| /******************************************************************************* |
| * Copyright (c) 2000, 2013 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.jdt.internal.core; |
| |
| import java.util.HashSet; |
| import java.util.Iterator; |
| |
| import org.eclipse.jdt.core.*; |
| |
| /** |
| * This class is used by <code>JavaModelManager</code> to update the JavaModel |
| * based on some <code>IJavaElementDelta</code>s. |
| */ |
| @SuppressWarnings({"rawtypes", "unchecked"}) |
| public class ModelUpdater { |
| |
| HashSet projectsToUpdate = new HashSet(); |
| |
| /** |
| * Adds the given child handle to its parent's cache of children. |
| */ |
| protected void addToParentInfo(Openable child) { |
| |
| Openable parent = (Openable) child.getParent(); |
| if (parent != null && parent.isOpen()) { |
| try { |
| OpenableElementInfo info = (OpenableElementInfo) parent.getElementInfo(); |
| info.addChild(child); |
| } catch (JavaModelException e) { |
| // do nothing - we already checked if open |
| } |
| } |
| } |
| |
| /** |
| * Closes the given element, which removes it from the cache of open elements. |
| */ |
| protected static void close(Openable element) { |
| |
| try { |
| element.close(); |
| } catch (JavaModelException e) { |
| // do nothing |
| } |
| } |
| |
| /** |
| * Processing for an element that has been added:<ul> |
| * <li>If the element is a project, do nothing, and do not process |
| * children, as when a project is created it does not yet have any |
| * natures - specifically a java nature. |
| * <li>If the elemet is not a project, process it as added (see |
| * <code>basicElementAdded</code>. |
| * </ul> |
| */ |
| protected void elementAdded(Openable element) { |
| |
| int elementType = element.getElementType(); |
| if (elementType == IJavaElement.JAVA_PROJECT) { |
| // project add is handled by JavaProject.configure() because |
| // when a project is created, it does not yet have a java nature |
| addToParentInfo(element); |
| this.projectsToUpdate.add(element); |
| } else { |
| addToParentInfo(element); |
| |
| // Force the element to be closed as it might have been opened |
| // before the resource modification came in and it might have a new child |
| // For example, in an IWorkspaceRunnable: |
| // 1. create a package fragment p using a java model operation |
| // 2. open package p |
| // 3. add file X.java in folder p |
| // When the resource delta comes in, only the addition of p is notified, |
| // but the package p is already opened, thus its children are not recomputed |
| // and it appears empty. |
| close(element); |
| } |
| |
| switch (elementType) { |
| case IJavaElement.PACKAGE_FRAGMENT_ROOT : |
| // when a root is added, and is on the classpath, the project must be updated |
| this.projectsToUpdate.add(element.getJavaProject()); |
| break; |
| case IJavaElement.PACKAGE_FRAGMENT : |
| // get rid of package fragment cache |
| JavaProject project = (JavaProject) element.getJavaProject(); |
| project.resetCaches(); |
| break; |
| } |
| } |
| |
| /** |
| * Generic processing for elements with changed contents:<ul> |
| * <li>The element is closed such that any subsequent accesses will re-open |
| * the element reflecting its new structure. |
| * </ul> |
| */ |
| protected void elementChanged(Openable element) { |
| |
| close(element); |
| } |
| |
| /** |
| * Generic processing for a removed element:<ul> |
| * <li>Close the element, removing its structure from the cache |
| * <li>Remove the element from its parent's cache of children |
| * <li>Add a REMOVED entry in the delta |
| * </ul> |
| */ |
| protected void elementRemoved(Openable element) { |
| |
| if (element.isOpen()) { |
| close(element); |
| } |
| removeFromParentInfo(element); |
| int elementType = element.getElementType(); |
