/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed 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.springframework.aop.aspectj;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.aspectj.weaver.patterns.NamePattern;
import org.aspectj.weaver.reflect.ReflectionWorld.ReflectionWorldException;
import org.aspectj.weaver.reflect.ShadowMatchImpl;
import org.aspectj.weaver.tools.ContextBasedMatcher;
import org.aspectj.weaver.tools.FuzzyBoolean;
import org.aspectj.weaver.tools.JoinPointMatch;
import org.aspectj.weaver.tools.MatchingContext;
import org.aspectj.weaver.tools.PointcutDesignatorHandler;
import org.aspectj.weaver.tools.PointcutExpression;
import org.aspectj.weaver.tools.PointcutParameter;
import org.aspectj.weaver.tools.PointcutParser;
import org.aspectj.weaver.tools.PointcutPrimitive;
import org.aspectj.weaver.tools.ShadowMatch;

import org.springframework.aop.ClassFilter;
import org.springframework.aop.IntroductionAwareMethodMatcher;
import org.springframework.aop.MethodMatcher;
import org.springframework.aop.ProxyMethodInvocation;
import org.springframework.aop.framework.autoproxy.ProxyCreationContext;
import org.springframework.aop.interceptor.ExposeInvocationInterceptor;
import org.springframework.aop.support.AbstractExpressionPointcut;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.annotation.BeanFactoryAnnotationUtils;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

Spring Pointcut implementation that uses the AspectJ weaver to evaluate a pointcut expression. 
The pointcut expression value is an AspectJ expression. This can
reference other pointcuts and use composition and other operations.
Naturally, as this is to be processed by Spring AOP's proxy-based model,
only method execution pointcuts are supported.
Author:
Rob Harrop, Adrian Colyer, Rod Johnson, Juergen Hoeller, Ramnivas Laddad, Dave Syer
Since:
2.0/**
 * Spring {@link org.springframework.aop.Pointcut} implementation
 * that uses the AspectJ weaver to evaluate a pointcut expression.
 *
 * <p>The pointcut expression value is an AspectJ expression. This can
 * reference other pointcuts and use composition and other operations.
 *
 * <p>Naturally, as this is to be processed by Spring AOP's proxy-based model,
 * only method execution pointcuts are supported.
 *
 * @author Rob Harrop
 * @author Adrian Colyer
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Ramnivas Laddad
 * @author Dave Syer
 * @since 2.0
 */
@SuppressWarnings("serial")
public class AspectJExpressionPointcut extends AbstractExpressionPointcut
		implements ClassFilter, IntroductionAwareMethodMatcher, BeanFactoryAware {

	private static final Set<PointcutPrimitive> SUPPORTED_PRIMITIVES = new HashSet<>();

	static {
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.EXECUTION);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.ARGS);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.REFERENCE);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.THIS);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.TARGET);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.WITHIN);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.AT_ANNOTATION);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.AT_WITHIN);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.AT_ARGS);
		SUPPORTED_PRIMITIVES.add(PointcutPrimitive.AT_TARGET);
	}


	private static final Log logger = LogFactory.getLog(AspectJExpressionPointcut.class);

	@Nullable
	private Class<?> pointcutDeclarationScope;

	private String[] pointcutParameterNames = new String[0];

	private Class<?>[] pointcutParameterTypes = new Class<?>[0];

	@Nullable
	private BeanFactory beanFactory;

	@Nullable
	private transient ClassLoader pointcutClassLoader;

	@Nullable
	private transient PointcutExpression pointcutExpression;

	private transient Map<Method, ShadowMatch> shadowMatchCache = new ConcurrentHashMap<>(32);


	
Create a new default AspectJExpressionPointcut.
/**
	 * Create a new default AspectJExpressionPointcut.
	 */
	public AspectJExpressionPointcut() {
	}

	
Create a new AspectJExpressionPointcut with the given settings.
Params:
declarationScope – the declaration scope for the pointcut
paramNames – the parameter names for the pointcut
paramTypes – the parameter types for the pointcut/**
	 * Create a new AspectJExpressionPointcut with the given settings.
	 * @param declarationScope the declaration scope for the pointcut
	 * @param paramNames the parameter names for the pointcut
	 * @param paramTypes the parameter types for the pointcut
	 */
	public AspectJExpressionPointcut(Class<?> declarationScope, String[] paramNames, Class<?>[] paramTypes) {
		this.pointcutDeclarationScope = declarationScope;
		if (paramNames.length != paramTypes.length) {
			throw new IllegalStateException(
					"Number of pointcut parameter names must match number of pointcut parameter types");
		}
		this.pointcutParameterNames = paramNames;
		this.pointcutParameterTypes = paramTypes;
	}


