Java tutorial
/******************************************************************************* * Copyright (c) 2004, 2009 Tasktop Technologies 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: * Tasktop Technologies - initial API and implementation *******************************************************************************/ package org.eclipse.mylyn.internal.sandbox.ui.views; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import org.eclipse.core.runtime.IAdaptable; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.jdt.core.IJavaElement; import org.eclipse.jdt.core.IType; import org.eclipse.jdt.core.ITypeHierarchy; import org.eclipse.jdt.core.JavaCore; import org.eclipse.jdt.ui.JavaUI; import org.eclipse.jface.action.IMenuListener; import org.eclipse.jface.action.IMenuManager; import org.eclipse.jface.action.IToolBarManager; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.action.Separator; import org.eclipse.jface.util.TransferDragSourceListener; import org.eclipse.jface.viewers.DecoratingLabelProvider; import org.eclipse.jface.viewers.IOpenListener; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.OpenEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.mylyn.commons.core.StatusHandler; import org.eclipse.mylyn.context.core.AbstractContextListener; import org.eclipse.mylyn.context.core.ContextCore; import org.eclipse.mylyn.context.core.IInteractionContext; import org.eclipse.mylyn.context.core.IInteractionElement; import org.eclipse.mylyn.internal.java.ui.JavaStructureBridge; import org.eclipse.mylyn.internal.java.ui.JavaUiBridgePlugin; import org.eclipse.mylyn.internal.sandbox.ui.JavaContextLabelProvider; import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Menu; import org.eclipse.ui.IActionBars; import org.eclipse.ui.IEditorPart; import org.eclipse.ui.IWorkbenchActionConstants; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.part.ResourceTransfer; import org.eclipse.ui.part.ViewPart; import org.eclipse.ui.views.navigator.LocalSelectionTransfer; /** * @author Mik Kersten */ public class ContextHierarchyView extends ViewPart { public static final String ID = "org.eclipse.mylyn.ui.views.active.hierarchy"; private final TreeParent root = new TreeParent("<no hierarchy>"); private TreeViewer viewer; private final Map<String, TreeParent> nodeMap = new HashMap<String, TreeParent>(); final AbstractContextListener MODEL_LISTENER = new AbstractContextListener() { @Override public void contextActivated(IInteractionContext taskscape) { refreshHierarchy(); } @Override public void contextDeactivated(IInteractionContext taskscape) { refreshHierarchy(); } @Override public void contextCleared(IInteractionContext context) { refreshHierarchy(); } @Override public void landmarkAdded(IInteractionElement element) { refreshHierarchy(); } @Override public void landmarkRemoved(IInteractionElement element) { refreshHierarchy(); } }; class ViewContentProvider implements IStructuredContentProvider, ITreeContentProvider { public void inputChanged(Viewer v, Object oldInput, Object newInput) { // ignore } public void dispose() { // don't care when we are disposed } public Object[] getElements(Object parent) { Object[] types = new Object[root.getChildren().length]; for (int i = 0; i < root.getChildren().length; i++) { types[i] = root.getChildren()[i].getElement(); } return types; } public Object getParent(Object child) { return null; // return ((TreeParent)child).getParent(); } public Object[] getChildren(Object parent) { if (parent instanceof IType) { TreeParent node = nodeMap.get(((IType) parent).getHandleIdentifier()); if (node != null) { Object[] types = new Object[node.getChildren().length]; for (int i = 0; i < node.getChildren().length; i++) { types[i] = node.getChildren()[i].getElement(); } return types; } } // if (parent instanceof TreeParent) { // return ((TreeParent)parent).getChildren(); // } return new Object[0]; } public boolean hasChildren(Object parent) { if (parent instanceof IType) { TreeParent node = nodeMap.get(((IType) parent).getHandleIdentifier()); if (node != null) { return node.getChildren().length > 0; } } return false; } } private void refreshHierarchy() { refreshHierarchy(true); } /** * Public for testing. */ public void refreshHierarchy(boolean asyncRefreshMode) { try { if (root != null && root.getChildren().length > 0) { root.removeAllChildren(); } nodeMap.clear(); Set<IInteractionElement> landmarks = ContextCore.getContextManager().getActiveLandmarks(); for (IInteractionElement node : landmarks) { IJavaElement element = null; if (node.getContentType().equals(JavaStructureBridge.CONTENT_TYPE)) { element = JavaCore.create(node.getHandleIdentifier()); } if (element != null && element instanceof IType && element.exists()) { IType type = (IType) element; ITypeHierarchy hierarchy = type.newSupertypeHierarchy(null); if (hierarchy != null) { IType[] supertypes = hierarchy.getAllSuperclasses(type); List<IType> hierarchyTypes = new ArrayList<IType>(Arrays.asList(supertypes)); Collections.reverse(hierarchyTypes); hierarchyTypes.add(type); addHierarchy(root, hierarchyTypes); } } } if (!asyncRefreshMode) { // for testing refreshViewer(); } else { PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() { public void run() { refreshViewer(); } }); } } catch (Throwable