DIRECTORY
AlpineDirectory,
AlpineDirectoryBTree,
AlpineEnvironment,
AlpFile USING [Create, Handle, Open, WriteProperties],
AlpInstance USING [AccessFailed],
AlpTransaction USING [GetNextVolumeGroup, Handle, ReadNextOwner, ReadOwnerProperties, WriteOwnerProperties],
Ascii USING [Upper],
BTree USING [Compare, DeleteKey, Entry, EntrySize, EnumerateEntries, Error, New, NewPathStk, Open, ReadEntry, Relation, Tree, UpdateEntry],
BTreeAlpineVM USING [Handle, Open, ReferencePage, ReleasePage, ReOpen],
Convert USING [RopeFromCard],
IO USING [Error, GetCard, RIS],
PrincOps USING [wordsPerPage],
PrincOpsUtils USING [LongCOPY],
Process USING [Detach],
Rope USING [Cat, Equal, Find, Fetch, Flatten, FromRefText, Length, Match, ROPE, RopeRep, Substr, Text],
SafeStorage USING [EnableFinalization, EstablishFinalization, FinalizationQueue, FQNext, NewFQ];

 
AlpineDirectoryBTreeImpl: CEDAR MONITOR 
IMPORTS AlpFile, AlpInstance, AlpTransaction, AlpineDirectory, Ascii, BTree, BTreeAlpineVM, Convert, IO, PrincOpsUtils, Process, Rope, SafeStorage
EXPORTS AlpineDirectory, AlpineDirectoryBTree
SHARES Rope = BEGIN

OPEN AE: AlpineEnvironment, AD: AlpineDirectory, ADBTree: AlpineDirectoryBTree;

ReadEntry: PUBLIC PROC
[trans: AlpTransaction.Handle, name: Rope.ROPE, defaultVersion, desiredVersion: AD.Version] 
RETURNS[entry: ADBTree.EntryHandle] = BEGIN
key: REF KeyObject;
relation: BTree.Relation _ equal;
Read: UNSAFE PROC [e: BTree.Entry] = UNCHECKED BEGIN
entryPtr: EntryPtr = LOOPHOLE[e];
IF entryPtr # NIL AND EntryNameMatches[entry.nameBody, entryPtr]
THEN BEGIN
entry.found _ TRUE;
entry.keep _ entryPtr.keep;
entry.version _ entryPtr.version;
entry.nameBody _ GetText[entryPtr, entryPtr.nameBody]; -- to get capitalization
entry.directory _ Equal[entry.nameBody, directoryName];
entry.name _ FullPathName[entry];
WITH e: entryPtr^ SELECT FROM
link => {entry.link _ GetText[entryPtr, e.link]; entry.file _ AE.nullUniversalFile};
file => {entry.link _ NIL; entry.file _ e.file};
ENDCASE => ERROR;
END;
END;
entry _ GetEntryHandle[trans, name, defaultVersion]; -- creates one if none exists
IF desiredVersion = AD.highest THEN entry.desiredVersion _ AD.highest;
IF desiredVersion = AD.lowest THEN entry.desiredVersion _ AD.lowest;
IF entry.desiredVersion = AD.highest THEN relation _ lessEqual;
IF entry.desiredVersion = AD.lowest THEN relation _ greaterEqual;
entry.found _ FALSE;
key _ NewKey[entry.desiredVersion, entry.nameBody];
TRUSTED {BTree.ReadEntry[entry.btree.tree, key, relation, entry.pathStk, entry.usePathStk, Read
! BTree.Error => AD.Error[damagedDirectory]]};
FreeKey[key];
END;