	
Set the declaration scope for the pointcut.
/**
	 * Set the declaration scope for the pointcut.
	 */
	public void setPointcutDeclarationScope(Class<?> pointcutDeclarationScope) {
		this.pointcutDeclarationScope = pointcutDeclarationScope;
	}

	
Set the parameter names for the pointcut.
/**
	 * Set the parameter names for the pointcut.
	 */
	public void setParameterNames(String... names) {
		this.pointcutParameterNames = names;
	}

	
Set the parameter types for the pointcut.
/**
	 * Set the parameter types for the pointcut.
	 */
	public void setParameterTypes(Class<?>... types) {
		this.pointcutParameterTypes = types;
	}

	@Override
	public void setBeanFactory(BeanFactory beanFactory) {
		this.beanFactory = beanFactory;
	}


	@Override
	public ClassFilter getClassFilter() {
		obtainPointcutExpression();
		return this;
	}

	@Override
	public MethodMatcher getMethodMatcher() {
		obtainPointcutExpression();
		return this;
	}


	
Check whether this pointcut is ready to match,
lazily building the underlying AspectJ pointcut expression.
/**
	 * Check whether this pointcut is ready to match,
	 * lazily building the underlying AspectJ pointcut expression.
	 */
	private PointcutExpression obtainPointcutExpression() {
		if (getExpression() == null) {
			throw new IllegalStateException("Must set property 'expression' before attempting to match");
		}
		if (this.pointcutExpression == null) {
			this.pointcutClassLoader = determinePointcutClassLoader();
			this.pointcutExpression = buildPointcutExpression(this.pointcutClassLoader);
		}
		return this.pointcutExpression;
	}

	
Determine the ClassLoader to use for pointcut evaluation.
/**
	 * Determine the ClassLoader to use for pointcut evaluation.
	 */
	@Nullable
	private ClassLoader determinePointcutClassLoader() {
		if (this.beanFactory instanceof ConfigurableBeanFactory) {
			return ((ConfigurableBeanFactory) this.beanFactory).getBeanClassLoader();
		}
		if (this.pointcutDeclarationScope != null) {
			return this.pointcutDeclarationScope.getClassLoader();
		}
		return ClassUtils.getDefaultClassLoader();
	}

	
Build the underlying AspectJ pointcut expression.
/**
	 * Build the underlying AspectJ pointcut expression.
	 */
	private PointcutExpression buildPointcutExpression(@Nullable ClassLoader classLoader) {
		PointcutParser parser = initializePointcutParser(classLoader);
		PointcutParameter[] pointcutParameters = new PointcutParameter[this.pointcutParameterNames.length];
		for (int i = 0; i < pointcutParameters.length; i++) {
			pointcutParameters[i] = parser.createPointcutParameter(
					this.pointcutParameterNames[i], this.pointcutParameterTypes[i]);
		}
		return parser.parsePointcutExpression(replaceBooleanOperators(resolveExpression()),
				this.pointcutDeclarationScope, pointcutParameters);
	}

	private String resolveExpression() {
		String expression = getExpression();
		Assert.state(expression != null, "No expression set");
		return expression;
	}

	
Initialize the underlying AspectJ pointcut parser.
/**
	 * Initialize the underlying AspectJ pointcut parser.
	 */
	private PointcutParser initializePointcutParser(@Nullable ClassLoader classLoader) {
		PointcutParser parser = PointcutParser
				.getPointcutParserSupportingSpecifiedPrimitivesAndUsingSpecifiedClassLoaderForResolution(
						SUPPORTED_PRIMITIVES, classLoader);
		parser.registerPointcutDesignatorHandler(new BeanPointcutDesignatorHandler());
		return parser;
	}


	
If a pointcut expression has been specified in XML, the user cannot write and as "&&" (though && will work). We also allow and between two pointcut sub-expressions. 
This method converts back to && for the AspectJ pointcut parser. /**
	 * If a pointcut expression has been specified in XML, the user cannot
	 * write {@code and} as "&&" (though &amp;&amp; will work).
	 * We also allow {@code and} between two pointcut sub-expressions.
	 * <p>This method converts back to {@code &&} for the AspectJ pointcut parser.
	 */
	private String replaceBooleanOperators(String pcExpr) {
		String result = StringUtils.replace(pcExpr, " and ", " && ");
		result = StringUtils.replace(result, " or ", " || ");
		result = StringUtils.replace(result, " not ", " ! ");
		return result;
	}


