader – /**
	 * Load and cache the aop.xml/properties according to the classloader visibility rules
	 *
	 * @param loader
	 */
	List<Definition> parseDefinitions(final ClassLoader loader) {
		if (trace.isTraceEnabled()) {
			trace.enter("parseDefinitions", this);
		}

		List<Definition> definitions = new ArrayList<Definition>();
		try {
			info("register classloader " + getClassLoaderName(loader));
			// TODO av underoptimized: we will parse each XML once per CL that see it

			// TODO av dev mode needed ? TBD -Daj5.def=...
			if (loader.equals(ClassLoader.getSystemClassLoader())) {
				String file = System.getProperty("aj5.def", null);
				if (file != null) {
					info("using (-Daj5.def) " + file);
					definitions.add(DocumentParser.parse((new File(file)).toURI().toURL()));
				}
			}

			String resourcePath = System.getProperty("org.aspectj.weaver.loadtime.configuration", AOP_XML);
			if (trace.isTraceEnabled()) {
				trace.event("parseDefinitions", this, resourcePath);
			}

			StringTokenizer st = new StringTokenizer(resourcePath, ";");

			while (st.hasMoreTokens()) {
				String nextDefinition = st.nextToken();
				if (nextDefinition.startsWith("file:")) {
					try {
						String fpath = new URL(nextDefinition).getFile();
						File configFile = new File(fpath);
						if (!configFile.exists()) {
							warn("configuration does not exist: " + nextDefinition);
						} else {
							definitions.add(DocumentParser.parse(configFile.toURI().toURL()));
						}
					} catch (MalformedURLException mue) {
						error("malformed definition url: " + nextDefinition);
					}
				} else {
					Enumeration<URL> xmls = weavingContext.getResources(nextDefinition);
					// System.out.println("? registerDefinitions: found-aop.xml=" + xmls.hasMoreElements() + ", loader=" + loader);

					Set<URL> seenBefore = new HashSet<URL>();
					while (xmls.hasMoreElements()) {
						URL xml = xmls.nextElement();
						if (trace.isTraceEnabled()) {
							trace.event("parseDefinitions", this, xml);
						}
						if (!seenBefore.contains(xml)) {
							info("using configuration " + weavingContext.getFile(xml));
							definitions.add(DocumentParser.parse(xml));
							seenBefore.add(xml);
						} else {
							debug("ignoring duplicate definition: " + xml);
						}
					}
				}
			}
			if (definitions.isEmpty()) {
				info("no configuration found. Disabling weaver for class loader " + getClassLoaderName(loader));
			}
		} catch (Exception e) {
			definitions.clear();
			warn("parse definitions failed", e);
		}

		if (trace.isTraceEnabled()) {
			trace.exit("parseDefinitions", definitions);
		}
		return definitions;
	}

	private boolean registerDefinitions(final BcelWeaver weaver, final ClassLoader loader, List<Definition> definitions) {
		if (trace.isTraceEnabled()) {
			trace.enter("registerDefinitions", this, definitions);
		}
		boolean success = true;

		try {
			registerOptions(weaver, loader, definitions);
			registerAspectExclude(weaver, loader, definitions);
			registerAspectInclude(weaver, loader, definitions);
			success = registerAspects(weaver, loader, definitions);
			registerIncludeExclude(weaver, loader, definitions);
			registerDump(weaver, loader, definitions);
		} catch (Exception ex) {
			trace.error("register definition failed", ex);
			success = false;
			warn("register definition failed", (ex instanceof AbortException) ? null : ex);
		}

		if (trace.isTraceEnabled()) {
			trace.exit("registerDefinitions", success);
		}
		return success;
	}

	private String getClassLoaderName(ClassLoader loader) {
		return weavingContext.getClassLoaderName();
	}

	
Configure the weaver according to the option directives TODO av - don't know if it is that good to reuse, since we only allow
a small subset of options in LTW
Params:
weaver – 
loader – 
definitions – /**
	 * Configure the weaver according to the option directives TODO av - don't know if it is that good to reuse, since we only allow
	 * a small subset of options in LTW
	 *
	 * @param weaver
	 * @param loader
	 * @param definitions
	 */
	private void registerOptions(final BcelWeaver weaver, final ClassLoader loader, final List<Definition> definitions) {
		StringBuffer allOptions = new StringBuffer();
		for (Definition definition : definitions) {
			allOptions.append(definition.getWeaverOptions()).append(' ');
		}

		Options.WeaverOption weaverOption = Options.parse(allOptions.toString(), loader, getMessageHandler());

