net.sergeych.diff

Class ListDelta<T,U>

java.lang.Object

net.sergeych.diff.Delta

net.sergeych.diff.ListDelta<T,U>

public class ListDelta<T,U>
extends Delta

Method Summary

Modifier and Type	Method and Description
void	addChange(int atIndex, Delta change)
static <T,U> Delta	compare(Delta parent, java.util.List<T> tt, java.util.List<U> uu) Compare two List instances.
Delta	getChange(int index) Get a change for a given index.
java.util.Map<java.lang.Integer,Delta>	getChanges() Get all changes as a map where key is an index of changed item and a value is a Delta instance describing the change.
boolean	isEmpty()

Methods inherited from class net.sergeych.diff.Delta

between, getNestedDelta, getParent, newValue, oldValue, registerInParent

Methods inherited from class java.lang.Object

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

Method Detail

getChanges

public java.util.Map<java.lang.Integer,Delta> getChanges()

Get all changes as a map where key is an index of changed item and a value is a Delta instance describing the change.

Returns:

map of changes.

compare

public static <T,U> Delta compare(Delta parent,
                                  java.util.List<T> tt,
                                  java.util.List<U> uu)

Compare two List instances. Note that current implementation assumes position-dependent array, not set, does not look for minimal delta, e.g. if the first element is popped (all attay shifted) it will provide attay of ChangedItem instances and RemovedItem for the last element, what is not exactly right for arrays used as sets. We strongly recommend using hash-based sets.

Type Parameters:

T -

U -

Parameters:

parent -

tt -

uu -

Returns:

the ListDelta instance or null if lists appears to be equal

addChange

public void addChange(int atIndex,
                      Delta change)

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in class Delta

Returns:

true if the difference is not found. This is internal function to be implemented by subclasses.

getChange

public Delta getChange(int index)

Get a change for a given index.

Parameters:

index - integer index value

Returns:

Delta instance of null if the values at the specified index were not changed