WriteEntry: PUBLIC PROC
[entry: ADBTree.EntryHandle] = BEGIN
size: CARDINAL;
key: REF KeyObject;
WriteLink: UNSAFE PROC[e: BTree.Entry] = UNCHECKED BEGIN
linkPtr: LONG POINTER TO EntryObject.link = LOOPHOLE[e];
IF linkPtr = NIL THEN RETURN;
linkPtr^ _ [SIZE[EntryObject.link], entry.keep, entry.version, , link[LOOPHOLE[NIL]]];
linkPtr.nameBody _ AppendText[linkPtr, entry.nameBody];
linkPtr.link _ AppendText[linkPtr, entry.link];
END;
WriteFile: UNSAFE PROC[e: BTree.Entry] = UNCHECKED BEGIN
filePtr: LONG POINTER TO EntryObject.file = LOOPHOLE[e];
IF filePtr = NIL THEN RETURN;
filePtr^ _ [SIZE[EntryObject.file], entry.keep, entry.version, , file[entry.file]];
filePtr.nameBody _ AppendText[filePtr, entry.nameBody];
END;
IF entry.directory THEN RETURN;
key _ NewKey[entry.version, entry.nameBody];
size _ SIZE[TextRep[entry.nameBody.length]];
IF entry.link # NIL THEN TRUSTED {
size _ size + SIZE[EntryObject.link] + SIZE[TextRep[entry.link.length]];
BTree.UpdateEntry[entry.btree.tree, key, entry.pathStk, entry.usePathStk, size, WriteLink
! BTree.Error => AD.Error[damagedDirectory]]}
ELSE TRUSTED {
size _ size + SIZE[EntryObject.file];
BTree.UpdateEntry[entry.btree.tree, key, entry.pathStk, entry.usePathStk, size, WriteFile
! BTree.Error => AD.Error[damagedDirectory]]};
FreeKey[key];
END;

DeleteEntry: PUBLIC PROC
[entry: ADBTree.EntryHandle] = BEGIN
found: BOOLEAN;
key: REF KeyObject;
IF entry.directory THEN RETURN;
key _ NewKey[entry.version, entry.nameBody];
found _ BTree.DeleteKey[entry.btree.tree, key, entry.pathStk, entry.usePathStk
! BTree.Error => AD.Error[damagedDirectory]];
FreeKey[key];
END;

NextEntry: PUBLIC PROC
[trans: AlpTransaction.Handle, pattern, start: Rope.ROPE, defaultVersion: AD.Version _ AD.all]
RETURNS [entry: ADBTree.EntryHandle] = BEGIN
subDirectories: BOOL _ FALSE;
IF start = NIL 
THEN entry _ FirstOwner[trans, pattern, defaultVersion] -- <Owner>NIL
ELSE entry _ GetEntryHandle[trans, start, defaultVersion];
IF entry = NIL THEN RETURN[NIL]; -- FirstOwner returned NIL
IF ~Equal[entry.pattern, pattern] THEN {
[entry.pVolume, entry.pOwner, entry.pNameBody, entry.pVersion] _ 
ParseName[pattern, defaultVersion, TRUE];
entry.pattern _ pattern};
IF entry.pNameBody.Length[] = 0 THEN {
IF start # NIL THEN entry _ NextOwner[entry];
IF entry # NIL THEN entry.found _ TRUE; 
RETURN[entry]};
SELECT entry.pNameBody.text[entry.pNameBody.length-1] FROM
'>, '/ => subDirectories _ TRUE;
ENDCASE => subDirectories _ FALSE;
entry.found _ FALSE;
WHILE TRUE DO
IF subDirectories 
THEN entry _ NextSubDirectory[entry]
ELSE entry _ NextEntryInThisDirectory[entry];
IF entry.found THEN EXIT;
entry _ NextOwner[entry];
IF entry = NIL THEN EXIT;
ENDLOOP;
END;

NextEntryInThisDirectory: PROC
[entry: ADBTree.EntryHandle]
RETURNS[ADBTree.EntryHandle] = BEGIN
key: REF KeyObject;
Next: UNSAFE PROC[e: BTree.Entry] RETURNS[continue: BOOLEAN] = UNCHECKED BEGIN
entryPtr: EntryPtr = LOOPHOLE[e, EntryPtr];
IF entryPtr = NIL THEN RETURN[FALSE];
IF ~Rope.Match[entry.pNameBody, LOOPHOLE[@entryPtr[entryPtr.nameBody]], FALSE] 
THEN RETURN[TRUE];
entry.found _ TRUE;
entry.keep _ entryPtr.keep;
entry.version _ entryPtr.version;
entry.desiredVersion _ entryPtr.version;
entry.nameBody _ GetText[entryPtr, entryPtr.nameBody]; 
entry.directory _ Equal[entry.nameBody, directoryName];
entry.name _ FullPathName[entry];
WITH e: entryPtr^ SELECT FROM
link => {entry.link _ GetText[entryPtr, e.link]; entry.file _ AE.nullUniversalFile};
file => {entry.link _ NIL; entry.file _ e.file};
ENDCASE => ERROR;
RETURN[FALSE];
END;
IF entry.pVersion = AD.lowest OR entry.pVersion = AD.highest
THEN key _ NewKey[AD.highest, entry.nameBody] -- get the next name
ELSE key _ NewKey[entry.version, entry.nameBody]; -- get the next entry
TRUSTED {[] _ BTree.EnumerateEntries[
entry.btree.tree, key, greater, entry.pathStk, entry.usePathStk, Next
! BTree.Error => AD.Error[damagedDirectory]]};
FreeKey[key];
IF ~entry.found THEN RETURN[entry]; -- terminate the enumeration
IF entry.pVersion = AD.highest THEN TRUSTED { -- get the highest version of the new name
key _ NewKey[AD.highest, entry.nameBody];
[] _ BTree.EnumerateEntries[
entry.btree.tree, key, less, entry.pathStk, entry.usePathStk, Next
! BTree.Error => AD.Error[damagedDirectory]];
FreeKey[key]};
RETURN[entry];
END;

