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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.texteditor.quickdiff;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.ui.internal.texteditor.TextEditorPlugin;
import org.eclipse.ui.texteditor.quickdiff.ReferenceProviderDescriptor;
/**
* Access class for the quick diff reference provider extension point.
*
* @since 3.0
*/
public class QuickDiffExtensionsRegistry {
/** The default reference provider's descriptor. */
private ReferenceProviderDescriptor fDefaultDescriptor;
/** The list returned to callers of <code>getExtensions</code>. */
private List<ReferenceProviderDescriptor> fDescriptors;
/**
* Creates a new instance.
*/
public QuickDiffExtensionsRegistry() {
}
/**
* Returns the default provider, which is the last saved version.
*
* @return the descriptor of the default reference provider.
*/
public synchronized ReferenceProviderDescriptor getDefaultProvider() {
ensureRegistered();
return fDefaultDescriptor;
}
/**
* Returns a non-modifiable list of <code>ReferenceProviderDescriptor</code> describing all extension
* to the <code>quickDiffReferenceProvider</code> extension point.
*
* @return the list of extensions to the <code>quickDiffReferenceProvider</code> extension point.
*/
public synchronized List<ReferenceProviderDescriptor> getReferenceProviderDescriptors() {
ensureRegistered();
return fDescriptors;
}
/**
* Ensures that the extensions are read and stored in <code>fDescriptors</code>.
*/
private void ensureRegistered() {
if (fDescriptors == null)
reloadExtensions();
}
/**
* Reads all extensions.
* <p>
* This method can be called more than once in
* order to reload from a changed extension registry.
* </p>
*/
public synchronized void reloadExtensions() {
fDefaultDescriptor= null;
IExtensionRegistry registry= Platform.getExtensionRegistry();
List<ReferenceProviderDescriptor> list= new ArrayList<>();
IConfigurationElement[] elements= registry.getConfigurationElementsFor(TextEditorPlugin.PLUGIN_ID, TextEditorPlugin.REFERENCE_PROVIDER_EXTENSION_POINT);
for (int i= 0; i < elements.length; i++) {
ReferenceProviderDescriptor desc= new ReferenceProviderDescriptor(elements[i]);
if (desc.getId().equals("org.eclipse.ui.internal.editors.quickdiff.LastSaveReferenceProvider")) //$NON-NLS-1$
fDefaultDescriptor= desc;
list.add(desc);
}
// make sure the default is the first one in the list
if (fDefaultDescriptor != null) {
list.remove(fDefaultDescriptor);
list.add(0, fDefaultDescriptor);
}
fDescriptors= Collections.unmodifiableList(list);
}
}
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