		// configure the weaver and world
		// AV - code duplicates AspectJBuilder.initWorldAndWeaver()
		World world = weaver.getWorld();
		setMessageHandler(weaverOption.messageHandler);
		world.setXlazyTjp(weaverOption.lazyTjp);
		world.setXHasMemberSupportEnabled(weaverOption.hasMember);
		world.setTiming(weaverOption.timers, true);
		world.setOptionalJoinpoints(weaverOption.optionalJoinpoints);
		world.setPinpointMode(weaverOption.pinpoint);
		weaver.setReweavableMode(weaverOption.notReWeavable);
		if (weaverOption.loadersToSkip != null && weaverOption.loadersToSkip.length() > 0) {
			Aj.loadersToSkip = LangUtil.anySplit(weaverOption.loadersToSkip, ",");
		}
		if (Aj.loadersToSkip != null) {
			MessageUtil.info(world.getMessageHandler(),"no longer creating weavers for these classloaders: "+Aj.loadersToSkip);
		}
		world.performExtraConfiguration(weaverOption.xSet);
		world.setXnoInline(weaverOption.noInline);
		// AMC - autodetect as per line below, needed for AtAjLTWTests.testLTWUnweavable
		world.setBehaveInJava5Way(LangUtil.is15VMOrGreater());
		world.setAddSerialVerUID(weaverOption.addSerialVersionUID);

		/* First load defaults */
		bcelWorld.getLint().loadDefaultProperties();

		/* Second overlay LTW defaults */
		bcelWorld.getLint().adviceDidNotMatch.setKind(null);

		/* Third load user file using -Xlintfile so that -Xlint wins */
		if (weaverOption.lintFile != null) {
			InputStream resource = null;
			try {
				resource = loader.getResourceAsStream(weaverOption.lintFile);
				Exception failure = null;
				if (resource != null) {
					try {
						Properties properties = new Properties();
						properties.load(resource);
						world.getLint().setFromProperties(properties);
					} catch (IOException e) {
						failure = e;
					}
				}
				if (failure != null || resource == null) {
					warn("Cannot access resource for -Xlintfile:" + weaverOption.lintFile, failure);
					// world.getMessageHandler().handleMessage(new Message(
					// "Cannot access resource for -Xlintfile:"+weaverOption.lintFile,
					// IMessage.WARNING,
					// failure,
					// null));
				}
			} finally {
				try {
					resource.close();
				} catch (Throwable t) {
				}
			}
		}

		/* Fourth override with -Xlint */
		if (weaverOption.lint != null) {
			if (weaverOption.lint.equals("default")) {// FIXME should be AjBuildConfig.AJLINT_DEFAULT but yetanother deps..
				bcelWorld.getLint().loadDefaultProperties();
			} else {
				bcelWorld.getLint().setAll(weaverOption.lint);
				if (weaverOption.lint.equals("ignore")) {
					bcelWorld.setAllLintIgnored();
				}
			}
		}
		// TODO proceedOnError option
	}

	private void registerAspectExclude(final BcelWeaver weaver, final ClassLoader loader, final List<Definition> definitions) {
		String fastMatchInfo = null;
		for (Definition definition : definitions) {
			for (String exclude : definition.getAspectExcludePatterns()) {
				TypePattern excludePattern = new PatternParser(exclude).parseTypePattern();
				aspectExcludeTypePattern.add(excludePattern);
				fastMatchInfo = looksLikeStartsWith(exclude);
				if (fastMatchInfo != null) {
					aspectExcludeStartsWith.add(fastMatchInfo);
				}
			}
		}
	}

	private void registerAspectInclude(final BcelWeaver weaver, final ClassLoader loader, final List<Definition> definitions) {
		String fastMatchInfo = null;
		for (Definition definition : definitions) {
			for (String include : definition.getAspectIncludePatterns()) {
				TypePattern includePattern = new PatternParser(include).parseTypePattern();
				aspectIncludeTypePattern.add(includePattern);
				fastMatchInfo = looksLikeStartsWith(include);
				if (fastMatchInfo != null) {
					aspectIncludeStartsWith.add(fastMatchInfo);
				}
			}
		}
	}

	protected void lint(String name, String[] infos) {
		Lint lint = bcelWorld.getLint();
		Kind kind = lint.getLintKind(name);
		kind.signal(infos, null, null);
	}

	@Override
	public String getContextId() {
		return weavingContext.getId();
	}

	
Register the aspect, following include / exclude rules
Params:
weaver – 
loader – 
definitions – /**
	 * Register the aspect, following include / exclude rules
	 *
	 * @param weaver
	 * @param loader
	 * @param definitions
	 */
	private boolean registerAspects(final BcelWeaver weaver, final ClassLoader loader, final List<Definition> definitions) {
		if (trace.isTraceEnabled()) {
			trace.enter("registerAspects", this, new Object[] { weaver, loader, definitions });
		}
		boolean success = true;