	
Return the underlying AspectJ pointcut expression.
/**
	 * Return the underlying AspectJ pointcut expression.
	 */
	public PointcutExpression getPointcutExpression() {
		return obtainPointcutExpression();
	}

	@Override
	public boolean matches(Class<?> targetClass) {
		PointcutExpression pointcutExpression = obtainPointcutExpression();
		try {
			try {
				return pointcutExpression.couldMatchJoinPointsInType(targetClass);
			}
			catch (ReflectionWorldException ex) {
				logger.debug("PointcutExpression matching rejected target class - trying fallback expression", ex);
				// Actually this is still a "maybe" - treat the pointcut as dynamic if we don't know enough yet
				PointcutExpression fallbackExpression = getFallbackPointcutExpression(targetClass);
				if (fallbackExpression != null) {
					return fallbackExpression.couldMatchJoinPointsInType(targetClass);
				}
			}
		}
		catch (Throwable ex) {
			logger.debug("PointcutExpression matching rejected target class", ex);
		}
		return false;
	}

	@Override
	public boolean matches(Method method, Class<?> targetClass, boolean hasIntroductions) {
		obtainPointcutExpression();
		ShadowMatch shadowMatch = getTargetShadowMatch(method, targetClass);

		// Special handling for this, target, @this, @target, @annotation
		// in Spring - we can optimize since we know we have exactly this class,
		// and there will never be matching subclass at runtime.
		if (shadowMatch.alwaysMatches()) {
			return true;
		}
		else if (shadowMatch.neverMatches()) {
			return false;
		}
		else {
			// the maybe case
			if (hasIntroductions) {
				return true;
			}
			// A match test returned maybe - if there are any subtype sensitive variables
			// involved in the test (this, target, at_this, at_target, at_annotation) then
			// we say this is not a match as in Spring there will never be a different
			// runtime subtype.
			RuntimeTestWalker walker = getRuntimeTestWalker(shadowMatch);
			return (!walker.testsSubtypeSensitiveVars() || walker.testTargetInstanceOfResidue(targetClass));
		}
	}

	@Override
	public boolean matches(Method method, Class<?> targetClass) {
		return matches(method, targetClass, false);
	}

	@Override
	public boolean isRuntime() {
		return obtainPointcutExpression().mayNeedDynamicTest();
	}

	@Override
	public boolean matches(Method method, Class<?> targetClass, Object... args) {
		obtainPointcutExpression();
		ShadowMatch shadowMatch = getTargetShadowMatch(method, targetClass);

		// Bind Spring AOP proxy to AspectJ "this" and Spring AOP target to AspectJ target,
		// consistent with return of MethodInvocationProceedingJoinPoint
		ProxyMethodInvocation pmi = null;
		Object targetObject = null;
		Object thisObject = null;
		try {
			MethodInvocation mi = ExposeInvocationInterceptor.currentInvocation();
			targetObject = mi.getThis();
			if (!(mi instanceof ProxyMethodInvocation)) {
				throw new IllegalStateException("MethodInvocation is not a Spring ProxyMethodInvocation: " + mi);
			}
			pmi = (ProxyMethodInvocation) mi;
			thisObject = pmi.getProxy();
		}
		catch (IllegalStateException ex) {
			// No current invocation...
			if (logger.isDebugEnabled()) {
				logger.debug("Could not access current invocation - matching with limited context: " + ex);
			}
		}

		try {
			JoinPointMatch joinPointMatch = shadowMatch.matchesJoinPoint(thisObject, targetObject, args);

			/*
			 * Do a final check to see if any this(TYPE) kind of residue match. For
			 * this purpose, we use the original method's (proxy method's) shadow to
			 * ensure that 'this' is correctly checked against. Without this check,
			 * we get incorrect match on this(TYPE) where TYPE matches the target
			 * type but not 'this' (as would be the case of JDK dynamic proxies).
			 * <p>See SPR-2979 for the original bug.
			 */
			if (pmi != null && thisObject != null) {  // there is a current invocation
				RuntimeTestWalker originalMethodResidueTest = getRuntimeTestWalker(getShadowMatch(method, method));
				if (!originalMethodResidueTest.testThisInstanceOfResidue(thisObject.getClass())) {
					return false;
				}
				if (joinPointMatch.matches()) {
					bindParameters(pmi, joinPointMatch);
				}
			}

			return joinPointMatch.matches();
		}
		catch (Throwable ex) {
			if (logger.isDebugEnabled()) {
				logger.debug("Failed to evaluate join point for arguments " + Arrays.asList(args) +
						" - falling back to non-match", ex);
			}
			return false;
		}
	}

