/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2001-07 The eXist Project
 *  http://exist-db.org
 *
 *  This program 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
 *  of the License, or (at your option) any later version.
 *
 *  This program 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 library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * \$Id\$
 */

package org.exist.xquery;

import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.Item;
import org.exist.xquery.util.ExpressionDumper;
import org.exist.xquery.parser.XQueryAST;
import org.exist.dom.DocumentSet;
import org.exist.security.xacml.XACMLSource;

public class DebuggableExpression implements Expression {

    private Expression expression;

    protected int line = -1;
    protected int column = -1;
    
    public DebuggableExpression(Expression expression) {
        this.expression = expression;
        this.line = expression.getLine();
        this.column = expression.getColumn();
    }

    public int getExpressionId() {
        return expression.getExpressionId();
    }

    public void analyze(AnalyzeContextInfo contextInfo) throws XPathException {
        expression.analyze(contextInfo);
    }

    public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
        try {
            expression.getContext().expressionStart(expression);
            return expression.eval(contextSequence, contextItem);
        } finally {
            expression.getContext().expressionEnd(expression);
        }
    }

    public Sequence eval(Sequence contextSequence) throws XPathException {
        return eval(contextSequence, null);
    }

    public void setPrimaryAxis(int axis) {
        expression.setPrimaryAxis(axis);
    }

    public int getPrimaryAxis() {
        return expression.getPrimaryAxis();
    }

    public int returnsType() {
        return expression.returnsType();
    }

    public int getCardinality() {
        return expression.getCardinality();
    }

    public int getDependencies() {
        return expression.getDependencies();
    }

    public void resetState(boolean postOptimization) {
        expression.resetState(postOptimization);
    }

    public void accept(ExpressionVisitor visitor) {
        expression.accept(visitor);
    }

    public void dump(ExpressionDumper dumper) {
        expression.dump(dumper);
    }

    public void setContextDocSet(DocumentSet contextSet) {
        expression.setContextDocSet(contextSet);
    }

    public int getContextId() {
        return expression.getContextId();
    }

    public DocumentSet getContextDocSet() {
        return expression.getContextDocSet();
    }

   public void setASTNode(XQueryAST ast) {
        if (ast != null) {
            line = ast.getLine();
            column = ast.getColumn();
        }
	}

    public void setLocation(int line, int column) {
        this.line = line;
        this.column = column;
    }

    public int getLine() {
        return line;
    }

    public int getColumn() {
        return column;
    }

    public XQueryContext getContext() {
        return expression.getContext();
    }

    public XACMLSource getSource() {
        return expression.getSource();
    }
}