Various internal code simplifications and modernizations

org.eclipse.xtext.tests/src/org/eclipse/xtext/naming/QualifiedNameTest.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2010, 2021 itemis AG (http://www.itemis.eu) and others.
+ * Copyright (c) 2010, 2024 itemis AG (http://www.itemis.eu) and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
@@ -12,6 +12,7 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.util.Collections;
+import java.util.function.Function;
 
 import org.eclipse.emf.ecore.resource.impl.BinaryResourceImpl;
 import org.eclipse.emf.ecore.resource.impl.BinaryResourceImpl.EObjectInputStream;
@@ -21,8 +22,6 @@
 import org.junit.Assert;
 import org.junit.Test;
 
-import com.google.common.base.Function;
-
 /**
  * @author Jan Koehnlein - Initial contribution and API
  */
@@ -213,13 +212,7 @@ public void testAppendNull() {
 	}
 
 	@Test public void testWrapper() throws Exception {
-		Function<String, String> identity = new Function<String, String>() {
-			@Override
-			public String apply(String from) {
-				return from;
-			}
-		};
-		Function<String, QualifiedName> wrapper = QualifiedName.wrapper(identity);
+		Function<String, QualifiedName> wrapper = QualifiedName.wrapper(from -> from);
 		assertEquals(QualifiedName.create(""), wrapper.apply(""));
 		assertEquals(null, wrapper.apply(null));
 		assertEquals("foo", wrapper.apply("foo").getLastSegment());

org.eclipse.xtext/src/org/eclipse/xtext/mwe/PathTraverser.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2010 itemis AG (http://www.itemis.eu) and others.
+ * Copyright (c) 2010, 2024 itemis AG (http://www.itemis.eu) and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
@@ -9,9 +9,11 @@
 package org.eclipse.xtext.mwe;
 
 import java.io.File;
-import java.util.Enumeration;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
+import java.util.stream.Collectors;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
@@ -22,7 +24,6 @@
 import com.google.common.base.Predicate;
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Multimap;
-import com.google.common.collect.Sets;
 
 /**
  * @author Sven Efftinge - Initial contribution and API
@@ -43,7 +44,7 @@ public Set<URI> findAllResourceUris(String path, Predicate<URI> isValidPredicate
 		File file = new File(path);
 		if(!file.exists()) {
 			LOG.debug("File under : " + path + " doesn't exist.");
-			return Sets.newHashSet();
+			return new HashSet<>();
 		} else if (file.isDirectory()) {
 			return traverseDir(file, isValidPredicate);
 		} else if (file.isFile()) {
@@ -54,20 +55,10 @@ public Set<URI> findAllResourceUris(String path, Predicate<URI> isValidPredicate
 
 	protected Set<URI> traverseArchive(File file, Predicate<URI> isValidPredicate) {
 		try {
-			Set<URI> result = Sets.newHashSet();
-			ZipFile zipFile = new ZipFile(file);
-			try {
-				Enumeration<? extends ZipEntry> entries = zipFile.entries();
-				while (entries.hasMoreElements()) {
-					ZipEntry entry = entries.nextElement();
-					URI uri = getUri(file, entry);
-					if (uri != null && isValidPredicate.apply(uri)) {
-						result.add(uri);
-					}
-				}
-				return result;
-			} finally {
-				zipFile.close();
+			try (ZipFile zipFile = new ZipFile(file);) {
+				return zipFile.stream().map(entry -> getUri(file, entry)) //
+						.filter(Objects::nonNull).filter(isValidPredicate) //
+						.collect(Collectors.toCollection(HashSet::new));
 			}
 		} catch (Exception e) {
 			throw new WrappedException("Error traversing archive " + file, e);
@@ -80,7 +71,7 @@ protected URI getUri(File file, ZipEntry entry) {
 	}
 
 	protected Set<URI> traverseDir(File file, final Predicate<URI> isValidPredicate) {
-		Set<URI> result = Sets.newHashSet();
+		Set<URI> result = new HashSet<>();
 		File[] files = file.listFiles();
 		if (files == null)
 			return result;

org.eclipse.xtext/src/org/eclipse/xtext/mwe/Reader.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2010 itemis AG (http://www.itemis.eu) and others.
+ * Copyright (c) 2010, 2024 itemis AG (http://www.itemis.eu) and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
@@ -9,7 +9,7 @@
 package org.eclipse.xtext.mwe;
 
 import java.io.File;
-import java.util.Collection;
+import java.util.ArrayList;
 import java.util.List;
 
 import org.apache.log4j.Logger;
@@ -24,16 +24,13 @@
 import org.eclipse.xtext.resource.containers.DelegatingIAllContainerAdapter;
 import org.eclipse.xtext.resource.containers.IAllContainersState;
 
