Validators

• Case1: Validate from java code
• Create java class extend from javax.faces.validator
• Add the logic(implement) validate() method
• Open faces-config.xml -> validators tab ->  provide ID's to the class names
• Navigate to any attribute in .jsff page -> insert validator -> provide the validator id OR drag and drop email validator and provide regular expression 
• Case2: Validate from DB
• Create a jsp page with 2 input text fields, employeeId, employeeName
• Create a employeeVO on Employees table with a employeeID bind and view criteria with condition on bind variable
• Create a java class for the vo -  employeeViewImpl.java 
• Create application module impl class, and create 2 methods - validateEmployeeID & validateEmployeeName

public boolean validateEmployeeId(int empId){
     EmployeeViewImpl emp = getEmployeeView1();
     emp.setApplyViewCriteriaName("findEmpByIdCriteria");
     emp.setNamedWhereClauseParam("b_employeeId",empId);
    emp.executeQuery();
      if (emp.getRowCount()>0){
          return true;
       } else { return false;
}
}

• Expose the methods to client interface in AM
• Crete Validator java classes extending from javax.faces.validator
• Add following method to Validator class

public boolean getMethodResult(int empId){
  OperationBinding oper = ADFUtils.findOperation("validateEmployeeId); //binding
  oper.getParamMap().put("empId",empId);
  Object result = oper.execute();
  return Boolean.valueOf(oper.getResult().toString());
}
}

• call getMethodResult from validate() -> throw ValidatorException if method returns false
• Add the validator class files as Managed beans in adfc-config.xml
• Navigate to jsff, input text field, set validator property of the filed to managed bean validate method.
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