er.extensions.foundation
Class ERXArrayUtilities.LimitOperator

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

All Implemented Interfaces:

com.webobjects.foundation.NSArray.Operator

Enclosing class:

ERXArrayUtilities

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

Define an NSArray.Operator for the key limit, which is similar to subarrayWithRange except it is always from 0 to the limit value. If the limit specified is larger than the size of the array, the entire array will be returned.
This allows for key value paths like:

myArray.valueForKeyPath("@limit.10.someOtherPath");

Which in this case would return the first 10 objects in myArray before continuing to process someOtherPath.

See Also:

BaseOperator

Constructor Summary

ERXArrayUtilities.LimitOperator()
Constructs a new LimitOperator

Method Summary

java.lang.Object	compute(com.webobjects.foundation.NSArray<?> array, java.lang.String keypath) Computes the subarray of 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.LimitOperator

public ERXArrayUtilities.LimitOperator()

Constructs a new LimitOperator

Method Detail

compute

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

Computes the subarray of the given array.

Parameters:

array - array to be truncated.

keypath - the key path to follow after truncation.

Returns:

the value produced by following the keypath after truncation.

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