/*
* @(#)$Id: SelfStep.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.expr.path.axis;
import xbird.xquery.DynamicError;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.*;
import xbird.xquery.dm.value.sequence.*;
import xbird.xquery.expr.path.NodeTest;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.meta.IFocus;
/**
* The self axis contains just the context node itself.
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class SelfStep extends AxisStep {
private static final long serialVersionUID = -5466293225938504391L;
public SelfStep(NodeTest test) {
super(SELF, test);
}
public Sequence<? extends Item> eval(Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
if(contextSeq == null) {
throw new DynamicError("err:XPDY0002", "ContextItem is not set");
}
final INodeSequence<XQNode> src = ProxyNodeSequence.wrap(contextSeq, dynEnv);
final IFocus<XQNode> srcitor = src.iterator();
if(srcitor.hasNext()) {
final XQNode n = srcitor.next();
if(srcitor.hasNext()) {
srcitor.closeQuietly();
reportError("err:XPTY0020", "Context item is expected to be a node, but was node sequence.");
}
if(_nodeTest.accepts(n)) {
srcitor.closeQuietly();
return n;
}
}
srcitor.closeQuietly();
return NodeSequence.<XQNode> emptySequence();
}
}