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/*******************************************************************************
* Copyright (c) 2005, 2014 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.core.runtime;
import java.io.File;
import org.eclipse.core.internal.registry.ExtensionRegistry;
import org.eclipse.core.internal.registry.RegistryProviderFactory;
import org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI;
import org.eclipse.core.runtime.spi.IRegistryProvider;
import org.eclipse.core.runtime.spi.RegistryStrategy;
/**
* Use this class to create or obtain an extension registry.
* <p>
* The following methods can be used without OSGi running:
* </p><p><ul>
* <li>{@link #createRegistry(RegistryStrategy, Object, Object)}</li>
* <li>{@link #getRegistry()}</li>
* <li>{@link #setDefaultRegistryProvider(IRegistryProvider)}</li>
* </ul></p><p>
* This class is not intended to be subclassed or instantiated.
* </p>
* @since org.eclipse.equinox.registry 3.2
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public final class RegistryFactory {
/**
* Creates a new extension registry based on the given set of parameters.
* <p>
* The strategy is an optional collection of methods that supply additional registry
* functionality. Users may pass in <code>null</code> for the strategy if default
* behavior is sufficient.
* </p><p>
* The master token is stored by the registry and later used as an identifier of callers
* who are allowed full control over the registry functionality. Users may pass in
* <code>null</code> as a master token.
* </p><p>
* The user token is stored by the registry and later used as an identifier of callers
* who are allowed to control registry at the user level. For instance, users attempting to
* modify dynamic contributions to the registry have to use the user token. Users may pass
* in <code>null</code> as a user token.
* </p>
* @param strategy registry strategy or <code>null</code>
* @param masterToken the token used for master control of the registry or <code>null</code>
* @param userToken the token used for user control of the registry or <code>null</code>
* @return the new extension registry
*/
public static IExtensionRegistry createRegistry(RegistryStrategy strategy, Object masterToken, Object userToken) {
return new ExtensionRegistry(strategy, masterToken, userToken);
}
/**
* Returns the default extension registry specified by the registry provider.
* May return <code>null</code> if the provider has not been set or if the
* registry has not been created.
*
* @return existing extension registry or <code>null</code>
*/
public static IExtensionRegistry getRegistry() {
IRegistryProvider defaultRegistryProvider = RegistryProviderFactory.getDefault();
if (defaultRegistryProvider == null)
return null;
return defaultRegistryProvider.getRegistry();
}
/**
* Creates a registry strategy that can be used in an OSGi container. The strategy uses
* OSGi contributions and contributors for the registry processing and takes advantage of
* additional mechanisms available through the OSGi library.
* <p>
* The OSGi registry strategy sequentially checks the array of storage directories to
* discover the location of the registry cache formed by previous invocations of the extension
* registry. Once found, the location is used to store registry cache. If this value
* is <code>null</code> then caching of the registry content is disabled.
* </p><p>
* The cache read-only array is an array the same length as the storage directory array.
* It contains boolean values indicating whether or not each storage directory is read-only.
* If the value at an index is <code>true</code> then the location at the corresponding index
* in the storage directories array is read-only; if <code>false</code> then the cache location
* is read-write. The array can be <code>null</code> if the <code>storageDirs</code> parameter
* is <code>null</code>.
* </p><p>
* The master token should be passed to the OSGi registry strategy to permit it to perform
* contributions to the registry.
* </p>
* @param storageDirs array of file system directories or <code>null</code>
* @param cacheReadOnly array of read only attributes or <code>null</code>
* @param token control token for the registry
* @return registry strategy that can be used in an OSGi container
* @see #createRegistry(RegistryStrategy, Object, Object)
*/
public static RegistryStrategy createOSGiStrategy(File[] storageDirs, boolean[] cacheReadOnly, Object token) {
return new RegistryStrategyOSGI(storageDirs, cacheReadOnly, token);
}
/**
* Use this method to specify the default registry provider. The default registry provider
* is immutable in the sense that it can be set only once during the application runtime.
* Attempts to change the default registry provider will cause an exception to be thrown.
* <p>
* The given registry provider must not be <code>null</code>.
* </p>
* @see RegistryFactory#getRegistry()
* @param provider extension registry provider
* @throws CoreException if a default registry provider was already set for this application
*/
public static void setDefaultRegistryProvider(IRegistryProvider provider) throws CoreException {
RegistryProviderFactory.setDefault(provider);
}
}
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