/* // $Id: //guest/julian_hyde/saffron/src/main/saffron/rel/java/JavaProject.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.ptree.*; import saffron.opt.CallingConvention; import saffron.opt.Cluster; import saffron.opt.Implementor; import saffron.rel.Project; import saffron.rel.Rel; import saffron.util.Util; /** * <code>JavaProject</code> implements {@link Project} as code. **/ public class JavaProject extends Project { public JavaProject( Cluster cluster, Rel child, Expression[] exps, String[] fieldNames, boolean boxed) { super(cluster, child, exps, fieldNames, boxed); } public Object clone() { return new JavaProject( cluster, Util.clone(child), Util.clone(exps), Util.clone(fieldNames), boxed); } // implement Rel public int getConvention() { return CallingConvention.JAVA; } // implement Rel public Object implement(Implementor implementor, int ordinal) { switch (ordinal) { case -1: // called from parent return implementor.implementChild(this, 0, child); case 0: // called from child // If the row-type V is complex, generate // V v = new V(exp, ...); // <<parent-handler(v)>> // // If the row-type is simple, generate // V v = exp; // <<parent-handler(v)>> // // Todo: map relations to expressions (not variables), so we // don't have to create new objects: // T1 v1 = exp1; // T2 v2 = exp2; // <<parent-handler(v1,v2)>> // // Or at least, create a holder object outside the loop, and // just assign into it: // V v = new V(); // <<loop>> { // v.v1 = exp1; // v.v2 = exp2; // <<parent-handler(v)>> // } // StatementList stmtList = implementor.getStatementList(); Variable v = implementor.newVariable(); implementor.bind(this, v); Expression initializer; if (!boxed) { // simple row-type, hence "V v = exp;" initializer = implementor.translate(this, exps[0]); } else { // complex row-type, hence "V v = new V(exp, ...);" ExpressionList args = new ExpressionList(); for (int i = 0; i < exps.length; i++) { args.add(implementor.translate(this, exps[i])); } initializer = new AllocationExpression( getRowType(), args); } stmtList.add( new VariableDeclaration( TypeName.forOJClass(getRowType()), v.toString(), initializer)); implementor.generateParentBody(this, null); return null; default: throw Util.newInternal( "implement: ordinal=" + ordinal); } } }
# | Change | User | Description | Committed | |
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#3 | 1853 | Julian Hyde |
saffron: Further improve binding of rows to variables. |
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#2 | 1801 | Julian Hyde |
saffron: add ObjectSchema; rules can now be matched more than once; started to implement correlations in queries in from list. |
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#1 | 1467 | Julian Hyde |
saffron: First saffron check-in; incorporate my changes to openjava. |