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* $Header: /cvsroot/xena/xena/src/org/jaxen/expr/DefaultStep.java,v 1.2 2009/12/10 03:18:13 matthewoliver Exp $
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* $Date: 2009/12/10 03:18:13 $
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* ====================================================================
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* Copyright 2000-2002 bob mcwhirter & James Strachan.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the Jaxen Project nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Jaxen Project and was originally
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* created by bob mcwhirter <bob@werken.com> and
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* James Strachan <jstrachan@apache.org>. For more information on the
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* Jaxen Project, please see <http://www.jaxen.org/>.
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* $Id: DefaultStep.java,v 1.2 2009/12/10 03:18:13 matthewoliver Exp $
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package org.jaxen.expr;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import org.jaxen.Context;
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import org.jaxen.ContextSupport;
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import org.jaxen.JaxenException;
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import org.jaxen.UnsupportedAxisException;
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import org.jaxen.expr.iter.IterableAxis;
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import org.jaxen.saxpath.Axis;
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* @deprecated this class will become non-public in the future;
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* use the interface instead
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public abstract class DefaultStep implements Step
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private IterableAxis axis;
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private PredicateSet predicates;
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public DefaultStep(IterableAxis axis, PredicateSet predicates)
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this.predicates = predicates;
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public void addPredicate(Predicate predicate)
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this.predicates.addPredicate(predicate);
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public List getPredicates()
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return this.predicates.getPredicates();
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public PredicateSet getPredicateSet()
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return this.predicates;
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return this.axis.value();
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public IterableAxis getIterableAxis()
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public String getAxisName()
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return Axis.lookup(getAxis());
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public String getText()
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return this.predicates.getText();
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public String toString()
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return getIterableAxis() + " " + super.toString();
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public void simplify()
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this.predicates.simplify();
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public Iterator axisIterator(Object contextNode, ContextSupport support)
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throws UnsupportedAxisException
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return getIterableAxis().iterator(contextNode, support);
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public List evaluate(final Context context) throws JaxenException
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final List contextNodeSet = context.getNodeSet();
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final IdentitySet unique = new IdentitySet();
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final int contextSize = contextNodeSet.size();
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// ???? try linked lists instead?
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// ???? initial size for these?
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final ArrayList interimSet = new ArrayList();
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final ArrayList newNodeSet = new ArrayList();
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final ContextSupport support = context.getContextSupport();
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// ???? use iterator instead
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for ( int i = 0 ; i < contextSize ; ++i )
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Object eachContextNode = contextNodeSet.get( i );
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/* See jaxen-106. Might be able to optimize this by doing
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* specific matching for individual axes. For instance on namespace axis
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* we should only get namespace nodes and on attribute axes we only get
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* attribute nodes. Self and parent axes have single members.
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* Children, descendant, ancestor, and sibling axes never
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* see any attributes or namespaces
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Iterator axisNodeIter = axis.iterator(eachContextNode, support);
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while ( axisNodeIter.hasNext() )
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Object eachAxisNode = axisNodeIter.next();
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if ( ! unique.contains( eachAxisNode ) )
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if ( matches( eachAxisNode, support ) )
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unique.add( eachAxisNode );
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interimSet.add( eachAxisNode );
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newNodeSet.addAll(getPredicateSet().evaluatePredicates(
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interimSet, support ));