public static void read()

in exec/java-exec/src/main/java/org/apache/drill/exec/expr/GetSetVectorHelper.java [45:130]
80 lines of code
31 McCabe index (conditional complexity)

  public static void read(MajorType type, JExpression vector, JBlock eval, HoldingContainer out, JCodeModel model,
      JExpression indexVariable) {

    JInvocation getValueAccessor = vector.invoke("getAccessor");

    switch(type.getMode()){
      case OPTIONAL:
        eval.assign(out.getIsSet(), getValueAccessor.invoke("isSet").arg(indexVariable));
        eval = eval._if(out.getIsSet().eq(JExpr.lit(1)))._then();
        // fall through

      case REQUIRED:
        switch (type.getMinorType()) {
          case BIGINT:
          case FLOAT4:
          case FLOAT8:
          case INT:
          case MONEY:
          case SMALLINT:
          case TINYINT:
          case UINT1:
          case UINT2:
          case UINT4:
          case UINT8:
          case INTERVALYEAR:
          case DATE:
          case TIME:
          case TIMESTAMP:
          case BIT:
            eval.assign(out.getValue(), getValueAccessor.invoke("get").arg(indexVariable));
            return;
          case DECIMAL9:
          case DECIMAL18:
            eval.assign(out.getHolder().ref("scale"), vector.invoke("getField").invoke("getScale"));
            eval.assign(out.getHolder().ref("precision"), vector.invoke("getField").invoke("getPrecision"));
            eval.assign(out.getValue(), getValueAccessor.invoke("get").arg(indexVariable));
            return;
          case DECIMAL28DENSE:
          case DECIMAL28SPARSE:
          case DECIMAL38DENSE:
          case DECIMAL38SPARSE:
            eval.assign(out.getHolder().ref("scale"), vector.invoke("getField").invoke("getScale"));
            eval.assign(out.getHolder().ref("precision"), vector.invoke("getField").invoke("getPrecision"));
            eval.assign(out.getHolder().ref("start"), JExpr.lit(TypeHelper.getSize(type)).mul(indexVariable));
            eval.assign(out.getHolder().ref("buffer"), vector.invoke("getBuffer"));
            return;
          case VARDECIMAL: {
            eval.assign(out.getHolder().ref("buffer"), vector.invoke("getBuffer"));
            JVar se = eval.decl(model.LONG, "startEnd", getValueAccessor.invoke("getStartEnd").arg(indexVariable));
            eval.assign(out.getHolder().ref("start"), JExpr.cast(model._ref(int.class), se));
            eval.assign(out.getHolder().ref("end"), JExpr.cast(model._ref(int.class), se.shr(JExpr.lit(32))));
            eval.assign(out.getHolder().ref("scale"), vector.invoke("getField").invoke("getScale"));
            eval.assign(out.getHolder().ref("precision"), vector.invoke("getField").invoke("getPrecision"));
            return;
          }
          case INTERVAL: {
            JVar start = eval.decl(model.INT, "start", JExpr.lit(TypeHelper.getSize(type)).mul(indexVariable));
            JVar data = eval.decl(model.ref(DrillBuf.class), "data", vector.invoke("getBuffer"));
            eval.assign(out.getHolder().ref("months"), data.invoke("getInt").arg(start));
            eval.assign(out.getHolder().ref("days"), data.invoke("getInt").arg(start.plus(JExpr.lit(4))));
            eval.assign(out.getHolder().ref("milliseconds"), data.invoke("getInt").arg(start.plus(JExpr.lit(8))));
            return;
          }
          case INTERVALDAY: {
            JVar start = eval.decl(model.INT, "start", JExpr.lit(TypeHelper.getSize(type)).mul(indexVariable));
            eval.assign(out.getHolder().ref("days"), vector.invoke("getBuffer").invoke("getInt").arg(start));
            eval.assign(out.getHolder().ref("milliseconds"), vector.invoke("getBuffer").invoke("getInt").arg(start.plus(JExpr.lit(4))));
            return;
          }
          case VAR16CHAR:
          case VARBINARY:
          case VARCHAR: {
             eval.assign(out.getHolder().ref("buffer"), vector.invoke("getBuffer"));
             JVar se = eval.decl(model.LONG, "startEnd", getValueAccessor.invoke("getStartEnd").arg(indexVariable));
             eval.assign(out.getHolder().ref("start"), JExpr.cast(model._ref(int.class), se));
             eval.assign(out.getHolder().ref("end"), JExpr.cast(model._ref(int.class), se.shr(JExpr.lit(32))));
            return;
          }
          default:
        }
      default:
    }

    // fallback.
    eval.add(getValueAccessor.invoke("get").arg(indexVariable).arg(out.getHolder()));
  }