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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.stringsubstitution;
import com.ibm.icu.text.MessageFormat;
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.core.variables.IStringVariable;
import org.eclipse.debug.internal.ui.DebugUIPlugin;
/**
* Manages argument selectors (choosers) for string variables.
*
* @since 3.0
*/
public class StringVariablePresentationManager {
/**
* String variable presentation extension point identifier
* (value <code>"stringVariablePresentations"</code>).
*
* @since 3.0
*/
public static final String EXTENSION_POINT_STRING_VARIABLE_PRESENTATIONS = "stringVariablePresentations"; //$NON-NLS-1$
// default manager
private static StringVariablePresentationManager fgManager;
// extension point attributes
public static final String ATTR_NAME = "variableName"; //$NON-NLS-1$
public static final String ATTR_ARGUMENT_SELECTOR = "argumentSelector"; //$NON-NLS-1$
/**
* Table of configuration elements for variable presentations,
* keyed by variable name.
*/
private Map fConfigurations;
/**
* Returns the singleton string variable presentation manager.
*
* @return the singleton string variable presentation manager
*/
public static StringVariablePresentationManager getDefault() {
if (fgManager == null) {
fgManager = new StringVariablePresentationManager();
}
return fgManager;
}
/**
* Returns an argument selector contributed for the given
* variable, or <code>null</code> if none.
*
* @param variable string substitution variable
* @return argument selector or <code>null</code>
*/
public IArgumentSelector getArgumentSelector(IStringVariable variable) {
IConfigurationElement element = (IConfigurationElement) fConfigurations.get(variable.getName());
if (element != null) {
try {
return (IArgumentSelector)element.createExecutableExtension(ATTR_ARGUMENT_SELECTOR);
} catch (CoreException e) {
DebugUIPlugin.log(e);
}
}
return null;
}
/**
* Constructs the manager, loading extensions.
*/
private StringVariablePresentationManager() {
initialize();
}
/**
* Load extensions
*/
private void initialize() {
fConfigurations = new HashMap();
IExtensionPoint point= Platform.getExtensionRegistry().getExtensionPoint(DebugUIPlugin.getUniqueIdentifier(), EXTENSION_POINT_STRING_VARIABLE_PRESENTATIONS);
IConfigurationElement elements[]= point.getConfigurationElements();
for (int i = 0; i < elements.length; i++) {
IConfigurationElement element = elements[i];
String name= element.getAttribute(ATTR_NAME);
if (name == null) {
DebugUIPlugin.logErrorMessage(MessageFormat.format("String variable presentation extension missing required 'variableName' attribute: {0}", new String[] {element.getDeclaringExtension().getLabel()})); //$NON-NLS-1$
continue;
}
fConfigurations.put(name, element);
}
}
}
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