/*
* @(#)$Id: LocalName.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.node;
import xbird.xquery.DynamicError;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.*;
import xbird.xquery.dm.value.literal.XString;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.func.BuiltInFunction;
import xbird.xquery.func.FunctionSignature;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.misc.QNameTable.QualifiedName;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
import xbird.xquery.type.xs.StringType;
/**
* fn:local-name.
* <DIV lang="en">
* Returns the local part of the name of $arg as an xs:string that will either be
* the zero-length string or will have the lexical form of an xs:NCName.
* <ul>
* <li>fn:local-name() as xs:string</li>
* <li>fn:local-name($arg as node()?) as xs:string</li>
* </ul>
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-local-name
*/
public final class LocalName extends BuiltInFunction {
private static final long serialVersionUID = 7137754089857349444L;
public static final String SYMBOL = "fn:local-name";
public LocalName() {
super(SYMBOL, StringType.STRING);
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[2];
s[0] = new FunctionSignature(getName());
s[1] = new FunctionSignature(getName(), new Type[] { TypeRegistry.safeGet("node()?") });
return s;
}
public Sequence eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv) throws XQueryException {
final XQNode node;
if (argv == null) {
// If the argument is omitted, it defaults to the context node.
Item contextItem = dynEnv.contextItem();
if (contextItem == null) {
throw new DynamicError("err:XPDY0002", "ContextItem is not set");
}
if (!(contextItem instanceof XQNode)) {
throw new DynamicError("err:XPTY0004", "context item is expected to be a node, but was "
+ contextItem.getType());
}
node = (XQNode) contextItem;
} else {
assert (argv.size() == 1);
Item firstItem = argv.getItem(0);
node = (XQNode) firstItem;
}
final String lpart;
if (node.isEmpty()) {
lpart = "";
} else {
QualifiedName nodename = node.nodeName();
if (nodename == null) {
lpart = "";
} else {
lpart = nodename.getLocalPart();
}
}
return XString.valueOf(lpart);
}
}