NextSubDirectory: PROC
[entry: ADBTree.EntryHandle]
RETURNS[ADBTree.EntryHandle] = BEGIN
key: REF KeyObject;
Next: UNSAFE PROC[e: BTree.Entry] RETURNS[continue: BOOLEAN] = UNCHECKED BEGIN
directoryPart: Rope.ROPE;
lastBracket, temp: INT _ -1;
entryPtr: EntryPtr = LOOPHOLE[e, EntryPtr];
IF entryPtr = NIL THEN RETURN[FALSE];
WHILE TRUE DO
temp _ Rope.Find[LOOPHOLE[@entryPtr[entryPtr.nameBody]], ">", lastBracket+1];
IF temp # -1 THEN lastBracket _ temp ELSE EXIT;
ENDLOOP;
IF lastBracket = -1 THEN RETURN[TRUE]; -- no subdirectories
directoryPart _ Rope.Substr[LOOPHOLE[@entryPtr[entryPtr.nameBody]], 0, lastBracket+1];
IF Equal[entry.nameBody, directoryPart] THEN RETURN[TRUE]; -- already seen
IF ~Rope.Match[entry.pNameBody, directoryPart, FALSE] THEN RETURN[TRUE];
entry.found _ TRUE;
entry.desiredVersion _ entry.version _ 0;
entry.nameBody _ Rope.FromRefText[LOOPHOLE[directoryPart]]; -- copy it out of the btree.
entry.name _ FullPathName[entry];
entry.file _ AE.nullUniversalFile;
entry.directory _ FALSE;
entry.link _ NIL; 
entry.keep _ 0;
RETURN[FALSE];
END;
key _ NewKey[AD.highest, entry.nameBody];
TRUSTED {[] _ BTree.EnumerateEntries[
entry.btree.tree, key, greater, entry.pathStk, entry.usePathStk, Next
! BTree.Error => AD.Error[damagedDirectory]]};
FreeKey[key];
RETURN[entry];
END;

FirstOwner: PROC
[trans: AlpTransaction.Handle, pattern: Rope.ROPE, defaultVersion: AD.Version _ AD.all]
RETURNS[entry: ADBTree.EntryHandle] = INLINE BEGIN
version: AD.Version;
volGroupID: AE.VolumeGroupID;
none: AE.OwnerPropertySet _ ALL[FALSE];
volume, owner, nameBody, actualOwner: Rope.Text;
[volume, owner, nameBody, version] _ ParseName[pattern, defaultVersion, TRUE];
volGroupID _ GetVolume[trans, volume];
IF Rope.Find[owner, "*"] < 0 THEN actualOwner _ owner
ELSE WHILE TRUE DO
next: Rope.ROPE;
TRUSTED {next _ AlpTransaction.ReadNextOwner[trans, volGroupID, next, none].owner};
IF next = NIL THEN EXIT;
IF Rope.Match[owner, next, FALSE] THEN {actualOwner _ Rope.Flatten[next]; EXIT};
ENDLOOP;
IF actualOwner = NIL THEN RETURN[NIL];
entry _ NewEntryHandle[trans, volume, actualOwner, NIL];
entry.pattern _ pattern;
entry.pVolume _ volume;
entry.pOwner _ owner;
entry.pNameBody _ nameBody;
entry.pVersion _ version;
entry.volGroupID _ volGroupID;
END;

