Examples of com.odiago.flumebase.exec.EmptyEventWrapper

com.odiago.flumebase.exec.EmptyEventWrapper
An EventWrapper instance that wraps no actual data; it returns null for all fields. It is intended to be passed to Expr.eval() methods which are guaranteed to be constant, and should not depend on any per-record state. The getField() method throws IOException for all requests.


    WindowSpec window = null;
    try {
      // This should evaluate to itself, but make sure to resolve it anyway.
      assert mWindowExpr.isConstant();
      window = (WindowSpec) mWindowExpr.eval(new EmptyEventWrapper());
    } catch (IOException ioe) {
      // mWindowExpr should be constant, so this should be impossible.
      LOG.error("IOException calculating window expression: " + ioe);
      // Signal error by returning a null flow specification anyway.
      planContext.setFlowSpec(null);

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  @Override
  public String toStringOneLine() {
    StringBuilder sb = new StringBuilder();
    sb.append("RANGE(From=");
    try {
      sb.append(mPrevSize.eval(new EmptyEventWrapper()));
    } catch (IOException ioe) {
      sb.append("???");
    }
    sb.append(" ");
    sb.append(mPrevScale);
    sb.append(", To=");
    try {
      sb.append(mAfterSize.eval(new EmptyEventWrapper()));
    } catch (IOException ioe) {
      sb.append("???");
    }
    sb.append(" ");
    sb.append(mAfterScale);

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Related Classes of com.odiago.flumebase.exec.EmptyEventWrapper

com.odiago.flumebase.parser.JoinedSource

com.odiago.flumebase.parser.RangeSpec

java.io.IOException

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