er.extensions.foundation

Class ERXArrayUtilities.SubarrayWithRangeOperator

java.lang.Object

er.extensions.foundation.ERXArrayUtilities.SubarrayWithRangeOperator

All Implemented Interfaces:

NSArray.Operator

Enclosing class:

ERXArrayUtilities

public static class ERXArrayUtilities.SubarrayWithRangeOperator
extends Object

Define an NSArray.Operator for the key subarrayWithRange.

This allows for key value paths like:

myArray.valueForKeyPath("@subarrayWithRange.20-3.someOtherPath");

Which in this case would return the three objects from myArray, starting at the index of 20, before continuing to process someOtherPath.

Note that the syntax for the range argument is not startIndex-endIndex. The API matches that of NSRange. You must provide a start index and an array length.

See Also:

BaseOperator

Constructor Summary

Constructors

Constructor and Description
SubarrayWithRangeOperator()

Method Summary

Modifier and Type	Method and Description
Object	compute(NSArray array, String keypath)
Object	contents(NSArray<?> array, 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

SubarrayWithRangeOperator

public SubarrayWithRangeOperator()

Method Detail

compute

public Object compute(NSArray array,
                      String keypath)

Parameters:

array - array to truncate

keypath - the key path to follow after truncation

Returns:

the value produced by the keypath after truncating the array

contents

public Object contents(NSArray<?> array,
                       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