NextOwner: PROC
[entry: ADBTree.EntryHandle]
RETURNS[next: ADBTree.EntryHandle] = BEGIN
nextOwner: Rope.ROPE;
none: AE.OwnerPropertySet _ ALL[FALSE];
IF Rope.Find[entry.pOwner, "*"] < 0 THEN RETURN[NIL]; 
WHILE TRUE DO
TRUSTED {nextOwner _ AlpTransaction.ReadNextOwner[entry.trans, entry.volGroupID, entry.owner, none].owner};
IF nextOwner = NIL THEN EXIT;
IF Rope.Match[entry.pOwner, nextOwner, FALSE] THEN EXIT;
ENDLOOP;
IF nextOwner # NIL THEN {
next _ NewEntryHandle[entry.trans, entry.pVolume, Rope.Flatten[nextOwner], NIL];
next.pattern _ entry.pattern;
next.pVolume _ entry.pVolume;
next.pOwner _ entry.pOwner;
next.pNameBody _ entry.pNameBody;
next.pVersion _ entry.pVersion};
FreeEntryHandle[entry];
END;

GetVolume: PROC
[trans: AlpTransaction.Handle, volume: Rope.ROPE]
RETURNS[volGroupID: AE.VolumeGroupID] = TRUSTED BEGIN
volGroupID _ AlpTransaction.GetNextVolumeGroup[trans];
IF AlpTransaction.GetNextVolumeGroup[trans, volGroupID] # AE.nullVolumeGroupID THEN ERROR;
END;

ParseName: PROC 
[name: Rope.ROPE, defaultVersion: AD.Version _ AD.highest, pattern: BOOLEAN _ FALSE]
RETURNS[volume, owner, nameBody: Rope.Text, version: AD.Version _ 1] = BEGIN
index: CARDINAL;
badName: AD.ErrorType;
text, versionName: Rope.Text;
NextPart: PROC[text: Rope.Text, index: CARDINAL, c1, c2: CHAR, pattern: BOOLEAN] 
RETURNS[part: Rope.Text, newIndex: CARDINAL] = BEGIN
FOR i: CARDINAL IN [index..text.length) DO
IF text.text[i] = c1 OR text.text[i] = c2 THEN {
IF i = index THEN RETURN[NIL, 0];  -- a nil string
RETURN[Rope.Flatten[name, index, i-index], i+1]};
IF ~IsLegal[text.text[i]] THEN AD.Error[badName];
IF ~pattern AND text.text[i] = '* THEN AD.Error[badName]; 
IF c1 # '! AND (text.text[i] = '/ OR text.text[i] = '>) THEN AD.Error[badName];
ENDLOOP;
IF text.length = index THEN RETURN[NIL, 0];
RETURN[Rope.Flatten[name, index, text.length - index], text.length];
END;
name _ Rope.Flatten[name];
text _ NARROW[name];
badName _ IF pattern THEN illegalPattern ELSE illegalFileName;
IF text = NIL OR text.length = 0 THEN AD.Error[badName];
SELECT text.text[0] FROM '/, '[ => NULL; ENDCASE => AD.Error[badName];
[volume, index] _ NextPart[text, 1, '/, '], FALSE]; -- '* is always illegal in the volume name
IF volume = NIL THEN AD.Error[badName];
IF index >= text.length THEN AD.Error[badName];
IF text.text[index] = '< THEN index _ index + 1;
[owner, index] _ NextPart[text, index, '/, '>, pattern];
IF owner = NIL THEN AD.Error[badName];
[nameBody, index] _ NextPart[text, index, '!, '!, pattern];
IF nameBody = NIL THEN IF pattern THEN RETURN ELSE AD.Error[badName];
FOR i: CARDINAL IN [0..nameBody.length) DO
IF nameBody.text[i] = '/ THEN nameBody.text[i] _ '>;
ENDLOOP;
[versionName, index] _ NextPart[text, index, ' , ' , pattern];
IF versionName = NIL OR versionName.length = 0 THEN {version _ defaultVersion; RETURN};
IF versionName.length = 1 THEN SELECT versionName.text[0] FROM
'H, 'h => {version _ AD.highest; RETURN};
'L, 'l => {version _ AD.lowest; RETURN};
'* => {version _ AD.all; RETURN};
ENDCASE;
version _ IO.GetCard[IO.RIS[versionName] ! IO.Error => AD.Error[badName]];
END;

FullPathName: PUBLIC PROC
[entry: ADBTree.EntryHandle]
RETURNS[name: Rope.ROPE] = BEGIN
lastChar: CHAR _ 000C;
length: INT = entry.nameBody.Length[];
IF length # 0 THEN lastChar _ entry.nameBody.Fetch[length-1];
name _ Rope.Cat["[", entry.volume, "]<", entry.owner, ">", entry.nameBody];
IF length = 0 OR lastChar = '> OR lastChar = '/ THEN RETURN; -- a directory or sub-directory
name _ Rope.Cat[name, "!", Convert.RopeFromCard[entry.version]];
END;

