Examples of com.sun.codemodel.JExpression

com.sun.codemodel.JExpression
A Java expression.
Unlike most of CodeModel, JExpressions are built bottom-up ( meaning you start from leaves and then gradually build compliated expressions by combining them.)
{@link JExpression} defines a series of composer methods,which returns a complicated expression (by often taking other {@link JExpression}s as parameters. For example, you can build "5+2" by JExpr.lit(5).add(JExpr.lit(2))

        throws RuntimeException {
      MajorType majorType = e.getMajorType();
      JBlock setup = generator.getBlock(BlockType.SETUP);
      JType holderType = generator.getHolderType(majorType);
      JVar var = generator.declareClassField("dec38", holderType);
      JExpression stringLiteral = JExpr.lit(e.getBigDecimal().toString());
      setup.assign(var,
          generator.getModel().ref(ValueHolderHelper.class).staticInvoke("getVarCharHolder").arg(stringLiteral));
      return new HoldingContainer(majorType, var, null, null);
    }

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      JBlock eval = generator.getEvalBlock().block();  // enter into nested block
      generator.nestEvalBlock(eval);


      HoldingContainer arg = null;
      
      JExpression e = null;
      
      //  value of boolean "and" when one side is null
      //    p       q     p and q
      //    true    null     null
      //    false   null     false
      //    null    true     null
      //    null    false    false
      //    null    null     null
      for (int i = 0; i < op.args.size(); i++) {
        arg = op.args.get(i).accept(this, generator);
        
        JBlock earlyExit = null;
        if (arg.isOptional()) {
          earlyExit = eval._if(arg.getIsSet().eq(JExpr.lit(1)).cand(arg.getValue().ne(JExpr.lit(1))))._then();          
          if(e == null){
            e = arg.getIsSet();
          }else{
            e = e.mul(arg.getIsSet());
          }            
        } else {
          earlyExit = eval._if(arg.getValue().ne(JExpr.lit(1)))._then();               
        }
        
        if (out.isOptional()) {
          earlyExit.assign(out.getIsSet(), JExpr.lit(1));
        } 
        
        earlyExit.assign(out.getValue(),  JExpr.lit(0));             
        earlyExit._break(label);            
      }
      
      if (out.isOptional()) {
        assert (e != null);
        
        JConditional notSetJC = eval._if(e.eq(JExpr.lit(0)));
        notSetJC._then().assign(out.getIsSet(), JExpr.lit(0));
        
        JBlock setBlock = notSetJC._else().block();
        setBlock.assign(out.getIsSet(), JExpr.lit(1));
        setBlock.assign(out.getValue(), JExpr.lit(1));

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      JBlock eval = generator.getEvalBlock().block();
      generator.nestEvalBlock(eval);   // enter into nested block. 


      HoldingContainer arg = null;
      
      JExpression e = null;


      //  value of boolean "or" when one side is null
      //    p       q       p and q
      //    true    null     true
      //    false   null     null
      //    null    true     true
      //    null    false    null
      //    null    null     null
      
      for (int i = 0; i < op.args.size(); i++) {
        arg = op.args.get(i).accept(this, generator);
        
        JBlock earlyExit = null;
        if (arg.isOptional()) {
          earlyExit = eval._if(arg.getIsSet().eq(JExpr.lit(1)).cand(arg.getValue().eq(JExpr.lit(1))))._then();          
          if(e == null){
            e = arg.getIsSet();
          }else{
            e = e.mul(arg.getIsSet());
          }            
        } else {
          earlyExit = eval._if(arg.getValue().eq(JExpr.lit(1)))._then();               
        }
        
        if (out.isOptional()) {
          earlyExit.assign(out.getIsSet(), JExpr.lit(1));
        } 
        
        earlyExit.assign(out.getValue(),  JExpr.lit(1));             
        earlyExit._break(label);            
      }
      
      if (out.isOptional()) {
        assert (e != null);
        
        JConditional notSetJC = eval._if(e.eq(JExpr.lit(0)));
        notSetJC._then().assign(out.getIsSet(), JExpr.lit(0));
        
        JBlock setBlock = notSetJC._else().block();
        setBlock.assign(out.getIsSet(), JExpr.lit(1));
        setBlock.assign(out.getValue(), JExpr.lit(0));

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public class CopyUtil {
  public static void generateCopies(ClassGenerator g, VectorAccessible batch, boolean hyper){
    // we have parallel ids for each value vector so we don't actually have to deal with managing the ids at all.
    int fieldId = 0;


    JExpression inIndex = JExpr.direct("inIndex");
    JExpression outIndex = JExpr.direct("outIndex");
    for(VectorWrapper<?> vv : batch) {
      g.rotateBlock();
      JVar inVV = g.declareVectorValueSetupAndMember("incoming", new TypedFieldId(vv.getField().getType(), vv.isHyper(), fieldId));
      JVar outVV = g.declareVectorValueSetupAndMember("outgoing", new TypedFieldId(vv.getField().getType(), false, fieldId));

