/*
* $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/PredicateSet.java,v 1.22 2006/05/03 16:07:02 elharo Exp $
* $Revision: 1.22 $
* $Date: 2006/05/03 16:07:02 $
*
* ====================================================================
*
* 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: PredicateSet.java,v 1.22 2006/05/03 16:07:02 elharo Exp $
*/
package org.orbeon.jaxen.expr;
import org.orbeon.jaxen.Context;
import org.orbeon.jaxen.ContextSupport;
import org.orbeon.jaxen.JaxenException;
import org.orbeon.jaxen.function.BooleanFunction;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
public class PredicateSet implements Serializable
{
/**
*
*/
private static final long serialVersionUID = -7166491740228977853L;
private List predicates;
public PredicateSet()
{
this.predicates = Collections.EMPTY_LIST;
}
public void addPredicate(Predicate predicate)
{
if ( this.predicates == Collections.EMPTY_LIST )
{
this.predicates = new ArrayList();
}
this.predicates.add( predicate );
}
public List getPredicates()
{
return this.predicates;
}
public void simplify()
{
Iterator predIter = this.predicates.iterator();
Predicate eachPred = null;
while ( predIter.hasNext() )
{
eachPred = (Predicate) predIter.next();
eachPred.simplify();
}
}
public String getText()
{
StringBuffer buf = new StringBuffer();
Iterator predIter = this.predicates.iterator();
Predicate eachPred = null;
while ( predIter.hasNext() )
{
eachPred = (Predicate) predIter.next();
buf.append( eachPred.getText() );
}
return buf.toString();
}
protected boolean evaluateAsBoolean(List contextNodeSet,
ContextSupport support) throws JaxenException
{
return anyMatchingNode( contextNodeSet, support );
}
private boolean anyMatchingNode(List contextNodeSet, ContextSupport support)
throws JaxenException {
// Easy way out (necessary)
if (predicates.size() == 0) {
return false;
}
Iterator predIter = predicates.iterator();
// initial list to filter
List nodes2Filter = contextNodeSet;
// apply all predicates
while(predIter.hasNext()) {
final int nodes2FilterSize = nodes2Filter.size();
// Set up a dummy context with a list to hold each node
Context predContext = new Context(support);
List tempList = new ArrayList(1);
predContext.setNodeSet(tempList);
// loop through the current nodes to filter and add to the
// filtered nodes list if the predicate succeeds
for (int i = 0; i < nodes2FilterSize; ++i) {
Object contextNode = nodes2Filter.get(i);
tempList.clear();
tempList.add(contextNode);
predContext.setNodeSet(tempList);
// ????
predContext.setPosition(i + 1);
predContext.setSize(nodes2FilterSize);
Object predResult = ((Predicate)predIter.next()).evaluate(predContext);
if (predResult instanceof Number) {
// Here we assume nodes are in forward or reverse order
// as appropriate for axis
int proximity = ((Number) predResult).intValue();
if (proximity == (i + 1)) {
return true;
}
}
else {
Boolean includes =
BooleanFunction.evaluate(predResult,
predContext.getNavigator());
if (includes.booleanValue()) {
return true;
}
}
}
}
return false;
}
protected List evaluatePredicates(List contextNodeSet, ContextSupport support)
throws JaxenException {
// Easy way out (necessary)
if (predicates.size() == 0) {
return contextNodeSet;
}
Iterator predIter = predicates.iterator();
// initial list to filter
List nodes2Filter = contextNodeSet;
// apply all predicates
while(predIter.hasNext()) {
nodes2Filter =
applyPredicate((Predicate)predIter.next(), nodes2Filter, support);
}
return nodes2Filter;
}
public List applyPredicate(Predicate predicate, List nodes2Filter, ContextSupport support)
throws JaxenException {
final int nodes2FilterSize = nodes2Filter.size();
List filteredNodes = new ArrayList(nodes2FilterSize);
// Set up a dummy context with a list to hold each node
Context predContext = new Context(support);
List tempList = new ArrayList(1);
predContext.setNodeSet(tempList);
// loop through the current nodes to filter and add to the
// filtered nodes list if the predicate succeeds
for (int i = 0; i < nodes2FilterSize; ++i) {
Object contextNode = nodes2Filter.get(i);
tempList.clear();
tempList.add(contextNode);
predContext.setNodeSet(tempList);
// ????
predContext.setPosition(i + 1);
predContext.setSize(nodes2FilterSize);
Object predResult = predicate.evaluate(predContext);
if (predResult instanceof Number) {
// Here we assume nodes are in forward or reverse order
// as appropriate for axis
int proximity = ((Number) predResult).intValue();
if (proximity == (i + 1)) {
filteredNodes.add(contextNode);
}
}
else {
Boolean includes =
BooleanFunction.evaluate(predResult,
predContext.getNavigator());
if (includes.booleanValue()) {
filteredNodes.add(contextNode);
}
}
}
return filteredNodes;
}
}