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/*******************************************************************************
* Copyright (c) 2017 Red Hat Inc. 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:
* Lucas Bullen (Red Hat Inc.) - initial implementation
*******************************************************************************/
package org.eclipse.ui.internal.genericeditor;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.runtime.CoreException;
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.text.reconciler.IReconciler;
import org.eclipse.jface.text.source.ISourceViewer;
/**
* A registry of reconciliers provided by extension <code>org.eclipse.ui.genericeditor.reconcilers</code>.
* Those extensions are specific to a given {@link IContentType}.
*
* @since 1.1
*/
public class ReconcilerRegistry {
private static final String EXTENSION_POINT_ID = GenericEditorPlugin.BUNDLE_ID + ".reconcilers"; //$NON-NLS-1$
/**
* This class wraps and proxies an {@link IReconciler} provided through extensions
* and loads it lazily when it can contribute to the editor, then delegates all operations to
* actual reconcilier.
*/
private static class ReconcilerExtension {
private static final String CLASS_ATTRIBUTE = "class"; //$NON-NLS-1$
private static final String CONTENT_TYPE_ATTRIBUTE = "contentType"; //$NON-NLS-1$
private IConfigurationElement extension;
private IContentType targetContentType;
private ReconcilerExtension(IConfigurationElement element) throws Exception {
this.extension = element;
this.targetContentType = Platform.getContentTypeManager().getContentType(element.getAttribute(CONTENT_TYPE_ATTRIBUTE));
}
public IReconciler createDelegate() {
try {
return (IReconciler) extension.createExecutableExtension(CLASS_ATTRIBUTE);
} catch (CoreException e) {
GenericEditorPlugin.getDefault().getLog().log(new Status(IStatus.ERROR, GenericEditorPlugin.BUNDLE_ID, e.getMessage(), e));
}
return null;
}
}
private Map<IConfigurationElement, ReconcilerExtension> extensions = new HashMap<>();
private boolean outOfSync = true;
/**
* Creates the registry and binds it to the extension point.
*/
public ReconcilerRegistry() {
Platform.getExtensionRegistry().addRegistryChangeListener(new IRegistryChangeListener() {
@Override
public void registryChanged(IRegistryChangeEvent event) {
outOfSync = true;
}
}, EXTENSION_POINT_ID);
}
/**
* Get the contributed {@link IReconciliers}s that are relevant to hook on source viewer according
* to document content types.
* @param sourceViewer the source viewer we're hooking completion to.
* @param contentTypes the content types of the document we're editing.
* @return the list of {@link IReconciler} contributed for at least one of the content types.
*/
public List<IReconciler> getReconcilers(ISourceViewer sourceViewer, Set<IContentType> contentTypes) {
if (this.outOfSync) {
sync();
}
List<IReconciler> res = new ArrayList<>();
for (ReconcilerExtension ext : this.extensions.values()) {
if (contentTypes.contains(ext.targetContentType)) {
res.add(ext.createDelegate());
}
}
return res;
}
private void sync() {
Set<IConfigurationElement> toRemoveExtensions = new HashSet<>(this.extensions.keySet());
for (IConfigurationElement extension : Platform.getExtensionRegistry().getConfigurationElementsFor(EXTENSION_POINT_ID)) {
toRemoveExtensions.remove(extension);
if (!this.extensions.containsKey(extension)) {
try {
this.extensions.put(extension, new ReconcilerExtension(extension));
} catch (Exception ex) {
GenericEditorPlugin.getDefault().getLog().log(new Status(IStatus.ERROR, GenericEditorPlugin.BUNDLE_ID, ex.getMessage(), ex));
}
}
}
for (IConfigurationElement toRemove : toRemoveExtensions) {
this.extensions.remove(toRemove);
}
this.outOfSync = false;
}
}
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