/*
* eXist Open Source Native XML Database
* Copyright (C) 2000-2009 The eXist team
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id$
*/
package org.exist.xquery.functions;
import org.exist.dom.QName;
import org.exist.xquery.Cardinality;
import org.exist.xquery.Dependency;
import org.exist.xquery.Function;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.Profiler;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.IntegerValue;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.Type;
/**
* Built-in function fn:last().
*
* @author wolf
*/
public class FunLast extends Function {
public final static FunctionSignature signature =
new FunctionSignature(
new QName("last", Function.BUILTIN_FUNCTION_NS),
"Returns the context size from the dynamic context. " +
"If the context item is undefined, an error is raised.",
null,
new FunctionReturnSequenceType(Type.INTEGER, Cardinality.ZERO_OR_ONE, "the context size from the dynamic context"));
public FunLast(XQueryContext context) {
super(context, signature);
}
/* (non-Javadoc)
* @see org.exist.xquery.functions.Function#getDependencies()
*/
public int getDependencies() {
if (inPredicate)
return Dependency.CONTEXT_SET;
else
return Dependency.CONTEXT_SET +
Dependency.CONTEXT_POSITION;
}
/* (non-Javadoc)
* @see org.exist.xquery.functions.Function#eval(org.exist.xquery.StaticContext, org.exist.dom.DocumentSet, org.exist.xquery.value.Sequence, org.exist.xquery.value.Item)
*/
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
if (context.getProfiler().isEnabled()) {
context.getProfiler().start(this);
context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
if (contextSequence != null)
context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);
if (contextItem != null)
context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());
}
Sequence result;
if (contextSequence == null)
throw new XPathException(this, "FONC0001: undefined context item");
else if (contextSequence.isEmpty())
result = Sequence.EMPTY_SEQUENCE;
else
result = new IntegerValue(contextSequence.getItemCount());
if (context.getProfiler().isEnabled())
context.getProfiler().end(this, "", result);
return result;
}
/*public Sequence eval(StaticContext context, DocumentSet docs, Sequence contextSequence,
Item contextItem) throws XPathException {
if(!Type.subTypeOf(contextItem.getType(), Type.NODE))
throw new XPathException(this, "last() can only be applied to nodes");
NodeProxy contextNode = (NodeProxy)contextItem;
DocumentImpl doc = contextNode.getDoc();
int level = doc.getTreeLevel(contextNode.getGID());
long pid = (contextNode.getGID() - doc.getLevelStartPoint(level)) /
doc.getTreeLevelOrder(level)
+ doc.getLevelStartPoint(level - 1);
long f_gid = (pid - doc.getLevelStartPoint(level -1)) *
doc.getTreeLevelOrder(level) +
doc.getLevelStartPoint(level);
long e_gid = f_gid + doc.getTreeLevelOrder(level);
NodeSet set = ((NodeSet)contextSequence).getRange(doc, f_gid, e_gid);
int len = set.getLength();
return new IntegerValue(len);
}*/
}