		// TODO: the exclude aspect allow to exclude aspect defined upper in the CL hierarchy - is it what we want ??
		// if not, review the getResource so that we track which resource is defined by which CL

		// iterate aspectClassNames
		// exclude if in any of the exclude list
		for (Definition definition : definitions) {
			for (String aspectClassName : definition.getAspectClassNames()) {
				if (acceptAspect(aspectClassName)) {
					info("register aspect " + aspectClassName);
					// System.err.println("? ClassLoaderWeavingAdaptor.registerAspects() aspectName=" + aspectClassName +
					// ", loader=" + loader + ", bundle=" + weavingContext.getClassLoaderName());
					String requiredType = definition.getAspectRequires(aspectClassName);
					if (requiredType != null) {
						// This aspect expresses that it requires a type to be around, otherwise it should 'switch off'
						((BcelWorld) weaver.getWorld()).addAspectRequires(aspectClassName, requiredType);
					}
					String definedScope = definition.getScopeForAspect(aspectClassName);
					if (definedScope != null) {
						((BcelWorld) weaver.getWorld()).addScopedAspect(aspectClassName, definedScope);
					}
					// ResolvedType aspect =
					weaver.addLibraryAspect(aspectClassName);

					// generate key for SC
					if (namespace == null) {
						namespace = new StringBuffer(aspectClassName);
					} else {
						namespace = namespace.append(";").append(aspectClassName);
					}

				} else {
					// warn("aspect excluded: " + aspectClassName);
					lint("aspectExcludedByConfiguration", new String[] { aspectClassName, getClassLoaderName(loader) });
				}
			}
		}

		// iterate concreteAspects
		// exclude if in any of the exclude list - note that the user defined name matters for that to happen
		for (Definition definition : definitions) {
			for (Definition.ConcreteAspect concreteAspect : definition.getConcreteAspects()) {
				if (acceptAspect(concreteAspect.name)) {
					info("define aspect " + concreteAspect.name);
					ConcreteAspectCodeGen gen = new ConcreteAspectCodeGen(concreteAspect, weaver.getWorld());
					if (!gen.validate()) {
						error("Concrete-aspect '" + concreteAspect.name + "' could not be registered");
						success = false;
						break;
					}

					((BcelWorld) weaver.getWorld()).addSourceObjectType(Utility.makeJavaClass(concreteAspect.name, gen.getBytes()),
							true);

					concreteAspects.add(gen);

					weaver.addLibraryAspect(concreteAspect.name);

					// generate key for SC
					if (namespace == null) {
						namespace = new StringBuffer(concreteAspect.name);
					} else {
						namespace = namespace.append(";" + concreteAspect.name);
					}
				}
			}
		}

		/* We couldn't register one or more aspects so disable the adaptor */
		if (!success) {
			warn("failure(s) registering aspects. Disabling weaver for class loader " + getClassLoaderName(loader));
		}

		/* We didn't register any aspects so disable the adaptor */
		else if (namespace == null) {
			success = false;
			info("no aspects registered. Disabling weaver for class loader " + getClassLoaderName(loader));
		}

		if (trace.isTraceEnabled()) {
			trace.exit("registerAspects", success);
		}
		return success;
	}

	private boolean weaveAndDefineConceteAspects() {
		if (trace.isTraceEnabled()) {
			trace.enter("weaveAndDefineConceteAspects", this, concreteAspects);
		}
		boolean success = true;

		for (ConcreteAspectCodeGen gen : concreteAspects) {
			String name = gen.getClassName();
			byte[] bytes = gen.getBytes();

			try {
				byte[] newBytes = weaveClass(name, bytes, true);
				this.generatedClassHandler.acceptClass(name, bytes, newBytes);
			} catch (IOException ex) {
				trace.error("weaveAndDefineConceteAspects", ex);
				error("exception weaving aspect '" + name + "'", ex);
			}
		}

		if (trace.isTraceEnabled()) {
			trace.exit("weaveAndDefineConceteAspects", success);
		}
		return success;
	}

