Package com.hp.hpl.jena.sdb.core.sqlnode

Examples of com.hp.hpl.jena.sdb.core.sqlnode.SqlNode

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    //@Override
    @Override
    final
    public SqlNode compile(QuadBlock quads)
    {
        SqlNode sqlNode = slotCompiler.start(quads) ;
        quads = new QuadBlock(quads) ;          // Copy it because it's modified.

        // ---- Stage builder
        SqlStageList sList = new SqlStageList() ;
        // Potential concurrent modification - need to use an explicit index.
        for ( int i = 0 ; i < quads.size() ; )
        {
            Quad q = quads.get(i) ;
            if ( patternTable != null && patternTable.trigger(q) )
            {
                // Removes current quad
                SqlStage stage = patternTable.process(i, quads) ;
                if ( stage != null )
                {
                    if ( quads.get(i) == q )
                        throw new SDBInternalError("Pattern table returned a stage but did not remove the first quad") ;
                    sList.add(stage) ;
                    continue ;
                }
            }
            sList.add(new SqlStageBasicQuad(q)) ;
            i++ ;
        }

        // ---- and now turn the stages into SqlNodes 
        SqlNode sqlStages = sList.build(request, slotCompiler) ;
       
        // --- Join the initial node (constants).
        sqlNode = SqlBuilder.innerJoin(request, sqlNode, sqlStages) ;
        sqlNode = slotCompiler.finish(sqlNode, quads) ;
       
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    }

    public static String toSqlString(OpSQL opSQL,
                                     SDBRequest request)
    {
        SqlNode sqlNode = opSQL.getSqlNode() ;
        String sqlStmt = request.getStore().getSQLGenerator().generateSQL(request, sqlNode) ;
        return sqlStmt ;
    }
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    @Override
    public Op transform(OpQuadPattern quadPattern)
    {
        QuadBlock qBlk = new QuadBlock(quadPattern) ;
        SqlNode node = quadBlockCompiler.compile(qBlk) ;
        return new OpSQL(node, quadPattern, request) ;
    }
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        if ( true )
            return super.transform(opJoin, left, right) ;
       
        if ( ! SDB_QC.isOpSQL(left) || ! SDB_QC.isOpSQL(right) )
            return super.transform(opJoin, left, right) ;
        SqlNode sqlLeft = ((OpSQL)left).getSqlNode() ;
        SqlNode sqlRight = ((OpSQL)right).getSqlNode() ;
       
        // This is wrong.  If right is more than single triple pattern,
        // the generated SQL wil attempt to use NodeTable lookups from the
        // LHS but they are out of scope.
       
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        // Condition(s) in the left join.  Punt for now.
        if ( opJoin.getExprs() != null )
            return super.transform(opJoin, left, right) ;
       
        SqlNode sqlLeft = ((OpSQL)left).getSqlNode() ;
        SqlNode sqlRight = ((OpSQL)right).getSqlNode() ;
       
        // Check for coalesce.
        // Do optional variables on the right appear only as optional variables on the left?

        Set<ScopeEntry> scopes = sqlLeft.getIdScope().findScopes() ;
       
        // Find optional-on-left
        Set<ScopeEntry> scopes2 = toSet(filter(scopes, ScopeEntry.OptionalFilter)) ;
        Set<Var> leftOptVars = toSet(map(scopes2, ScopeEntry.ToVar)) ;              // Vars from left optionals.
       
        if ( false )
        {
            Iter<ScopeEntry> iter = Iter.iter(scopes) ;
            Set<Var> leftOptVars_ = iter.filter(ScopeEntry.OptionalFilter).map(ScopeEntry.ToVar).toSet() ;
        }
       
        // Find optional-on-right (easier - it's all variables)
        Set<Var> rightOptVars = sqlRight.getIdScope().getVars() ;
       
        // And finally, calculate the intersection of the two.
        // SetUtils extension - one side could be an iterator 
        Set<Var> coalesceVars = intersection(leftOptVars, rightOptVars) ;
       
