/*
* 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.op;
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.expr.Expr ;
import com.hp.hpl.jena.sparql.expr.ExprList ;
import com.hp.hpl.jena.sparql.sse.Tags ;
import com.hp.hpl.jena.sparql.util.NodeIsomorphismMap ;
public class OpLeftJoin extends Op2
{
ExprList expressions = null ;
public static Op create(Op left, Op right, ExprList exprs)
{
return new OpLeftJoin(left, right, exprs) ;
}
public static Op create(Op left, Op right, Expr expr)
{
return new OpLeftJoin(left, right, expr == null ? null : new ExprList(expr)) ;
}
protected OpLeftJoin(Op left, Op right, ExprList exprs)
{
super(left, right) ;
expressions = exprs ;
}
public ExprList getExprs() { return expressions ; }
@Override
public String getName() { return Tags.tagLeftJoin ; }
@Override
public Op apply(Transform transform, Op left, Op right)
{ return transform.transform(this, left, right) ; }
@Override
public void visit(OpVisitor opVisitor) { opVisitor.visit(this) ; }
@Override
public Op copy(Op newLeft, Op newRight)
{ return new OpLeftJoin(newLeft, newRight, expressions) ; }
@Override
public boolean equalTo(Op op2, NodeIsomorphismMap labelMap)
{
if ( ! ( op2 instanceof OpLeftJoin) ) return false ;
return super.sameArgumentsAs((Op2)op2, labelMap) ;
}
}