examples/org.eclipse.ocl.examples.codegen/src/org/eclipse/ocl/examples/codegen/java/operation/AndOperation2Handler.java

/*******************************************************************************
 * Copyright (c) 2020 Willink Transformations Ltd 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:
 *   E.D.Willink - Initial API and implementation
 *******************************************************************************/
package org.eclipse.ocl.examples.codegen.java.operation;

import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.ocl.examples.codegen.cgmodel.CGLibraryOperationCallExp;
import org.eclipse.ocl.examples.codegen.cgmodel.CGValuedElement;
import org.eclipse.ocl.examples.codegen.java.JavaStream;
import org.eclipse.ocl.pivot.library.LibraryOperation;
import org.eclipse.ocl.pivot.library.logical.BooleanAndOperation2;

/**
 * AndOperation2Handler generates inline code for the and2 Boolean operation.
 */
public class AndOperation2Handler extends AbstractLibraryOperationHandler
	{
		public AndOperation2Handler( @NonNull JavaStream js) {
			super(js);
		}

		@Override
		public @NonNull Boolean generate(@NonNull CGLibraryOperationCallExp cgOperationCallExp) {
			assert !cgOperationCallExp.getReferredOperation().isIsInvalidating();
			assert !cgOperationCallExp.getReferredOperation().isIsValidating();
			boolean hasDeclaration = false;
			//
			//	Trivial source cases
			//
			CGValuedElement cgSource = cgOperationCallExp.getSource();
			assert cgSource.isNonInvalid();
			assert cgSource.isNonNull();
			if (cgSource.isFalse()) {
				appendAssignBooleanLiteral(hasDeclaration, cgOperationCallExp, false);
				return true;
			}
			//
			//	Trivial argument cases
			//
			CGValuedElement cgArgument = cgOperationCallExp.getArguments().get(0);
			assert cgArgument != null;
			assert cgArgument.isNonInvalid();
			assert cgArgument.isNonNull();
			if (cgArgument.isFalse()) {
				appendAssignBooleanLiteral(hasDeclaration, cgOperationCallExp, false);
				return true;
			}
			//
			//	Trivial source+argument case
			//
			if (cgSource.isTrue() && cgArgument.isTrue()) {
				appendAssignBooleanLiteral(hasDeclaration, cgOperationCallExp, true);
				return true;
			}
			//
			//	Real case
			//
			if (!js.appendLocalStatements(cgSource)) {
				return false;
			}
			hasDeclaration = appendDeclaration(hasDeclaration, cgOperationCallExp);
			try {
				appendIfEqualsBoolean0(cgSource, false);
				appendAssignBooleanLiteral(hasDeclaration, cgOperationCallExp, false);
				appendElse();
				if (!js.appendLocalStatements(cgArgument)) {
					return false;
				}
				appendAssignValue(hasDeclaration, cgOperationCallExp, cgArgument);
				return true;
			}
			finally {
				appendEndIf();
			}
		}

		@Override
		public@NonNull Class<? extends LibraryOperation> getLibraryOperationClass() {
			return BooleanAndOperation2.class;
		}
	}