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/*
 * $Header: /l/extreme/cvs/codes/xpp5/xis5/infoset_xpath_jaxen/org/xmlpull/infoset/xpath/jaxen/expr/DefaultPathExpr.java,v 1.1 2005/05/16 23:59:20 aslom Exp $
 * $Revision: 1.1 $
 * $Date: 2005/05/16 23:59:20 $
 *
 * ====================================================================
 *
 * Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions, and the disclaimer that follows 
 *    these conditions in the documentation and/or other materials 
 *    provided with the distribution.
 *
 * 3. The name "Jaxen" must not be used to endorse or promote products
 *    derived from this software without prior written permission.  For
 *    written permission, please contact [email protected].
 * 
 * 4. Products derived from this software may not be called "Jaxen", nor
 *    may "Jaxen" appear in their name, without prior written permission
 *    from the Jaxen Project Management ([email protected]).
 * 
 * In addition, we request (but do not require) that you include in the 
 * end-user documentation provided with the redistribution and/or in the 
 * software itself an acknowledgement equivalent to the following:
 *     "This product includes software developed by the
 *      Jaxen Project (http://www.jaxen.org/)."
 * Alternatively, the acknowledgment may be graphical using the logos 
 * available at http://www.jaxen.org/
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter  and 
 * James Strachan .  For more information on the 
 * Jaxen Project, please see .
 * 
 * $Id: DefaultPathExpr.java,v 1.1 2005/05/16 23:59:20 aslom Exp $
 */



package org.xmlpull.infoset.xpath.jaxen.expr;

import org.xmlpull.infoset.xpath.jaxen.Context;
import org.xmlpull.infoset.xpath.jaxen.JaxenException;

class DefaultPathExpr extends DefaultExpr implements PathExpr
{
    private Expr         filterExpr;
    private LocationPath locationPath;

    public DefaultPathExpr(Expr filterExpr,
                           LocationPath locationPath)
    {
        this.filterExpr   = filterExpr;
        this.locationPath = locationPath;
    }

    public Expr getFilterExpr()
    {
        return this.filterExpr;
    }

    public void setFilterExpr(Expr filterExpr)
    {
        this.filterExpr = filterExpr;
    }

    public LocationPath getLocationPath()
    {
        return this.locationPath;
    }

    public String toString()
    {
        if ( getLocationPath() != null )
        {
            return "[(DefaultPathExpr): " + getFilterExpr() + ", " + getLocationPath() + "]";
        }

        return "[(DefaultPathExpr): " + getFilterExpr() + "]";
    }

    public String getText()
    {
        StringBuffer buf = new StringBuffer();

        if ( getFilterExpr() != null )
        {
            buf.append( getFilterExpr().getText() );
        }

        if ( getLocationPath() != null )
        {
            buf.append( getLocationPath().getText() );
        }

        return buf.toString();
    }

    public Expr simplify()
    {
        if ( getFilterExpr() != null )
        {
            setFilterExpr( getFilterExpr().simplify() );
        }

        if ( getLocationPath() != null )
        {
            getLocationPath().simplify();
        }

        if ( getLocationPath() == null )
        {
            return getFilterExpr();
        }

        if ( getFilterExpr() == null )
        {
            return getLocationPath();
        }

        return this;
    }

    public Object evaluate(Context context) throws JaxenException
    {
        Object results = getFilterExpr().evaluate( context );

        context.setNodeSet( convertToList( results ) );
        
        return getLocationPath().evaluate( context );
    }
}