org.datanucleus.query.evaluator.memory
Class TrimFunctionEvaluator

java.lang.Object
  org.datanucleus.query.evaluator.memory.TrimFunctionEvaluator

All Implemented Interfaces:

InvocationEvaluator

public class TrimFunctionEvaluator
extends java.lang.Object
implements InvocationEvaluator

Evaluator for the function TRIM(strExpr). If the method is TRIM trims both ends. If the method is TRIM_LEADING trims just the start. If the method is TRIM_TRAILING trims just the end. The first parameter of the expression is the string to trim. An optional second parameter is the trim character to trim (default to ' ' if not specified).

Field Summary

protected static Localiser

LOCALISER Localisation utility for output messages

Constructor Summary

TrimFunctionEvaluator()

Method Summary

java.lang.Object	evaluate(InvokeExpression expr, java.lang.Object invokedValue, InMemoryExpressionEvaluator eval) Method to evaluate the InvokeExpression, as part of the overall evaluation defined by the InMemoryExpressionEvaluator.
boolean	supportsType(java.lang.Class cls) Accessor for whether this evaluator supports invocation of this method on the specified type.

Methods inherited from class java.lang.Object

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

Field Detail

LOCALISER

protected static final Localiser LOCALISER

Localisation utility for output messages

Constructor Detail

TrimFunctionEvaluator

public TrimFunctionEvaluator()

Method Detail

evaluate

public java.lang.Object evaluate(InvokeExpression expr,
                                 java.lang.Object invokedValue,
                                 InMemoryExpressionEvaluator eval)

Description copied from interface: InvocationEvaluator

Method to evaluate the InvokeExpression, as part of the overall evaluation defined by the InMemoryExpressionEvaluator.

Specified by:

evaluate in interface InvocationEvaluator

Parameters:

expr - The expression for invocation

invokedValue - Value on which we are invoking

eval - The overall evaluator for in-memory

Returns:

The result

supportsType

public boolean supportsType(java.lang.Class cls)

Description copied from interface: InvocationEvaluator

Accessor for whether this evaluator supports invocation of this method on the specified type.

Specified by:

supportsType in interface InvocationEvaluator

Parameters:

cls - Type to check

Returns:

Whether it is supported.