IsLegal: PACKED ARRAY CHAR OF BOOL;

InitIsLegal: PROCEDURE[] = BEGIN
IsLegal _ ALL [FALSE];
FOR c: CHAR IN ['a .. 'z] DO IsLegal[c] _ TRUE ENDLOOP;
FOR c: CHAR IN ['A .. 'Z] DO IsLegal[c] _ TRUE ENDLOOP;
FOR c: CHAR IN ['0 .. '9] DO IsLegal[c] _ TRUE ENDLOOP;
IsLegal['+] _ TRUE; IsLegal['-] _ TRUE; IsLegal['.] _ TRUE; IsLegal['$] _ TRUE;
IsLegal['/] _ TRUE; IsLegal['>] _ TRUE;
IsLegal['*] _ TRUE; -- legal in patterns
END;

Equal: PROC 
[s1, s2: Rope.ROPE] 
RETURNS[BOOL] = INLINE {
RETURN[Rope.Equal[s1, s2, FALSE]]}; -- case is never significant

cache: REF Cache _ NEW[Cache[cacheSize]];
cacheSize: CARDINAL _ 4;
Cache: TYPE = RECORD[s: SEQUENCE size: NAT OF ADBTree.EntryHandle];
rover: CARDINAL _ cacheSize - 1;

GetEntryHandle: PROC
[trans: AlpTransaction.Handle, name: Rope.ROPE, defaultVersion: AD.Version]
RETURNS[entry: ADBTree.EntryHandle] = BEGIN
entry _ LookupEntryHandle[trans, name];
IF entry = NIL THEN {
desiredVersion: AD.Version;
volume, owner, nameBody: Rope.Text;
[volume, owner, nameBody, desiredVersion] _ ParseName[name, defaultVersion];
entry _ NewEntryHandle[trans, volume, owner, nameBody];
entry.directory _ Equal[nameBody, directoryName];
entry.name _ name;
entry.desiredVersion _ desiredVersion};
END; 

LookupEntryHandle: ENTRY PROC
[trans: AlpTransaction.Handle, name: Rope.ROPE]
RETURNS[entry: ADBTree.EntryHandle] = BEGIN
FOR i: CARDINAL IN [0..cache.size) DO
IF cache[i] = NIL THEN LOOP;
IF cache[i].trans.transID # trans.transID THEN LOOP;
IF ~Equal[cache[i].name, name] THEN LOOP;
IF InUse[cache[i]] THEN LOOP; 
MakeInUse[cache[i]];  
RETURN[cache[i]]; 
ENDLOOP;
END;

NewEntryHandle: ENTRY PROC
[trans: AlpTransaction.Handle, volume, owner, nameBody: Rope.Text]
RETURNS[entry: ADBTree.EntryHandle] = BEGIN
ENABLE UNWIND => NULL;
index: CARDINAL _ cache.size;
liveBTree: ADBTree.TreeRecord _ [NIL, NIL];
deadBTree: ADBTree.TreeRecord _ [NIL, NIL];
FOR i: CARDINAL IN [0..cache.size) DO
IF cache[i] = NIL THEN LOOP;
IF cache[i].trans.transID # trans.transID THEN LOOP;
IF ~Equal[cache[i].volume, volume] THEN LOOP;
IF ~Equal[cache[i].owner, owner] THEN LOOP;
IF InUse[cache[i]] THEN { -- save btree for later use
IF liveBTree.tree = NIL THEN liveBTree _ cache[i].btree; LOOP}; 
IF ~Equal[cache[i].nameBody, nameBody] THEN LOOP;
MakeInUse[cache[i]];
RETURN[cache[i]];
ENDLOOP;
FOR i: CARDINAL IN [0..2*cache.size) DO
rover _ (rover + 1) MOD cache.size;
IF cache[rover] = NIL THEN {index _ rover; EXIT};
IF InUse[cache[rover]] THEN LOOP;
IF ~cache[rover].recentlyInUse THEN {index _ rover; EXIT};
cache[rover].recentlyInUse _ FALSE;
ENDLOOP;
IF index = cache.size THEN { -- extend the cache 
temp: REF Cache _ NEW[Cache[cache.size+4]];
FOR i: NAT IN [0..cache.size) DO temp[i] _ cache[i]; ENDLOOP;
cache _ temp};
IF cache[index] # NIL THEN {
FOR i: CARDINAL IN [0..cache.size) DO
IF i = index THEN LOOP;
IF cache[i] = NIL THEN LOOP;
IF cache[i].btree.tree # cache[index].btree.tree THEN LOOP;
IF ~InUse[cache[i]] THEN {cache[i].inUse _ NIL; cache[i] _ NIL; LOOP};
deadBTree _ [NIL, NIL]; -- still in use
EXIT; ENDLOOP};
entry _ cache[index] _ NEW[ADBTree.EntryRecord _ []];
entry.trans _ trans;
entry.owner _ owner;
entry.volume _ volume;
entry.nameBody _ nameBody;
entry.volGroupID _ GetVolume[trans, volume];
IF liveBTree.tree # NIL
THEN entry.btree _ liveBTree -- obtained from another entry
ELSE entry.btree _ OpenBTree[trans, entry.volGroupID, owner, deadBTree ! 
   ANY => { cache[index] _ NIL; REJECT } ];
entry.pathStk _ BTree.NewPathStk[];
entry.usePathStk _ TRUE;
MakeInUse[entry];
END;

