| /******************************************************************************* |
| * Copyright (c) 2000, 2012 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.ui.text.java.correction; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.custom.StyledText; |
| import org.eclipse.swt.events.TraverseEvent; |
| import org.eclipse.swt.events.TraverseListener; |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.graphics.Point; |
| import org.eclipse.swt.widgets.Control; |
| import org.eclipse.swt.widgets.Display; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.NullProgressMonitor; |
| import org.eclipse.core.runtime.Status; |
| |
| import org.eclipse.jface.util.Util; |
| import org.eclipse.jface.viewers.StyledCellLabelProvider; |
| import org.eclipse.jface.viewers.StyledString; |
| |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRewriteTarget; |
| import org.eclipse.jface.text.contentassist.ICompletionProposalExtension5; |
| import org.eclipse.jface.text.contentassist.ICompletionProposalExtension6; |
| import org.eclipse.jface.text.contentassist.IContextInformation; |
| import org.eclipse.jface.text.link.LinkedModeModel; |
| |
| import org.eclipse.ui.IEditorPart; |
| |
| import org.eclipse.ltk.core.refactoring.Change; |
| import org.eclipse.ltk.core.refactoring.IUndoManager; |
| import org.eclipse.ltk.core.refactoring.NullChange; |
| import org.eclipse.ltk.core.refactoring.RefactoringCore; |
| import org.eclipse.ltk.core.refactoring.RefactoringStatus; |
| |
| import org.eclipse.jdt.internal.corext.util.Messages; |
| |
| import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal; |
| |
| import org.eclipse.jdt.internal.ui.JavaPlugin; |
| import org.eclipse.jdt.internal.ui.JavaPluginImages; |
| import org.eclipse.jdt.internal.ui.text.correction.CorrectionCommandHandler; |
| import org.eclipse.jdt.internal.ui.text.correction.CorrectionMessages; |
| import org.eclipse.jdt.internal.ui.util.ExceptionHandler; |
| |
| |
| /** |
| * Implementation of a Java completion proposal to be used for quick fix and quick assist proposals |
| * that are based on a {@link Change}. The proposal offers additional proposal information (based on |
| * the {@link Change}). |
| * |
| * @since 3.8 |
| */ |
| public class ChangeCorrectionProposal implements IJavaCompletionProposal, ICommandAccess, ICompletionProposalExtension5, ICompletionProposalExtension6 { |
| |
| private static final NullChange COMPUTING_CHANGE= new NullChange("ChangeCorrectionProposal computing..."); //$NON-NLS-1$ |
| |
| private Change fChange; |
| private String fName; |
| private int fRelevance; |
| private Image fImage; |
| private String fCommandId; |
| |
| /** |
| * Constructs a change correction proposal. |
| * |
| * @param name the name that is displayed in the proposal selection dialog |
| * @param change the change that is executed when the proposal is applied or <code>null</code> |
| * if the change will be created by implementors of {@link #createChange()} |
| * @param relevance the relevance of this proposal |
| * @param image the image that is displayed for this proposal or <code>null</code> if no image |
| * is desired |
| */ |
| public ChangeCorrectionProposal(String name, Change change, int relevance, Image image) { |
| if (name == null) { |
| throw new IllegalArgumentException("Name must not be null"); //$NON-NLS-1$ |
| } |
| fName= name; |
| fChange= change; |
| fRelevance= relevance; |
| fImage= image; |
| fCommandId= null; |
| } |
| |
| /** |
| * Constructs a change correction proposal. Uses the default image for this proposal. |
| * |
| * @param name The name that is displayed in the proposal selection dialog. |
| * @param change The change that is executed when the proposal is applied or <code>null</code> |
| * if the change will be created by implementors of {@link #createChange()}. |
| * @param relevance The relevance of this proposal. |
| */ |
| public ChangeCorrectionProposal(String name, Change change, int relevance) { |
| this(name, change, relevance, JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE)); |
| } |
| |
| /* |
| * @see ICompletionProposal#apply(IDocument) |
| */ |
| public void apply(IDocument document) { |
| try { |
| performChange(JavaPlugin.getActivePage().getActiveEditor(), document); |
| } catch (CoreException e) { |
| ExceptionHandler.handle(e, CorrectionMessages.ChangeCorrectionProposal_error_title, CorrectionMessages.ChangeCorrectionProposal_error_message); |
| } |
| } |
| |
| /** |
| * Performs the change associated with this proposal. |
| * <p> |
| * Subclasses may extend, but must call the super implementation. |
| * |
| * @param activeEditor the editor currently active or <code>null</code> if no editor is active |