	@Nullable
	protected String getCurrentProxiedBeanName() {
		return ProxyCreationContext.getCurrentProxiedBeanName();
	}


	
Get a new pointcut expression based on a target class's loader rather than the default.
/**
	 * Get a new pointcut expression based on a target class's loader rather than the default.
	 */
	@Nullable
	private PointcutExpression getFallbackPointcutExpression(Class<?> targetClass) {
		try {
			ClassLoader classLoader = targetClass.getClassLoader();
			if (classLoader != null && classLoader != this.pointcutClassLoader) {
				return buildPointcutExpression(classLoader);
			}
		}
		catch (Throwable ex) {
			logger.debug("Failed to create fallback PointcutExpression", ex);
		}
		return null;
	}

	private RuntimeTestWalker getRuntimeTestWalker(ShadowMatch shadowMatch) {
		if (shadowMatch instanceof DefensiveShadowMatch) {
			return new RuntimeTestWalker(((DefensiveShadowMatch) shadowMatch).primary);
		}
		return new RuntimeTestWalker(shadowMatch);
	}

	private void bindParameters(ProxyMethodInvocation invocation, JoinPointMatch jpm) {
		// Note: Can't use JoinPointMatch.getClass().getName() as the key, since
		// Spring AOP does all the matching at a join point, and then all the invocations
		// under this scenario, if we just use JoinPointMatch as the key, then
		// 'last man wins' which is not what we want at all.
		// Using the expression is guaranteed to be safe, since 2 identical expressions
		// are guaranteed to bind in exactly the same way.
		invocation.setUserAttribute(resolveExpression(), jpm);
	}

	private ShadowMatch getTargetShadowMatch(Method method, Class<?> targetClass) {
		Method targetMethod = AopUtils.getMostSpecificMethod(method, targetClass);
		if (targetMethod.getDeclaringClass().isInterface()) {
			// Try to build the most specific interface possible for inherited methods to be
			// considered for sub-interface matches as well, in particular for proxy classes.
			// Note: AspectJ is only going to take Method.getDeclaringClass() into account.
			Set<Class<?>> ifcs = ClassUtils.getAllInterfacesForClassAsSet(targetClass);
			if (ifcs.size() > 1) {
				try {
					Class<?> compositeInterface = ClassUtils.createCompositeInterface(
							ClassUtils.toClassArray(ifcs), targetClass.getClassLoader());
					targetMethod = ClassUtils.getMostSpecificMethod(targetMethod, compositeInterface);
				}
				catch (IllegalArgumentException ex) {
					// Implemented interfaces probably expose conflicting method signatures...
					// Proceed with original target method.
				}
			}
		}
		return getShadowMatch(targetMethod, method);
	}