t) { StatusHandler .log(new Status(IStatus.ERROR, JavaUiBridgePlugin.ID_PLUGIN, "Could not update viewer", t)); } } private void addHierarchy(TreeParent node, List<IType> hierarchyTypes) { if (hierarchyTypes.isEmpty()) { return; } IType type = hierarchyTypes.get(0); if (!type.equals(node.getElement())) { TreeParent newNode = nodeMap.get(type.getHandleIdentifier()); if (newNode == null) { newNode = new TreeParent(type); nodeMap.put(type.getHandleIdentifier(), newNode); node.addChild(newNode); } addHierarchy(newNode, hierarchyTypes.subList(1, hierarchyTypes.size())); } } private void refreshViewer() { try { if (viewer != null && !viewer.getTree().isDisposed()) { viewer.getControl().setRedraw(false); viewer.refresh(); viewer.expandAll(); viewer.getControl().setRedraw(true); } } catch (Throwable t) { StatusHandler .log(new Status(IStatus.ERROR, JavaUiBridgePlugin.ID_PLUGIN, "Could not update viewer", t)); } } @Override public void createPartControl(Composite parent) { try { ContextCore.getContextManager().addListener(MODEL_LISTENER); refreshHierarchy(); viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL); viewer.setContentProvider(new ViewContentProvider()); viewer.setLabelProvider( new DecoratingLabelProvider(JavaContextLabelProvider.createJavaUiLabelProvider(), PlatformUI.getWorkbench().getDecoratorManager().getLabelDecorator())); viewer.setInput(getViewSite()); viewer.addOpenListener(new IOpenListener() { public void open(OpenEvent event) { StructuredSelection selection = (StructuredSelection) viewer.getSelection(); if (selection.getFirstElement() != null && selection.getFirstElement() instanceof IJavaElement) { IJavaElement element = (IJavaElement) selection.getFirstElement(); try { IEditorPart part = JavaUI.openInEditor(element); JavaUI.revealInEditor(part, element); } catch (Throwable t) { StatusHandler.log(new Status(IStatus.ERROR, JavaUiBridgePlugin.ID_PLUGIN, "Could not open type", t)); } } } }); hookContextMenu(); contributeToActionBars(); initDrop(); initDrag(); getSite().setSelectionProvider(getViewer()); } catch (Throwable t) { StatusHandler.log(new Status(IStatus.ERROR, JavaUiBridgePlugin.ID_PLUGIN, "Create failed", t)); } } private void initDrop() { Transfer[] types = new Transfer[] { LocalSelectionTransfer.getInstance() }; viewer.addDropSupport(DND.DROP_MOVE, types, new ActiveViewDropAdapter(viewer)); } private void initDrag() { int ops = DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK; Transfer[] transfers = new Transfer[] { LocalSelectionTransfer.getInstance(), ResourceTransfer.getInstance() }; TransferDragSourceListener[] dragListeners = new TransferDragSourceListener[] { new ActiveViewSelectionDragAdapter(viewer) };//, new ActiveViewResourceDragAdapter(viewer) }; viewer.addDragSupport(ops, transfers, new ActiveViewDelegatingDragAdapter(dragListeners)); } private void hookContextMenu() { MenuManager menuMgr = new MenuManager("#PopupMenu"); menuMgr.setRemoveAllWhenShown(true); menuMgr.addMenuListener(new IMenuListener() { public void menuAboutToShow(IMenuManager manager) { ContextHierarchyView.this.fillContextMenu(manager); } }); Menu menu = menuMgr.createContextMenu(viewer.getControl()); viewer.getControl().setMenu(menu); getSite().registerContextMenu(menuMgr, viewer); } private void contributeToActionBars() { IActionBars bars = getViewSite().getActionBars(); fillLocalPullDown(bars.getMenuManager()); fillLocalToolBar(bars.getToolBarManager()); } private void fillLocalPullDown(IMenuManager manager) { manager.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS)); } private void fillContextMenu(IMenuManager manager) { manager.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS)); } private void fillLocalToolBar(IToolBarManager manager) { manager.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS)); } /** * Passing the focus request to the viewer's control. */ @Override public void setFocus() { viewer.getControl().setFocus(); } public TreeViewer getViewer() { return viewer; } } class TreeParent implements IAdaptable { protected IJavaElement element; protected TreeParent parent; private final List<TreeParent> children; private String relationshipName; public TreeParent(IJavaElement element) { this.element = element; children = new ArrayList<TreeParent>(); } public TreeParent(String relationshipName) { this.relationshipName = relationshipName; children = new ArrayList<TreeParent>(); } public String getName() { return element.getElementName(); } public void setParent(TreeParent parent) { this.parent = parent; } public TreeParent getParent() { return parent; } @SuppressWarnings("rawtypes") public Object getAdapter(Class key) { return element; } public IJavaElement getElement() { return element; } @Override public String toString() { if (getElement() == null) { return relationshipName; } else { return getName(); } } public void addChild(TreeParent child) { children.add(child); child.setParent(this); } public void removeAllChildren() { for (TreeParent node : children) { if (node != null) { node.setParent(null); } } children.clear(); } public void removeChild(TreeParent child) { children.remove(child); child.setParent(null); } public TreeParent[] getChildren() { return children.toArray(new TreeParent[children.size()]); } public boolean hasChildren() { return children.size() > 0; } }