FreeEntryHandle: PUBLIC ENTRY PROC
[entry: ADBTree.EntryHandle] = BEGIN
IF entry = NIL THEN RETURN;
IF ~InUse[entry] THEN ERROR;
entry.link _ NIL;
entry.file _ AE.nullUniversalFile;
entry.recentlyInUse _ TRUE;
MakeFree[entry];
END;

InUse: PROC 
[entry: ADBTree.EntryHandle] RETURNS[BOOLEAN] = INLINE {RETURN[entry.inUse = NIL]};

MakeInUse: PROC
[entry: ADBTree.EntryHandle] = INLINE {entry.inUse _ NIL};

MakeFree: PROC
[entry: ADBTree.EntryHandle] = INLINE {entry.inUse _ entry};

FinalizationProcess: PROC =
BEGIN
entry: ADBTree.EntryHandle;
DO entry _ NARROW[SafeStorage.FQNext[finalizationQ]];
FreeEntryHandle[entry];
ENDLOOP;
END;

finalizationQ: SafeStorage.FinalizationQueue;

InitializeFinalization: PROC = 
BEGIN
finalizationQ _ SafeStorage.NewFQ[10];
SafeStorage.EstablishFinalization[CODE[ADBTree.EntryRecord], 1, finalizationQ];
TRUSTED {Process.Detach[FORK FinalizationProcess[]]};
END;

directoryName: Rope.Text = "$$$.btree";
directoryVersion: AD.Version = 1;
CreateDirectory: PUBLIC PROC
[trans: AlpTransaction.Handle, volume: Rope.ROPE, owner: AE.OwnerName] = BEGIN
[] _ OpenBTree[trans, GetVolume[trans, volume], owner, [NIL, NIL], TRUE];
END;

GetDirectory: PUBLIC PROC
[trans: AlpTransaction.Handle, volume: Rope.ROPE, owner: AE.OwnerName]
RETURNS[directory: AE.UniversalFile] = BEGIN
props: LIST OF AE.OwnerPropertyValuePair;
propertySet: AE.OwnerPropertySet _ ALL[FALSE];
propertySet[rootFile] _ TRUE;
TRUSTED {props _ AlpTransaction.ReadOwnerProperties[trans, GetVolume[trans, volume], owner, propertySet]};
IF props # NIL THEN TRUSTED {WITH p: props.first SELECT FROM 
rootFile => directory _ p.rootFile;
ENDCASE => ERROR};
END;
OpenBTree: PROC
[trans: AlpTransaction.Handle, volGroupID: AE.VolumeGroupID, owner: Rope.ROPE, btree: ADBTree.TreeRecord, initialize: BOOL _ FALSE] 
RETURNS[ADBTree.TreeRecord] = BEGIN
fileID: AE.FileID _ AE.nullFileID;
file: AE.UniversalFile _ AE.nullUniversalFile;
openFileID: AlpFile.Handle _ NIL;
file _ GetDirectory[trans, NIL, owner];
IF file = AE.nullUniversalFile THEN TRUSTED {
fileRef: REF AE.UniversalFile _ NIL;
[openFileID, fileRef] _ AlpFile.Create[trans, volGroupID, owner, 20];
AlpFile.WriteProperties[openFileID, LIST[[stringName[directoryName]]]];
file _ fileRef^;
initialize _ TRUE};

