er.extensions.foundation
Class ERXArrayUtilities.RemoveNullValuesOperator

java.lang.Object
  er.extensions.foundation.ERXArrayUtilities.RemoveNullValuesOperator

All Implemented Interfaces:

com.webobjects.foundation.NSArray.Operator

Enclosing class:

ERXArrayUtilities

public static class ERXArrayUtilities.RemoveNullValuesOperator
extends java.lang.Object

Define an NSArray.Operator for the key removeNullValues.

This allows for key value paths like:

myArray.valueForKeyPath("@removeNullValues.someOtherPath");

Which in this case would remove the occurrences of NSKeyValueCoding.Null from myArray before continuing to process someOtherPath.

See Also:

BaseOperator

Constructor Summary

ERXArrayUtilities.RemoveNullValuesOperator()
public empty constructor

Method Summary

java.lang.Object	compute(com.webobjects.foundation.NSArray<?> array, java.lang.String keypath) Removes null values from the given array.
java.lang.Object	contents(com.webobjects.foundation.NSArray<?> array, java.lang.String keypath) Rather than iterating through the array argument calling valueForKeyPath on each array object, this method operates by calling valueForKeyPath on the array argument instead.

Methods inherited from class java.lang.Object

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

Constructor Detail

ERXArrayUtilities.RemoveNullValuesOperator

public ERXArrayUtilities.RemoveNullValuesOperator()

public empty constructor

Method Detail

compute

public java.lang.Object compute(com.webobjects.foundation.NSArray<?> array,
                                java.lang.String keypath)

Removes null values from the given array.

Parameters:

array - array to be filtered.

keypath - the key path to follow after filtering

Returns:

the value produced by following keypath after filtering nulls from the array

contents

public java.lang.Object contents(com.webobjects.foundation.NSArray<?> array,
                                 java.lang.String keypath)

Rather than iterating through the array argument calling valueForKeyPath on each array object, this method operates by calling valueForKeyPath on the array argument instead. This method is used by Wonder operators to chain multiple array operators in a single key path.

Parameters:

array - the array value for the operator

keypath - the keypath to call on the array argument

Returns:

the object value produced by valueForKeyPath, or the array itself if the keypath is empty