/*
* @(#)$Id: NodeName.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.func.accessor;
import java.util.List;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.*;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.dm.value.xsi.QNameValue;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.func.*;
import xbird.xquery.func.opt.EagerEvaluated;
import xbird.xquery.meta.*;
import xbird.xquery.misc.QNameTable.QualifiedName;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
/**
* fn:node-name($arg as node()?) as xs:QName?.
* <DIV lang="en">
* Returns an expanded-QName for node kinds that can have names.
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-node-name
*/
public final class NodeName extends BuiltInFunction {
private static final long serialVersionUID = 3720642424037052117L;
public static final String SYMBOL = "fn:node-name";
public NodeName() {
super(SYMBOL, TypeRegistry.safeGet("xs:QName?"));
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[1];
s[0] = new FunctionSignature(getName(), new Type[] { TypeRegistry.safeGet("node()?") });
return s;
}
public Function staticAnalysis(StaticContext context, List<? extends XQExpression> params)
throws XQueryException {
assert (params != null);
if(params.isEmpty()) {
return new EagerEvaluated(this, ValueSequence.EMPTY_SEQUENCE);
}
return this;
}
public Sequence eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv)
throws XQueryException {
if(argv.isEmpty()) {
return ValueSequence.EMPTY_SEQUENCE;
}
final Item it = argv.getItem(0);
final IFocus<? extends Item> itemItor = it.iterator();
if(!itemItor.hasNext()) {
itemItor.closeQuietly();
return ValueSequence.EMPTY_SEQUENCE;
}
final Item first = itemItor.next();
assert (!itemItor.hasNext()) : it;
itemItor.closeQuietly();
final XQNode node = (XQNode) first;
final QualifiedName nodename = node.nodeName();
if(nodename != null) {
return new QNameValue(nodename);
}
return ValueSequence.EMPTY_SEQUENCE;
}
}