Class PatternChanges

code/src/java/pcgen/rules/context/PatternChanges.java:28–70

The Class PatternChanges is responsible for tracking changes to a map so that the changes can be committed or rolled back at a later stage. Items can be added to the map, removed from the map or the map can be cleared.

 * cleared.
 */
public class PatternChanges<T>
{
	private final Collection<T> positive;
	private final Collection<String> negative;
	private final boolean clear;

	public PatternChanges(Collection<T> added, Collection<String> removed, boolean globallyCleared)
	{
		positive = added;
		negative = removed;
		clear = globallyCleared;
	}

	public boolean includesGlobalClear()
	{
		return clear;
	}

	public boolean isEmpty()
	{
		return !clear && !hasAddedItems() && !hasRemovedItems();
	}

	public Collection<T> getAdded()
	{
		return positive;
	}

	public boolean hasAddedItems()
	{
		return positive != null && !positive.isEmpty();
	}

	public Collection<String> getRemoved()
	{
		return negative;
	}

	public boolean hasRemovedItems()
	{
		return negative != null && !negative.isEmpty();
	}
}