Check if property exist in Record Manipulator

Many times there is requirement to check if a property exist or not and based on that perform some logic or the other in the pipeline.

In this example we are going to create a Record Manipulator which check

• Existence of property “demoProperty” and if it does not exist create one.
• Else if “demoProperty” is empty add a default value to it.

Below is what we need to add to our Record Manipulator

<EXPRESSION TYPE="VOID" NAME="IF"> 
  <EXPRESSION TYPE="INTEGER" NAME="MATH">
    <EXPRNODE NAME="TYPE" VALUE="STRING"/> 
    <EXPRNODE NAME="OPERATOR" VALUE="EQUAL"/> 
    <EXPRESSION TYPE="INTEGER" NAME="PROP_EXISTS">
      <EXPRNODE NAME="PROP_NAME" VALUE="demoProperty"/> 
    </EXPRESSION>
    <EXPRESSION TYPE="INTEGER" NAME="CONST"> 
      <EXPRNODE NAME="VALUE" VALUE="0"/>
    </EXPRESSION> 
  </EXPRESSION>
  <EXPRESSION NAME="CREATE" TYPE="VOID">
    <EXPRNODE NAME="PROP_NAME" VALUE="demoProperty"/> 
    <EXPRESSION NAME="IDENTITY" TYPE="PROPERTY">
      <EXPRNODE NAME="PROP_NAME" VALUE="demoValue"/>
    </EXPRESSION> 
  </EXPRESSION>
  
  <EXPRNODE NAME="ELSE_IF" VALUE=""/> 
  <EXPRESSION TYPE="INTEGER" NAME="MATH">
    <EXPRNODE NAME="TYPE" VALUE="STRING"/> 
    <EXPRNODE NAME="OPERATOR" VALUE="EQUAL"/> 
    <EXPRESSION TYPE="PROPERTY" NAME="IDENTITY">
      <EXPRNODE NAME="PROP_NAME" VALUE="demoProperty"/> 
    </EXPRESSION>
    <EXPRESSION TYPE="STRING" NAME="CONST"> 
    <EXPRNODE NAME="VALUE" VALUE=""/>
    </EXPRESSION> 
  </EXPRESSION>
  <EXPRESSION NAME="UPDATE" TYPE="VOID">
    <EXPRNODE NAME="PROP_NAME" VALUE="demoProperty"/> 
    <EXPRESSION NAME="IDENTITY" TYPE="PROPERTY">
      <EXPRNODE NAME="PROP_NAME" VALUE="demoValue"/> 
    </EXPRESSION>
  </EXPRESSION> 
</EXPRESSION>