/*******************************************************************************
* Copyright (c) 2006-2012
* Software Technology Group, Dresden University of Technology
* DevBoost GmbH, Berlin, Amtsgericht Charlottenburg, HRB 140026
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Software Technology Group - TU Dresden, Germany;
* DevBoost GmbH - Berlin, Germany
* - initial API and implementation
******************************************************************************/
/**
*
*/
package org.reuseware.coconut.description.classify.derive;
import java.util.Collections;
import java.util.List;
import org.eclipse.ocl.ParserException;
import org.eclipse.ocl.ecore.OCL;
import org.eclipse.ocl.ecore.OCLExpression;
import org.eclipse.ocl.ecore.OCL.Helper;
import org.eclipse.ocl.ecore.OCL.Query;
import org.reuseware.coconut.description.DerivationData;
import org.reuseware.coconut.description.DirectDerivation;
import org.reuseware.coconut.description.Facet;
import org.reuseware.coconut.description.FacetType;
import org.reuseware.coconut.description.FacetValue;
import org.reuseware.coconut.description.classify.FacetManager;
import org.reuseware.coconut.fragment.Fragment;
import org.reuseware.coconut.fragment.FragmentPackage;
import org.reuseware.coconut.reuseextension.util.ocl.EnhancedEcoreEnvironmentFactory;
/**
* @author Matthias Schmidt
*
*/
public class DirectDerivator extends Derivator {
private static final OCL OCL_ENV = OCL.newInstance(new EnhancedEcoreEnvironmentFactory());
/*
* (non-Javadoc)
*
* @see
* org.reuseware.coconut.description.classify.derivate.Derivator#derive(
* org.reuseware.coconut.fragment.Fragment)
*/
@Override
public Facet derive(Fragment subject, FacetType facetType) {
if (!(facetType.getDerivationData() instanceof DirectDerivation))
return null;
String rule = ((DirectDerivation) facetType.getDerivationData())
.getRule();
System.out.println("Rule: " + rule);
List<FacetValue> values = performDerivation(subject, facetType);
return buildFacet(facetType, values);
}
private List<FacetValue> performDerivation(Fragment subject,
FacetType facetType) {
DerivationData derivationData = facetType.getDerivationData();
String valueAsString = null;
if (derivationData instanceof DirectDerivation) {
DirectDerivation directDerivation = (DirectDerivation) derivationData;
String rule = directDerivation.getRule();
OCLExpression oclExpression = parse(rule);
if (oclExpression == null)
return Collections.emptyList();
Query query = OCL_ENV.createQuery(oclExpression);
Object result = null;
try {
result = query.evaluate(subject);
} catch (Exception e) {
e.printStackTrace();
result = null;
}
valueAsString = result.toString();
FacetValue derivedValue = null;
for(FacetValue value : facetType.getValues()) {
if (value.getName().equals(valueAsString)) {
derivedValue = value;
break;
}
}
if (derivedValue == null) {
derivedValue = FacetManager.buildFacetValue(valueAsString,
null, null, null);
facetType.getValues().add(derivedValue);
}
return Collections.singletonList(derivedValue);
}
return Collections.emptyList();
}
private static OCLExpression parse(String expression) {
if (expression == null)
return null;
OCLExpression oclExpression = null;
Helper helper = OCL_ENV.createOCLHelper();
helper.setContext(FragmentPackage.Literals.FRAGMENT);
try {
oclExpression = helper.createQuery(expression);
} catch (ParserException e) {
System.err.println(e.getLocalizedMessage());
}
return oclExpression;
}
/*
* (non-Javadoc)
*
* @see
* org.reuseware.coconut.description.classify.derivate.Derivator#getID()
*/
@Override
public String getID() {
return DerivationManager.ID_DirectDerivator;
}
}