-import com.google.common.base.Predicate;
-import com.google.common.collect.Lists;
 import com.google.common.collect.Multimap;
-import com.google.common.collect.Sets;
 
 /**
  * <p>
- * A Reader used to read EMF resources from a set of pathes.
+ * A Reader used to read EMF resources from a set of paths.
  * A path can point to a folder or an archive (zips and jars are supported).
- * Those pathes are recursively scanned and all resources for which an {@link IResourceServiceProvider} is
+ * Those paths are recursively scanned and all resources for which an {@link IResourceServiceProvider} is
  * registered in the {@link org.eclipse.xtext.resource.IResourceServiceProvider.Registry} will be available.
  * </p>
  * 
@@ -44,7 +41,7 @@
  * <p>
  * A {@link SlotEntry} is responsible for selecting certain EObjects from the loaded resources.
  * It supports selecting EObjects by their name (see {@link org.eclipse.xtext.resource.IEObjectDescription}) or by an EClass.
- * In many cases such selction returns multiple EObjects, if you're only interested in one element set the <code>firstOnly</code> flag to <code>true</code>.
+ * In many cases such section returns multiple EObjects, if you're only interested in one element set the <code>firstOnly</code> flag to <code>true</code>.
  * </p>
  * <p>
  * You might want to populate multiple workflow slots with model elements.
@@ -78,7 +75,7 @@
 public class Reader extends AbstractReader {
 
 	protected final static Logger log = Logger.getLogger(Reader.class.getName());
-	protected List<String> pathes = Lists.newArrayList();
+	protected List<String> pathes = new ArrayList<>();
 
 	/**
 	 * <p>
@@ -179,16 +176,15 @@ protected void checkConfigurationInternal(Issues issues) {
 	@Override
 	protected void invokeInternal(WorkflowContext ctx, ProgressMonitor monitor, Issues issues) {
 		ResourceSet resourceSet = getResourceSet();
-		Multimap<String, URI> uris = getPathTraverser().resolvePathes(pathes, new Predicate<URI>() {
-			@Override
-			public boolean apply(URI input) {
-				boolean result = true;
-				if (getUriFilter() != null)
-					result = getUriFilter().matches(input);
-				if (result)
-					result = getRegistry().getResourceServiceProvider(input) != null;
-				return result;
+		Multimap<String, URI> uris = getPathTraverser().resolvePathes(pathes, input -> {
+			boolean result = true;
+			if (getUriFilter() != null) {
+				result = getUriFilter().matches(input);
 			}
+			if (result) {
+				result = getRegistry().getResourceServiceProvider(input) != null;
+			}
+			return result;
 		});
 		IAllContainersState containersState = containersStateFactory.getContainersState(pathes, uris);
 		installAsAdapter(resourceSet, containersState);
@@ -202,10 +198,7 @@ protected PathTraverser getPathTraverser() {
 	}
 
 	protected void populateResourceSet(ResourceSet set, Multimap<String, URI> uris) {
-		Collection<URI> values = Sets.newHashSet(uris.values());
-		for (URI uri : values) {
-			set.createResource(uri);
-		}
+		uris.values().stream().distinct().forEach(set::createResource);
 	}
 
 	protected void installAsAdapter(ResourceSet set, IAllContainersState containersState)

org.eclipse.xtext/src/org/eclipse/xtext/mwe/RuntimeResourceSetInitializer.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2010 itemis AG (http://www.itemis.eu) and others.
+ * Copyright (c) 2010, 2024 itemis AG (http://www.itemis.eu) and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
@@ -8,6 +8,8 @@
  *******************************************************************************/
 package org.eclipse.xtext.mwe;
 
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 import org.eclipse.emf.common.util.URI;
@@ -17,8 +19,6 @@
 import org.eclipse.xtext.resource.containers.DelegatingIAllContainerAdapter;
 import org.eclipse.xtext.resource.containers.IAllContainersState;
 
