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Added ability to apply patch to existing list inplace #152

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Merged
merged 3 commits into from
Sep 1, 2022
Merged

Added ability to apply patch to existing list inplace #152

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bc1ccff
Added ability to apply patch to existing list inplace
Jul 28, 2022
ec149bd
Corrected typo 'verifyAntApplyTo'
Jul 28, 2022
c9abf48
Added restoreToExisting method as opposite to applyToExisting
Jul 28, 2022
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2 changes: 1 addition & 1 deletion java-diff-utils/src/main/java/com/github/difflib/patch/AbstractDelta.java
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,7 @@ protected VerifyChunk verifyChunkToFitTarget(List<T> target) throws PatchFailedE
return getSource().verifyChunk(target);
}

protected VerifyChunk verifyAntApplyTo(List<T> target) throws PatchFailedException {
protected VerifyChunk verifyAndApplyTo(List<T> target) throws PatchFailedException {
final VerifyChunk verify = verifyChunkToFitTarget(target);
if (verify == VerifyChunk.OK) {
applyTo(target);
Expand Down
49 changes: 38 additions & 11 deletions java-diff-utils/src/main/java/com/github/difflib/patch/Patch.java
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Original file line number Diff line number Diff line change
Expand Up @@ -48,22 +48,35 @@ public Patch(int estimatedPatchSize) {
}

/**
* Apply this patch to the given target
* Creates a new list, the patch is being applied to.
*
* @return the patched text
* @throws PatchFailedException if can't apply patch
* @param target The list to apply the changes to.
* @return A new list containing the applied patch.
* @throws PatchFailedException if the patch cannot be applied
*/
public List<T> applyTo(List<T> target) throws PatchFailedException {
List<T> result = new ArrayList<>(target);
applyToExisting(result);
return result;
}

/**
* Applies the patch to the supplied list.
*
* @param target The list to apply the changes to. This list has to be modifiable,
* otherwise exceptions may be thrown, depending on the used type of list.
* @throws PatchFailedException if the patch cannot be applied
* @throws RuntimeException (or similar) if the list is not modifiable.
*/
public void applyToExisting(List<T> target) throws PatchFailedException {
ListIterator<AbstractDelta<T>> it = getDeltas().listIterator(deltas.size());
while (it.hasPrevious()) {
AbstractDelta<T> delta = it.previous();
VerifyChunk valid = delta.verifyAntApplyTo(result);
VerifyChunk valid = delta.verifyAndApplyTo(target);
if (valid != VerifyChunk.OK) {
conflictOutput.processConflict(valid, delta, result);
conflictOutput.processConflict(valid, delta, target);
}
}
return result;
}

private static class PatchApplyingContext<T> {
Expand Down Expand Up @@ -220,19 +233,33 @@ public Patch withConflictOutput(ConflictOutput<T> conflictOutput) {
}

/**
* Restore the text to original. Opposite to applyTo() method.
* Creates a new list, containing the restored state of the given list.
* Opposite to {@link #applyTo(List)} method.
*
* @param target the given target
* @return the restored text
* @param target The list to copy and apply changes to.
* @return A new list, containing the restored state.
*/
public List<T> restore(List<T> target) {
List<T> result = new ArrayList<>(target);
restoreToExisting(result);
return result;
}


/**
* Restores all changes within the given list.
* Opposite to {@link #applyToExisting(List)} method.
*
* @param target The list to restore changes in. This list has to be modifiable,
* otherwise exceptions may be thrown, depending on the used type of list.
* @throws RuntimeException (or similar) if the list is not modifiable.
*/
public void restoreToExisting(List<T> target) {
ListIterator<AbstractDelta<T>> it = getDeltas().listIterator(deltas.size());
while (it.hasPrevious()) {
AbstractDelta<T> delta = it.previous();
delta.restore(result);
delta.restore(target);
}
return result;
}

/**
Expand Down