/*
* @(#)$Id: ContextItemExpr.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.expr.dyna;
import xbird.xquery.DynamicError;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.expr.AbstractXQExpression;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.meta.*;
import xbird.xquery.parser.XQueryParserVisitor;
import xbird.xquery.type.SequenceType;
import xbird.xquery.type.Type;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-semantics/#id-context-item-expression
*/
public final class ContextItemExpr extends AbstractXQExpression {
private static final long serialVersionUID = 1950976554678633349L;
public ContextItemExpr() {
this(SequenceType.ANY_ITEMS); // ContextItem may be either a node or an atomic value.
}
public ContextItemExpr(final Type type) {
super();
this._type = type;
}
public XQExpression visit(XQueryParserVisitor visitor, XQueryContext ctxt)
throws XQueryException {
return visitor.visit(this, ctxt);
}
@Override
public String toString() {
return ".";
}
public XQExpression staticAnalysis(StaticContext statEnv) throws XQueryException {
Type curType = statEnv.getContextItemStaticType();
if(curType != null) {
this._type = curType;
}
return this;
}
public Sequence<? extends Item> eval(Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
if(contextSeq == null) {
throw new DynamicError("err:XPDY0002", "ContextItem is not set");
}
return contextSeq;
}
}