/**************************************************************************************
* Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the LGPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package org.codehaus.aspectwerkz.definition.expression.visitor;
import org.codehaus.aspectwerkz.definition.expression.Expression;
import org.codehaus.aspectwerkz.definition.expression.ExpressionContext;
import org.codehaus.aspectwerkz.definition.expression.PointcutType;
import org.codehaus.aspectwerkz.definition.expression.CflowExpression;
import org.codehaus.aspectwerkz.definition.expression.ExpressionNamespace;
import org.codehaus.aspectwerkz.definition.expression.ast.AndNode;
import org.codehaus.aspectwerkz.definition.expression.ast.BooleanLiteral;
import org.codehaus.aspectwerkz.definition.expression.ast.ExpressionParserVisitor;
import org.codehaus.aspectwerkz.definition.expression.ast.ExpressionScript;
import org.codehaus.aspectwerkz.definition.expression.ast.FalseNode;
import org.codehaus.aspectwerkz.definition.expression.ast.Identifier;
import org.codehaus.aspectwerkz.definition.expression.ast.NotNode;
import org.codehaus.aspectwerkz.definition.expression.ast.OrNode;
import org.codehaus.aspectwerkz.definition.expression.ast.SimpleNode;
import org.codehaus.aspectwerkz.definition.expression.ast.TrueNode;
import org.codehaus.aspectwerkz.definition.expression.ast.Anonymous;
/**
* Evaluates a cflow extracted expression given a cflow metadata stack
*
* <pre>
* stack = { m1, m2}
* true AND cf
* can return true if cf match m1 *OR* cf match m2
* (match is done on the stack)
* </pre>
*
* @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur</a>
*/
public class CflowEvaluateVisitor implements ExpressionParserVisitor {
public Object visit(SimpleNode node, Object data) {
return node.jjtGetChild(0).jjtAccept(this, data);
}
public Object visit(ExpressionScript node, Object data) {
return node.jjtGetChild(0).jjtAccept(this, data);
}
public Object visit(OrNode node, Object data) {
Boolean lhs = (Boolean)node.jjtGetChild(0).jjtAccept(this, data);
if (lhs.booleanValue()) {
return Boolean.TRUE;
}
Boolean rhs = (Boolean)node.jjtGetChild(1).jjtAccept(this, data);
return rhs;
}
public Object visit(AndNode node, Object data) {
Boolean lhs = (Boolean)node.jjtGetChild(0).jjtAccept(this, data);
if (!lhs.booleanValue()) {
return Boolean.FALSE;
}
Boolean rhs = (Boolean)node.jjtGetChild(1).jjtAccept(this, data);
return rhs;
}
public Object visit(NotNode node, Object data) {
Boolean lhs = (Boolean)node.jjtGetChild(0).jjtAccept(this, data);
if (lhs.booleanValue()) {
return Boolean.FALSE;
}
else {
return Boolean.TRUE;
}
}
public Object visit(Identifier node, Object data) {
CflowExpressionContext ctx = (CflowExpressionContext)data;
String leafName = node.name;
Expression expression = ctx.getNamespace().getExpression(leafName);
if (expression != null) {
return new Boolean(expression.matchCflow(ctx.getClassNameMethodMetaDataTuples()));
}
else {
throw new RuntimeException("no such registered expression");
}
}
public Object visit(BooleanLiteral node, Object data) {
return node.jjtGetChild(0).jjtAccept(this, data);
}
public Object visit(TrueNode node, Object data) {
return Boolean.TRUE;
}
public Object visit(FalseNode node, Object data) {
return Boolean.FALSE;
}
public Object visit(Anonymous node, Object data) {
String expr = node.name;
if (! expr.startsWith("cflow(")) {
throw new RuntimeException("inflated expression has anonymous which is not inflated: " + expr);
}
String pattern = expr.substring(6, expr.length()-1);
CflowExpressionContext ctx = (CflowExpressionContext)data;
CflowExpression cflowExpr = ctx.getNamespace().createCflowExpression(pattern, "", "");
return new Boolean(cflowExpr.matchCflow(ctx.getClassNameMethodMetaDataTuples()));
}
//------------------------
}