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/*******************************************************************************
* Copyright (c) 2016-2017 Red Hat Inc. and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* - Mickael Istria (Red Hat Inc.)
*******************************************************************************/
package org.eclipse.ui.internal.genericeditor.hover;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.function.Function;
import java.util.stream.Collectors;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IRegistryChangeEvent;
import org.eclipse.core.runtime.IRegistryChangeListener;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.ITextHover;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.ui.internal.genericeditor.GenericContentTypeRelatedExtension;
import org.eclipse.ui.internal.genericeditor.GenericEditorPlugin;
import org.eclipse.ui.texteditor.ITextEditor;
/**
* Text hover registry that manages the detectors
* contributed by the <code>org.eclipse.ui.workbench.texteditor.hoverProvider</code> extension point for
* targets contributed by the <code>org.eclipse.ui.workbench.texteditor.hyperlinkDetectorTargets</code> extension point.
*
* @since 1.0
*/
public final class TextHoverRegistry {
private static final String EXTENSION_POINT_ID = GenericEditorPlugin.BUNDLE_ID + ".hoverProviders"; //$NON-NLS-1$
private SortedSet<TextHoverExtension> extensions;
private boolean outOfSync = true;
static class TextHoverExtension extends GenericContentTypeRelatedExtension<ITextHover> {
private static final String ID_ATTRIBUTE = "id"; //$NON-NLS-1$
private static final String IS_BEFORE_ATTRIBUTE = "isBefore"; //$NON-NLS-1$
private static final String IS_AFTER_ATTRIBUTE = "isAfter"; //$NON-NLS-1$
private String id;
private String isBefore;
private String isAfter;
public TextHoverExtension(IConfigurationElement extension) throws Exception {
super(extension);
this.id = extension.getAttribute(ID_ATTRIBUTE);
this.isBefore = extension.getAttribute(IS_BEFORE_ATTRIBUTE);
this.isAfter = extension.getAttribute(IS_AFTER_ATTRIBUTE);
}
public String getId() {
if (this.id != null) {
return this.id;
}
return this.extension.getContributor().getName() + '@' + toString();
}
public String getIsAfter() {
return this.isAfter;
}
public String getIsBefore() {
return this.isBefore;
}
IConfigurationElement getConfigurationElement() {
return this.extension;
}
}
public TextHoverRegistry(IPreferenceStore preferenceStore) {
Platform.getExtensionRegistry().addRegistryChangeListener(new IRegistryChangeListener() {
@Override
public void registryChanged(IRegistryChangeEvent event) {
outOfSync = true;
}
}, EXTENSION_POINT_ID);
}
public List<ITextHover> getAvailableHovers(ISourceViewer sourceViewer, ITextEditor editor, Set<IContentType> contentTypes) {
if (this.outOfSync) {
sync();
}
return this.extensions.stream()
.filter(ext -> contentTypes.contains(ext.targetContentType))
.filter(ext -> ext.matches(sourceViewer, editor))
// don't sort in the stream as the initial structure is already sorted by isAfter/isBefore
.map(GenericContentTypeRelatedExtension<ITextHover>::createDelegate)
.collect(Collectors.toList());
}
private void sync() {
Set<IConfigurationElement> toRemoveExtensions = new HashSet<>();
Map<IConfigurationElement, TextHoverExtension> ext = new HashMap<>();
if (this.extensions != null) {
ext = this.extensions.stream().collect(Collectors.toMap(TextHoverExtension::getConfigurationElement, Function.identity()));
toRemoveExtensions = ext.keySet();
}
for (IConfigurationElement extension : Platform.getExtensionRegistry().getConfigurationElementsFor(EXTENSION_POINT_ID)) {
toRemoveExtensions.remove(extension);
if (!ext.containsKey(extension)) {
try {
ext.put(extension, new TextHoverExtension(extension));
} catch (Exception ex) {
GenericEditorPlugin.getDefault().getLog().log(new Status(IStatus.ERROR, GenericEditorPlugin.BUNDLE_ID, ex.getMessage(), ex));
}
}
}
for (IConfigurationElement toRemove : toRemoveExtensions) {
ext.remove(toRemove);
}
OrderedExtensionComparator comparator = new OrderedExtensionComparator(ext.values());
this.extensions = new TreeSet<>(comparator);
this.extensions.addAll(ext.values());
this.outOfSync = false;
}
}
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