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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 ActivityParameterNodeActivation extends
		fUML.Semantics.Activities.IntermediateActivities.ObjectNodeActivation {

	public void fire(
			fUML.Semantics.Activities.IntermediateActivities.TokenList incomingTokens) {
		// If there are no incoming edges, this is an activation of an input
		// activity parameter node.
		// Get the values from the input parameter indicated by the activity
		// parameter node and offer those values as object tokens.

		if (this.node.incoming.size() == 0) {
			Debug.println("[fire] Input activity parameter node " + this.node.name + "...");
			Parameter parameter = ((ActivityParameterNode) (this.node)).parameter;
			ParameterValue parameterValue = this.getActivityExecution()
					.getParameterValue(parameter);
			// Debug.println("[fire] parameter = " + parameter.name);
			if (parameterValue != null) {
				Debug.println("[fire] Parameter has " + parameterValue.values.size() + " value(s).");
				TokenList tokens = new TokenList();
				ValueList values = parameterValue.values;
				for (int i = 0; i < values.size(); i++) {
					Value value = values.getValue(i);
					ObjectToken token = new ObjectToken();
					token.value = value;
					this.addToken(token);
				}
				this.sendUnofferedTokens();
			}
		}

		// If there are one or more incoming edges, this is an activation of an
		// output activity parameter node.
		// Take the tokens offered on incoming edges and add them to the set of
		// tokens being offered.
		// [Note that an output activity parameter node may fire multiple times,
		// accumulating tokens offered to it.]

		else {
			Debug.println("[fire] Output activity parameter node " + this.node.name + "...");
			this.addTokens(incomingTokens);
		}

	} // fire

	public void clearTokens() {
		// Clear all held tokens only if this is an input parameter node.

		if (this.node.incoming.size() == 0) {
			super.clearTokens();
		}
	} // clearTokens

} // ActivityParameterNodeActivation