// $Id: ExprContext.java,v 1.1 2002/04/25 18:06:37 bill Exp $

package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

import com.jclark.xsl.sax.SaxFilterMaker;

import java.net.URL;
import java.util.Hashtable;

/**
 * packages up the context available to the XSLT engine
 * when evaluating XPath expressions
 */
public interface ExprContext 
{

    int getPosition() throws XSLException;

     int getLastPosition() throws XSLException;

    /**
     * access to the stylesheet's global variables
     */
     Variant getGlobalVariableValue(Name name) throws XSLException;

    /**
     * access to the stylesheet's in-scope local variables
     */
     Variant getLocalVariableValue(Name name) throws XSLException;

    /**
     *
     */
     ExtensionContext getExtensionContext(String namespace)
	throws XSLException;

    /**
     * provides access to the system properties for the 
     * system-property() function in XSLT 1.0 section 12.4
     */
     Variant getSystemProperty(Name name);

    /**
     *
     */
     Node getCurrent(Node contextNode);

    /**
     * returns a parsed representation of the document at the given
     * URL. ... enables  the "document()" function of XSLT 1.0 section 12.1
     */
     NodeIterator getDocument(URL baseURL, String uriRef) throws XSLException;

    /**
     *  @return the indexed nodes for the named key in the node's document
     */
     KeyValuesTable getKeyValuesTable(Name keyName, Node n);

    /**
     *
     */
     Node getTree(Variant v) throws XSLException;

}