EcoreOCLFactory.java example

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/*
 * Copyright (c) 2006, 2008 Borland Software Corp.
 * 
 * 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:
 *    Alexander Shatalin (Borland) - initial API and implementation
 */
package org.eclipse.gmf.ecore.expressions;

import java.lang.ref.WeakReference;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EParameter;
import org.eclipse.emf.ecore.EcorePackage;
import org.eclipse.gmf.ecore.part.EcoreDiagramEditorPlugin;
import org.eclipse.ocl.Environment;
import org.eclipse.ocl.EvaluationEnvironment;
import org.eclipse.ocl.ParserException;
import org.eclipse.ocl.Query;
import org.eclipse.ocl.ecore.EcoreFactory;
import org.eclipse.ocl.ecore.OCL.Helper;
import org.eclipse.ocl.expressions.OCLExpression;
import org.eclipse.ocl.expressions.OperationCallExp;
import org.eclipse.ocl.expressions.Variable;
import org.eclipse.ocl.helper.OCLHelper;
import org.eclipse.ocl.options.ParsingOptions;
import org.eclipse.ocl.utilities.AbstractVisitor;
import org.eclipse.ocl.utilities.PredefinedType;

/**
 * @generated
 */
public class EcoreOCLFactory {

	/**
	* @generated
	*/
	private final EcoreAbstractExpression[] expressions;

	/**
	 * @generated
	 */
	protected EcoreOCLFactory() {
		this.expressions = new EcoreAbstractExpression[8];
	}

	/**
	* @generated
	*/
	public static EcoreAbstractExpression getExpression(int index, EClassifier context, Map<String, EClassifier> environment) {
		EcoreOCLFactory cached = EcoreDiagramEditorPlugin.getInstance().getEcoreOCLFactory();
		if (cached == null) {
			EcoreDiagramEditorPlugin.getInstance().setEcoreOCLFactory(cached = new EcoreOCLFactory());
		}
		if (index < 0 || index >= cached.expressions.length) {
			throw new IllegalArgumentException();
		}
		if (cached.expressions[index] == null) {
			final String[] exprBodies = new String[] { "self.name.concat(\' : \').concat(if self.eType.name.oclIsUndefined() then \'none\' else self.eType.name endif)", //$NON-NLS-1$
					"not oclIsKindOf(ecore::EEnum)", //$NON-NLS-1$
					"not oclIsKindOf(ecore::EEnum)", //$NON-NLS-1$
					"not containment and not container", //$NON-NLS-1$
					"self.oclIsKindOf(ecore::EClass)", //$NON-NLS-1$
					"containment", //$NON-NLS-1$
					"self.oclIsKindOf(ecore::EClass)", //$NON-NLS-1$
					"self <> oppositeEnd and not oppositeEnd.eSuperTypes->includes(self) and not self.eAllSuperTypes->includes(oppositeEnd)", //$NON-NLS-1$
			};
			cached.expressions[index] = getExpression(exprBodies[index], context, environment == null ? Collections.<String, EClassifier> emptyMap() : environment);
		}
		return cached.expressions[index];
	}

	/**
	 * @generated
	 */
	public static EcoreAbstractExpression getExpression(String body, EClassifier context, Map<String, EClassifier> environment) {
		return new Expression(body, context, environment);
	}

	/**
	 * @generated
	 */
	public static EcoreAbstractExpression getExpression(String body, EClassifier context) {
		return getExpression(body, context, Collections.<String, EClassifier> emptyMap());
	}

	/**
	 * @generated
	 */
	private static class Expression extends EcoreAbstractExpression {

		/**
		 * @generated
		 */
		private final org.eclipse.ocl.ecore.OCL oclInstance;

		/**
		* @generated
		*/
		private org.eclipse.ocl.ecore.OCLExpression oclExpression;

		/**
			 * @generated
			 */
		public Expression(String body, EClassifier context, Map<String, EClassifier> environment) {
			super(body, context);
			oclInstance = org.eclipse.ocl.ecore.OCL.newInstance();
			initCustomEnv(oclInstance.getEnvironment(), environment);
			Helper oclHelper = oclInstance.createOCLHelper();
			oclHelper.setContext(context());
			try {
				oclExpression = oclHelper.createQuery(body());
				setStatus(IStatus.OK, null, null);
			} catch (ParserException e) {
				setStatus(IStatus.ERROR, e.getMessage(), e);
			}
		}

		/**
		 * @generated
		 */
		@SuppressWarnings("rawtypes")
		protected Object doEvaluate(Object context, Map env) {
			if (oclExpression == null) {
				return null;
			}
			// on the first call, both evalEnvironment and extentMap are clear, for later we have finally, below.
			EvaluationEnvironment<?, ?, ?, ?, ?> evalEnv = oclInstance.getEvaluationEnvironment();
			// initialize environment
			for (Object nextKey : env.keySet()) {
				evalEnv.replace((String) nextKey, env.get(nextKey));
			}
			try {
				Object result = oclInstance.evaluate(context, oclExpression);
				return oclInstance.isInvalid(result) ? null : result;
			} finally {
				evalEnv.clear();
				oclInstance.setExtentMap(null); // clear allInstances cache, and get the oclInstance ready for the next call
			}
		}

		/**
		 * @generated
		 */
		private static void initCustomEnv(Environment<?, EClassifier, ?, ?, ?, EParameter, ?, ?, ?, ?, ?, ?> ecoreEnv, Map<String, EClassifier> environment) {
			// Use EObject as implicit root class for any object, to allow eContainer() and other EObject operations from OCL expressions
			ParsingOptions.setOption(ecoreEnv, ParsingOptions.implicitRootClass(ecoreEnv), EcorePackage.eINSTANCE.getEObject());
			for (String varName : environment.keySet()) {
				EClassifier varType = environment.get(varName);
				ecoreEnv.addElement(varName, createVar(ecoreEnv, varName, varType), false);
			}
		}

		/**
		 * @generated
		 */
		private static org.eclipse.ocl.ecore.Variable createVar(Environment<?, EClassifier, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?> ecoreEnv, String name, EClassifier type) {
			org.eclipse.ocl.ecore.Variable var = EcoreFactory.eINSTANCE.createVariable();
			var.setName(name);
			var.setType(ecoreEnv.getUMLReflection().getOCLType(type));
			return var;
		}
	}
}