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/*******************************************************************************
* Copyright (c) 2017 Ericsson 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
*******************************************************************************/
package org.eclipse.lsp4e.cpp.language;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.lsp4e.LanguageServersRegistry;
import org.eclipse.lsp4e.LanguageServersRegistry.LanguageServerDefinition;
import org.eclipse.lsp4e.LanguageServiceAccessor;
import org.eclipse.lsp4e.ProjectSpecificLanguageServerWrapper;
import org.eclipse.lsp4j.DidChangeWatchedFilesParams;
import org.eclipse.lsp4j.FileChangeType;
import org.eclipse.lsp4j.FileEvent;
/**
* A resource listener used to generate FileEvents, as part of the LSP. This
* only listens to Added, Changed, Removed event on a specific project that as a
* C/C++ language server started.
*/
@SuppressWarnings("restriction")
final class CPPResourceChangeListener implements IResourceChangeListener {
private final IProject fProject;
CPPResourceChangeListener(IProject project) {
fProject = project;
}
@Override
public void resourceChanged(IResourceChangeEvent event) {
LanguageServerDefinition definition = LanguageServersRegistry.getInstance().getDefinition(CPPLanguageServer.ID);
ProjectSpecificLanguageServerWrapper wrapper = getLanguageSeverWrapper(definition);
if (event.getType() != IResourceChangeEvent.POST_CHANGE || !isRelevantDelta(event.getDelta())
|| wrapper == null) {
return;
}
sendFileEvents(wrapper, createFileEventsFromResourceEvent(event));
}
private static void sendFileEvents(ProjectSpecificLanguageServerWrapper wrapper, List<FileEvent> fileEvents) {
if (!fileEvents.isEmpty()) {
DidChangeWatchedFilesParams params = new DidChangeWatchedFilesParams(fileEvents);
wrapper.getServer().getWorkspaceService().didChangeWatchedFiles(params);
}
}
private static List<FileEvent> createFileEventsFromResourceEvent(IResourceChangeEvent event) {
List<FileEvent> fileEvents = new ArrayList<>();
try {
event.getDelta().accept((delta) -> {
if (delta.getResource() instanceof IFile && isRelevantDelta(delta)) {
FileEvent fileEvent = createFileEventFromDelta(delta);
if (fileEvent != null) {
fileEvents.add(fileEvent);
}
}
return true;
}, false);
} catch (CoreException e) {
// Do nothing
}
return fileEvents;
}
private ProjectSpecificLanguageServerWrapper getLanguageSeverWrapper(LanguageServerDefinition definition) {
try {
return LanguageServiceAccessor.getLSWrapperForConnection(fProject, definition, false);
} catch (IOException e) {
// Do nothing
return null;
}
}
private static boolean isRelevantDelta(IResourceDelta delta) {
int kind = delta.getKind();
int flags = delta.getFlags();
if (delta.getResource() instanceof IFile && kind == IResourceDelta.CHANGED) {
return (flags & IResourceDelta.CONTENT) != 0;
}
return kind == IResourceDelta.ADDED || kind == IResourceDelta.CHANGED || kind == IResourceDelta.REMOVED;
}
private static FileEvent createFileEventFromDelta(IResourceDelta delta) {
URI locationURI = delta.getResource().getLocationURI();
if (locationURI == null) {
return null;
}
FileChangeType changeType = null;
if (delta.getKind() == IResourceDelta.ADDED) {
changeType = FileChangeType.Created;
} else if (delta.getKind() == IResourceDelta.CHANGED) {
changeType = FileChangeType.Changed;
} else if (delta.getKind() == IResourceDelta.REMOVED) {
changeType = FileChangeType.Deleted;
} else {
throw new IllegalStateException("Unsupported resource delta kind: " + delta.getKind()); //$NON-NLS-1$
}
return new FileEvent(locationURI.toString(), changeType);
}
}
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