org.eclipse.core.runtime.IAdapterManager Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2000, 2015 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
* Sergey Prigogin (Google) - use parameterized types (bug 442021)
* Lars Vogel - Bug 478864
*******************************************************************************/
package org.eclipse.core.runtime;
/**
* An adapter manager maintains a registry of adapter factories. Clients
* directly invoke methods on an adapter manager to register and unregister
* adapters. All adaptable objects (that is, objects that implement the IAdaptable
* interface) funnel IAdaptable.getAdapter invocations to their
* adapter manager's IAdapterManger.getAdapter method. The
* adapter manager then forwards this request unmodified to the IAdapterFactory.getAdapter
* method on one of the registered adapter factories.
*
* Adapter factories can be registered programmatically using the registerAdapters
* method. Alternatively, they can be registered declaratively using the
* org.eclipse.core.runtime.adapters extension point. Factories registered
* with this extension point will not be able to provide adapters until their
* corresponding plugin has been activated.
*
* The following code snippet shows how one might register an adapter of type
* com.example.acme.Sticky on resources in the workspace.
*
*
*
* IAdapterFactory pr = new IAdapterFactory() {
* {@literal @}Override
* public Class[] getAdapterList() {
* return new Class[] { com.example.acme.Sticky.class };
* }
*
* {@literal @}Override
* public <T> T getAdapter(Object adaptableObject, Class<T> adapterType) {
* IResource res = (IResource) adaptableObject;
* QualifiedName key = new QualifiedName("com.example.acme", "sticky-note");
* try {
* com.example.acme.Sticky v = (com.example.acme.Sticky) res.getSessionProperty(key);
* if (v == null) {
* v = new com.example.acme.Sticky();
* res.setSessionProperty(key, v);
* }
* } catch (CoreException e) {
* // unable to access session property - ignore
* }
* return v;
* }
* }
* Platform.getAdapterManager().registerAdapters(pr, IResource.class);
*
*
*
* This interface can be used without OSGi running.
*
* This interface is not intended to be implemented by clients.
*
* @see IAdaptable
* @see IAdapterFactory
* @noextend This interface is not intended to be extended by clients.
* @noimplement This interface is not intended to be implemented by clients.
*/
public interface IAdapterManager {
/**
* This value can be returned to indicate that no applicable adapter factory
* was found.
* @since org.eclipse.equinox.common 3.3
*/
public static final int NONE = 0;
/**
* This value can be returned to indicate that an adapter factory was found,
* but has not been loaded.
* @since org.eclipse.equinox.common 3.3
*/
public static final int NOT_LOADED = 1;
/**
* This value can be returned to indicate that an adapter factory is loaded.
* @since org.eclipse.equinox.common 3.3
*/
public static final int LOADED = 2;
/**
* Returns the types that can be obtained by converting adaptableClass
* via this manager. Converting means that subsequent calls to getAdapter()
* or loadAdapter() could result in an adapted object.
*
* Note that the returned types do not guarantee that
* a subsequent call to getAdapter with the same type as an argument
* will return a non-null result. If the factory's plug-in has not yet been
* loaded, or if the factory itself returns null, then
* getAdapter will still return null.
*
* @param adaptableClass the adaptable class being queried
* @return an array of type names that can be obtained by converting
* adaptableClass via this manager. An empty array
* is returned if there are none.
* @since 3.1
*/
public String[] computeAdapterTypes(Class adaptableClass);
/**
* Returns the class search order for a given class. The search order from a
* class with the definition
* class X extends Y implements A, B
* is as follows:
*
* - the target's class: X
*
- X's superclasses in order to
Object
* - a breadth-first traversal of each class's interfaces in the
* order returned by
getInterfaces (in the example, X's
* superinterfaces then Y's superinterfaces)
*
*
* @param clazz the class for which to return the class order.
* @return the class search order for the given class. The returned
* search order will minimally contain the target class.
* @since 3.1
*/
public Class[] computeClassOrder(Class clazz);
/**
* Returns an object which is an instance of the given class associated
* with the given object. Returns null if no such object can
* be found.
*
* Note that this method will never cause plug-ins to be loaded. If the
* only suitable factory is not yet loaded, this method will return null.
*
* In most cases, it is preferable for client code to use
* {@link Adapters#adapt(Object, Class, boolean)} rather than calling this
* method directly since doing so will also detect interfaces supplied by the
* {@link IAdaptable} interface
*
* @param adaptable the adaptable object being queried (usually an instance
* of IAdaptable)
* @param adapterType the type of adapter to look up
* @return an object of the given adapter type, or null
* if the given adaptable object does not have an available adapter of the
* given type
*/
public T getAdapter(Object adaptable, Class adapterType);
/**
* Returns an object which is an instance of the given class name associated
* with the given object. Returns null if no such object can
* be found.
