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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 class ForkedToken extends
		fUML.Semantics.Activities.IntermediateActivities.Token {

	public fUML.Semantics.Activities.IntermediateActivities.Token baseToken = null;
	public int remainingOffersCount = 0;
	public boolean baseTokenIsWithdrawn = false;

	public boolean isControl() {
		// Test if the base token is a control token.

		return this.baseToken.isControl();
	} // isControl

	public void withdraw() {
		// If the base token is not withdrawn, then withdraw it.
		// Decrement the remaining offers count.
		// When the remaining number of offers is zero, then remove this token
		// from its holder.

		if (!this.baseTokenIsWithdrawn & !this.baseToken.isWithdrawn()) {
			this.baseToken.withdraw();

			// NOTE: This keeps a base token that is a forked token from being
			// withdrawn more than once, since withdrawing a forked token may
			// not actually remove it from its fork node holder.
			this.baseTokenIsWithdrawn = true;
		}

		if (this.remainingOffersCount > 0) {
			this.remainingOffersCount = this.remainingOffersCount - 1;
		}

		if (this.remainingOffersCount == 0) {
			super.withdraw();
		}
	} // withdraw

	public fUML.Semantics.Activities.IntermediateActivities.Token copy() {
		// Return a copy of the base token.

		return this.baseToken.copy();
	} // copy

	public boolean equals(
			fUML.Semantics.Activities.IntermediateActivities.Token otherToken) {
		// Test if this token is equal to another token.

		return this == otherToken;
	} // equals

	public fUML.Semantics.Classes.Kernel.Value getValue() {
		// Return the value of the base token.

		return this.baseToken.getValue();
	} // getValue

} // ForkedToken