-import com.google.common.base.Predicate;
-import com.google.common.collect.Lists;
 import com.google.common.collect.Multimap;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
@@ -37,38 +37,29 @@ public class RuntimeResourceSetInitializer {
 	private IResourceServiceProvider.Registry registry;
 
 	public List<String> getClassPathEntries() {
-		List<String> pathes = Lists.newArrayList();
+		List<String> paths = new ArrayList<>();
 		String classPath = System.getProperty("java.class.path");
 		String separator = System.getProperty("path.separator");
 		String[] strings = classPath.split(separator);
-		for (String path : strings) {
-			pathes.add(path);
-		}
-		return pathes;
+		Collections.addAll(paths, strings);
+		return paths;
 	}
 
 	protected Multimap<String, URI> getPathToUriMap(List<String> pathes) {
 		return getPathToUriMap(pathes, null);
 	}
-	
+
 	protected Multimap<String, URI> getPathToUriMap(List<String> pathes, final UriFilter filter) {
-		return traverser.resolvePathes(pathes, new Predicate<URI>() {
-			@Override
-			public boolean apply(URI input) {
-				boolean result = true;
-				if (filter != null)
-					result = filter.matches(input);
-				if (result)
-					result = registry.getResourceServiceProvider(input) != null;
-				return result;
-			}
+		return traverser.resolvePathes(pathes, input -> {
+			boolean result = filter == null || filter.matches(input);
+			return result && registry.getResourceServiceProvider(input) != null;
 		});
 	}
 
 	public ResourceSet getInitializedResourceSet(List<String> pathes) {
 		return getInitializedResourceSet(pathes, null);
 	}
-	
+
 	public ResourceSet getInitializedResourceSet(List<String> pathes, UriFilter filter) {
 		ResourceSet resourceSet = resourceSetProvider.get();
 		Multimap<String, URI> pathToUriMap = getPathToUriMap(pathes, filter);

org.eclipse.xtext/src/org/eclipse/xtext/naming/QualifiedName.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2010, 2018 itemis AG (http://www.itemis.eu) and others.
+ * Copyright (c) 2010, 2024 itemis AG (http://www.itemis.eu) and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
@@ -243,14 +243,12 @@ public static QualifiedName create(String singleSegment) {
 	 * Wraps a name function to return a qualified name. Returns null if the name function returns null.
 	 */
 	public static <F> Function<F, QualifiedName> wrapper(final Function<F, String> nameFunction) {
-		return new Function<F, QualifiedName>() {
-			@Override
-			public QualifiedName apply(F from) {
-				String name = nameFunction.apply(from);
-				if (name == null)
-					return null;
-				return QualifiedName.create(name);
+		return from -> {
+			String name = nameFunction.apply(from);
+			if (name == null) {
+				return null;
 			}
+			return QualifiedName.create(name);
 		};
 	}
 

org.eclipse.xtext/src/org/eclipse/xtext/resource/containers/ResourceSetBasedAllContainersState.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2010 itemis AG (http://www.itemis.eu) and others.
+ * Copyright (c) 2010, 2024 itemis AG (http://www.itemis.eu) and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
@@ -9,6 +9,7 @@
 package org.eclipse.xtext.resource.containers;
 
 import java.util.Collection;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -19,7 +20,6 @@
 import com.google.common.collect.Multimap;
 import com.google.common.collect.Multimaps;
 import com.google.common.collect.SetMultimap;
-import com.google.common.collect.Sets;
 
 /**
  * This implementation {@link IAllContainersState} associates resource (e.g. their URIs) to containers. It assumes that
@@ -38,7 +38,7 @@ public class ResourceSetBasedAllContainersState implements IAllContainersState {
 	public void configure(List<String> containers, Multimap<String, URI> container2Uris) {
 		this.containers = containers;
 		this.container2URIs = HashMultimap.create(container2Uris);
-		this.uri2container = Multimaps.invertFrom(HashMultimap.create(container2Uris), HashMultimap.<URI, String>create());
+		this.uri2container = Multimaps.invertFrom(this.container2URIs, HashMultimap.create());
 	}
 
 	@Override
@@ -69,11 +69,11 @@ public String toString() {
 		StringBuilder result = new StringBuilder();
 		result.append("[");
 		result.append(getClass().getSimpleName());
-		Set<String> invisibleContainers = Sets.newHashSet(container2URIs.keySet());
+		Set<String> invisibleContainers = new HashSet<>(container2URIs.keySet());
 		invisibleContainers.removeAll(containers);
 		if (!invisibleContainers.isEmpty()) {
 			result.append("\n  WARNING: invisible containers: ");
-			result.append(Joiner.on(", ").join(invisibleContainers));
+			result.append(String.join(", ", invisibleContainers));
 		}
 		for (String container : containers) {
 			Collection<URI> uris = container2URIs.get(container);