| /* |
| * Copyright (c) 2005, 2009 Sven Efftinge and others. |
| * 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: |
| * Sven Efftinge - Initial API and implementation |
| * Artem Tikhomirov (Borland) - Migration to OCL expressions |
| */ |
| package org.eclipse.gmf.internal.xpand.ast; |
| |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| import org.eclipse.emf.ecore.EClassifier; |
| import org.eclipse.gmf.internal.xpand.BuiltinMetaModel; |
| import org.eclipse.gmf.internal.xpand.expression.ast.Identifier; |
| import org.eclipse.gmf.internal.xpand.model.AnalysationIssue; |
| import org.eclipse.gmf.internal.xpand.model.EvaluationException; |
| import org.eclipse.gmf.internal.xpand.model.ExecutionContext; |
| import org.eclipse.gmf.internal.xpand.model.Variable; |
| import org.eclipse.gmf.internal.xpand.model.XpandIterator; |
| import org.eclipse.gmf.internal.xpand.ocl.ExpressionHelper; |
| import org.eclipse.ocl.cst.OCLExpressionCS; |
| import org.eclipse.ocl.ecore.CollectionType; |
| |
| /** |
| * @author Sven Efftinge |
| */ |
| public class ForEachStatement extends Statement { |
| |
| public static final String ITERATOR_VAR_NAME = "iterator"; |
| |
| private final Statement[] body; |
| |
| private final ExpressionHelper target; |
| |
| private final ExpressionHelper separator; |
| |
| private final Identifier variable; |
| |
| private final Identifier iteratorName; |
| |
| public ForEachStatement(final int start, final int end, final int line, final Identifier variable, final OCLExpressionCS target, final Statement[] body, final OCLExpressionCS separator, final Identifier iterator) { |
| super(start, end, line); |
| this.variable = variable; |
| this.target = new ExpressionHelper(target, this); |
| this.body = body; |
| this.separator = separator == null ? null : new ExpressionHelper(separator, this); |
| iteratorName = iterator; |
| } |
| |
| public void analyze(ExecutionContext ctx, final Set<AnalysationIssue> issues) { |
| EClassifier t = target.analyze(ctx, issues); |
| if (separator != null) { |
| final EClassifier sepT = separator.analyze(ctx, issues); |
| if (ctx.getOCLEnvironment().getOCLStandardLibrary().getString() != sepT) { |
| issues.add(new AnalysationIssue(AnalysationIssue.Type.INCOMPATIBLE_TYPES, "String expected!", target)); |
| } |
| } |
| if (t != null) { |
| if (t instanceof CollectionType) { |
| t = ((CollectionType) t).getElementType(); |
| } else { |
| issues.add(new AnalysationIssue(AnalysationIssue.Type.INCOMPATIBLE_TYPES, "Collection type expected!", target)); |
| return; |
| } |
| } |
| // XXX odd - is t == null ok here? |
| ctx = ctx.cloneWithVariable(new Variable(variable.getValue(), t, null)); |
| if (iteratorName != null) { |
| ctx = ctx.cloneWithVariable(new Variable(iteratorName.getValue(), BuiltinMetaModel.ITERATOR_TYPE, null)); |
| } |
| for (Statement statement : body) { |
| statement.analyze(ctx, issues); |
| } |
| } |
| |
| @Override |
| public void evaluateInternal(ExecutionContext ctx) { |
| Set<AnalysationIssue> issues = new HashSet<AnalysationIssue>(); |
| EClassifier targetType = target.analyze(ctx, issues); |
| if (issues.size() > 0 || false == targetType instanceof CollectionType) { |
| throw new EvaluationException("Can't evaluate FOREACH expression: target collection type cannot be defined", target); |
| } |
| EClassifier targetElementType = ((CollectionType) targetType).getElementType(); |
| final Object o = target.evaluate(ctx); |
| |
| if (!(o instanceof Collection<?>)) { |
| throw new EvaluationException("Collection expected (was: " + o.getClass().getName() + ")!", target); |
| } |
| final Collection<?> col = (Collection<?>) o; |
| final String sep = (String) (separator != null ? separator.evaluate(ctx) : null); |
| final XpandIterator iterator = new XpandIterator(col.size()); |
| |
| if (iteratorName != null) { |
| ctx = ctx.cloneWithVariable(new Variable(iteratorName.getValue(), BuiltinMetaModel.ITERATOR_TYPE, iterator)); |
| } |
| for (final Iterator<?> iter = col.iterator(); iter.hasNext();) { |
| final Object element = iter.next(); |
| if (!BuiltinMetaModel.isAssignableFrom(ctx, targetElementType, BuiltinMetaModel.getType(ctx, element))) { |
| throw new EvaluationException("Can't evaluate FOREACH expression: actual collection element type is not assignable to declared collection element type", this); |
| } |
| ctx = ctx.cloneWithVariable(new Variable(variable.getValue(), targetElementType, element)); |
| for (int i = 0; i < body.length; i++) { |
| body[i].evaluate(ctx); |
| } |
| if ((sep != null) && iter.hasNext()) { |
| ctx.getScope().getOutput().write(sep); |
| } |
| iterator.increment(); |
| } |
| } |
| |
| ExpressionHelper getSeparator() { |
| return separator; |
| } |
| |
| ExpressionHelper getTarget() { |
| return target; |
| } |
| |
| Statement[] getBody() { |
| return body; |
| } |
| |
| } |