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        // Generate the code to project build side records
        g.setMappingSet(projectBuildMapping);




        int fieldId = 0;
        JExpression buildIndex = JExpr.direct("buildIndex");
        JExpression outIndex = JExpr.direct("outIndex");
        g.rotateBlock();


        if (hyperContainer != null) {
            for(VectorWrapper<?> vv : hyperContainer) {


                MajorType inputType = vv.getField().getType();
                MajorType outputType;
                if (joinType == JoinRelType.LEFT && inputType.getMode() == DataMode.REQUIRED) {
                  outputType = Types.overrideMode(inputType, DataMode.OPTIONAL);
                } else {
                  outputType = inputType;
                }


                // Add the vector to our output container
                ValueVector v = TypeHelper.getNewVector(MaterializedField.create(vv.getField().getPath(), outputType), context.getAllocator());
                container.add(v);


                JVar inVV = g.declareVectorValueSetupAndMember("buildBatch", new TypedFieldId(vv.getField().getType(), true, fieldId));
                JVar outVV = g.declareVectorValueSetupAndMember("outgoing", new TypedFieldId(outputType, false, fieldId));
                g.getEvalBlock()._if(outVV.invoke("copyFromSafe")
                  .arg(buildIndex.band(JExpr.lit((int) Character.MAX_VALUE)))
                  .arg(outIndex)
                  .arg(inVV.component(buildIndex.shrz(JExpr.lit(16)))).not())._then()._return(JExpr.FALSE);


                fieldId++;
            }
        }
        g.rotateBlock();
        g.getEvalBlock()._return(JExpr.TRUE);


        // Generate the code to project probe side records
        g.setMappingSet(projectProbeMapping);


        int outputFieldId = fieldId;
        fieldId = 0;
        JExpression probeIndex = JExpr.direct("probeIndex");
        int recordCount = 0;


        if (leftUpstream == IterOutcome.OK || leftUpstream == IterOutcome.OK_NEW_SCHEMA) {
            for (VectorWrapper<?> vv : left) {

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          "Failure while trying to materialize incoming schema.  Errors:\n %s.",
          collector.toErrorString()));
    }


    // generate code to copy from an incoming value vector to the destination partition's outgoing value vector
    JExpression bucket = JExpr.direct("bucket");


    // generate evaluate expression to determine the hash
    ClassGenerator.HoldingContainer exprHolder = cg.addExpr(materializedExpr);
    cg.getEvalBlock().decl(JType.parse(cg.getModel(), "int"), "bucket", exprHolder.getValue().mod(JExpr.lit(outGoingBatchCount)));
    cg.getEvalBlock()._return(cg.getModel().ref(Math.class).staticInvoke("abs").arg(bucket));

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  }


  @Nonnull
  @Override
  public Expressions createReadFromDeserializeFromExpression( @Nonnull AbstractGenerator<?> generator, @Nonnull JDefinedClass serializerClass, @Nonnull JExpression deserializeFrom, JVar wrapper, @Nonnull JVar formatVersion, @Nonnull FieldDeclarationInfo fieldInfo ) {
    JExpression readExpression = createReadExpression( serializerClass, deserializeFrom, formatVersion, fieldInfo );


    return new Expressions( codeGenerator.getParseExpressionFactory().createParseExpression( readExpression, fieldInfo ) );
  }

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    assert wrapper != null;


    JFieldVar constant = getConstant( serializerClass, fieldInfo );
    JStatement nextFieldStatement = wrapper.invoke( "nextFieldValue" ).arg( constant );


    JExpression readExpression = createReadExpression( serializerClass, deserializeFrom, formatVersion, fieldInfo );
    return new Expressions( readExpression, nextFieldStatement );
  }

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  }


  @NotNull
  @Override
  public Expressions createReadFromDeserializeFromExpression( @NotNull AbstractGenerator<?> generator, @NotNull JDefinedClass serializerClass, @NotNull JExpression deserializeFrom, @NotNull JVar formatVersion, @NotNull FieldDeclarationInfo fieldInfo ) {
    JExpression readExpression = createReadExpression( serializerClass, deserializeFrom, formatVersion, fieldInfo );


    return new Expressions( codeGenerator.getParseExpressionFactory().createParseExpression( readExpression, fieldInfo ) );
  }

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  @Override
  public Expressions createReadFromDeserializeFromExpression( @NotNull AbstractGenerator<?> generator, @NotNull JDefinedClass serializerClass, @NotNull JExpression deserializeFrom, @NotNull JVar formatVersion, @NotNull FieldDeclarationInfo fieldInfo ) {
    JFieldVar constant = getConstant( serializerClass, fieldInfo );
    JStatement nextFieldStatement = JExpr.invoke( "nextFieldValue" ).arg( deserializeFrom ).arg( constant );


    JExpression readExpression = createReadExpression( serializerClass, deserializeFrom, formatVersion, fieldInfo );
    return new Expressions( readExpression, nextFieldStatement );
  }

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