/*
* @(#)$Id: DocConstructor.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.constructor;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.XQEventReceiver;
import xbird.xquery.dm.instance.XQueryDataModel;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.node.DMDocument;
import xbird.xquery.expr.AbstractXQExpression;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.meta.*;
import xbird.xquery.parser.XQueryParserVisitor;
import xbird.xquery.type.node.DocumentTest;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery/#id-documentConstructors
* @link http://www.w3.org/TR/xquery/#doc-xquery-CompDocConstructor
*/
public final class DocConstructor extends AbstractXQExpression implements NodeConstructor {
private static final long serialVersionUID = 188895787718907324L;
private XQExpression expr;
public DocConstructor(XQExpression expr) {
this.expr = expr;
this._type = DocumentTest.ANY_DOCUMENT;
}
public XQExpression getExpr() {
return this.expr;
}
public XQExpression visit(XQueryParserVisitor visitor, XQueryContext ctxt) throws XQueryException {
return visitor.visit(this, ctxt);
}
//--------------------------------------------
// static analysis/dynamic eval
public XQExpression staticAnalysis(StaticContext statEnv) throws XQueryException {
if(!_analyzed) {
this._analyzed = true;
this.expr = expr.staticAnalysis(statEnv);
}
return this;
}
public Sequence<? extends Item> eval(Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
Sequence contents = expr.eval(contextSeq, dynEnv);
DMDocument doc = XQueryDataModel.createDocument(dynEnv.getStaticContext().getBaseURIString(), contents);
return doc;
}
@Override
public void evalAsEvents(XQEventReceiver handler, Sequence<? extends Item> contextSeq, DynamicContext dynEnv) throws XQueryException {
Sequence<? extends Item> contents = expr.eval(contextSeq, dynEnv);
handler.evStartDocument();
handler.emit(contents);
handler.evEndDocument();
}
}