/*
* @(#)$Id: ResolveQName.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.qname;
import xbird.util.xml.XMLUtils;
import xbird.xquery.DynamicError;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.XQNode;
import xbird.xquery.dm.value.literal.XString;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.dm.value.xsi.QNameValue;
import xbird.xquery.func.BuiltInFunction;
import xbird.xquery.func.FunctionSignature;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.misc.QNameUtil;
import xbird.xquery.misc.QNameTable.QualifiedName;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
import xbird.xquery.type.node.ElementTest;
/**
* fn:resolve-QName($qname as xs:string?, $element as element()) as xs:QName?.
* <DIV lang="en">
* Returns an xs:QName value by taking an xs:string that has the lexical form of
* an xs:QName and resolving it using the in-scope namespaces for a given element.
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-resolve-QName
*/
public final class ResolveQName extends BuiltInFunction {
private static final long serialVersionUID = -9054654027397389917L;
public static final String SYMBOL = "fn:resolve-QName";
public ResolveQName() {
super(SYMBOL, TypeRegistry.safeGet("xs:QName?"));
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[1];
s[0] = new FunctionSignature(getName(), new Type[] { TypeRegistry.safeGet("xs:string?"),
ElementTest.ANY_ELEMENT });
return s;
}
public Sequence eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv)
throws XQueryException {
assert (argv != null && argv.size() == 2);
// If $qname is the empty sequence, returns the empty sequence.
Item firstItem = argv.getItem(0);
if(firstItem.isEmpty()) {
return ValueSequence.EMPTY_SEQUENCE;
}
XString qname = (XString) firstItem;
String qnameStr = qname.getValue();
final int pos = qnameStr.indexOf(':');
final String nsuri;
if(pos == -1) {
// If the $qname has no prefix, and there is no namespace binding for $element
// corresponding to the default (unnamed) namespace, then the resulting expanded-QName
// has no namespace part.
nsuri = XMLUtils.NULL_NS_URI;
} else {
final String prefix = qnameStr.substring(0, pos - 1);
Item secondItem = argv.getItem(1);
XQNode element = (XQNode) secondItem;
nsuri = NamespaceUriForPrefix.resolveNamespaceUri(element, prefix);
if(nsuri == null) {
// If the $qname has a prefix and if there is no namespace binding for $element
// that matches this prefix, then an error is raised [err:FONS0004].
throw new DynamicError("err:FONS0004", "Namespace for the prefix `" + qnameStr
+ "` not found");
}
}
final QualifiedName resolved;
try {
resolved = QNameUtil.parse(qnameStr, nsuri);
} catch (IllegalArgumentException e) {
// If $qname does not have the correct lexical form for xs:QName an error
// is raised [err:FOCA0002].
throw new DynamicError("err:FOCA0002", "Illegal qname form: " + qnameStr);
}
return new QNameValue(resolved);
}
}