Examples of org.teiid.query.processor.xml.IfInstruction

org.teiid.query.processor.xml.IfInstruction

This instruction holds a List of Criteria, and for each Criteria there is a {@link Program} that will be executed. Therefore, this ProcessorInstructionimplements an arbitrarily deep if-else if-....else block.

During processing, the Criteria are iterated through, in order. When one evaluates to true, that Criteria's Program is placed on to the Program {@link ProcessorEnvironment#getProgramStack stack}, and the loop is broken - this simulates the if-else if-... behavior. An optional "else" or "default" Program can be added via the {@link #addDefaultChoiceSubProgram addDefaultChoiceSubProgram} method - this is the optional "else" block at the end of an if-else if-... construct.

    public void end(MappingAllNode all, Map context){
        commonEnd(all, context);
    }
    
    public void start(MappingChoiceNode choice, Map context){        
        IfInstruction ifInst = new IfInstruction();        
        // if an exception should be thrown as the default choice, then add a sub program to that
        if (choice.throwExceptionOnDefault()) {
            Program subProgram = new Program();
            subProgram.addInstruction(new AbortProcessingInstruction());
            DefaultCondition defCondition = new DefaultCondition(subProgram);
            ifInst.setDefaultCondition(defCondition);            
        }
        
        // to be used by the criteria nodes.
        context.put(choice, ifInst);

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    public void start(MappingCriteriaNode node, Map context){


        // every criteria node has its own program..
        Program childProgram = new Program();
        IfInstruction ifInst = (IfInstruction)context.get(node.getParentNode());
        
        if (node.getCriteria() != null) {
            Condition condition = new CriteriaCondition(node.getCriteriaNode(), childProgram);
            ifInst.addCondition(condition);            
        }
        
        if (node.isDefault()) {
            DefaultCondition defCondition = new DefaultCondition(childProgram);
            ifInst.setDefaultCondition(defCondition);            
        }
        
        // now push the child program
        this.programStack.push(childProgram);

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        currentProgram.addInstruction(tagInst);
                
        // this is set by root recursive node. Note that the MappingClass on recursive
        // node is same as the source on the root recursive node.
        Program recursiveProgram = (Program)context.get(element.getMappingClass().toUpperCase());
        IfInstruction ifInst = new IfInstruction();
        RecurseProgramCondition recurseCondition = buildRecurseCondition(element, recursiveProgram);
        ifInst.addCondition(recurseCondition);
        ifInst.setDefaultCondition(new DefaultCondition(new Program()));
        
        currentProgram.addInstruction(ifInst);
    }

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                WhileInstruction whileInst = (WhileInstruction)inst;
                childProgram = whileInst.getBlockProgram();
                getProgramStats(childProgram, map);
            }
            else if (inst instanceof IfInstruction) {
                IfInstruction ifInst = (IfInstruction)inst;
                
                getProgramStats(ifInst.getElseProgram(), map);
                
                for (int then = 0; then < ifInst.getThenCount(); then++) {
                    childProgram = ifInst.getThenProgram(then);
                    Condition condition = ifInst.getThenCondition(then);
                    if (!(condition instanceof RecurseProgramCondition)) {
                        getProgramStats(childProgram, map);    
                    }
                }
            }

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        WhileInstruction i9 = new WhileInstruction("xmltest.rs");         //$NON-NLS-1$


        //need to move this up here so it can be referenced by "If" instruction
        ProcessorInstruction i17 = new MoveCursorInstruction("xmltest.rs"); //$NON-NLS-1$


        IfInstruction i10 = new IfInstruction( );
        descriptor = NodeDescriptor.createNodeDescriptor("Item", null, AddNodeInstruction.ELEMENT, null, null, null,false, null, MappingNodeConstants.NORMALIZE_TEXT_PRESERVE);//$NON-NLS-1$
        ProcessorInstruction i11 = new AddNodeInstruction(descriptor);
        ProcessorInstruction i12 = new MoveDocInstruction(MoveDocInstruction.DOWN);
        descriptor = NodeDescriptor.createNodeDescriptor("ItemID", null, AddNodeInstruction.ATTRIBUTE, null, null, null,false, null, MappingNodeConstants.NORMALIZE_TEXT_PRESERVE);//$NON-NLS-1$
        ProcessorInstruction i13 = new AddNodeInstruction(descriptor, new ElementSymbol("xmltest.rs.itemNum"));//$NON-NLS-1$
        descriptor = NodeDescriptor.createNodeDescriptor("Name", null, AddNodeInstruction.ELEMENT, null, null, null,false, null, MappingNodeConstants.NORMALIZE_TEXT_PRESERVE);//$NON-NLS-1$
        ProcessorInstruction i14 = new AddNodeInstruction(descriptor, new ElementSymbol("xmltest.rs.itemName"));//$NON-NLS-1$
        descriptor = NodeDescriptor.createNodeDescriptor("Quantity", null, AddNodeInstruction.ELEMENT, null, null, null,false, null, MappingNodeConstants.NORMALIZE_TEXT_PRESERVE);//$NON-NLS-1$
        ProcessorInstruction i15 = new AddNodeInstruction(descriptor, new ElementSymbol("xmltest.rs.itemQuantity")); //$NON-NLS-1$       
        ProcessorInstruction i16 = new MoveDocInstruction(MoveDocInstruction.UP);


        ProcessorInstruction i18 = new MoveDocInstruction(MoveDocInstruction.UP);
        ProcessorInstruction i19 = new MoveDocInstruction(MoveDocInstruction.UP);
        ProcessorInstruction i20 = new MoveDocInstruction(MoveDocInstruction.UP);
        ProcessorInstruction i21 = new EndDocumentInstruction();


        
        // Stitch them together


        Program program = new Program();
        program.addInstruction(i0);
        program.addInstruction(i1);
        program.addInstruction(i2);
        program.addInstruction(i3);
        program.addInstruction(i4);
        program.addInstruction(i5);
        program.addInstruction(i6);
        program.addInstruction(i7);
        program.addInstruction(i8);
        program.addInstruction(i9);


        Program whileProgram = new Program();
        i9.setBlockProgram(whileProgram);
        whileProgram.addInstruction(i10);


        Program thenProgram = new Program();
        Condition cond = new CriteriaCondition(crit, thenProgram); 
        i10.addCondition(cond);


        thenProgram.addInstruction(i11);
        thenProgram.addInstruction(i12);
        thenProgram.addInstruction(i13);
        thenProgram.addInstruction(i14);

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org.teiid.query.optimizer.xml.XMLPlanToProcessVisitor

org.teiid.query.processor.xml.TestInstructions

org.teiid.query.processor.xml.XMLProgramUtil

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