IF openFileID = NIL THEN TRUSTED { 
[openFileID, fileID] _ AlpFile.Open[trans, file, readWrite !
AlpInstance.AccessFailed => { [openFileID, fileID] _ AlpFile.Open[trans, file, readOnly];
     CONTINUE }]
};

IF file.fileID # fileID THEN TRUSTED {
IF fileID # AE.nullFileID THEN file.fileID _ fileID;
AlpTransaction.WriteOwnerProperties[trans, volGroupID, owner, FALSE, LIST[[rootFile[file]]]]};
IF btree.tree = NIL THEN {
btree.tree _ BTree.New[
repPrim: [compare: Compare, entrySize: EntrySize],
storPrim: [BTreeAlpineVM.ReferencePage, BTreeAlpineVM.ReleasePage]]};
IF btree.storage = NIL 
THEN btree.storage _ BTreeAlpineVM.Open[openFileID, pageSize, 8, 1]
ELSE BTreeAlpineVM.ReOpen[btree.storage, openFileID, 1]; -- reuse backing VM
BTree.Open[
tree: btree.tree, storage: btree.storage, 
pageSize: pageSize*PrincOps.wordsPerPage,
initialize: initialize ! BTree.Error => GOTO damagedDirectory]; -- badSeal or wrongPageSize
IF initialize THEN { 
size: CARDINAL;
key: REF KeyObject;
WriteEntry: UNSAFE PROC[e: BTree.Entry] = UNCHECKED BEGIN
filePtr: LONG POINTER TO EntryObject.file = LOOPHOLE[e];
IF filePtr = NIL THEN RETURN;
filePtr^ _ [SIZE[EntryObject.file], 0, directoryVersion, , file[file]];
filePtr.nameBody _ AppendText[filePtr, directoryName];
END;
key _ NEW[KeyObject _ [directoryVersion, directoryName]];
size _ SIZE[TextRep[directoryName.Length[]]] + SIZE[EntryObject.file];
TRUSTED {BTree.UpdateEntry[btree.tree, key, NIL, FALSE, size, WriteEntry
! BTree.Error => GOTO damagedDirectory]};
FreeKey[key]};
initialize _ FALSE;
RETURN[btree];
EXITS damagedDirectory => ERROR AD.Error[damagedDirectory];
END;

KeyObject: TYPE = RECORD[version: AD.Version, nameBody: Rope.Text];
stockKey: REF KeyObject _ NIL;

NewKey: ENTRY PROC
[version: AD.Version, nameBody: Rope.Text]
RETURNS[key: REF KeyObject] = BEGIN
IF nameBody = NIL THEN RETURN[NIL];
IF stockKey = NIL THEN stockKey _ NEW[KeyObject];
key _ stockKey; 
stockKey _ NIL;
key^ _ [version, nameBody];
END;

FreeKey: PROC
[key: REF KeyObject] = INLINE BEGIN
IF key # NIL THEN stockKey _ key;
END;

RecordObject: TYPE = EntryObject;

EntryObject: TYPE = MACHINE DEPENDENT RECORD [ -- corresponds to BTree.Entry
size(0): CARDINAL, -- size in words of entire entry, including TextRep's at end
keep(1): CARDINAL, -- cached value of the file's keep
version(2): CARDINAL, -- version part of FName
nameBody(3): TextRP, -- FName w/o version
rest(4): SELECT type(4): * FROM
link => [link(5): TextRP], -- includes optional version
file => [file(5): AE.UniversalFile],
ENDCASE
];
EntryPtr: TYPE = LONG BASE POINTER TO EntryObject;
TextRP: TYPE = EntryPtr RELATIVE POINTER TO TextRep;
TextRep: TYPE = Rope.RopeRep.text;
pageSize: NAT = 5;

EntrySize: BTree.EntrySize  
-- [entry: BTree.Entry] 
-- RETURNS [words: BTree.EntSize] -- = TRUSTED BEGIN
RETURN[LOOPHOLE[entry, EntryPtr].size];
END;

