/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.jena.sparql.syntax.syntaxtransform ;
import java.util.List ;
import org.apache.jena.graph.Node ;
import org.apache.jena.query.Query ;
import org.apache.jena.sparql.core.Var ;
import org.apache.jena.sparql.expr.Expr ;
import org.apache.jena.sparql.syntax.* ;
/** Create a copy if the Element(s) below has chanaged.
* This is a common base class for writing recursive {@link ElementTransform}
* in conjunction with being applied by {@link ElementTransformer}.
*/
public class ElementTransformCopyBase implements ElementTransform {
// Note the use of == as object pointer equality.
@Override
public Element transform(ElementTriplesBlock el) {
return el ;
}
@Override
public Element transform(ElementPathBlock el) {
return el ;
}
@Override
public Element transform(ElementFilter el, Expr expr2) {
if ( el.getExpr() == expr2 )
return el ;
return new ElementFilter(expr2) ;
}
@Override
public Element transform(ElementAssign el, Var v, Expr expr2) {
if ( el.getVar() == v && el.getExpr() == expr2 )
return el ;
return new ElementAssign(v, expr2) ;
}
@Override
public Element transform(ElementBind el, Var v, Expr expr2) {
if ( el.getVar() == v && el.getExpr() == expr2 )
return el ;
return new ElementBind(v, expr2) ;
}
@Override
public Element transform(ElementData el) {
return el ;
}
@Override
public Element transform(ElementUnion el, List<Element> elts) {
if ( el.getElements() == elts )
return el ;
ElementUnion el2 = new ElementUnion() ;
el2.getElements().addAll(elts) ;
return el2 ;
}
@Override
public Element transform(ElementOptional el, Element elt1) {
if ( el.getOptionalElement() == elt1 )
return el ;
return new ElementOptional(elt1) ;
}
@Override
public Element transform(ElementGroup el, List<Element> elts) {
if ( el.getElements() == elts )
return el ;
ElementGroup el2 = new ElementGroup() ;
el2.getElements().addAll(elts) ;
return el2 ;
}
@Override
public Element transform(ElementDataset el, Element elt1) {
if ( el.getElement() == elt1 )
return el ;
return new ElementDataset(el.getDataset(), elt1) ;
}
@Override
public Element transform(ElementNamedGraph el, Node gn, Element elt1) {
if ( el.getGraphNameNode() == gn && el.getElement() == elt1 )
return el ;
return new ElementNamedGraph(gn, elt1) ;
}
@Override
public Element transform(ElementExists el, Element elt1) {
if ( el.getElement() == elt1 )
return el ;
return new ElementExists(elt1) ;
}
@Override
public Element transform(ElementNotExists el, Element elt1) {
if ( el.getElement() == elt1 )
return el ;
return new ElementNotExists(elt1) ;
}
@Override
public Element transform(ElementMinus el, Element elt1) {
if ( el.getMinusElement() == elt1 )
return el ;
return new ElementMinus(elt1) ;
}
@Override
public Element transform(ElementService el, Node service, Element elt1) {
if ( el.getServiceNode() == service && el.getElement() == elt1 )
return el ;
return new ElementService(service, elt1, el.getSilent()) ;
}
@Override
public Element transform(ElementSubQuery el, Query query) {
if ( el.getQuery() == query )
return el ;
return new ElementSubQuery(query) ;
}
}