	private ShadowMatch getShadowMatch(Method targetMethod, Method originalMethod) {
		// Avoid lock contention for known Methods through concurrent access...
		ShadowMatch shadowMatch = this.shadowMatchCache.get(targetMethod);
		if (shadowMatch == null) {
			synchronized (this.shadowMatchCache) {
				// Not found - now check again with full lock...
				PointcutExpression fallbackExpression = null;
				shadowMatch = this.shadowMatchCache.get(targetMethod);
				if (shadowMatch == null) {
					Method methodToMatch = targetMethod;
					try {
						try {
							shadowMatch = obtainPointcutExpression().matchesMethodExecution(methodToMatch);
						}
						catch (ReflectionWorldException ex) {
							// Failed to introspect target method, probably because it has been loaded
							// in a special ClassLoader. Let's try the declaring ClassLoader instead...
							try {
								fallbackExpression = getFallbackPointcutExpression(methodToMatch.getDeclaringClass());
								if (fallbackExpression != null) {
									shadowMatch = fallbackExpression.matchesMethodExecution(methodToMatch);
								}
							}
							catch (ReflectionWorldException ex2) {
								fallbackExpression = null;
							}
						}
						if (targetMethod != originalMethod && (shadowMatch == null ||
								(shadowMatch.neverMatches() && Proxy.isProxyClass(targetMethod.getDeclaringClass())))) {
							// Fall back to the plain original method in case of no resolvable match or a
							// negative match on a proxy class (which doesn't carry any annotations on its
							// redeclared methods).
							methodToMatch = originalMethod;
							try {
								shadowMatch = obtainPointcutExpression().matchesMethodExecution(methodToMatch);
							}
							catch (ReflectionWorldException ex) {
								// Could neither introspect the target class nor the proxy class ->
								// let's try the original method's declaring class before we give up...
								try {
									fallbackExpression = getFallbackPointcutExpression(methodToMatch.getDeclaringClass());
									if (fallbackExpression != null) {
										shadowMatch = fallbackExpression.matchesMethodExecution(methodToMatch);
									}
								}
								catch (ReflectionWorldException ex2) {
									fallbackExpression = null;
								}
							}
						}
					}
					catch (Throwable ex) {
						// Possibly AspectJ 1.8.10 encountering an invalid signature
						logger.debug("PointcutExpression matching rejected target method", ex);
						fallbackExpression = null;
					}
					if (shadowMatch == null) {
						shadowMatch = new ShadowMatchImpl(org.aspectj.util.FuzzyBoolean.NO, null, null, null);
					}
					else if (shadowMatch.maybeMatches() && fallbackExpression != null) {
						shadowMatch = new DefensiveShadowMatch(shadowMatch,
								fallbackExpression.matchesMethodExecution(methodToMatch));
					}
					this.shadowMatchCache.put(targetMethod, shadowMatch);
				}
			}
		}
		return shadowMatch;
	}


	@Override
	public boolean equals(Object other) {
		if (this == other) {
			return true;
		}
		if (!(other instanceof AspectJExpressionPointcut)) {
			return false;
		}
		AspectJExpressionPointcut otherPc = (AspectJExpressionPointcut) other;
		return ObjectUtils.nullSafeEquals(this.getExpression(), otherPc.getExpression()) &&
				ObjectUtils.nullSafeEquals(this.pointcutDeclarationScope, otherPc.pointcutDeclarationScope) &&
				ObjectUtils.nullSafeEquals(this.pointcutParameterNames, otherPc.pointcutParameterNames) &&
				ObjectUtils.nullSafeEquals(this.pointcutParameterTypes, otherPc.pointcutParameterTypes);
	}

	@Override
	public int hashCode() {
		int hashCode = ObjectUtils.nullSafeHashCode(this.getExpression());
		hashCode = 31 * hashCode + ObjectUtils.nullSafeHashCode(this.pointcutDeclarationScope);
		hashCode = 31 * hashCode + ObjectUtils.nullSafeHashCode(this.pointcutParameterNames);
		hashCode = 31 * hashCode + ObjectUtils.nullSafeHashCode(this.pointcutParameterTypes);
		return hashCode;
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		sb.append("AspectJExpressionPointcut: ");
		sb.append("(");
		for (int i = 0; i < this.pointcutParameterTypes.length; i++) {
			sb.append(this.pointcutParameterTypes[i].getName());
			sb.append(" ");
			sb.append(this.pointcutParameterNames[i]);
			if ((i+1) < this.pointcutParameterTypes.length) {
				sb.append(", ");
			}
		}
		sb.append(")");
		sb.append(" ");
		if (getExpression() != null) {
			sb.append(getExpression());
		}
		else {
			sb.append("<pointcut expression not set>");
		}
		return sb.toString();
	}

	//---------------------------------------------------------------------
	// Serialization support
	//---------------------------------------------------------------------

	private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
		// Rely on default serialization, just initialize state after deserialization.
		ois.defaultReadObject();

		// Initialize transient fields.
		// pointcutExpression will be initialized lazily by checkReadyToMatch()
		this.shadowMatchCache = new ConcurrentHashMap<>(32);
	}


	
Handler for the Spring-specific bean() pointcut designator extension to AspectJ. 
This handler must be added to each pointcut object that needs to handle the bean() PCD. Matching context is obtained automatically by examining a thread local variable and therefore a matching context need not be set on the pointcut. /**
	 * Handler for the Spring-specific {@code bean()} pointcut designator
	 * extension to AspectJ.
	 * <p>This handler must be added to each pointcut object that needs to
	 * handle the {@code bean()} PCD. Matching context is obtained
	 * automatically by examining a thread local variable and therefore a matching
	 * context need not be set on the pointcut.
	 */
	private class BeanPointcutDesignatorHandler implements PointcutDesignatorHandler {

		private static final String BEAN_DESIGNATOR_NAME = "bean";