        // Future simplification : LeftJoinClassifier.nonLinearVars
//        if ( ! coalesceVars.equals(LeftJoinClassifier.nonLinearVars( opJoin.getLeft(), opJoin.getRight() )) )
//        { unexpected }
       
        if ( coalesceVars.size() > 0  )
        {
            String alias = request.genId(AliasesSql.CoalesceAliasBase) ;
            SqlNode sqlNode = SqlBuilder.leftJoinCoalesce(request, alias,
                                                  sqlLeft, sqlRight,
                                                  coalesceVars) ;
            return new OpSQL(sqlNode, opJoin, request) ;
           
            // Punt
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        // Derby does not support DISTINCT on CLOBS
        if ( ! request.DistinctTranslation )
            return super.transform(opDistinct, subOp) ;
       
        OpSQL opSubSQL = (OpSQL)subOp ;
        SqlNode sqlSubOp = opSubSQL.getSqlNode() ;
        SqlNode n = SqlSelectBlock.distinct(request, sqlSubOp) ;
        OpSQL opSQL = new OpSQL(n, opDistinct, request) ;
        // Pull up bridge, if any
        opSQL.setBridge(opSubSQL.getBridge()) ;
        return opSQL ;
    }
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    // See QueryCompilerMain.SqlNodesFinisher.visit(OpExt op)
    // Be careful about being done twice.
    // XXX SHARE CODE!
    static private OpSQL doBridge(SDBRequest request, OpSQL opSQL, List<Var> projectVars, Op original)
    {
        SqlNode sqlNode = opSQL.getSqlNode() ;
        SQLBridgeFactory f = request.getStore().getSQLBridgeFactory() ;
        SQLBridge bridge = f.create(request, sqlNode, projectVars) ;
        bridge.build();
        sqlNode = bridge.getSqlNode() ;
        opSQL = new OpSQL(sqlNode, original, request) ;
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        // Inner SELECT SQL: (SELECT DISTINCT g FROM Quads)
        TableDescQuads quads = request.getStore().getQuadTableDesc() ;
        SqlTable sqlTableQ = new SqlTable(quads.getTableName()) ;
        sqlTableQ.setIdColumnForVar(v, new SqlColumn(sqlTableQ, quads.getGraphColName())) ;
        SqlNode sqlNodeQ = SqlSelectBlock.distinct(request, sqlTableQ) ;
       
        // Will have the value left join added later.
        return new OpSQL(sqlNodeQ, opDatasetNames, request) ;
    }
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                // All variables.
                Collection<Var> tmp = OpVars.patternVars(opSQL.getOriginal()) ;
                projectVars = new ArrayList<Var>(tmp) ;
            }
                   
            SqlNode sqlNode = opSQL.getSqlNode() ;
           
            SQLBridgeFactory f = request.getStore().getSQLBridgeFactory() ;
           
            SQLBridge bridge = f.create(request, sqlNode, projectVars) ;
            bridge.build();
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        }

        private Op transformSlice(OpSlice opSlice, OpSQL opSQL)
        {
            // (slice X)
            SqlNode sqlSubOp = opSQL.getSqlNode() ;
            SqlNode n = SqlSelectBlock.slice(request, sqlSubOp, opSlice.getStart(), opSlice.getLength()) ;
            OpSQL x = new OpSQL(n, opSlice, request) ;
            x.setBridge(opSQL.getBridge()) ;
            return x ;
        }
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Related Classes of com.hp.hpl.jena.sdb.core.sqlnode.SqlNode

  • com.hp.hpl.jena.sdb.compiler.QuadBlockCompilerMain
  • com.hp.hpl.jena.sdb.compiler.QueryCompilerMain$DistinctOptimizer
  • com.hp.hpl.jena.sdb.compiler.QueryCompilerMain$LimitOffsetOptimizer
  • com.hp.hpl.jena.sdb.compiler.QueryCompilerMain$SqlNodesFinisher
  • com.hp.hpl.jena.sdb.compiler.SDB_QC
  • com.hp.hpl.jena.sdb.compiler.SqlStageList
  • com.hp.hpl.jena.sdb.compiler.TransformSDB
  • com.hp.hpl.jena.sdb.layout2.index.SlotCompilerIndex
  • com.hp.hpl.jena.sdb.layout2.QueryCompiler2$FilterOptimizer
  • com.hp.hpl.jena.sdb.layout2.SQLBridge2
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