| * @param document the document of the editor currently active or <code>null</code> if no editor |
| * is visible |
| * @throws CoreException when the invocation of the change failed |
| */ |
| protected void performChange(IEditorPart activeEditor, IDocument document) throws CoreException { |
| StyledText disabledStyledText= null; |
| TraverseListener traverseBlocker= null; |
| |
| Change change= null; |
| IRewriteTarget rewriteTarget= null; |
| try { |
| change= getChange(); |
| if (change != null) { |
| if (document != null) { |
| LinkedModeModel.closeAllModels(document); |
| } |
| if (activeEditor != null) { |
| rewriteTarget= (IRewriteTarget) activeEditor.getAdapter(IRewriteTarget.class); |
| if (rewriteTarget != null) { |
| rewriteTarget.beginCompoundChange(); |
| } |
| /* |
| * Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=195834#c7 : |
| * During change execution, an EventLoopProgressMonitor can process the event queue while the text |
| * widget has focus. When that happens and the user e.g. pressed a key, the event is prematurely |
| * delivered to the text widget and screws up the document. Change execution fails or performs |
| * wrong changes. |
| * |
| * The fix is to temporarily disable the text widget. |
| */ |
| Object control= activeEditor.getAdapter(Control.class); |
| if (control instanceof StyledText) { |
| disabledStyledText= (StyledText) control; |
| if (disabledStyledText.getEditable()) { |
| disabledStyledText.setEditable(false); |
| traverseBlocker= new TraverseListener() { |
| public void keyTraversed(TraverseEvent e) { |
| e.doit= true; |
| e.detail= SWT.TRAVERSE_NONE; |
| } |
| }; |
| disabledStyledText.addTraverseListener(traverseBlocker); |
| } else { |
| disabledStyledText= null; |
| } |
| } |
| } |
| |
| change.initializeValidationData(new NullProgressMonitor()); |
| RefactoringStatus valid= change.isValid(new NullProgressMonitor()); |
| if (valid.hasFatalError()) { |
| IStatus status= new Status(IStatus.ERROR, JavaPlugin.getPluginId(), IStatus.ERROR, |
| valid.getMessageMatchingSeverity(RefactoringStatus.FATAL), null); |
| throw new CoreException(status); |
| } else { |
| IUndoManager manager= RefactoringCore.getUndoManager(); |
| Change undoChange; |
| boolean successful= false; |
| try { |
| manager.aboutToPerformChange(change); |
| undoChange= change.perform(new NullProgressMonitor()); |
| successful= true; |
| } finally { |
| manager.changePerformed(change, successful); |
| } |
| if (undoChange != null) { |
| undoChange.initializeValidationData(new NullProgressMonitor()); |
| manager.addUndo(getName(), undoChange); |
| } |
| } |
| } |
| } finally { |
| if (disabledStyledText != null) { |
| disabledStyledText.setEditable(true); |
| disabledStyledText.removeTraverseListener(traverseBlocker); |
| } |
| if (rewriteTarget != null) { |
| rewriteTarget.endCompoundChange(); |
| } |
| |
| if (change != null) { |
| change.dispose(); |
| } |
| } |
| } |
| |
| /* |
| * @see ICompletionProposal#getAdditionalProposalInfo() |
| */ |
| public String getAdditionalProposalInfo() { |
| Object info= getAdditionalProposalInfo(new NullProgressMonitor()); |
| return info == null ? null : info.toString(); |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension5#getAdditionalProposalInfo(org.eclipse.core.runtime.IProgressMonitor) |
| */ |
| public Object getAdditionalProposalInfo(IProgressMonitor monitor) { |
| StringBuffer buf= new StringBuffer(); |
| buf.append("<p>"); //$NON-NLS-1$ |
| try { |
| Change change= getChange(); |
| if (change != null) { |
| String name= change.getName(); |
| if (name.length() == 0) { |
| return null; |
| } |
| buf.append(name); |
| } else { |
| return null; |
| } |
| } catch (CoreException e) { |
| buf.append("Unexpected error when accessing this proposal:<p><pre>"); //$NON-NLS-1$ |
| buf.append(e.getLocalizedMessage()); |
| buf.append("</pre>"); //$NON-NLS-1$ |
| } |
| buf.append("</p>"); //$NON-NLS-1$ |
| return buf.toString(); |
| } |
| |
| /* |
| * @see ICompletionProposal#getContextInformation() |
| */ |
| public IContextInformation getContextInformation() { |
| return null; |
| } |
| |
| /* |
| * @see ICompletionProposal#getDisplayString() |
| */ |
| public String getDisplayString() { |
| String shortCutString= CorrectionCommandHandler.getShortCutString(getCommandId()); |
| if (shortCutString != null) { |
| return Messages.format(CorrectionMessages.ChangeCorrectionProposal_name_with_shortcut, new String[] { getName(), shortCutString }); |
| } |
| return getName(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension6#getStyledDisplayString() |
| */ |
| public StyledString getStyledDisplayString() { |