	
Register the include / exclude filters. We duplicate simple patterns in startWith filters that will allow faster matching
without ResolvedType
Params:
weaver – 
loader – 
definitions – /**
	 * Register the include / exclude filters. We duplicate simple patterns in startWith filters that will allow faster matching
	 * without ResolvedType
	 *
	 * @param weaver
	 * @param loader
	 * @param definitions
	 */
	private void registerIncludeExclude(final BcelWeaver weaver, final ClassLoader loader, final List<Definition> definitions) {
		String fastMatchInfo = null;
		for (Definition definition : definitions) {
			for (Iterator<String> iterator1 = definition.getIncludePatterns().iterator(); iterator1.hasNext();) {
				hasIncludes = true;
				String include = iterator1.next();
				fastMatchInfo = looksLikeStartsWith(include);
				if (fastMatchInfo != null) {
					includeStartsWith.add(fastMatchInfo);
				} else if (include.equals("*")) {
					includeStar = true;
				} else if ((fastMatchInfo = looksLikeExactName(include)) != null) {
					includeExactName.add(fastMatchInfo);
				} else {
					TypePattern includePattern = new PatternParser(include).parseTypePattern();
					includeTypePattern.add(includePattern);
				}
			}
			for (Iterator<String> iterator1 = definition.getExcludePatterns().iterator(); iterator1.hasNext();) {
				hasExcludes = true;
				String exclude = iterator1.next();
				fastMatchInfo = looksLikeStartsWith(exclude);
				if (fastMatchInfo != null) {
					excludeStartsWith.add(fastMatchInfo);
				} else if ((fastMatchInfo = looksLikeStarDotDotStarExclude(exclude)) != null) {
					excludeStarDotDotStar.add(fastMatchInfo);
				} else if ((fastMatchInfo = looksLikeExactName(exclude)) != null) {
					excludeExactName.add(exclude);
				} else if ((fastMatchInfo = looksLikeEndsWith(exclude)) != null) {
					excludeEndsWith.add(fastMatchInfo);
				} else if (exclude
						.equals("org.codehaus.groovy..* && !org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsController*")) {
					// TODO need a more sophisticated analysis here, to allow for similar situations
					excludeSpecial.add(new String[] { "org.codehaus.groovy.",
							"org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsController" });
					// for the related test:
					// } else if (exclude.equals("testdata..* && !testdata.sub.Oran*")) {
					// excludeSpecial.add(new String[] { "testdata.", "testdata.sub.Oran" });
				} else {
					TypePattern excludePattern = new PatternParser(exclude).parseTypePattern();
					excludeTypePattern.add(excludePattern);
				}
			}
		}
	}

	
Checks if the pattern looks like "*..*XXXX*" and if so returns XXXX. This will enable fast name matching of CGLIB exclusion
/**
	 * Checks if the pattern looks like "*..*XXXX*" and if so returns XXXX. This will enable fast name matching of CGLIB exclusion
	 *
	 */
	private String looksLikeStarDotDotStarExclude(String typePattern) {
		if (!typePattern.startsWith("*..*")) {
			return null;
		}
		if (!typePattern.endsWith("*")) {
			return null;
		}
		String subPattern = typePattern.substring(4, typePattern.length() - 1);
		if (hasStarDot(subPattern, 0)) {
			return null;
		}
		return subPattern.replace('$', '.');
	}

	
Checks if the pattern looks like "com.foo.Bar" - an exact name
/**
	 * Checks if the pattern looks like "com.foo.Bar" - an exact name
	 */
	private String looksLikeExactName(String typePattern) {
		if (hasSpaceAnnotationPlus(typePattern, 0) || typePattern.indexOf("*") != -1) {
			return null;
		}
		return typePattern.replace('$', '.');
	}

	
Checks if the pattern looks like "*Exception"
/**
	 * Checks if the pattern looks like "*Exception"
	 */
	private String looksLikeEndsWith(String typePattern) {
		if (typePattern.charAt(0) != '*') {
			return null;
		}
		if (hasSpaceAnnotationPlus(typePattern, 1) || hasStarDot(typePattern, 1)) {
			return null;
		}
		return typePattern.substring(1).replace('$', '.');
	}

	
Determine if something in the string is going to affect our ability to optimize. Checks for: ' ' '@' '+'
/**
	 * Determine if something in the string is going to affect our ability to optimize. Checks for: ' ' '@' '+'
	 */
	private boolean hasSpaceAnnotationPlus(String string, int pos) {
		for (int i = pos, max = string.length(); i < max; i++) {
			char ch = string.charAt(i);
			if (ch == ' ' || ch == '@' || ch == '+') {
				return true;
			}
		}
		return false;
	}

	
Determine if something in the string is going to affect our ability to optimize. Checks for: '*' '.'
/**
	 * Determine if something in the string is going to affect our ability to optimize. Checks for: '*' '.'
	 */
	private boolean hasStarDot(String string, int pos) {
		for (int i = pos, max = string.length(); i < max; i++) {
			char ch = string.charAt(i);
			if (ch == '*' || ch == '.') {
				return true;
			}
		}
		return false;
	}

