/*
* 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 com.hp.hpl.jena.sparql.algebra.optimize;
import com.hp.hpl.jena.sparql.ARQInternalErrorException ;
import com.hp.hpl.jena.sparql.algebra.Op ;
import com.hp.hpl.jena.sparql.algebra.OpVisitor ;
import com.hp.hpl.jena.sparql.algebra.Transform ;
import com.hp.hpl.jena.sparql.algebra.Transformer ;
import com.hp.hpl.jena.sparql.expr.E_Exists ;
import com.hp.hpl.jena.sparql.expr.E_NotExists ;
import com.hp.hpl.jena.sparql.expr.Expr ;
import com.hp.hpl.jena.sparql.expr.ExprFunctionOp ;
import com.hp.hpl.jena.sparql.expr.ExprList ;
import com.hp.hpl.jena.sparql.expr.ExprTransformCopy ;
/** A copying transform that applies an Op Transform to the algebra operator of E_Exist and E_NoExists */
public class ExprTransformApplyTransform extends ExprTransformCopy
{
private final Transform transform ;
private OpVisitor beforeVisitor ;
private OpVisitor afterVisitor ;
public ExprTransformApplyTransform(Transform transform)
{
this(transform, null, null) ;
}
public ExprTransformApplyTransform(Transform transform, OpVisitor beforeVisitor, OpVisitor afterVisitor)
{
this.transform = transform ;
this.beforeVisitor = beforeVisitor ;
this.afterVisitor = afterVisitor ;
}
@Override
public Expr transform(ExprFunctionOp funcOp, ExprList args, Op opArg)
{
Op opArg2 = Transformer.transform(transform, opArg, beforeVisitor, afterVisitor) ;
if ( opArg2 == opArg )
return super.transform(funcOp, args, opArg) ;
if ( funcOp instanceof E_Exists )
return new E_Exists(opArg2) ;
if ( funcOp instanceof E_NotExists )
return new E_NotExists(opArg2) ;
throw new ARQInternalErrorException("Unrecognized ExprFunctionOp: \n"+funcOp) ;
}
}