| /*=============================================================================# |
| # Copyright (c) 2011, 2021 Stephan Wahlbrink and others. |
| # |
| # This program and the accompanying materials are made available under the |
| # terms of the Eclipse Public License 2.0 which is available at |
| # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0 |
| # which is available at https://www.apache.org/licenses/LICENSE-2.0. |
| # |
| # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 |
| # |
| # Contributors: |
| # Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation |
| #=============================================================================*/ |
| |
| package org.eclipse.statet.ltk.ui.sourceediting; |
| |
| import java.util.IdentityHashMap; |
| import java.util.Map; |
| |
| import org.eclipse.jface.text.IInformationControlCreator; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.ITextViewer; |
| import org.eclipse.jface.text.information.IInformationProvider; |
| import org.eclipse.jface.text.information.IInformationProviderExtension; |
| import org.eclipse.jface.text.information.IInformationProviderExtension2; |
| |
| import org.eclipse.statet.ecommons.text.core.sections.DocContentSections; |
| |
| |
| /** |
| * Source viewer information provider supporting separate implementations for each document content |
| * section type. |
| * |
| * Implement {@link #createHandler(String)} for lazy initialization of the information provider |
| * of the section types. |
| * |
| * @see DocContentSections |
| */ |
| public class MultiContentSectionInformationProvider implements |
| IInformationProvider, IInformationProviderExtension, IInformationProviderExtension2 { |
| |
| |
| private static final Object NULL= new Object(); |
| |
| |
| private final DocContentSections sections; |
| |
| private final Map<String, Object> handlers= new IdentityHashMap<>(8); |
| |
| private EditorInformationProvider activeProvider; |
| |
| |
| public MultiContentSectionInformationProvider(final DocContentSections sections) { |
| if (sections == null) { |
| throw new NullPointerException("sections"); //$NON-NLS-1$ |
| } |
| this.sections= sections; |
| } |
| |
| public MultiContentSectionInformationProvider(final DocContentSections sections, |
| final String key1, final EditorInformationProvider provider1) { |
| this(sections, key1, provider1, null, null); |
| } |
| |
| public MultiContentSectionInformationProvider(final DocContentSections sections, |
| final String sectionType1, final EditorInformationProvider provider1, |
| final String sectionType2, final EditorInformationProvider provider2) { |
| this(sections); |
| |
| if (sectionType1 != null) { |
| registerProvider(sectionType1, provider1); |
| } |
| if (sectionType2 != null) { |
| registerProvider(sectionType2, provider2); |
| } |
| } |
| |
| |
| protected final DocContentSections getSections() { |
| return this.sections; |
| } |
| |
| |
| public void registerProvider(final String sectionType, final EditorInformationProvider provider) { |
| if (sectionType == null) { |
| throw new NullPointerException("sectionType"); //$NON-NLS-1$ |
| } |
| this.handlers.put(sectionType, (provider != null) ? provider : NULL); |
| } |
| |
| protected final EditorInformationProvider getProvider(final String sectionType) { |
| if (sectionType == DocContentSections.ERROR) { |
| return null; |
| } |
| Object handler= this.handlers.get(sectionType); |
| if (handler == null) { |
| handler= NULL; |
| try { |
| final EditorInformationProvider newHandler= createHandler(sectionType); |
| // newProvider.init |
| if (newHandler != null) { |
| handler= newHandler; |
| } |
| } |
| finally { |
| this.handlers.put(sectionType, handler); |
| } |
| } |
| return (handler != NULL) ? (EditorInformationProvider) handler : null; |
| } |
| |
| protected EditorInformationProvider createHandler(final String sectionType) { |
| return null; |
| } |
| |
| |
| @Override |
| public IRegion getSubject(final ITextViewer textViewer, final int offset) { |
| this.activeProvider= null; |
| |
| final EditorInformationProvider provider= getProvider( |
| this.sections.getType(textViewer.getDocument(), offset) ); |
| if (provider != null) { |
| this.activeProvider= provider; |
| return this.activeProvider.getSubject(textViewer, offset); |
| } |
| return null; |
| } |
| |
| @Override |
| public String getInformation(final ITextViewer textViewer, final IRegion subject) { |
| return null; |
| } |
| |
| @Override |
| public Object getInformation2(final ITextViewer textViewer, final IRegion subject) { |
| if (this.activeProvider == null) { |
| return null; |
| } |
| return this.activeProvider.getInformation2(textViewer, subject); |
| } |
| |
| @Override |
| public IInformationControlCreator getInformationPresenterControlCreator() { |
| if (this.activeProvider == null) { |
| return null; |
| } |
| return this.activeProvider.getInformationPresenterControlCreator(); |
| } |
| |
| } |