| /******************************************************************************* |
| * Copyright (c) 2000, 2015 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.ui.texteditor.quickdiff; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.ListIterator; |
| |
| import org.eclipse.core.runtime.Assert; |
| |
| import org.eclipse.jface.text.source.IAnnotationModel; |
| |
| import org.eclipse.ui.internal.texteditor.TextEditorPlugin; |
| import org.eclipse.ui.internal.texteditor.quickdiff.DocumentLineDiffer; |
| import org.eclipse.ui.internal.texteditor.quickdiff.QuickDiffExtensionsRegistry; |
| |
| import org.eclipse.ui.texteditor.ITextEditor; |
| |
| /** |
| * Access class for the quick diff reference provider extension point. |
| * <p> |
| * This class may be instantiated, it is not intended to be subclassed. |
| * </p> |
| * @since 3.0 |
| * @noextend This class is not intended to be subclassed by clients. |
| */ |
| public class QuickDiff { |
| |
| /** |
| * Creates a new instance. |
| */ |
| public QuickDiff() { |
| } |
| |
| /** |
| * Returns the descriptor of the "last saved version" reference provider. |
| * <p> |
| * Clients should not cache this value because it can change when plug-ins get dynamically added or removed. |
| * </p> |
| * |
| * @return the descriptor of "last saved version" reference provider or <code>null</code> if none |
| */ |
| public ReferenceProviderDescriptor getDefaultProvider() { |
| QuickDiffExtensionsRegistry registry= TextEditorPlugin.getDefault().getQuickDiffExtensionRegistry(); |
| if (registry != null) |
| return registry.getDefaultProvider(); |
| |
| return null; |
| } |
| |
| /** |
| * Returns a non-modifiable list of <code>ReferenceProviderDescriptor</code> describing all extension |
| * to the <code>quickDiffReferenceProvider</code> extension point. |
| * <p> |
| * Clients should not cache this list because it can change when plug-ins get dynamically added or removed. |
| * </p> |
| * |
| * @return the non-modifiable list of extensions to the <code>quickDiffReferenceProvider</code> extension point. |
| */ |
| public List<ReferenceProviderDescriptor> getReferenceProviderDescriptors() { |
| QuickDiffExtensionsRegistry registry= TextEditorPlugin.getDefault().getQuickDiffExtensionRegistry(); |
| if (registry != null) |
| return registry.getReferenceProviderDescriptors(); |
| |
| return Collections.emptyList(); |
| } |
| |
| /** |
| * Returns the quick diff reference provider registered under <code>id</code>, or the default |
| * reference provider. The returned provider gets its editor set to <code>editor</code>. If neither |
| * the requested provider nor the default provider return <code>true</code> from <code>isEnabled</code> after |
| * having the editor set, <code>null</code> is returned. |
| * <p> |
| * Clients should not cache this value because it can change when plug-ins get dynamically added or removed. |
| * </p> |
| * |
| * @param editor the editor to be installed with the returned provider |
| * @param id the id as specified in the <code>plugin.xml</code> that installs the reference provider |
| * @return the reference provider registered under <code>id</code>, or the default reference provider, or <code>null</code> |
| */ |
| public IQuickDiffReferenceProvider getReferenceProviderOrDefault(ITextEditor editor, String id) { |
| Assert.isNotNull(editor); |
| Assert.isNotNull(id); |
| |
| List<ReferenceProviderDescriptor> descs= getReferenceProviderDescriptors(); |
| // try to fetch preferred provider; load if needed |
| for (Iterator<ReferenceProviderDescriptor> iter= descs.iterator(); iter.hasNext();) { |
| ReferenceProviderDescriptor desc= iter.next(); |
| if (desc.getId().equals(id)) { |
| IQuickDiffReferenceProvider provider= desc.createProvider(); |
| if (provider != null) { |
| provider.setActiveEditor(editor); |
| if (provider.isEnabled()) |
| return provider; |
| provider.dispose(); |
| provider= null; |
| } |
| } |
| } |
| |
| for (ListIterator<ReferenceProviderDescriptor> iter= descs.listIterator(descs.size()); iter.hasPrevious();) { |
| ReferenceProviderDescriptor desc= iter.previous(); |
| IQuickDiffReferenceProvider provider= desc.createProvider(); |
| if (provider != null) { |
| provider.setActiveEditor(editor); |
| if (provider.isEnabled()) |
| return provider; |
| provider.dispose(); |
| provider= null; |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Creates a new line differ annotation model with its reference provider set to the reference provider |
| * obtained by calling <code>getReferenceProviderOrDefault(editor, id)</code>. |
| * |
| * @param editor the editor to be installed with the returned provider |
| * @param id the id as specified in the <code>plugin.xml</code> that installs the reference provider |
| * @return a quick diff annotation model |
| */ |
| public IAnnotationModel createQuickDiffAnnotationModel(ITextEditor editor, String id) { |
| IQuickDiffReferenceProvider provider= getReferenceProviderOrDefault(editor, id); |
| if (provider != null) { |
| DocumentLineDiffer differ= new DocumentLineDiffer(); |
| differ.setReferenceProvider(provider); |
| return differ; |
| } |
| return null; |
| } |
| |
| /** |
| * Returns the identifier of the quick diff provider installed with the given diff annotation |
| * model, or the empty string if it is not a diff annotation model or has no configured diff |
| * provider. |
| * |
| * @param differ a diff annotation model |
| * @return the reference provider id, or the empty string for none |
| * @since 3.2 |
| */ |
| public Object getConfiguredQuickDiffProvider(IAnnotationModel differ) { |
| if (differ instanceof DocumentLineDiffer) { |
| DocumentLineDiffer lineDiffer= (DocumentLineDiffer) differ; |
| IQuickDiffReferenceProvider provider= lineDiffer.getReferenceProvider(); |
| if (provider != null) |
| return provider.getId(); |
| } |
| return ""; //$NON-NLS-1$ |
| } |
| |
| } |