com.im.df.api.dml
Class Operators.ErrorOperator

java.lang.Object
  com.im.df.api.dml.DFOperator
      com.im.df.api.dml.Operators.SimpleFieldValuesOperator
          com.im.df.api.dml.Operators.ErrorOperator

Enclosing class:

Operators

public static class Operators.ErrorOperator
extends Operators.SimpleFieldValuesOperator

A special class for "ERROR" operator. This is not a real operator, but only data holder for some incorrect parts of DFTermExpressions. If there are mode UI components editing simultaneously the same query term expression and if some part is not correct, the builder can add this ERROR operator, so other UI builders can display it too.

Constructor Summary

Operators.ErrorOperator()

Method Summary

String	getToStringPart(List<DFTerm> operands, int index) Get the part of the complete DFOperator.toString(java.util.List) method result.
void	validate(DFDataTree dataTree, List<DFTerm> operands, Map<String,Object> options, TermErrors errors) Validate the operands in context of this operator.

Methods inherited from class com.im.df.api.dml.Operators.SimpleFieldValuesOperator

getReturnType, getValidFormatMsg, isEmptyStringAllowed, isFieldAcceptableAsOperand, parseOperands

Methods inherited from class com.im.df.api.dml.DFOperator

correctNumberOfOperands, getDisplayName, getDisplayNameInExpression, getMaxOperands, getMinOperands, toString, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Operators.ErrorOperator

public Operators.ErrorOperator()

Method Detail

getToStringPart

public String getToStringPart(List<DFTerm> operands,
                              int index)

Description copied from class: DFOperator

Get the part of the complete DFOperator.toString(java.util.List) method result. This method can be overriden by subclasses so each operator can provide specific form of String representation.

For example for binary operator is this method called 3 times: for indexes 0, 1 and 2. The index=0 means it's string before the first operand, index=1 is string between operands and index=2 is after the second operand. For operator LESS_THAN it should return: index=0 => "", index=1 => " less than ", and for index=2 => "".

This method allow subclass to reuse the generic code from DFOperator.toString(java.util.List) and change the own notation (e.g. "[molW %lt; 15]" => "[%lt; moW, 15]" etc.).

Overrides:

getToStringPart in class DFOperator

Parameters:

operands - The list of all operands

index - The index of String [0..operands.size()]

Returns:

The indexed part of whole DFOperator.toString(java.util.List) method.

validate

public void validate(DFDataTree dataTree,
                     List<DFTerm> operands,
                     Map<String,Object> options,
                     TermErrors errors)

Description copied from class: DFOperator

Validate the operands in context of this operator. It's up to operator to decide if it accepts the given operands or not. This method is called from DFTerm.validate(com.im.df.api.ddl.DFDataTree).

Overrides:

validate in class Operators.SimpleFieldValuesOperator

Parameters:

dataTree - The datatree where this operator will be used

operands - The list of operands

options - Options of this query term (DFTermExpression.getOptions()

errors - The errors object which contains the result of the validation