/* // $Id: //guest/julian_hyde/saffron/src/main/saffron/rel/java/JavaDistinct.java#1 $ // Saffron preprocessor and data engine // Copyright (C) 2002 Julian Hyde <julian.hyde@mail.com> // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Library General Public // License as published by the Free Software Foundation; either // version 2 of the License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Library General Public License for more details. // // You should have received a copy of the GNU Library General Public // License along with this library; if not, write to the // Free Software Foundation, Inc., 59 Temple Place - Suite 330, // Boston, MA 02111-1307, USA. // // See the COPYING file located in the top-level-directory of // the archive of this library for complete text of license. */ package saffron.rel.java; import openjava.mop.Toolbox; import openjava.ptree.*; import saffron.Planner; import saffron.opt.CallingConvention; import saffron.opt.Cluster; import saffron.opt.Cost; import saffron.opt.Implementor; import saffron.rel.Distinct; import saffron.rel.Rel; import saffron.util.Util; /** * <code>JavaDistinct</code> implements {@link Distinct} inline. See also * {@link JavaAggregate}. **/ public class JavaDistinct extends Distinct { Variable var_h; public JavaDistinct(Cluster cluster, Rel child) { super(cluster, child); } // implement Rel public Object clone() { return new JavaDistinct(cluster, child); } public int getConvention() { return CallingConvention.JAVA; } public Cost computeSelfCost(Planner planner) { double dRows = child.getRows(), dCpu = Util.nLogN(dRows), // reflects memory cost also dIo = 0; return planner.makeCost(dRows, dCpu, dIo); } public Object implement(Implementor implementor, int ordinal) { switch (ordinal) { case -1: { // Generate // HashSet h = new HashSet(); // <<parent>> StatementList stmtList = implementor.getStatementList(); this.var_h = implementor.newVariable(); stmtList.add( new VariableDeclaration( new TypeName("java.util.HashSet"), var_h.toString(), new AllocationExpression( new TypeName("java.util.HashSet"), null))); return implementor.implementChild(this, 0, child); } case 0: // called from child { // Generate // if (h.add(<<child variable>>)) { // <<parent-handler>> // } StatementList stmtList = implementor.getStatementList(); StatementList ifBody = new StatementList(); stmtList.add( new IfStatement( new MethodCall( this.var_h, "add", new ExpressionList( Toolbox.box( child.getRowType(), implementor.translateInput(this, 0)))), ifBody)); implementor.generateParentBody(this, ifBody); return null; } default: throw Util.newInternal( "implement: ordinal=" + ordinal); } } }
# | Change | User | Description | Committed | |
---|---|---|---|---|---|
#2 | 1853 | Julian Hyde |
saffron: Further improve binding of rows to variables. |
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#1 | 1467 | Julian Hyde |
saffron: First saffron check-in; incorporate my changes to openjava. |