| StyledString str= new StyledString(getName()); |
| |
| String shortCutString= CorrectionCommandHandler.getShortCutString(getCommandId()); |
| if (shortCutString != null) { |
| String decorated= Messages.format(CorrectionMessages.ChangeCorrectionProposal_name_with_shortcut, new String[] { getName(), shortCutString }); |
| return StyledCellLabelProvider.styleDecoratedString(decorated, StyledString.QUALIFIER_STYLER, str); |
| } |
| return str; |
| } |
| |
| /** |
| * Returns the name of the proposal. |
| * |
| * @return the name of the proposal |
| */ |
| public String getName() { |
| return fName; |
| } |
| |
| /* |
| * @see ICompletionProposal#getImage() |
| */ |
| public Image getImage() { |
| return fImage; |
| } |
| |
| /* |
| * @see ICompletionProposal#getSelection(IDocument) |
| */ |
| public Point getSelection(IDocument document) { |
| return null; |
| } |
| |
| /** |
| * Sets the proposal's image or <code>null</code> if no image is desired. |
| * |
| * @param image the desired image. |
| */ |
| public void setImage(Image image) { |
| fImage= image; |
| } |
| |
| /** |
| * Returns the change that will be executed when the proposal is applied. |
| * This method calls {@link #createChange()} to compute the change. |
| * |
| * @return the change for this proposal, can be <code>null</code> in rare cases if creation of |
| * the change failed |
| * @throws CoreException when the change could not be created |
| */ |
| public final Change getChange() throws CoreException { |
| if (Util.isGtk()) { |
| // workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=293995 : |
| // [Widgets] Deadlock while UI thread displaying/computing a change proposal and non-UI thread creating image |
| |
| // Solution is to create the change outside a 'synchronized' block. |
| // Synchronization is achieved by polling fChange, using "fChange == COMPUTING_CHANGE" as barrier. |
| // Timeout of 10s for safety reasons (should not be reached). |
| long end= System.currentTimeMillis() + 10000; |
| do { |
| boolean computing; |
| synchronized (this) { |
| computing= fChange == COMPUTING_CHANGE; |
| } |
| if (computing) { |
| try { |
| Display display= Display.getCurrent(); |
| if (display != null) { |
| while (! display.isDisposed() && display.readAndDispatch()) { |
| // empty the display loop |
| } |
| display.sleep(); |
| } else { |
| Thread.sleep(100); |
| } |
| } catch (InterruptedException e) { |
| //continue |
| } |
| } else { |
| synchronized (this) { |
| if (fChange == COMPUTING_CHANGE) { |
| continue; |
| } else if (fChange != null) { |
| return fChange; |
| } else { |
| fChange= COMPUTING_CHANGE; |
| } |
| } |
| Change change= createChange(); |
| synchronized (this) { |
| fChange= change; |
| } |
| return change; |
| } |
| } while (System.currentTimeMillis() < end); |
| |
| synchronized (this) { |
| if (fChange == COMPUTING_CHANGE) { |
| return null; //failed |
| } |
| } |
| |
| } else { |
| synchronized (this) { |
| if (fChange == null) { |
| fChange= createChange(); |
| } |
| } |
| } |
| return fChange; |
| } |
| |
| /** |
| * Creates the change for this proposal. |
| * This method is only called once and only when no change has been passed in |
| * {@link #ChangeCorrectionProposal(String, Change, int, Image)}. |
| * |
| * Subclasses may override. |
| * |
| * @return the created change |
| * @throws CoreException if the creation of the change failed |
| */ |
| protected Change createChange() throws CoreException { |
| return new NullChange(); |
| } |
| |
| /** |
| * Sets the display name. |
| * |
| * @param name the name to set |
| */ |
| public void setDisplayName(String name) { |
| if (name == null) { |
| throw new IllegalArgumentException("Name must not be null"); //$NON-NLS-1$ |
| } |
| fName= name; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jdt.ui.text.java.IJavaCompletionProposal#getRelevance() |
| */ |
| public int getRelevance() { |
| return fRelevance; |
| } |
| |
| /** |
| * Sets the relevance. |
| * |
| * @param relevance the relevance to set |
| * |
| * @see #getRelevance() |
| */ |
| public void setRelevance(int relevance) { |
| fRelevance= relevance; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jdt.ui.text.java.correction.ICommandAccess#getCommandId() |
| |
| |
| */ |
| public String getCommandId() { |
| return fCommandId; |
| } |
| |
| /** |
| * Set the proposal id to allow assigning a shortcut to the correction proposal. |
| * |
| * @param commandId The proposal id for this proposal or <code>null</code> if no command |
| * should be assigned to this proposal. |
| */ |
| public void setCommandId(String commandId) { |
| fCommandId= commandId; |
| } |
| |
| } |