	
Checks if the type pattern looks like "com.foo..*"
/**
	 * Checks if the type pattern looks like "com.foo..*"
	 */
	private String looksLikeStartsWith(String typePattern) {
		if (hasSpaceAnnotationPlus(typePattern, 0) || typePattern.charAt(typePattern.length() - 1) != '*') {
			return null;
		}
		// now must looks like with "charsss..*" or "cha.rss..*" etc
		// note that "*" and "*..*" won't be fast matched
		// and that "charsss.*" will not neither
		int length = typePattern.length();
		if (typePattern.endsWith("..*") && length > 3) {
			if (typePattern.indexOf("..") == length - 3 // no ".." before last sequence
					&& typePattern.indexOf('*') == length - 1) { // no earlier '*'
				return typePattern.substring(0, length - 2).replace('$', '.'); // "charsss." or "char.rss." etc
			}
		}
		return null;
	}

	
Register the dump filter
Params:
weaver – 
loader – 
definitions – /**
	 * Register the dump filter
	 *
	 * @param weaver
	 * @param loader
	 * @param definitions
	 */
	private void registerDump(final BcelWeaver weaver, final ClassLoader loader, final List<Definition> definitions) {
		for (Definition definition : definitions) {
			for (Iterator<String> iterator1 = definition.getDumpPatterns().iterator(); iterator1.hasNext();) {
				String dump = iterator1.next();
				TypePattern pattern = new PatternParser(dump).parseTypePattern();
				dumpTypePattern.add(pattern);
			}
			if (definition.shouldDumpBefore()) {
				dumpBefore = true;
			}
			if (definition.createDumpDirPerClassloader()) {
				dumpDirPerClassloader = true;
			}
		}
	}

	
Determine whether a type should be accepted for weaving, by checking it against any includes/excludes.
Params:
className – the name of the type to possibly accept
bytes – the bytecode for the type (in case we need to look inside, eg. annotations)
Returns:
true if it should be accepted for weaving/**
	 * Determine whether a type should be accepted for weaving, by checking it against any includes/excludes.
	 *
	 * @param className the name of the type to possibly accept
	 * @param bytes the bytecode for the type (in case we need to look inside, eg. annotations)
	 * @return true if it should be accepted for weaving
	 */
	@Override
	protected boolean accept(String className, byte[] bytes) {

		if (!hasExcludes && !hasIncludes) {
			return true;
		}

		// still try to avoid ResolvedType if we have simple patterns
		String fastClassName = className.replace('/', '.');
		for (String excludeStartsWithString : excludeStartsWith) {
			if (fastClassName.startsWith(excludeStartsWithString)) {
				return false;
			}
		}

		// Fast exclusion of patterns like: "*..*CGLIB*"
		if (!excludeStarDotDotStar.isEmpty()) {
			for (String namePiece : excludeStarDotDotStar) {
				int index = fastClassName.lastIndexOf('.');
				if (fastClassName.indexOf(namePiece, index + 1) != -1) {
					return false;
				}
			}
		}
		fastClassName = fastClassName.replace('$', '.');

		if (!excludeEndsWith.isEmpty()) {
			for (String lastPiece : excludeEndsWith) {
				if (fastClassName.endsWith(lastPiece)) {
					return false;
				}
			}
		}

		// Fast exclusion of exact names
		if (!excludeExactName.isEmpty()) {
			for (String name : excludeExactName) {
				if (fastClassName.equals(name)) {
					return false;
				}
			}
		}

		if (!excludeSpecial.isEmpty()) {
			for (String[] entry : excludeSpecial) {
				String excludeThese = entry[0];
				String exceptThese = entry[1];
				if (fastClassName.startsWith(excludeThese) && !fastClassName.startsWith(exceptThese)) {
					return false;
				}
			}
		}

		/*
		 * Bug 120363 If we have an exclude pattern that cannot be matched using "starts with" then we cannot fast accept
		 */
		boolean didSomeIncludeMatching = false;
		if (excludeTypePattern.isEmpty()) {
			if (includeStar) {
				return true;
			}
			if (!includeExactName.isEmpty()) {
				didSomeIncludeMatching = true;
				for (String exactname : includeExactName) {
					if (fastClassName.equals(exactname)) {
						return true;
					}
				}
			}
			boolean fastAccept = false;// defaults to false if no fast include
			for (int i = 0; i < includeStartsWith.size(); i++) {
				didSomeIncludeMatching = true;
				fastAccept = fastClassName.startsWith(includeStartsWith.get(i));
				if (fastAccept) {
					return true;
				}
			}
			// We may have processed all patterns now... check that and return
			if (includeTypePattern.isEmpty()) {
				return !didSomeIncludeMatching;
			}
		}

		boolean accept;
		try {
			ensureDelegateInitialized(className, bytes);

			ResolvedType classInfo = delegateForCurrentClass.getResolvedTypeX();

