[findReferences] Added new API to look up references for the object

scope and all reference for the resource and object scopes

Change-Id: I6ca72af424d72658ce56cad8ebcf8c366a57a87b
Signed-off-by: akosyakov <anton.kosyakov@typefox.io>

plugins/org.eclipse.xtext/src/org/eclipse/xtext/findReferences/AnyTargetURISet.xtend

@@ -0,0 +1,71 @@
+/*******************************************************************************
+ * Copyright (c) 2016 TypeFox GmbH (http://www.typefox.io) 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.findReferences
+
+import com.google.common.collect.Iterators
+import com.google.inject.Singleton
+import org.eclipse.emf.common.util.URI
+
+/**
+ * It is used to look up all references for a resource or object scope.
+ * 
+ * @author kosyakov - Initial contribution and API
+ * @since 2.10
+ */
+@Singleton
+package class AnyTargetURISet implements TargetURIs {
+
+	override addAllURIs(Iterable<URI> uris) {
+		// do nothing
+	}
+
+	override addURI(URI uri) {
+		// do nothing
+	}
+
+	override asSet() {
+		emptySet
+	}
+
+	override contains(URI uri) {
+		true
+	}
+
+	override containsResource(URI resourceURI) {
+		true
+	}
+
+	override getEObjectURIs(URI resourceURI) {
+		emptySet
+	}
+
+	override getTargetResourceURIs() {
+		emptySet
+	}
+
+	override <T> getUserData(Key<T> key) {
+		null
+	}
+
+	override isEmpty() {
+		true
+	}
+
+	override <T> putUserData(Key<T> key, T data) {
+		// do nothing
+	}
+
+	override size() {
+		0
+	}
+
+	override iterator() {
+		Iterators.emptyIterator
+	}
+
+}

plugins/org.eclipse.xtext/src/org/eclipse/xtext/findReferences/IReferenceFinder.java

@@ -122,6 +122,53 @@ public interface IReferenceFinder {
 			Acceptor acceptor,
 			IProgressMonitor monitor);
 	
+	/**
+	 * Finds all references from the given source resource.
+	 * 
+	 * @param scope
+	 *            the search scope for the resources containing the sources of the references.
+	 * @param acceptor
+	 *            accepts the matches.
+	 * @param monitor
+	 *            the progress monitor. Can be null.
+	 */
+	void findAllReferences(
+			Resource scope,
+			Acceptor acceptor,
+			IProgressMonitor monitor);
+	
+	/**
+	 * Finds the references from the given source object to the given <code>targetURIs</code>.
+	 * 
+	 * @param targetURIs
+	 *            the URIs of the target elements of the references. Should be normalized.
+	 * @param scope
+	 *            the search scope for the object containing the sources of the references.
+	 * @param acceptor
+	 *            accepts the matches.
+	 * @param monitor
+	 *            the progress monitor. Can be null.
+	 */
+	void findReferences(
+			TargetURIs targetURIs,
+			EObject scope,
+			Acceptor acceptor,
+			IProgressMonitor monitor);
+	
+	/**
+	 * Finds all references from the given source object.
+	 * 
+	 * @param scope
+	 *            the search scope for the object containing the sources of the references.
+	 * @param acceptor
+	 *            accepts the matches.
+	 * @param monitor
+	 *            the progress monitor. Can be null.
+	 */
+	void findAllReferences(
+			EObject scope,
+			Acceptor acceptor,
+			IProgressMonitor monitor);
 
 	/**
 	 * Finds all references to the given <code>targetURIs</code>.

plugins/org.eclipse.xtext/src/org/eclipse/xtext/findReferences/ReferenceFinder.java

@@ -38,6 +38,9 @@ import com.google.inject.Singleton;
  */
 @Singleton
 public class ReferenceFinder implements IReferenceFinder {
+	
+	@Inject
+	private AnyTargetURISet anyTargetURISet;
 
 	@Inject
 	private IResourceServiceProvider.Registry serviceProviderRegistry;
@@ -113,16 +116,31 @@ public class ReferenceFinder implements IReferenceFinder {
 		}
 	}
 	
+	@Override
+	public void findAllReferences(Resource scope, Acceptor acceptor, IProgressMonitor monitor) {
+		findReferences(anyTargetURISet, scope, acceptor, monitor);
+	}
+	
 	@Override
 	public void findReferences(TargetURIs targetURIs, Resource resource, Acceptor acceptor, IProgressMonitor monitor) {
 		for (EObject content : resource.getContents()) {
-			if (monitor.isCanceled()) {
-				throw new OperationCanceledException();
-			}
-			findLocalReferencesFromElement(targetURIs, content, resource, acceptor);
+			findReferences(targetURIs, content, acceptor, monitor);
 		}
 	}
 	
+	@Override
+	public void findAllReferences(EObject scope, Acceptor acceptor, IProgressMonitor monitor) {
+		findReferences(anyTargetURISet, scope, acceptor, monitor);
+	}
+	
+	@Override
+	public void findReferences(TargetURIs targetURIs, EObject scope, Acceptor acceptor, IProgressMonitor monitor) {
+		if (monitor != null && monitor.isCanceled()) {
+			throw new OperationCanceledException();
+		}
+		findLocalReferencesFromElement(targetURIs, scope, scope.eResource(), acceptor);
+	}
+	
 	@Override
 	public void findReferences(final TargetURIs targetURIs, IResourceDescription resourceDescription,
 			IResourceAccess resourceAccess, final Acceptor acceptor, final IProgressMonitor monitor) {