		@Override
		public String getDesignatorName() {
			return BEAN_DESIGNATOR_NAME;
		}

		@Override
		public ContextBasedMatcher parse(String expression) {
			return new BeanContextMatcher(expression);
		}
	}


	
Matcher class for the BeanNamePointcutDesignatorHandler.
Dynamic match tests for this matcher always return true,
since the matching decision is made at the proxy creation time.
For static match tests, this matcher abstains to allow the overall
pointcut to match even when negation is used with the bean() pointcut.
/**
	 * Matcher class for the BeanNamePointcutDesignatorHandler.
	 * <p>Dynamic match tests for this matcher always return true,
	 * since the matching decision is made at the proxy creation time.
	 * For static match tests, this matcher abstains to allow the overall
	 * pointcut to match even when negation is used with the bean() pointcut.
	 */
	private class BeanContextMatcher implements ContextBasedMatcher {

		private final NamePattern expressionPattern;

		public BeanContextMatcher(String expression) {
			this.expressionPattern = new NamePattern(expression);
		}

		@Override
		@SuppressWarnings("rawtypes")
		@Deprecated
		public boolean couldMatchJoinPointsInType(Class someClass) {
			return (contextMatch(someClass) == FuzzyBoolean.YES);
		}

		@Override
		@SuppressWarnings("rawtypes")
		@Deprecated
		public boolean couldMatchJoinPointsInType(Class someClass, MatchingContext context) {
			return (contextMatch(someClass) == FuzzyBoolean.YES);
		}

		@Override
		public boolean matchesDynamically(MatchingContext context) {
			return true;
		}

		@Override
		public FuzzyBoolean matchesStatically(MatchingContext context) {
			return contextMatch(null);
		}

		@Override
		public boolean mayNeedDynamicTest() {
			return false;
		}

		private FuzzyBoolean contextMatch(@Nullable Class<?> targetType) {
			String advisedBeanName = getCurrentProxiedBeanName();
			if (advisedBeanName == null) {  // no proxy creation in progress
				// abstain; can't return YES, since that will make pointcut with negation fail
				return FuzzyBoolean.MAYBE;
			}
			if (BeanFactoryUtils.isGeneratedBeanName(advisedBeanName)) {
				return FuzzyBoolean.NO;
			}
			if (targetType != null) {
				boolean isFactory = FactoryBean.class.isAssignableFrom(targetType);
				return FuzzyBoolean.fromBoolean(
						matchesBean(isFactory ? BeanFactory.FACTORY_BEAN_PREFIX + advisedBeanName : advisedBeanName));
			}
			else {
				return FuzzyBoolean.fromBoolean(matchesBean(advisedBeanName) ||
						matchesBean(BeanFactory.FACTORY_BEAN_PREFIX + advisedBeanName));
			}
		}

		private boolean matchesBean(String advisedBeanName) {
			return BeanFactoryAnnotationUtils.isQualifierMatch(
					this.expressionPattern::matches, advisedBeanName, beanFactory);
		}
	}


	private static class DefensiveShadowMatch implements ShadowMatch {

		private final ShadowMatch primary;

		private final ShadowMatch other;

		public DefensiveShadowMatch(ShadowMatch primary, ShadowMatch other) {
			this.primary = primary;
			this.other = other;
		}

		@Override
		public boolean alwaysMatches() {
			return this.primary.alwaysMatches();
		}

		@Override
		public boolean maybeMatches() {
			return this.primary.maybeMatches();
		}

		@Override
		public boolean neverMatches() {
			return this.primary.neverMatches();
		}

		@Override
		public JoinPointMatch matchesJoinPoint(Object thisObject, Object targetObject, Object[] args) {
			try {
				return this.primary.matchesJoinPoint(thisObject, targetObject, args);
			}
			catch (ReflectionWorldException ex) {
				return this.other.matchesJoinPoint(thisObject, targetObject, args);
			}
		}

		@Override
		public void setMatchingContext(MatchingContext aMatchContext) {
			this.primary.setMatchingContext(aMatchContext);
			this.other.setMatchingContext(aMatchContext);
		}
	}

}