			// exclude are "AND"ed
			for (TypePattern typePattern : excludeTypePattern) {
				if (typePattern.matchesStatically(classInfo)) {
					// exclude match - skip
					return false;
				}
			}
			// include are "OR"ed
			if (includeStar) {
				return true;
			}
			if (!includeExactName.isEmpty()) {
				didSomeIncludeMatching = true;
				for (String exactname : includeExactName) {
					if (fastClassName.equals(exactname)) {
						return true;
					}
				}
			}
			for (int i = 0; i < includeStartsWith.size(); i++) {
				didSomeIncludeMatching = true;
				boolean fastaccept = fastClassName.startsWith(includeStartsWith.get(i));
				if (fastaccept) {
					return true;
				}
			}
			accept = !didSomeIncludeMatching; // only true if no includes at all
			for (TypePattern typePattern : includeTypePattern) {
				accept = typePattern.matchesStatically(classInfo);
				if (accept) {
					break;
				}
				// goes on if this include did not match ("OR"ed)
			}
		} finally {
			this.bcelWorld.demote();
		}
		return accept;
	}

	// FIXME we don't use include/exclude of others aop.xml
	// this can be nice but very dangerous as well to change that
	private boolean acceptAspect(String aspectClassName) {
		// avoid ResolvedType if not needed
		if (aspectExcludeTypePattern.isEmpty() && aspectIncludeTypePattern.isEmpty()) {
			return true;
		}

		// still try to avoid ResolvedType if we have simple patterns
		// EXCLUDE: if one match then reject
		String fastClassName = aspectClassName.replace('/', '.').replace('.', '$');
		for (int i = 0; i < aspectExcludeStartsWith.size(); i++) {
			if (fastClassName.startsWith(aspectExcludeStartsWith.get(i))) {
				return false;
			}
		}
		// INCLUDE: if one match then accept
		for (int i = 0; i < aspectIncludeStartsWith.size(); i++) {
			if (fastClassName.startsWith(aspectIncludeStartsWith.get(i))) {
				return true;
			}
		}

		// needs further analysis
		ResolvedType classInfo = weaver.getWorld().resolve(UnresolvedType.forName(aspectClassName), true);
		// exclude are "AND"ed
		for (TypePattern typePattern: aspectExcludeTypePattern) {
			if (typePattern.matchesStatically(classInfo)) {
				// exclude match - skip
				return false;
			}
		}
		// include are "OR"ed
		boolean accept = true;// defaults to true if no include
		for (TypePattern typePattern: aspectIncludeTypePattern) {
			accept = typePattern.matchesStatically(classInfo);
			if (accept) {
				break;
			}
			// goes on if this include did not match ("OR"ed)
		}
		return accept;
	}

	@Override
	protected boolean shouldDump(String className, boolean before) {
		// Don't dump before weaving unless asked to
		if (before && !dumpBefore) {
			return false;
		}

		// avoid ResolvedType if not needed
		if (dumpTypePattern.isEmpty()) {
			return false;
		}

		// TODO AV - optimize for className.startWith only
		ResolvedType classInfo = weaver.getWorld().resolve(UnresolvedType.forName(className), true);
		// dump
		for (Iterator<TypePattern> iterator = dumpTypePattern.iterator(); iterator.hasNext();) {
			TypePattern typePattern = iterator.next();
			if (typePattern.matchesStatically(classInfo)) {
				// dump match
				return true;
			}
		}
		return false;
	}

	@Override
	protected String getDumpDir() {
		if (dumpDirPerClassloader) {
			StringBuffer dir = new StringBuffer();
			dir.append("_ajdump").append(File.separator).append(weavingContext.getId());
			return dir.toString();
		} else {
			return super.getDumpDir();
		}
	}

	/*
	 * shared classes methods
	 */

	
Returns:
Returns the key./**
	 * @return Returns the key.
	 */
	public String getNamespace() {
		// System.out.println("ClassLoaderWeavingAdaptor.getNamespace() classloader=" + weavingContext.getClassLoaderName() +
		// ", namespace=" + namespace);
		if (namespace == null) {
			return "";
		} else {
			return new String(namespace);
		}
	}

	
Check to see if any classes are stored in the generated classes cache. Then flush the cache if it is not empty
Params:
className – TODO
Returns:
true if a class has been generated and is stored in the cache/**
	 * Check to see if any classes are stored in the generated classes cache. Then flush the cache if it is not empty
	 *
	 * @param className TODO
	 * @return true if a class has been generated and is stored in the cache
	 */
	public boolean generatedClassesExistFor(String className) {
		// System.err.println("? ClassLoaderWeavingAdaptor.generatedClassesExist() classname=" + className + ", size=" +
		// generatedClasses);
		if (className == null) {
			return !generatedClasses.isEmpty();
		} else {
			return generatedClasses.containsKey(className);
		}
	}

