Class CollectionChanges

code/src/java/pcgen/rules/context/CollectionChanges.java:22–70

import java.util.Collection;

class CollectionChanges<T> implements Changes<T>
{
	private final Collection<T> positive;
	private final Collection<T> negative;
	private final boolean clear;

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

	@Override
	public boolean includesGlobalClear()
	{
		return clear;
	}

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

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

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

	@Override
	public Collection<T> getRemoved()
	{
		return negative;
	}

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