/*
* @(#)$Id: BaseURI.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.net.URI;
import xbird.xquery.DynamicError;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.NodeKind;
import xbird.xquery.dm.instance.XQueryDataModel;
import xbird.xquery.dm.value.*;
import xbird.xquery.dm.value.sequence.SingleCollection;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.dm.value.xsi.AnyURIValue;
import xbird.xquery.func.BuiltInFunction;
import xbird.xquery.func.FunctionSignature;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.meta.IFocus;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
/**
* fn:base-uri.
* <DIV lang="en">
* Returns the value of the base-uri property for $arg as defined by the accessor function
* dm:base-uri() for that kind of node.
* <ul>
* <li>fn:base-uri() as xs:anyURI?</li>
* <li>fn:base-uri($arg as node()?) as xs:anyURI?</li>
* </ul>
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-base-uri
*/
public final class BaseURI extends BuiltInFunction {
private static final long serialVersionUID = 3238299697550247261L;
public static final String SYMBOL = "fn:base-uri";
public BaseURI() {
super(SYMBOL, TypeRegistry.safeGet("xs:anyURI?"));
}
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 {
if(argv == null) {
// If $arg is not specified, returns the value of the base-uri property
// of the context item (.)
final Item contextItem = dynEnv.contextItem();
if(argv == null) {
if(contextItem == null) {
throw new DynamicError("err:XPDY0002", "Context Item is not set");
} else {
if(!(contextItem instanceof XQNode)) {
throw new DynamicError("err:XPTY0004", "Context item is not a node: "
+ contextItem.getClass().getName());
}
}
} else if(argv.isEmpty()) {// If $arg is the empty sequence, the empty sequence is returned.
return ValueSequence.EMPTY_SEQUENCE;
}
}
Item it = argv.getItem(0);
if(it instanceof SingleCollection) {
final Sequence<? extends Item> src = ((SingleCollection) it).getSource();
final IFocus<? extends Item> itor = src.iterator();
if(!itor.hasNext()) {
itor.closeQuietly();
return ValueSequence.EMPTY_SEQUENCE;
}
it = itor.next();
if(itor.hasNext()) {
itor.closeQuietly();
throw new DynamicError("err:XPTY0004", "Context item is not a node: " + src);
}
itor.closeQuietly();
}
if(!(it instanceof XQNode)) {
if(it.isEmpty()) {
return ValueSequence.EMPTY_SEQUENCE;
} else {
throw new DynamicError("err:XPTY0004", "Item was not a node: "
+ it.getClass().getName());
}
}
final XQNode node = (XQNode) it;
final byte nodekind = node.nodeKind();
// Document, element and processing-instruction nodes have a base-uri property
// which may be empty. The base-uri property of all other node types is the empty sequence.
switch(nodekind) {
case NodeKind.DOCUMENT:
case NodeKind.ELEMENT: {
final String uri = node.baseUri();
final URI baseUri = dynEnv.getStaticContext().getBaseURI();
if(uri == null) {
if(node.getDataModel() == XQueryDataModel.INSTANCE) {
if(baseUri != null) {
return AnyURIValue.valueOf(baseUri);
}
}
break;
} else {
if(baseUri == null) {
return AnyURIValue.valueOf(uri);
} else {
final URI resolved = baseUri.resolve(uri);
return AnyURIValue.valueOf(resolved);
}
}
}
case NodeKind.PROCESSING_INSTRUCTION:
final String uri = node.baseUri();
if(uri != null) {
return AnyURIValue.valueOf(uri);
}
default:
break;
}
return ValueSequence.EMPTY_SEQUENCE;
}
}