*
* Note that this method will never cause plug-ins to be loaded. If the
* only suitable factory is not yet loaded, this method will return null.
* If activation of the plug-in providing the factory is required, use the
* loadAdapter method instead.
*
* In most cases, it is preferable for client code to use
* {@link Adapters#adapt(Object, Class, boolean)} rather than calling this
* method directly since doing so will also detect interfaces supplied by the
* {@link IAdaptable} interface
*
* @param adaptable the adaptable object being queried (usually an instance
* of IAdaptable)
* @param adapterTypeName the fully qualified name of the type of adapter to look up
* @return an object castable to the given adapter type, or null
* if the given adaptable object does not have an available adapter of the
* given type
* @since 3.0
*/
public Object getAdapter(Object adaptable, String adapterTypeName);
/**
* Returns whether there is an adapter factory registered that may be able
* to convert adaptable to an object of type adapterTypeName.
*
* Note that a return value of true does not guarantee that
* a subsequent call to getAdapter with the same arguments
* will return a non-null result. If the factory's plug-in has not yet been
* loaded, or if the factory itself returns null, then
* getAdapter will still return null.
*
* @param adaptable the adaptable object being queried (usually an instance
* of IAdaptable)
* @param adapterTypeName the fully qualified class name of an adapter to
* look up
* @return true if there is an adapter factory that claims
* it can convert adaptable to an object of type adapterType,
* and false otherwise.
* @since 3.0
*/
public boolean hasAdapter(Object adaptable, String adapterTypeName);
/**
* Returns a status of an adapter factory registered that may be able
* to convert adaptable to an object of type adapterTypeName.
*
* One of the following values can be returned:
*
* - {@link org.eclipse.core.runtime.IAdapterManager#NONE} if no applicable adapter factory was found;
* - {@link org.eclipse.core.runtime.IAdapterManager#NOT_LOADED} if an adapter factory was found, but has not been loaded;
* - {@link org.eclipse.core.runtime.IAdapterManager#LOADED} if an adapter factory was found, and it is loaded.
*
*
* @param adaptable the adaptable object being queried (usually an instance
* of IAdaptable)
* @param adapterTypeName the fully qualified class name of an adapter to
* look up
* @return a status of the adapter
* @since org.eclipse.equinox.common 3.3
*/
public int queryAdapter(Object adaptable, String adapterTypeName);
/**
* Returns an object that is an instance of the given class name associated
* with the given object. Returns null if no such object can
* be found.
*
* Note that unlike the getAdapter methods, this method
* will cause the plug-in that contributes the adapter factory to be loaded
* if necessary. As such, this method should be used judiciously, in order
* to avoid unnecessary plug-in activations. Most clients should avoid
* activation by using getAdapter instead.
*
* In most cases, it is preferable for client code to use
* {@link Adapters#adapt(Object, Class, boolean)} rather than calling this
* method directly since doing so will also detect interfaces supplied by the
* {@link IAdaptable} interface.
*
* @param adaptable the adaptable object being queried (usually an instance
* of IAdaptable)
* @param adapterTypeName the fully qualified name of the type of adapter to look up
* @return an object castable to the given adapter type, or null
* if the given adaptable object does not have an available adapter of the
* given type
* @since 3.0
*/
public Object loadAdapter(Object adaptable, String adapterTypeName);
/**
* Registers the given adapter factory as extending objects of the given
* type.
*
* If the type being extended is a class, the given factory's adapters are
* available on instances of that class and any of its subclasses. If it is
* an interface, the adapters are available to all classes that directly or
* indirectly implement that interface.
*
*
* @param factory the adapter factory
* @param adaptable the type being extended
* @see #unregisterAdapters(IAdapterFactory)
* @see #unregisterAdapters(IAdapterFactory, Class)
*/
public void registerAdapters(IAdapterFactory factory, Class adaptable);
/**
* Removes the given adapter factory completely from the list of registered
* factories. Equivalent to calling unregisterAdapters(IAdapterFactory,Class)
* on all classes against which it had been explicitly registered. Does
* nothing if the given factory is not currently registered.
*
* @param factory the adapter factory to remove
* @see #registerAdapters(IAdapterFactory, Class)
*/
public void unregisterAdapters(IAdapterFactory factory);
/**
* Removes the given adapter factory from the list of factories registered
* as extending the given class. Does nothing if the given factory and type
* combination is not registered.
*
* @param factory the adapter factory to remove
* @param adaptable one of the types against which the given factory is
* registered
* @see #registerAdapters(IAdapterFactory, Class)
*/
public void unregisterAdapters(IAdapterFactory factory, Class adaptable);
}