| /******************************************************************************* |
| * Copyright (c) 2009, 2018 SAP AG and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v2.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v20.html |
| * |
| * Contributors: |
| * SAP AG - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.ocl.examples.impactanalyzer.instanceScope; |
| |
| import java.util.Set; |
| |
| import org.eclipse.emf.ecore.EClass; |
| import org.eclipse.ocl.ecore.OCLExpression; |
| import org.eclipse.ocl.examples.impactanalyzer.util.SemanticIdentity; |
| |
| |
| /** |
| * A navigation step that branches in several paths and combines the results into one. As hashCode and equals |
| * depend on the subordinate steps, steps of this class register as {@link HashCodeChangeListener} on each |
| * contained step and propagate the event correspondingly. The hash code combination for the subordinate |
| * steps, once computed, is cached and updated when subordinate steps send hash code change events. |
| */ |
| public abstract class CompositeNavigationStep extends AbstractNavigationStep implements HashCodeChangeListener { |
| private final NavigationStep[] steps; |
| private int cachedXorOfStepHashCodes; |
| private final SemanticIdentity semanticIdentity; |
| |
| public CompositeNavigationStep(EClass sourceType, EClass targetType, OCLExpression debugInfo, NavigationStep... steps) { |
| super(sourceType, targetType, debugInfo); |
| this.steps = steps; |
| for (NavigationStep step : steps) { |
| cachedXorOfStepHashCodes ^= step.hashCode(); |
| step.addHashCodeChangeListener(this); |
| } |
| semanticIdentity = new CompositeNavigationStepIdentity(); |
| } |
| |
| private class CompositeNavigationStepIdentity extends SemanticIdentity { |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || hashCode() != o.hashCode()) { |
| return false; |
| } |
| if(o instanceof CompositeNavigationStep){ |
| NavigationStep[] otherSteps = ((CompositeNavigationStepIdentity) o).getNavigationStep().getSteps(); |
| |
| if(otherSteps.length != steps.length){ |
| return false; |
| } |
| |
| for(int i = 0; i < steps.length; i++){ |
| SemanticIdentity thisSubStepIdentity = steps[i].getSemanticIdentity(); |
| SemanticIdentity otherSubStepIdentity = otherSteps[i].getSemanticIdentity(); |
| if(!thisSubStepIdentity.equals(otherSubStepIdentity)){ |
| return false; |
| } |
| } |
| |
| return true; |
| }else{ |
| return false; |
| } |
| } |
| |
| @Override |
| public int calculateHashCode() { |
| int hashCode = getSemanticIdentityOfSuper().hashCode(); |
| hashCode = hashCode ^ cachedXorOfStepHashCodes; |
| return hashCode; |
| } |
| |
| public CompositeNavigationStep getNavigationStep() { |
| return CompositeNavigationStep.this; |
| } |
| |
| @Override |
| public NavigationStep getStep() { |
| return getNavigationStep(); |
| } |
| } |
| |
| private SemanticIdentity getSemanticIdentityOfSuper(){ |
| return super.getSemanticIdentity(); |
| } |
| |
| protected SemanticIdentity getSemanticIdentityOfAbstractNavigationStep(){ |
| return super.getSemanticIdentity(); |
| } |
| |
| public NavigationStep[] getSteps() { |
| return steps; |
| } |
| |
| public void beforeHashCodeChange(NavigationStep step, int token) { |
| fireBeforeHashCodeChange(token); |
| cachedXorOfStepHashCodes ^= step.hashCode(); |
| } |
| |
| public void afterHashCodeChange(NavigationStep step, int token) { |
| cachedXorOfStepHashCodes ^= step.hashCode(); |
| fireAfterHashCodeChange(token); |
| } |
| |
| /** |
| * The default size in particular for atomic navigation steps is <tt>1</tt>. |
| */ |
| @Override |
| protected int size(Set<NavigationStep> visited) { |
| int result = 0; |
| if (!visited.contains(this)) { |
| visited.add(this); |
| result++; |
| for (NavigationStep step : steps) { |
| result += ((AbstractNavigationStep) step).size(visited); |
| } |
| } |
| return result; |
| } |
| |
| @Override |
| protected int distinctSize(Set<SemanticIdentity> visited) { |
| int result = 0; |
| if (!visited.contains(this.getSemanticIdentity())) { |
| visited.add(this.getSemanticIdentity()); |
| result++; |
| for (NavigationStep step : steps) { |
| result += ((AbstractNavigationStep) step).distinctSize(visited); |
| } |
| } |
| return result; |
| } |
| |
| @Override |
| public SemanticIdentity getSemanticIdentity() { |
| return semanticIdentity; |
| } |
| |
| public InstanceScopeAnalysis getInstanceScopeAnalysis() { |
| return null; |
| } |
| } |