/*
* @(#)$Id: DocumentUri.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.instance.DocumentTableModel.DTMDocument;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.node.DMDocument;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.dm.value.xsi.AnyURIValue;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.func.*;
import xbird.xquery.func.opt.EagerEvaluated;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.meta.StaticContext;
import xbird.xquery.misc.TypeUtil;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
import xbird.xquery.type.node.DocumentTest;
/**
* fn:document-uri($arg as node()?) as xs:anyURI?.
* <DIV lang="en">
* Returns the value of the document-uri property for $arg as defined by
* the dm:document-uri accessor function.
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-document-uri
*/
public final class DocumentUri extends BuiltInFunction {
private static final long serialVersionUID = 3691361485629917174L;
public static final String SYMBOL = "fn:document-uri";
public DocumentUri() {
super(SYMBOL, TypeRegistry.safeGet("xs:anyURI?"));
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[1];
s[0] = new FunctionSignature(getName(), new Type[] { TypeRegistry.safeGet("node()?") });
return s;
}
@Override
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 {
assert (argv != null);
// If $arg is the empty sequence, the empty sequence is returned.
if(argv.isEmpty()) {
return ValueSequence.EMPTY_SEQUENCE;
}
// Returns the empty sequence if the node is not a document node.
// Otherwise, returns the value of the dm:document-uri accessor of the document node.
assert (argv.size() == 1);
Item arg = argv.getItem(0);
Type type = arg.getType();
if(!TypeUtil.subtypeOf(type, DocumentTest.ANY_DOCUMENT)) {
return ValueSequence.EMPTY_SEQUENCE;
}
final String docuri;
if(arg instanceof DTMDocument) {
docuri = ((DTMDocument) arg).documentUri();
} else if(arg instanceof DMDocument) {
docuri = ((DMDocument) arg).documentUri();
} else {
throw new IllegalStateException("Invalid document node type: "
+ arg.getClass().getName());
}
if(docuri == null) {
return ValueSequence.EMPTY_SEQUENCE;
}
return AnyURIValue.valueOf(docuri);
}
}