| |
| switch (elementType) { |
| case IJavaElement.JAVA_MODEL : |
| JavaModelManager.getIndexManager().reset(); |
| break; |
| case IJavaElement.JAVA_PROJECT : |
| JavaModelManager manager = JavaModelManager.getJavaModelManager(); |
| JavaProject javaProject = (JavaProject) element; |
| manager.removePerProjectInfo(javaProject, true /* remove external jar files indexes and timestamps*/); |
| manager.containerRemove(javaProject); |
| break; |
| case IJavaElement.PACKAGE_FRAGMENT_ROOT : |
| this.projectsToUpdate.add(element.getJavaProject()); |
| break; |
| case IJavaElement.PACKAGE_FRAGMENT : |
| // get rid of package fragment cache |
| JavaProject project = (JavaProject) element.getJavaProject(); |
| project.resetCaches(); |
| break; |
| } |
| } |
| |
| /** |
| * Converts a <code>IResourceDelta</code> rooted in a <code>Workspace</code> into |
| * the corresponding set of <code>IJavaElementDelta</code>, rooted in the |
| * relevant <code>JavaModel</code>s. |
| */ |
| public void processJavaDelta(IJavaElementDelta delta) { |
| try { |
| traverseDelta(delta, null, null); // traverse delta |
| |
| // reset project caches of projects that were affected |
| Iterator iterator = this.projectsToUpdate.iterator(); |
| while (iterator.hasNext()) { |
| JavaProject project = (JavaProject) iterator.next(); |
| project.resetCaches(); |
| } |
| } finally { |
| this.projectsToUpdate = new HashSet(); |
| } |
| } |
| |
| /** |
| * Removes the given element from its parents cache of children. If the |
| * element does not have a parent, or the parent is not currently open, |
| * this has no effect. |
| */ |
| protected void removeFromParentInfo(Openable child) { |
| |
| Openable parent = (Openable) child.getParent(); |
| if (parent != null && parent.isOpen()) { |
| try { |
| OpenableElementInfo info = (OpenableElementInfo) parent.getElementInfo(); |
| info.removeChild(child); |
| } catch (JavaModelException e) { |
| // do nothing - we already checked if open |
| } |
| } |
| } |
| |
| /** |
| * Converts an <code>IResourceDelta</code> and its children into |
| * the corresponding <code>IJavaElementDelta</code>s. |
| * Return whether the delta corresponds to a resource on the classpath. |
| * If it is not a resource on the classpath, it will be added as a non-java |
| * resource by the sender of this method. |
| */ |
| protected void traverseDelta( |
| IJavaElementDelta delta, |
| IPackageFragmentRoot root, |
| IJavaProject project) { |
| |
| boolean processChildren = true; |
| |
| Openable element = (Openable) delta.getElement(); |
| switch (element.getElementType()) { |
| case IJavaElement.JAVA_PROJECT : |
| project = (IJavaProject) element; |
| break; |
| case IJavaElement.PACKAGE_FRAGMENT_ROOT : |
| root = (IPackageFragmentRoot) element; |
| break; |
| case IJavaElement.COMPILATION_UNIT : |
| // filter out working copies that are not primary (we don't want to add/remove them to/from the package fragment |
| CompilationUnit cu = (CompilationUnit)element; |
| if (cu.isWorkingCopy() && !cu.isPrimary()) { |
| return; |
| } |
| // $FALL-THROUGH$ |
| case IJavaElement.CLASS_FILE : |
| processChildren = false; |
| break; |
| } |
| |
| switch (delta.getKind()) { |
| case IJavaElementDelta.ADDED : |
| elementAdded(element); |
| break; |
| case IJavaElementDelta.REMOVED : |
| elementRemoved(element); |
| break; |
| case IJavaElementDelta.CHANGED : |
| if ((delta.getFlags() & IJavaElementDelta.F_CONTENT) != 0){ |
| elementChanged(element); |
| } |
| break; |
| } |
| if (processChildren) { |
| IJavaElementDelta[] children = delta.getAffectedChildren(); |
| for (int i = 0; i < children.length; i++) { |
| IJavaElementDelta childDelta = children[i]; |
| traverseDelta(childDelta, root, project); |
| } |
| } |
| } |
| } |