/*
* @(#)$Id: NamespaceUriForPrefix.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.xquery.XQueryException;
import xbird.xquery.dm.NodeKind;
import xbird.xquery.dm.instance.DocumentTableModel.DTMAttribute;
import xbird.xquery.dm.instance.DocumentTableModel.DTMElement;
import xbird.xquery.dm.value.*;
import xbird.xquery.dm.value.literal.XString;
import xbird.xquery.dm.value.node.DMAttribute;
import xbird.xquery.dm.value.node.DMElement;
import xbird.xquery.dm.value.sequence.INodeSequence;
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.type.Type;
import xbird.xquery.type.TypeRegistry;
import xbird.xquery.type.node.ElementTest;
/**
* fn:namespace-uri-for-prefix($prefix as xs:string?, $element as element()) as xs:anyURI?.
* <DIV lang="en">
* Returns the namespace URI of one of the in-scope namespaces for $element,
* identified by its namespace prefix.
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-namespace-uri-for-prefix
*/
public final class NamespaceUriForPrefix extends BuiltInFunction {
private static final long serialVersionUID = -5124736970576798930L;
public static final String SYMBOL = "fn:namespace-uri-for-prefix";
public NamespaceUriForPrefix() {
super(SYMBOL, TypeRegistry.safeGet("xs:anyURI?"));
}
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);
Item firstItem = argv.getItem(0);
final String prefix;
if(firstItem.isEmpty()) {
prefix = "";
} else {
prefix = ((XString) firstItem).getValue();
}
Item secondItem = argv.getItem(1);
assert (!secondItem.isEmpty());
XQNode node = (XQNode) secondItem;
assert (node.nodeKind() == NodeKind.ELEMENT);
String nsuri = resolveNamespaceUri(node, prefix);
if(nsuri == null) {
return ValueSequence.EMPTY_SEQUENCE;
}
return XString.valueOf(nsuri);
}
public static String resolveNamespaceUri(XQNode node, String prefix) {
assert (node != null && prefix != null);
if(node.nodeKind() != NodeKind.ELEMENT) {
return null;
}
if(node instanceof DMElement) {
final INodeSequence<DMAttribute> atts = ((DMElement) node).attribute();
for(DMAttribute att : atts) {
final String attPrefix = att.nodeName().getPrefix();
if(prefix.equals(attPrefix)) {
final String nsuri = att.getNamespaceURI();
return nsuri;
}
}
} else {
assert (node instanceof DTMElement);
DTMElement e = ((DTMElement) node);
DTMAttribute att = null;
for(int i = 0; (att = e.attribute(0)) != null; i++) {
final String attPrefix = att.nodeName().getPrefix();
if(prefix.equals(attPrefix)) {
final String nsuri = att.getNamespaceURI();
return nsuri;
}
}
}
return null;
}
}