	
Flush the generated classes cache
/**
	 * Flush the generated classes cache
	 */
	public void flushGeneratedClasses() {
		// System.err.println("? ClassLoaderWeavingAdaptor.flushGeneratedClasses() generatedClasses=" + generatedClasses);
		generatedClasses = new HashMap<String, IUnwovenClassFile>();
	}

	
Remove generated classes based on the supplied className. This will
remove any entries related to this name - so the class itself plus
and inner classes.
Params:
className – a slashed classname (e.g. com/foo/Bar)/**
	 * Remove generated classes based on the supplied className. This will
	 * remove any entries related to this name - so the class itself plus
	 * and inner classes.
	 * @param className a slashed classname (e.g. com/foo/Bar)
	 */
	public void flushGeneratedClassesFor(String className) {
		try {
			String dottedClassName = className.replace('/', '.');
			String dottedClassNameDollar = dottedClassName+"$"; // to pickup inner classes
			Iterator<Map.Entry<String, IUnwovenClassFile>> iter = generatedClasses.entrySet().iterator();
			while (iter.hasNext()) {
				Entry<String, IUnwovenClassFile> next = iter.next();
				String existingGeneratedName = next.getKey();
				if (existingGeneratedName.equals(dottedClassName) ||
						existingGeneratedName.startsWith(dottedClassNameDollar)) {
					iter.remove();
				}
			}
		} catch (Throwable t) {
			new RuntimeException("Unexpected problem tidying up generated classes for "+className,t).printStackTrace();
		}
	}

	private Unsafe unsafe;

	private Unsafe getUnsafe() throws NoSuchFieldException, IllegalAccessException {
		if (unsafe == null) {
	        Field theUnsafeField = Unsafe.class.getDeclaredField("theUnsafe");
	        theUnsafeField.setAccessible(true);
	        return (Unsafe) theUnsafeField.get(null);
		}
		return unsafe;
    }

	private static Method bindTo_Method, invokeWithArguments_Method = null;
	private static Object defineClassMethodHandle = null;

	private static Boolean initializedForJava11 = false;

	// In order to let this code compile on earlier versions of Java (8), use reflection to discover the elements
	// we need to define classes.
	private static synchronized void initializeForJava11() {
		if (initializedForJava11) return;
		try {
			// MethodType defineClassMethodType = MethodType.methodType(Class.class, new Class[]{String.class, byte[].class, int.class, int.class, ProtectionDomain.class});
			Class<?> methodType_Class = Class.forName("java.lang.invoke.MethodType");
			Method methodTypeMethodOnMethodTypeClass = methodType_Class.getDeclaredMethod("methodType", Class.class,Class[].class);
			methodTypeMethodOnMethodTypeClass.setAccessible(true);
			Object defineClassMethodType = methodTypeMethodOnMethodTypeClass.invoke(null, Class.class, new Class[] {String.class,byte[].class,int.class,int.class,ProtectionDomain.class});

			// MethodHandles.Lookup methodHandlesLookup = MethodHandles.lookup();
			Class<?> methodHandles_Class = Class.forName("java.lang.invoke.MethodHandles");
			Method lookupMethodOnMethodHandlesClass = methodHandles_Class.getDeclaredMethod("lookup");
			lookupMethodOnMethodHandlesClass.setAccessible(true);
			Object methodHandlesLookup = lookupMethodOnMethodHandlesClass.invoke(null);

			// MethodHandles.Lookup lookup = MethodHandles.privateLookupIn(ClassLoader.class, methodHandlesLookup);
			Class<?> methodHandlesLookup_Class = Class.forName("java.lang.invoke.MethodHandles$Lookup");
			Method privateLookupMethodOnMethodHandlesClass = methodHandles_Class.getDeclaredMethod("privateLookupIn",Class.class,methodHandlesLookup_Class);
			privateLookupMethodOnMethodHandlesClass.setAccessible(true);
			Object lookup = privateLookupMethodOnMethodHandlesClass.invoke(null, ClassLoader.class, methodHandlesLookup);

			// MethodHandle defineClassMethodHandle = lookup.findVirtual(ClassLoader.class, "defineClass", defineClassMethodType);
			Method findVirtual_Method = methodHandlesLookup_Class.getDeclaredMethod("findVirtual", Class.class,String.class,methodType_Class);
			findVirtual_Method.setAccessible(true);
			defineClassMethodHandle = findVirtual_Method.invoke(lookup, ClassLoader.class, "defineClass",defineClassMethodType);

