migrate migrate

plugins/org.eclipse.n4js/src/org/eclipse/n4js/resource/N4JSDerivedStateComputer.java

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+/**
+ * Copyright (c) 2016 NumberFour AG.
+ * 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:
+ *   NumberFour AG - Initial API and implementation
+ */
+package org.eclipse.n4js.resource;
+
+import java.util.List;
+
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.n4js.ts.types.TModule;
+import org.eclipse.n4js.typesbuilder.N4JSTypesBuilder;
+import org.eclipse.xtext.resource.DerivedStateAwareResource;
+import org.eclipse.xtext.resource.IDerivedStateComputer;
+
+import com.google.inject.Inject;
+
+/**
+ * Derives the types model from the AST and stores it at the second index of the resource. See {@link N4JSTypesBuilder}.
+ */
+public class N4JSDerivedStateComputer implements IDerivedStateComputer {
+
+	@Inject
+	private N4JSUnloader n4jsUnloader;
+	@Inject
+	private N4JSTypesBuilder typesBuilder;
+
+	/**
+	 * Creates an {@link TModule} on the second slot of the resource. when the resource contents is not empty.
+	 */
+	@Override
+	public void installDerivedState(DerivedStateAwareResource resource, boolean preLinkingPhase) {
+		List<EObject> contents = resource.getContents();
+		if (contents.isEmpty()) {
+			String msg = "cannot install derived state in resource '" + resource.getURI().toString() + "' without AST";
+			throw new IllegalStateException(msg);
+		} else if (contents.size() == 1) {
+			typesBuilder.createTModuleFromSource(resource, preLinkingPhase);
+		} else if (contents.size() == 2) {
+			typesBuilder.relinkTModuleToSource(resource, preLinkingPhase);
+		} else {
+			throw new IllegalStateException("resource '" + resource.getURI().toString() + "' with more than two roots");
+		}
+	}
+
+	/**
+	 * Calls {@link N4JSUnloader#unloadRoot(EObject)} for the second slot root. Then all contents of the resource are
+	 * cleared.
+	 */
+	@Override
+	public void discardDerivedState(DerivedStateAwareResource resource) {
+		List<EObject> contents = resource.getContents();
+		// resource.getContents().get(1-n)clear
+		if (contents.isEmpty()) {
+			return;
+		}
+
+		// other resources may hold references to the derived state thus we
+		// have to unload (proxify) it explicitly before it is removed from the resource
+		List<EObject> tail = contents.subList(1, contents.size());
+		for (EObject eo : tail) {
+			n4jsUnloader.unloadRoot(eo);
+		}
+		tail.clear();
+	}
+}

plugins/org.eclipse.n4js/src/org/eclipse/n4js/resource/N4JSDescriptionUtils.java

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+/**
+ * Copyright (c) 2016 NumberFour AG.
+ * 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:
+ *   NumberFour AG - Initial API and implementation
+ */
+package org.eclipse.n4js.resource;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.eclipse.emf.common.util.URI;
+import org.eclipse.xtext.resource.DescriptionUtils;
+import org.eclipse.xtext.resource.IResourceDescription;
+
+/**
+ */
+public class N4JSDescriptionUtils extends DescriptionUtils {
+
+	@Override
+	public Set<URI> collectOutgoingReferences(IResourceDescription description) {
+		return new HashSet<>();
+	}
+}