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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.Actions.CompleteActions;

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.Syntax.Actions.IntermediateActions.*;
import fUML.Syntax.Actions.CompleteActions.*;

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

public class ReduceActionActivation extends
		fUML.Semantics.Actions.BasicActions.ActionActivation {

	public fUML.Semantics.CommonBehaviors.BasicBehaviors.Execution currentExecution = null;

	public void doAction() {
		// Get the values of the collection input pin.
		// If the input pin has no values, then do nothing. Otherwise, do the
		// following.
		// Repeatedly invoke the reducer behavior on successive pairs to reduce
		// the collection to a single value, and place that value on the result
		// pin.
		// To invoke the reducer behavior, compile it to create an execution,
		// make the execution the current execution, place the appropriate
		// values on its input parameters, and execute it.

		ReduceAction action = (ReduceAction) (this.node);

		ValueList values = this.takeTokens(action.collection);

		if (values.size() > 0) {
			ParameterList parameters = action.reducer.ownedParameter;
			Parameter input1 = null;
			Parameter input2 = null;
			Parameter output = null;

			int i = 1;
			while (i <= parameters.size()) {
				Parameter parameter = parameters.getValue(i - 1);
				if (parameter.direction == ParameterDirectionKind.in) {
					if (input1 == null) {
						input1 = parameter;
					} else {
						input2 = parameter;
					}
				} else if (parameter.direction == ParameterDirectionKind.out
						| parameter.direction == ParameterDirectionKind.return_) {
					output = parameter;
				}
				i = i + 1;
			}

			ParameterValue parameterValue1 = new ParameterValue();
			parameterValue1.parameter = input1;
			parameterValue1.values = new ValueList();
			parameterValue1.values.addValue(values.getValue(0));

			int j = 2;
			while (j <= values.size()) {
				this.currentExecution = this.getExecutionLocus().factory
						.createExecution(action.reducer, this
								.getExecutionContext());

				this.currentExecution.setParameterValue(parameterValue1);

				ParameterValue parameterValue2 = new ParameterValue();
				parameterValue2.parameter = input2;
				parameterValue2.values = new ValueList();
				parameterValue2.values.addValue(values.getValue(j - 1));
				this.currentExecution.setParameterValue(parameterValue2);

				this.currentExecution.execute();

				parameterValue1.values = this.currentExecution
						.getParameterValue(output).values;

				j = j + 1;

				if (parameterValue1.values.isEmpty() & j <= values.size()) {
					parameterValue1.values.add(values.getValue(j - 1));
					j = j + 1;
				}

			}

			this.putTokens(action.result, parameterValue1.values);
		}
	} // doAction

	public void terminate() {
		// If there is a current execution, terminate it. Then terminate self.

		if (this.currentExecution != null) {
			this.currentExecution.terminate();
		}

		super.terminate();
	} // terminate

} // ReduceActionActivation