[xbase test] Made CompilationTestHelper work on real file system (temp folder). Added test for active annotation that reads and writes through the FileSystemSupport.

Change-Id: I62ebdf449ce193b036545d1ee87c86d3ae65582b

plugins/org.eclipse.xtext.junit4/src/org/eclipse/xtext/junit4/TemporaryFolder.java

@@ -5,10 +5,11 @@
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *******************************************************************************/
-package org.eclipse.xtext.junit4.internal;
+package org.eclipse.xtext.junit4;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.PrintStream;
 
 import org.junit.rules.ExternalResource;
 
@@ -39,6 +40,10 @@ import com.google.inject.Singleton;
  * 	}
  * }
  * </pre>
+ * 
+ * @noextend This class is not intended to be subclassed by clients.
+ * 
+ * @since 2.7
  */
 @Singleton
 public class TemporaryFolder extends ExternalResource {
@@ -113,12 +118,29 @@ public class TemporaryFolder extends ExternalResource {
 	 */
 	public File newFolder() throws IOException {
 		try {
-			return createTempDir(getRoot());
+			File tempDir = createTempDir(getRoot());
+			addSourceInfo(tempDir);
+			return tempDir;
 		} catch (IllegalStateException e) {
 			throw new IOException(e.getMessage()); // IOException(e) not available prior to 1.6
 		}
 	}
 	
+	/**
+	 * generate '.createdBy' file with a stack trace so tests that leak temp folders can be identified later.
+	 */
+	protected void addSourceInfo(File tempDir) throws IOException {
+		PrintStream printStream = new PrintStream(new File(tempDir, ".createdBy"));
+		try {
+			printStream.append("This temp dir has been created from the stack below. If you want to make sure the temp folders are cleaned up after a test executed, you should add the following to your test class: \n\n");
+			printStream.append("     @Rule @Inject public TemporaryFolder temporaryFolder \n\n");
+			new Exception().printStackTrace(printStream);
+		} finally {
+			printStream.close();
+		}
+		
+	}
+
 	/**
 	 * Copied from Guava 10.x but added a base dir argument
 	 */

plugins/org.eclipse.xtext/src/org/eclipse/xtext/generator/FileSystemSupportBasedFileSystemAccess.xtend

@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * Copyright (c) 2014 itemis AG (http://www.itemis.eu) 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
+ *******************************************************************************/
+package org.eclipse.xtext.generator
+
+import java.io.InputStream
+import org.eclipse.xtext.util.RuntimeIOException
+import org.eclipse.xtend.lib.macro.file.MutableFileSystemSupport
+import org.eclipse.xtend.lib.annotations.Accessors
+import org.eclipse.xtend.lib.macro.file.Path
+import com.google.inject.Inject
+import org.eclipse.emf.common.util.URI
+
+/**
+ * 
+ * An adapter between {org.eclipse.xtend.lib.macro.file.MutableFileSystemSupport} and {org.eclipse.xtext.generator.IFileSystemAccess}
+ * 
+ * @author Sven Efftinge - Initial contribution and API
+ * @since 2.7
+ */
+class FileSystemSupportBasedFileSystemAccess extends AbstractFileSystemAccess2 implements IFileSystemAccess, IFileSystemAccessExtension, IFileSystemAccessExtension2, IFileSystemAccessExtension3 {
+	
+	@Inject @Accessors(PUBLIC_SETTER) extension MutableFileSystemSupport fileSystemSupport
+	@Accessors(PUBLIC_SETTER) String projectName;
+	
+	protected def getPath(String fileName, String outputConfigurationName) {
+		val path = pathes.get(outputConfigurationName)
+		return new Path("/"+projectName+"/"+path+"/"+fileName)
+	}
+	
+	override generateFile(String fileName, String outputConfigurationName, CharSequence contents) {
+		val path = getPath(fileName, outputConfigurationName)
+		path.contents = contents
+	}
+	
+	override getURI(String fileName, String outputConfiguration) {
+		return URI.createFileURI(getPath(fileName, outputConfiguration).toURI.toURL.file)
+	}
+	
+	override generateFile(String fileName, String outputConfigurationName, InputStream content) throws RuntimeIOException {
+		val path = getPath(fileName, outputConfigurationName)
+		path.contentsAsStream = content
+	}
+	
+	override readBinaryFile(String fileName, String outputConfigurationName) throws RuntimeIOException {
+		val path = getPath(fileName, outputConfigurationName)
+		return path.contentsAsStream
+	}
+	
+	override readTextFile(String fileName, String outputConfigurationName) throws RuntimeIOException {
+		val path = getPath(fileName, outputConfigurationName)
+		return path.contents
+	}
+	
+}

tests/org.eclipse.xtext.tests/src/org/eclipse/xtext/resource/ConcurrentAccessTest.java

@@ -23,7 +23,7 @@ import org.eclipse.emf.ecore.resource.impl.ResourceImpl;
 import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
 import org.eclipse.emf.ecore.util.EcoreUtil;
 import org.eclipse.emf.mwe.utils.StandaloneSetup;
-import org.eclipse.xtext.junit4.internal.TemporaryFolder;
+import org.eclipse.xtext.junit4.TemporaryFolder;
 import org.eclipse.xtext.util.concurrent.AbstractReadWriteAcces;
 import org.eclipse.xtext.util.concurrent.IReadAccess;
 import org.eclipse.xtext.util.concurrent.IUnitOfWork;