/*
* $Header: /cvsroot/jaxen/jaxen/src/java/main/org/jaxen/expr/DefaultStep.java,v 1.8 2003/06/29 18:05:40 ssanders Exp $
* $Revision: 1.8 $
* $Date: 2003/06/29 18:05:40 $
*
* ====================================================================
*
* 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: DefaultStep.java,v 1.8 2003/06/29 18:05:40 ssanders Exp $
*/
package org.jaxen.expr;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.jaxen.Context;
import org.jaxen.ContextSupport;
import org.jaxen.JaxenException;
import org.jaxen.UnsupportedAxisException;
import org.jaxen.expr.iter.IterableAxis;
import org.jaxen.saxpath.Axis;
import org.jaxen.util.IdentityHashMap;
public abstract class DefaultStep implements Step
{
private IterableAxis axis;
private PredicateSet predicates;
private final static Object PRESENT = new Object();
public DefaultStep(IterableAxis axis, PredicateSet predicates)
{
this.axis = axis;
this.predicates = predicates;
}
public void addPredicate(Predicate predicate)
{
this.predicates.addPredicate(predicate);
}
public List getPredicates()
{
return this.predicates.getPredicates();
}
public PredicateSet getPredicateSet()
{
return this.predicates;
}
public int getAxis()
{
return this.axis.value();
}
public IterableAxis getIterableAxis()
{
return this.axis;
}
public String getAxisName()
{
return Axis.lookup(getAxis());
}
public String getText()
{
return this.predicates.getText();
}
public String toString()
{
return getIterableAxis() + " " + super.toString();
}
public void simplify()
{
this.predicates.simplify();
}
public Iterator axisIterator(Object contextNode, ContextSupport support)
throws UnsupportedAxisException
{
return getIterableAxis().iterator(contextNode, support);
}
public List evaluate(Context context) throws JaxenException
{
List contextNodeSet = context.getNodeSet();
Map unique = new IdentityHashMap();
int contextSize = contextNodeSet.size();
List interimSet = new ArrayList();
List newNodeSet = new ArrayList();
Object eachContextNode = null;
INNER:
for ( int i = 0 ; i < contextSize ; ++i )
{
eachContextNode = contextNodeSet.get( i );
Iterator axisNodeIter = axisIterator( eachContextNode,
context.getContextSupport() );
if ( axisNodeIter == null )
{
continue INNER;
}
Object eachAxisNode = null;
while ( axisNodeIter.hasNext() )
{
eachAxisNode = axisNodeIter.next();
if ( matches( eachAxisNode,
context.getContextSupport() ) )
{
if ( ! unique.containsKey( eachAxisNode ) )
{
unique.put( eachAxisNode, PRESENT );
interimSet.add( eachAxisNode );
}
}
}
newNodeSet.addAll(getPredicateSet().evaluatePredicates(
interimSet,context.getContextSupport() ));
interimSet.clear();
}
return newNodeSet;
}
}