ExpressionVisitor.java

package org.exist.xquery;

import org.exist.xquery.functions.ExtFulltext;

/**
 * Defines a visitor to be used for traversing and analyzing the
 * expression tree.
 * 
 * @author wolf
 *
 */
public interface ExpressionVisitor {

	/**
	 * Default fallback method if no other method matches
	 * the object's type.
	 * 
	 * @param expression
	 */
	public void visit(Expression expression);
	
	/** Found a PathExpr */
	public void visitPathExpr(PathExpr expression);

    /** Found a LocationStep */
    public void visitLocationStep(LocationStep locationStep);

    public void visitFilteredExpr(FilteredExpression filtered);
    
    public void visitPredicate(Predicate predicate);

    public void visitGeneralComparison(GeneralComparison comparison);
    
    /** Found a CastExpression */
	public void visitCastExpr(CastExpression expression);

    public void visitUnionExpr(Union union);

    public void visitIntersectionExpr(Intersection intersect);
    
    public void visitAndExpr(OpAnd and);

    public void visitOrExpr(OpOr or);
    
    public void visitFtExpression(ExtFulltext fulltext);

    public void visitForExpression(ForExpr forExpr);

    public void visitLetExpression(LetExpr letExpr);

    public void visitBuiltinFunction(Function function);

    public void visitUserFunction(UserDefinedFunction function);

    public void visitConditional(ConditionalExpression conditional);

    public void visitDocumentConstructor(DocumentConstructor constructor);
    
    public void visitElementConstructor(ElementConstructor constructor);

    public void visitTextConstructor(DynamicTextConstructor constructor);

    public void visitAttribConstructor(AttributeConstructor constructor);

    public void visitAttribConstructor(DynamicAttributeConstructor constructor);

    public void visitVariableReference(VariableReference ref);
}