			// clazz = defineClassMethodHandle.bindTo(loader).invokeWithArguments(name, bytes, 0, bytes.length);
			Class<?> methodHandle_Class = Class.forName("java.lang.invoke.MethodHandle");
			bindTo_Method = methodHandle_Class.getDeclaredMethod("bindTo", Object.class);
			invokeWithArguments_Method = methodHandle_Class.getDeclaredMethod("invokeWithArguments",Object[].class);

			initializedForJava11 = true;
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private void defineClass(ClassLoader loader, String name, byte[] bytes, ProtectionDomain protectionDomain) {
		if (trace.isTraceEnabled()) {
			trace.enter("defineClass", this, new Object[] { loader, name, bytes });
		}
		Object clazz = null;
		debug("generating class '" + name + "'");
		if (LangUtil.is11VMOrGreater()) {
			try {
				if (!initializedForJava11) {
					initializeForJava11();
				}
				// Do this: clazz = defineClassMethodHandle.bindTo(loader).invokeWithArguments(name, bytes, 0, bytes.length, protectionDomain);
				Object o = bindTo_Method.invoke(defineClassMethodHandle,loader);
				clazz = invokeWithArguments_Method.invoke(o, new Object[] {new Object[] {name, bytes, 0, bytes.length, protectionDomain}});

			} catch (Throwable t) {
				t.printStackTrace(System.err);
				warn("define generated class failed", t);
			}
		} else {
			try {
				if (defineClassMethod == null) {
					synchronized (lock) {
						getUnsafe();
						defineClassMethod =
								Unsafe.class.getDeclaredMethod("defineClass", String.class,byte[].class,Integer.TYPE,Integer.TYPE, ClassLoader.class,ProtectionDomain.class);
					}
				}
				defineClassMethod.setAccessible(true);
				clazz = defineClassMethod.invoke(getUnsafe(), name,bytes,0,bytes.length,loader,protectionDomain);
			} catch (LinkageError le) {
				le.printStackTrace();
				// likely thrown due to defining something that already exists?
				// Old comments from before moving to Unsafe.defineClass():
				// is already defined (happens for X$ajcMightHaveAspect interfaces since aspects are reweaved)
				// TODO maw I don't think this is OK and
			} catch (Exception e) {
				e.printStackTrace(System.err);
				warn("define generated class failed", e);
			}
		}

		if (trace.isTraceEnabled()) {
			trace.exit("defineClass", clazz);
		}
	}
	static Method defineClassMethod;
	private static String lock = "lock";


//    /*
//    This method is equivalent to the following code but use reflection to compile on Java 7:
//     MethodHandles.Lookup baseLookup = MethodHandles.lookup();
//    MethodHandles.Lookup lookup = MethodHandles.privateLookupIn(ClassLoader.class, baseLookup);
//    MethodHandle defineClassMethodHandle = lookup.findVirtual(ClassLoader.class, "defineClass", defineClassMethodType);
//    handle.bindTo(classLoader).invokeWithArguments(className, classBytes, 0, classBytes.length));
// */
//@Override
//@SuppressWarnings("unchecked")
//public <T> Class<T> defineClass(ClassLoader classLoader, String className, byte[] classBytes) {
//    Object baseLookup = methodHandlesLookup.invoke(null);
//    Object lookup = methodHandlesPrivateLookupIn.invoke(null, ClassLoader.class, baseLookup);
//    MethodHandle defineClassMethodHandle = (MethodHandle) lookupFindVirtual.invoke(lookup, ClassLoader.class, "defineClass", defineClassMethodType);
//    try {
//        return Cast.uncheckedCast(defineClassMethodHandle.bindTo(classLoader).invokeWithArguments(className, classBytes, 0, classBytes.length));
//    } catch (Throwable throwable) {
//        throw new RuntimeException(throwable);
//        return (Class) defineClassMethodHandle.bindTo(classLoader).invokeWithArguments(className, classBytes, 0, classBytes.length);
//    } catch (Throwable e) {
//        throw new RuntimeException(e);
//    }
//}

	private void defineClass(ClassLoader loader, String name, byte[] bytes){
		defineClass(loader,name,bytes,null);//, ProtectionDomain protectionDomain) {
	}
//		if (trace.isTraceEnabled()) {
//			trace.enter("defineClass", this, new Object[] { loader, name, bytes, protectionDomain });
//		}
//		Object clazz = null;
//		debug("generating class '" + name + "'");
//		try {
//			getUnsafe().defineClass(name, bytes, 0, bytes.length, loader, protectionDomain);
//		} catch (LinkageError le) {
//			// likely thrown due to defining something that already exists?
//			// Old comments from before moving to Unsafe.defineClass():
//			// is already defined (happens for X$ajcMightHaveAspect interfaces since aspects are reweaved)
//			// TODO maw I don't think this is OK and
//		} catch (Exception e) {
//			warn("define generated class failed", e);
//		}
//
//		if (trace.isTraceEnabled()) {
//			trace.exit("defineClass", clazz);
//		}
//	}

}