Compare: BTree.Compare 
-- RETURNS [PrincOps.Comparison] -- = TRUSTED BEGIN
keyRef: REF KeyObject = NARROW[key];
keyName: Rope.Text = keyRef.nameBody;
entryPtr: EntryPtr = LOOPHOLE[entry, EntryPtr];
entryName: LONG POINTER TO TextRep = @entryPtr[entryPtr.nameBody];
lenKey: CARDINAL = keyName.length;
lenEntry: CARDINAL = entryName.length;
FOR i: CARDINAL IN [ 0 .. MIN[lenKey, lenEntry] ) DO
cKey: CHAR = Ascii.Upper[keyName[i]];
cEntry: CHAR = Ascii.Upper[entryName[i]];
SELECT cKey FROM
< cEntry => RETURN [less];
> cEntry => RETURN [greater];
ENDCASE;
ENDLOOP;
SELECT lenKey FROM
< lenEntry => RETURN [less];
> lenEntry => RETURN [greater];
ENDCASE =>
SELECT keyRef.version FROM
< entryPtr.version => RETURN [less];
> entryPtr.version => RETURN [greater];
ENDCASE => RETURN [equal];
END;

EntryNameMatches: PROC 
[nameBody: Rope.Text, entryPtr: EntryPtr] 
RETURNS[BOOLEAN] = TRUSTED BEGIN
entryName: LONG POINTER TO TextRep = @entryPtr[entryPtr.nameBody];
IF entryName.length # nameBody.length THEN RETURN[FALSE];
FOR i: CARDINAL IN [0 .. nameBody.length) DO
IF Ascii.Upper[entryName[i]] # Ascii.Upper[nameBody[i]] THEN RETURN[FALSE];
ENDLOOP;
RETURN[TRUE];
END;

AppendText: PROC 
[eP: EntryPtr, text: Rope.Text] 
RETURNS [textRP: TextRP] = TRUSTED BEGIN
textRep: LONG POINTER TO TextRep;
size: CARDINAL _ SIZE[TextRep[text.length]];
textRP _ LOOPHOLE[eP.size];
textRep _ @eP[textRP];
PrincOpsUtils.LongCOPY [
from: LOOPHOLE[text],
nwords: size,
to: textRep
];
eP.size _ eP.size+size;
END;

GetText: PROC 
[eP: EntryPtr, textRP: TextRP] 
RETURNS[text: Rope.Text] = TRUSTED BEGIN
textRep: LONG POINTER TO TextRep _ @eP[textRP];
size: CARDINAL _ SIZE[TextRep[textRep.length]];
text _ NEW[TextRep[textRep.length]];
PrincOpsUtils.LongCOPY [
from: textRep,
nwords: size,
to: LOOPHOLE[text]
];
END;

InitIsLegal[];
InitializeFinalization[];

END . . .
-- AlpineDirectoryBTreeImpl.mesa
-- Last Edited by: Maxwell, November 23, 1983 11:13 am
Last Edited by: Hauser, December 18, 1984 4:36:55 pm PST
-- **********************************************************
-- general operations
-- **********************************************************

Get an entry handle corresponding to start.
See if we need to reparse the pattern.
Are we just enumerating top level directories?
Are we just enumerating subdirectories?
Enumerate to get the next entry.
Get then next name or the next entry.
We found a new subdirectory.
Create a new entry handle for that owner.
For now, assume that there is only one volume group per server.
The name will usually be a Rope.Text since that is what RPC produces.
extract the volume name
extract the owner 
extract and normalize the nameBody
extract the version
-- **********************************************************
-- Managing the BTree cache.
-- **********************************************************
For each BTree, there can be at most one BTree handle open per transaction.  This constraint is enforced by requiring all BTrees to be obtained through a centralized cache of EntryHandles.   In addition to the BTree handle, each ADBTree.EntryHandle caches information that will speed up enumerations.  There may be several EntryHandles with the same BTree handle. 

Look for an existing handle that isn't being used.
Find a place in the cache for a new entry handle.
Flush out the old entry.
deadBTree _ cache[index].btree;
Create an new entry.
SafeStorage.EnableFinalization[entry]; -- Finalization is incorrect.  Disable until fixed.
-- **********************************************************
-- Global BTree operations
-- **********************************************************


Look for an existing directory file.

Create a new directory file.
The following try to open readWrite, followed by an open readOnly if the first failed is a kludge of the first order.  Need a way to open with maximum permission allowed.  Also, there may be bad effects of having the directory open readOnly and cached.  Investigate this! -- Carl Hauser January 18, 1985
Write the file back into the owner data base.
Open the BTree.
-- put the directory file in the directory
-- **********************************************************
-- Key representation
-- **********************************************************

-- **********************************************************
-- Entry representation
-- **********************************************************

-- here follow the necessary TextRep's
-- [key: BTree.Key, entry: BTree.Entry] 
chh December 18, 1984 Enumerate doesn't work right for patterns without version numbers.  It may return the specified previous file which is, of course, incorrect.  I have NOT fixed this problem.
Κ/–

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