org.eclipse.core.internal.resources.ResourceChangeListenerRegistrar Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2020 Alex Blewitt 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:
* Alex Blewitt - initial API and implementation
*******************************************************************************/
package org.eclipse.core.internal.resources;
import java.util.Map;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.osgi.service.debug.DebugOptionsListener;
import org.osgi.service.log.Logger;
import org.osgi.service.log.LoggerFactory;
/**
* Provides automatic registration of {@link IResourceChangeListener} instances
* with {@link IWorkspace} instances.
*
*
* This allows clients to register their {@link IResourceChangeListener}
* instances as services, and be called back when changes occur, in the same way
* that (for example) {@link DebugOptionsListener} is used to receive callbacks.
*
*/
public final class ResourceChangeListenerRegistrar {
private final IWorkspace workspace;
private Logger logger;
/**
* Create an ResourceChangeListenerRegistrar with the given workspace.
*
* @param workspace the workspace to associate listeners with
*/
public ResourceChangeListenerRegistrar(IWorkspace workspace) {
this.workspace = workspace;
}
/**
* Register the {@link IResourceChangeListener} with the associated workspace
*
* @param listener the listener to register
* @param properties the properties, including event.mask
if
* required
* {@link IWorkspace#addResourceChangeListener(IResourceChangeListener, int)}
*/
public void addResourceChangeListener(IResourceChangeListener listener, Map properties) {
// TODO Add as public API https://bugs.eclipse.org/bugs/show_bug.cgi?id=564985
Object mask = properties.get(IResourceChangeListener.PROPERTY_EVENT_MASK);
if (mask instanceof Integer) {
workspace.addResourceChangeListener(listener, ((Integer) mask).intValue());
} else {
Logger local = this.logger;
if (mask != null && local != null) {
local.warn("event.mask of IResourceChangeListener service: expected Integer but was {} (from {}): {}", //$NON-NLS-1$
mask.getClass(), listener.getClass(), mask);
}
workspace.addResourceChangeListener(listener);
}
}
/**
* Deregister the {@link IResourceChangeListener} from this workspace
*
* @param listener the listener to deregister
*/
public void removeResourceChangeListener(IResourceChangeListener listener) {
workspace.removeResourceChangeListener(listener);
}
/**
* Set the logger factory that can be used by this component
*
* @param factory the factory
*/
public void setLoggerFactory(LoggerFactory factory) {
this.logger = factory.getLogger(ResourceChangeListenerRegistrar.class);
}
/**
* Unsets the logger generated from the associated logger factory
*/
public void unsetLogger() {
this.logger = null;
}
}