/*
* $Header$
* $Revision: 1345 $
* $Date: 2009-10-22 07:25:23 -0400 (Thu, 22 Oct 2009) $
*
* ====================================================================
*
* Copyright 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of the Jaxen Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS 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 COPYRIGHT OWNER
* OR 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 1345 2009-10-22 11:25:23Z 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);
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 || nodeSet.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;
}
}