/*
* 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.sdb.core.sqlnode;
import com.hp.hpl.jena.sdb.core.sqlexpr.SqlExpr;
import com.hp.hpl.jena.sdb.core.sqlexpr.SqlExprList;
import com.hp.hpl.jena.sdb.shared.SDBInternalError;
// Class no longer used/
public class SqlRestrict extends SqlNodeBase1
{
private SqlExprList conditions = new SqlExprList() ;
private static SqlNode restrict(SqlNode sqlNode, SqlExpr condition)
{
// Consider just making a Restriction node
// and do moving into Joins as part of relational algrebra tree optimizations
// c.f. the Join creation code that also moving restrictions around.
if ( sqlNode.isJoin() )
{
sqlNode.asJoin().addCondition(condition) ;
return sqlNode ;
}
if ( sqlNode.isRestrict() )
{
// Already a restriction - add to the restrictions already in place
sqlNode.asRestrict().conditions.add(condition) ;
return sqlNode ;
}
return new SqlRestrict(sqlNode.getAliasName(), sqlNode, condition) ;
}
private static SqlNode restrict(SqlNode sqlNode, SqlExprList restrictions)
{
if ( restrictions.size() == 0 )
return sqlNode ;
if ( sqlNode.isJoin() )
{
sqlNode.asJoin().addConditions(restrictions);
return sqlNode ;
}
if ( sqlNode.isRestrict() )
{
// Already a restriction - add to the restrictions already in place
sqlNode.asRestrict().conditions.addAll(restrictions) ;
return sqlNode ;
}
return new SqlRestrict(sqlNode.getAliasName(), sqlNode, restrictions) ;
}
private SqlRestrict(SqlNode sqlNode, SqlExpr condition)
{
super(null, sqlNode) ;
this.conditions.add(condition) ;
}
private SqlRestrict(String aliasName, SqlNode sqlNode, SqlExpr condition)
{
super(aliasName, sqlNode) ;
this.conditions.add(condition) ;
}
private SqlRestrict(String aliasName, SqlNode sqlNode, SqlExprList conditions)
{
super(aliasName, sqlNode) ;
this.conditions = conditions ;
}
private SqlRestrict(SqlTable table, SqlExprList conditions)
{
super(table.getAliasName(), table) ;
this.conditions = conditions ;
}
@Override
public boolean isRestrict() { return true ; }
@Override
public SqlRestrict asRestrict() { return this ; }
public SqlExprList getConditions() { return conditions ; }
@Override
public void visit(SqlNodeVisitor visitor)
{ throw new SDBInternalError("SqlRestrict.visit") ; }
//{ visitor.visit(this) ; }
@Override
public SqlNode apply(SqlTransform transform, SqlNode subNode)
{ throw new SDBInternalError("SqlRestrict.apply") ; }
//{ return transform.transform(this, subNode) ; }
@Override
public SqlNode copy(SqlNode subNode)
{
return new SqlRestrict(this.getAliasName(), subNode, conditions) ;
}
}