public synchronized Map<FileNaming, Integer> refresh(
final FileNaming folderName, Runnable[] task) {
Map<FileNaming, Integer> retVal = new HashMap<FileNaming, Integer>();
Set<FileNaming> e = new HashSet<FileNaming>(getExisting(false));
Set<FileNaming> nE = new HashSet<FileNaming>(getNotExisting(false));
if (isStatus(ChildrenSupport.SOME_CHILDREN_CACHED)) {
Set<FileNaming> existingToCheck = new HashSet<FileNaming>(e);
for (FileNaming fnToCheck : existingToCheck) {
FileNaming fnRescanned = rescanChild(folderName, fnToCheck.getName(), true);
if (fnRescanned == null) {
retVal.put(fnToCheck, ChildrenCache.REMOVED_CHILD);
}
}
Set<FileNaming> notExistingToCheck = new HashSet<FileNaming>(nE);
for (FileNaming fnToCheck : notExistingToCheck) {
assert fnToCheck != null;
FileNaming fnRescanned = rescanChild(folderName, fnToCheck.getName(), true);
if (fnRescanned != null) {
retVal.put(fnToCheck, ChildrenCache.ADDED_CHILD);
}
}
} else if (isStatus(ChildrenSupport.ALL_CHILDREN_CACHED)) {
retVal = rescanChildren(folderName, true, task);
}
return retVal;
}
private synchronized void addChild(final FileNaming folderName, final FileNaming childName) {
assert childName != null;
assert childName.getParent().equals(folderName)
: "childName: " + childName.getFile() + " folderName: " + folderName.getFile();
getExisting().add(childName);
getNotExisting().remove(childName);
}
private static Set<FileNaming> deepMinus(Set<FileNaming> base, Set<FileNaming> minus) {
HashMap<FileNaming, FileNaming> detract = new HashMap<FileNaming, FileNaming>(base.size() * 2);
for (FileNaming fn : base) {
detract.put(fn, fn);
}
assert minus != null;
for (FileNaming mm : minus) {
FileNaming orig = detract.remove(mm);
if (orig != null && orig.isFile() != mm.isFile()) {
detract.put(orig, orig);
}
}
return detract.keySet();
}
private FileNaming rescanChild(
final FileNaming folderName, final String childName, boolean ignoreCache) {
final File folder = folderName.getFile();
final File child = new File(folder, childName);
final FileInfo fInfo = new FileInfo(child);
FileNaming retval =
(fInfo.isConvertibleToFileObject())
? NamingFactory.fromFile(folderName, child, ignoreCache)
: null;
if (retval != null) {
addChild(folderName, retval);
} else {
FileName fChild =
new FileName(folderName, child, null) {
@Override
public boolean isDirectory() {
return false;
}
@Override
public boolean isFile() {
return false;
}
};
removeChild(folderName, fChild);
}
return retval;
}
public synchronized void removeChild(final FileNaming folderName, final FileNaming childName) {
assert childName != null;
getExisting().remove(childName);
if (childName.getParent().equals(folderName)) {
getNotExisting().add(childName);
}
}
private FileNaming lookupChildInCache(
final FileNaming folder, final String childName, boolean lookupExisting) {
final File f = new File(folder.getFile(), childName);
final Integer id = NamingFactory.createID(f);
class FakeNaming implements FileNaming {
public FileNaming lastEqual;
public String getName() {
return childName;
}
public FileNaming getParent() {
return folder;
}
public boolean isRoot() {
return false;
}
public File getFile() {
return f;
}
public Integer getId() {
return id;
}
public FileNaming rename(String name, ProvidedExtensions.IOHandler h) {
// not implemented, as it will not be called
throw new IllegalStateException();
}
@Override
public boolean equals(Object obj) {
if (hashCode() == obj.hashCode() && getName().equals(((FileNaming) obj).getName())) {
assert lastEqual == null : "Just one can be there"; // NOI18N
if (obj instanceof FileNaming) {
lastEqual = (FileNaming) obj;
}
return true;
}
return false;
}
@Override
public int hashCode() {
return id.intValue();
}
public boolean isFile() {
return this.getFile().isFile();
}
public boolean isDirectory() {
return !isFile();
}
}
FakeNaming fake = new FakeNaming();
final Set<FileNaming> cache = (lookupExisting) ? getExisting(false) : getNotExisting(false);
if (cache.contains(fake)) {
assert fake.lastEqual != null : "If cache contains the object, we set lastEqual"; // NOI18N
assert fake.lastEqual.getName().equals(childName)
: "childName: " + childName + " equals: " + fake.lastEqual;
return fake.lastEqual;
} else {
return null;
}
}
private Map<FileNaming, Integer> rescanChildren(
final FileNaming folderName, final boolean ignoreCache, Runnable[] task) {
final Map<FileNaming, Integer> retval = new IdentityHashMap<FileNaming, Integer>();
final File folder = folderName.getFile();
assert folderName.getFile().getAbsolutePath().equals(folderName.toString());
class IOJob implements Runnable {
boolean folderExists;
Set<FileNaming> newChildren;
@Override
public void run() {
final File[] children = folder.listFiles();
if (children != null) {
newChildren = new LinkedHashSet<FileNaming>();
for (int i = 0; i < children.length; i++) {
final FileInfo fInfo = new FileInfo(children[i], 1);
if (fInfo.isConvertibleToFileObject()) {
FileNaming child = NamingFactory.fromFile(folderName, children[i], ignoreCache);
newChildren.add(child);
}
}
} else {
folderExists = folder.exists();
// #150009 - children == null -> folder does not exists, or an I/O error occurs
// folder.listFiles() failed with I/O exception - do not remove children
}
}
}
IOJob job;
if (task[0] instanceof IOJob) {
job = (IOJob) task[0];
} else {
task[0] = new IOJob();
return null;
}
if (job.newChildren == null) {
if (job.folderExists) { // #150009 - children == null -> folder does not exists, or an I/O
// error occurs
// folder.listFiles() failed with I/O exception - do not remove children
return retval;
}
job.newChildren = new LinkedHashSet<FileNaming>();
}
Set<FileNaming> deleted = deepMinus(getExisting(false), job.newChildren);
for (FileNaming fnRem : deleted) {
removeChild(folderName, fnRem);
retval.put(fnRem, ChildrenCache.REMOVED_CHILD);
}
Set<FileNaming> added = deepMinus(job.newChildren, getExisting(false));
for (FileNaming fnAdd : added) {
addChild(folderName, fnAdd);
retval.put(fnAdd, ChildrenCache.ADDED_CHILD);
}
return retval;
}