/*
* 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.algebra.walker;
import org.apache.jena.sparql.algebra.OpVisitor ;
import org.apache.jena.sparql.algebra.op.OpMinus ;
import org.apache.jena.sparql.algebra.op.OpProject ;
import org.apache.jena.sparql.expr.ExprFunctionOp ;
import org.apache.jena.sparql.expr.ExprVisitor ;
/** Walk algebra
* Do project, don't walk into it.
* Don' walk into RHS of MINUS nor ExprFunctionOp (NOT EXISTS etc)
*/
public class WalkerVisitorVisible extends WalkerVisitor {
public WalkerVisitorVisible(OpVisitor opVisitor, ExprVisitor exprVisitor, OpVisitor before, OpVisitor after) {
super(opVisitor, exprVisitor, before, after) ;
}
@Override
public void visit(OpProject op) {
//before(op) ;
// Skip inner.
//after(op) ;
}
@Override
public void visit(OpMinus op) {
before(op) ;
if (op.getLeft() != null)
op.getLeft().visit(this) ;
// Skip right.
// if ( op.getRight() != null ) op.getRight().visit(this) ;
if (opVisitor != null)
op.visit(opVisitor) ;
after(op) ;
}
@Override
public void visit(ExprFunctionOp funcOp) {
// Skip the pattern
//walk(funcOp.getGraphPattern());
if ( exprVisitor != null )
funcOp.visit(exprVisitor) ;
}
}