/*******************************************************************************
* Copyright (c) 2008, 2012 Wind River Systems, Inc. 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:
* Markus Schorn - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.viewsupport;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.eclipse.swt.SWTException;
import org.eclipse.ui.IDecoratorManager;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.PlatformUI;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.index.IIndex;
import org.eclipse.cdt.core.index.IIndexChangeEvent;
import org.eclipse.cdt.core.index.IIndexChangeListener;
import org.eclipse.cdt.core.index.IIndexFile;
import org.eclipse.cdt.core.index.IIndexFileLocation;
import org.eclipse.cdt.core.index.IIndexManager;
import org.eclipse.cdt.core.index.IIndexerStateEvent;
import org.eclipse.cdt.core.index.IIndexerStateListener;
import org.eclipse.cdt.core.model.CoreModel;
import org.eclipse.cdt.core.model.ICProject;
class IndexedFilesCache implements IIndexChangeListener, IIndexerStateListener, ILabelProviderListener {
private static final String DECORATOR_ID = "org.eclipse.cdt.ui.indexedFiles"; //$NON-NLS-1$
private static final IndexedFilesCache INSTANCE = new IndexedFilesCache();
private static final ISchedulingRule RULE = new ISchedulingRule() {
@Override
public boolean contains(ISchedulingRule rule) {
return rule == this;
}
@Override
public boolean isConflicting(ISchedulingRule rule) {
return rule == this;
}
};
public static IndexedFilesCache getInstance() {
return INSTANCE;
}
private final HashMap<String, Set<Integer>> fIndexedFiles= new HashMap<String, Set<Integer>>();
private boolean fIsDirty= false;
private boolean fActive= false;
private void scheduleInitialize() {
Job j= new Job(Messages.IndexedFilesCache_jobName) {
@Override
protected IStatus run(IProgressMonitor monitor) {
try {
ICProject[] prj= CoreModel.getDefault().getCModel().getCProjects();
for (ICProject project : prj) {
initialize(project);
}
} catch (CoreException e) {
return e.getStatus();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return Status.CANCEL_STATUS;
}
checkTriggerDecorator(1);
return Status.OK_STATUS;
}
@Override
public boolean belongsTo(Object family) {
return family == IndexedFilesCache.this;
}
};
j.setSystem(true);
j.setRule(RULE);
j.schedule();
}
private void scheduleInitialize(final ICProject project) {
Job j= new Job(Messages.IndexedFilesCache_jobName) {
@Override
protected IStatus run(IProgressMonitor monitor) {
try {
initialize(project);
} catch (CoreException e) {
return e.getStatus();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return Status.CANCEL_STATUS;
}
checkTriggerDecorator(1);
return Status.OK_STATUS;
}
@Override
public boolean belongsTo(Object family) {
return family == IndexedFilesCache.this;
}
};
j.setSystem(true);
j.setRule(RULE);
j.schedule();
}
final protected void initialize(ICProject prj) throws CoreException, InterruptedException {
IIndex index= CCorePlugin.getIndexManager().getIndex(prj);
List<IIndexFileLocation> list= new ArrayList<IIndexFileLocation>();
index.acquireReadLock();
try {
IIndexFile[] files= index.getAllFiles();
for (IIndexFile ifile : files) {
if (ifile.getTimestamp() >= 0) {
list.add(ifile.getLocation());
}
}
if (!list.isEmpty()) {
final String prjName= prj.getElementName();
synchronized(fIndexedFiles) {
Set<Integer> cache= fIndexedFiles.get(prjName);
if (cache == null) {
cache= new HashSet<Integer>();
fIndexedFiles.put(prjName, cache);
}
else {
if (!cache.isEmpty()) {
cache.clear();
fIsDirty= true;
}
}
for (IIndexFileLocation ifl: list) {
final int h= computeHash(ifl);
if (cache.add(h)) {
fIsDirty= true;
}
}
}
}
}
finally {
index.releaseReadLock();
}
}
@Override
public void indexChanged(IIndexChangeEvent e) {
// the index manager has reported a change to an index
ICProject cproject= e.getAffectedProject();
if (cproject == null) {
return;
}
synchronized (fIndexedFiles) {
if (!fActive) {
return;
}
if (e.isReloaded()) {
scheduleInitialize(cproject);
}
else {
final String prjName = cproject.getElementName();
if (e.isCleared()) {
if (fIndexedFiles.remove(prjName) != null) {
fIsDirty= true;
}
}
final Set<IIndexFileLocation> filesCleared = e.getFilesCleared();
final Set<IIndexFileLocation> filesWritten = e.getFilesWritten();
if (!(filesCleared.isEmpty() && filesWritten.isEmpty())) {
Set<Integer> cache= fIndexedFiles.get(prjName);
if (cache == null) {
cache= new HashSet<Integer>();
fIndexedFiles.put(prjName, cache);
}
for (IIndexFileLocation ifl: filesCleared) {
final int h= computeHash(ifl);
if (cache.remove(h)) {
fIsDirty= true;
}
}
for (IIndexFileLocation ifl: filesWritten) {
final int h= computeHash(ifl);
if (cache.add(h)) {
fIsDirty= true;
}
}
}
}
}
}
@Override
public void indexChanged(IIndexerStateEvent event) {
if (event.indexerIsIdle()) {
checkTriggerDecorator(0);
}
}
private void activate() {
synchronized (fIndexedFiles) {
fActive= true;
PlatformUI.getWorkbench().getDecoratorManager().addListener(this);
final IIndexManager indexManager = CCorePlugin.getIndexManager();
indexManager.addIndexChangeListener(IndexedFilesCache.this);
indexManager.addIndexerStateListener(IndexedFilesCache.this);
scheduleInitialize();
}
}
private void deactivate() {
synchronized (fIndexedFiles) {
fActive= false;
fIndexedFiles.clear();
final IIndexManager indexManager = CCorePlugin.getIndexManager();
indexManager.removeIndexChangeListener(IndexedFilesCache.this);
indexManager.removeIndexerStateListener(IndexedFilesCache.this);
PlatformUI.getWorkbench().getDecoratorManager().removeListener(this);
}
}
final protected void checkTriggerDecorator(int jobCount) {
if (fIsDirty && CCorePlugin.getIndexManager().isIndexerIdle() &&
Job.getJobManager().find(this).length == jobCount) {
fIsDirty= false;
final IWorkbench workbench= PlatformUI.getWorkbench();
try {
workbench.getDisplay().asyncExec(new Runnable(){
@Override
public void run() {
workbench.getDecoratorManager().update(DECORATOR_ID);
}
});
}
catch (SWTException e) {
// in case the display is no longer valid
}
}
}
public boolean isIndexed(IProject project, IIndexFileLocation ifl) {
// request from a label provider
synchronized(fIndexedFiles) {
if (!fActive) {
activate();
}
Set<Integer> cache= fIndexedFiles.get(project.getName());
return cache != null && cache.contains(computeHash(ifl));
}
}
private int computeHash(IIndexFileLocation ifl) {
final String fp= ifl.getFullPath();
final int h1= fp == null ? 0 : fp.hashCode() * 43;
return h1 + ifl.getURI().hashCode();
}
@Override
public void labelProviderChanged(LabelProviderChangedEvent event) {
final Object src= event.getSource();
if (src instanceof IDecoratorManager) {
IDecoratorManager mng= (IDecoratorManager) src;
if (!mng.getEnabled(DECORATOR_ID)) {
deactivate();
}
}
}
}