/*
 * (c) Copyright 2010-2011 AgileBirds
 *
 * This file is part of OpenFlexo.
 *
 * OpenFlexo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * OpenFlexo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with OpenFlexo. If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openflexo.foundation.wkf;

/**
 * Convenient class used to represent level of levelled objects
 * 
 * @author sguerin
 */
public abstract class FlexoLevel {

	public static final FlexoLevel WORKFLOW = new WorkflowLevel();

	public static final FlexoLevel PROCESS = new ProcessLevel();

	public static final FlexoLevel ACTIVITY = new ActivityLevel();

	public static final FlexoLevel OPERATION = new OperationLevel();

	public static final FlexoLevel ACTION = new ActionLevel();

	public static final FlexoLevel PORT = new PortLevel();

	static class WorkflowLevel extends FlexoLevel {
		@Override
		public String getName() {
			return "WORKFLOW";
		}

		@Override
		public FlexoLevel increment() {
			return PROCESS;
		}
	}

	static class ProcessLevel extends FlexoLevel {
		@Override
		public String getName() {
			return "PROCESS";
		}

		@Override
		public FlexoLevel increment() {
			return ACTIVITY;
		}
	}

	static class ActivityLevel extends FlexoLevel {
		@Override
		public String getName() {
			return "ACTIVITY";
		}

		@Override
		public FlexoLevel increment() {
			return OPERATION;
		}
	}

	static class OperationLevel extends FlexoLevel {
		@Override
		public String getName() {
			return "OPERATION";
		}

		@Override
		public FlexoLevel increment() {
			return ACTION;
		}
	}

	static class ActionLevel extends FlexoLevel {
		@Override
		public String getName() {
			return "ACTION";
		}

		@Override
		public FlexoLevel increment() {
			return null;
		}
	}

	static class PortLevel extends FlexoLevel {
		@Override
		public String getName() {
			return "PORT";
		}

		@Override
		public FlexoLevel increment() {
			return null;
		}
	}

	public abstract String getName();

	public abstract FlexoLevel increment();

	@Override
	public String toString() {
		return getName();
	}
}