/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.aop.pointcut;
import org.jboss.aop.instrument.Untransformable;
import org.jboss.aop.pointcut.ast.ASTConstructor;
import org.jboss.aop.pointcut.ast.ASTExecution;
import org.jboss.aop.pointcut.ast.ASTMethod;
import org.jboss.aop.pointcut.ast.ClassExpression;
import org.jboss.aop.pointcut.ast.ParseException;
import org.jboss.aop.pointcut.ast.PointcutExpressionParser;
import org.jboss.aop.pointcut.ast.SimpleNode;
import java.io.StringReader;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 70842 $
*
**/
public class CFlow
{
public static int NOT_FOUND = -2;
private String original;
private SimpleNode point;
private boolean not;
public CFlow(String expr, boolean not)
{
original = expr;
expr = "execution(" + expr + ")";
ASTExecution exc = null;
try
{
exc = new PointcutExpressionParser(new StringReader(expr)).execution();
}
catch (ParseException e)
{
throw new RuntimeException("Illegal cflow expression: " + original, e);
}
point = (SimpleNode) exc.jjtGetChild(0);
this.not = not;
}
public int matches(StackTraceElement[] stack, int index)
{
int found = NOT_FOUND;
if (point instanceof ASTMethod)
{
found = matches((ASTMethod) point, stack, index);
}
else
{
found = matches((ASTConstructor) point, stack, index);
}
if ((found == NOT_FOUND) && not) return index;
if (found > NOT_FOUND && not) return NOT_FOUND;
return found;
}
private int matches(ASTMethod method, StackTraceElement[] stack, int index)
{
for (int i = index; i >= 0; i--)
{
ClassExpression expr = method.getClazz();
if (!matchesClass(expr, stack[i])) continue;
if (method.getMethodIdentifier().matches(stack[i].getMethodName()))
{
return i - 1;
}
}
return -2;
}
private int matches(ASTConstructor con, StackTraceElement[] stack, int index)
{
for (int i = index; i >= 0; i--)
{
ClassExpression expr = con.getClazz();
if (!matchesClass(expr, stack[i])) continue;
if (stack[i].getMethodName().equals("<init>"))
{
return i - 1; // match
}
}
return -2;
}
private boolean matchesClass(ClassExpression expr, StackTraceElement element)
{
if (expr.isSimple())
{
if (!expr.matches(element.getClassName()))
{
return false;
}
}
else
{
// FIXME ClassLoader - why should the class be visible from the context classloader?
Class<?> clazz = loadClass(element.getClassName());
if (Untransformable.class.isAssignableFrom(clazz))
{
//Invocation classes should not be checked (they are not in the cache at runtime)
return false;
}
if (!Util.matchesClassExpr(expr, clazz))
{
return false;
}
}
return true;
}
private Class<?> loadClass(String name)
{
return SecurityActions.loadClass(name);
}
}