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This open source software is a reference implementation, consisting of software and related files, for the OMG specification called the Semantics of a Foundational Subset for Executable UML Models (fUML). The reference implementation is intended to implement the execution semantics of UML activity models, accepting an XMI file from a conformant UML model as its input and providing an execution trace of the selected activity model(s) as its output. The core execution engine, which is directly generated from the normative syntactic and semantic models for fUML, may also be used as a library implementation of fUML in other software.

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/*
 * Initial version copyright 2008 Lockheed Martin Corporation, except  
 * as stated in the file entitled Licensing-Information. 
 * 
 * All modifications copyright 2009-2012 Data Access Technologies, Inc.
 *
 * Licensed under the Academic Free License version 3.0 
 * (http://www.opensource.org/licenses/afl-3.0.php), except as stated 
 * in the file entitled Licensing-Information. 
 */

package fUML.Semantics.Activities.IntermediateActivities;

import fUML.Debug;
import UMLPrimitiveTypes.*;

import fUML.Syntax.*;
import fUML.Syntax.Classes.Kernel.*;
import fUML.Syntax.CommonBehaviors.BasicBehaviors.*;
import fUML.Syntax.CommonBehaviors.Communications.*;
import fUML.Syntax.Activities.IntermediateActivities.*;
import fUML.Syntax.Actions.BasicActions.*;

import fUML.Semantics.*;
import fUML.Semantics.Classes.Kernel.*;
import fUML.Semantics.CommonBehaviors.BasicBehaviors.*;
import fUML.Semantics.Actions.BasicActions.*;
import fUML.Semantics.Loci.*;

public abstract class Token extends org.modeldriven.fuml.FumlObject {

	public fUML.Semantics.Activities.IntermediateActivities.ActivityNodeActivation holder = null;

	public fUML.Semantics.Activities.IntermediateActivities.Token transfer(
			fUML.Semantics.Activities.IntermediateActivities.ActivityNodeActivation holder) {
		// if this token does not have any holder, make the given holder its
		// holder.
		// Otherwise, remove this token from its holder and return a copy of it
		// transfered to a new holder.

		Token token = this;
		if (this.holder != null) {
			this.withdraw();
			token = this.copy();
		}

		token.holder = holder;
		return token;
	} // transfer

	public void withdraw() {
		// Remove this token from its holder, withdrawing any offers for it.

		if (!this.isWithdrawn()) {
			// Debug.println("[withdraw] Taking token with value = " +
			// this.getValue());
			this.holder.removeToken(this);
			this.holder = null;
		}
	} // withdraw

	public abstract boolean equals(
			fUML.Semantics.Activities.IntermediateActivities.Token other);

	public abstract fUML.Semantics.Activities.IntermediateActivities.Token copy();

	public boolean isWithdrawn() {
		// Test if this token has been withdrawn.

		return this.holder == null;
	} // isWithdrawn

	public abstract boolean isControl();

	public abstract fUML.Semantics.Classes.Kernel.Value getValue();

} // Token