/*
* 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.layout2.hash;
import static org.apache.jena.atlas.lib.StrUtils.strjoinNL;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.sdb.Store;
import com.hp.hpl.jena.sdb.core.sqlexpr.SqlConstant;
import com.hp.hpl.jena.sdb.layout2.NodeLayout2;
import com.hp.hpl.jena.sdb.layout2.TableDescNodes;
import com.hp.hpl.jena.sdb.sql.RS;
import com.hp.hpl.jena.sdb.sql.ResultSetJDBC;
import com.hp.hpl.jena.sdb.sql.SDBConnection;
import com.hp.hpl.jena.sdb.sql.SQLUtils;
import com.hp.hpl.jena.sdb.store.TableDesc;
import com.hp.hpl.jena.sdb.store.TupleLoaderOne;
public class TupleLoaderOneHash extends TupleLoaderOne
{
public TupleLoaderOneHash(SDBConnection connection)
{ super(connection) ; }
/* Convenience constructor */
public TupleLoaderOneHash(SDBConnection connection, TableDesc tableDesc)
{ super(connection, tableDesc) ; }
/* Convenience constructor */
public TupleLoaderOneHash(Store store, TableDesc tableDesc)
{ super(store.getConnection(), tableDesc) ; }
@Override
public SqlConstant getRefForNode(Node node) throws SQLException
{
return new SqlConstant(NodeLayout2.hash(node)) ;
}
@Override
public SqlConstant insertNode(Node node) throws SQLException
{
int typeId = NodeLayout2.nodeToType(node) ;
String lex = NodeLayout2.nodeToLex(node) ;
String lang = "" ;
String datatype = "" ;
if ( node.isLiteral() )
{
lang = node.getLiteralLanguage() ;
datatype = node.getLiteralDatatypeURI() ;
if ( datatype == null )
datatype = "" ;
}
long hash = NodeLayout2.hash(lex,lang,datatype,typeId);
// Existance check
String sqlStmtTest = strjoinNL(
"SELECT hash FROM "+TableDescNodes.name(),
"WHERE hash = "+hash
) ;
ResultSetJDBC rsx = null ;
try {
rsx = connection().execQuery(sqlStmtTest) ;
ResultSet rs = rsx.get();
boolean b = rs.next();
if ( b )
// Exists
return new SqlConstant(hash) ;
} finally { RS.close(rsx) ; }
String sqlStmt = strjoinNL(
"INSERT INTO "+TableDescNodes.name()+"(hash,lex,lang,datatype,type) VALUES",
" ("+hash+", ",
" "+SQLUtils.quoteStr(lex)+", ",
" "+SQLUtils.quoteStr(lang)+", ",
" "+SQLUtils.quoteStr(datatype)+", ",
" "+typeId,
")" ) ;
connection().execUpdate(sqlStmt) ;
return new SqlConstant(hash) ;
}
}