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/*******************************************************************************
* Copyright (c) 2004, 2013 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 implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.debug.ui.actions.IVariableValueEditor;
/**
* Manager which provides the variable value editors contributed
* via the org.eclipse.debug.ui.variableValueEditors extension
* point.
*
* @see org.eclipse.debug.ui.actions.IVariableValueEditor
* @since 3.1
*/
public class VariableValueEditorManager {
/**
* Mapping of debug model identifiers to variable value editors.
* The keys in this map are always Strings (model ids).
* The values in the map are IConfigurationElements at startup,
* which are replaced by IVariableValueEditors as the editors
* are instantiated (editors are loaded lazily, then cached).
*/
private Map<String, Object> fEditorMap = new HashMap<>();
/**
* The singleton instance of this manager.
*/
private static VariableValueEditorManager fgManager;
/**
* Creates a new variable value editor manager. Clients
* should access the singleton instance of this manager
* by calling getDefault()
*/
private VariableValueEditorManager() {
loadVariableEditors();
}
/**
* Returns the singleton instance of this manager.
* @return the singleton instance of this manager
*/
public static VariableValueEditorManager getDefault() {
if (fgManager == null) {
fgManager= new VariableValueEditorManager();
}
return fgManager;
}
/**
* Returns the variable value editor associated with the given debug
* model identifier or <code>null</code> if no editor has been supplied
* for the given debug model.
* @param modelIdentifier the debug model identifier
* @return the variable value editor associated with the given debug model
* identifier or <code>null</code>
*/
public IVariableValueEditor getVariableValueEditor(String modelIdentifier) {
Object object = fEditorMap.get(modelIdentifier);
IVariableValueEditor editor= null;
if (object instanceof IVariableValueEditor) {
editor= (IVariableValueEditor) object;
} else if (object instanceof IConfigurationElement) {
try {
editor = (IVariableValueEditor) ((IConfigurationElement) object).createExecutableExtension("class"); //$NON-NLS-1$
fEditorMap.put(modelIdentifier, editor);
} catch (CoreException e) {
// If an exception occurs, loading the extension, just log it and
// return null.
DebugUIPlugin.log(e);
}
}
return editor;
}
/**
* Loads contributors to the org.eclipse.debug.ui.variableValueEditors extension point,
* for use when the user runs this action.
*/
private void loadVariableEditors() {
IExtensionPoint ep = Platform.getExtensionRegistry().getExtensionPoint(DebugUIPlugin.getUniqueIdentifier(), IDebugUIConstants.EXTENSION_POINT_VARIABLE_VALUE_EDITORS);
IConfigurationElement[] elements = ep.getConfigurationElements();
for (IConfigurationElement element : elements) {
String modelId = element.getAttribute("modelId"); //$NON-NLS-1$
if (modelId != null) {
fEditorMap.put(modelId, element);
}
}
}
}
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