Bug 182714 [Contributions] Improve toolbar configurability
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ContributionManager.java
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.util.Policy;
/**
 * Abstract base class for all contribution managers, and standard
 * implementation of <code>IContributionManager</code>. This class provides
 * functionality common across the specific managers defined by this framework.
 * <p>
 * This class maintains a list of contribution items and a dirty flag, both as
 * internal state. In addition to providing implementations of most
 * <code>IContributionManager</code> methods, this class automatically
 * coalesces adjacent separators, hides beginning and ending separators, and
 * deals with dynamically changing sets of contributions. When the set of
 * contributions does change dynamically, the changes are propagated to the
 * control via the <code>update</code> method, which subclasses must
 * implement.
 * </p>
 * <p>
 * Note: A <code>ContributionItem</code> cannot be shared between different
 * <code>ContributionManager</code>s.
 * </p>
 */
public abstract class ContributionManager implements IContributionManager {
	
	
	/**
	 * The list of contribution items.
	 */
	private List contributions = new ArrayList();
	/**
	 * Indicates whether the widgets are in sync with the contributions.