/*
 * $Header$
 * $Revision: 983 $
 * $Date: 2005-06-28 06:44:46 -0700 (Tue, 28 Jun 2005) $
 *
 * ====================================================================
 *
 * 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 license@jaxen.org.
 *
 * 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 (pm@jaxen.org).
 *
 * 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 <bob@werken.com> and
 * James Strachan <jstrachan@apache.org>.  For more information on the
 * Jaxen Project, please see <http://www.jaxen.org/>.
 *
 * $Id: DefaultLocationPath.java 983 2005-06-28 13:44:46Z elharo $
 */
package org.jaxen.expr;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.jaxen.Context;
import org.jaxen.ContextSupport;
import org.jaxen.JaxenException;

abstract class DefaultLocationPath extends DefaultExpr implements LocationPath
{
    private List steps;
    
    /**
     * Create a new empty location path.
     */
    DefaultLocationPath()
    {
        this.steps = new LinkedList();
    }

    public void addStep(Step step)
    {
        getSteps().add(step);
    }

    public List getSteps()
    {
        return this.steps;
    }

    public Expr simplify()
    {
        Iterator stepIter = getSteps().iterator();
        Step eachStep = null;
        while (stepIter.hasNext())
        {
            eachStep = (Step) stepIter.next();
            eachStep.simplify();
        }
        return this;
    }

    public String getText()
    {
        StringBuffer buf = new StringBuffer();
        Iterator stepIter = getSteps().iterator();
        while (stepIter.hasNext())
        {
            buf.append(((Step) stepIter.next()).getText());
            if (stepIter.hasNext())
            {
                buf.append("/");
            }
        }
        return buf.toString();
    }

    public String toString()
    {
        StringBuffer buf = new StringBuffer();
        Iterator stepIter = getSteps().iterator();
        while (stepIter.hasNext())
        {
            buf.append(stepIter.next().toString());
            if (stepIter.hasNext())
            {
                buf.append("/");
            }
        }
        return buf.toString();
    }

    public boolean isAbsolute()
    {
        return false;
    }

    public Object evaluate(Context context) throws JaxenException
    {
        List nodeSet = context.getNodeSet();
        List contextNodeSet = new ArrayList(nodeSet.size());
        contextNodeSet.addAll(nodeSet);
        ContextSupport support = context.getContextSupport();
        Context stepContext = new Context(support);
        Iterator stepIter = getSteps().iterator();
        while ( stepIter.hasNext() )
        {
            Step eachStep = (Step) stepIter.next();
            stepContext.setNodeSet(contextNodeSet);
            contextNodeSet = eachStep.evaluate(stepContext);
            // now we need to reverse the list if this is a reverse axis
            if (isReverseAxis(eachStep)) {
                Collections.reverse(contextNodeSet);
            }
        }
        
        if (getSteps().size() > 1) {
            Collections.sort(contextNodeSet, new NodeComparator(support.getNavigator()));
        }
        
        return contextNodeSet;
    }

    private boolean isReverseAxis(Step step) {

        int axis = step.getAxis();
        return axis == org.jaxen.saxpath.Axis.PRECEDING
          || axis == org.jaxen.saxpath.Axis.PRECEDING_SIBLING
          || axis == org.jaxen.saxpath.Axis.ANCESTOR
          || axis == org.jaxen.saxpath.Axis.ANCESTOR_OR_SELF;
    }

}


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