DIRECTORY
Atom,
Booting,
FS USING [Error, StreamOpen],
Commander,
Convert USING [RopeFromCard, RopeFromRope],
DB,
DBIcons,
IO,
Basics USING[LowHalf],
FileNames USING[CurrentWorkingDirectory],
IOClasses USING [CreateCommentFilterStream ],
Icons USING [NewIconFromFile, IconFlavor],
List USING[ DotCons, DottedPair, AList ],
MessageWindow USING [Append, Blink],
Process,
ProcessProps USING[ AddPropList ],
VM USING [AddressFault],
Rope USING [Cat, Equal, ROPE],
UserCredentials USING[Get, CredentialsChangeProc, RegisterForChange];


DBIconsImpl: CEDAR MONITOR

IMPORTS Basics, Booting, FS, FileNames, Commander, Convert, IO, MessageWindow, Process, ProcessProps, VM,  Rope, Icons, DB, List, UserCredentials, IOClasses

EXPORTS DBIcons 

= BEGIN 
OPEN DB, Rope;
Failed: PUBLIC ERROR [why: DBIcons.Failure, reason: Rope.ROPE] = CODE;
ROPE: TYPE = Rope.ROPE;
IconRelation: DB.Relation;  -- the relation giving the properties of an icon
IconFileAttr: DB.Attribute;  -- the name of the file for an icon
IconIndexAttr: DB.Attribute;  -- the index in the file
IconNameAttr: DB.Attribute; -- the icon itself

iconCache: List.AList _ NIL;  -- the internal cache of mappings from icon names to flavors

searchRuleList: LIST OF Rope.ROPE;

IconDB: PUBLIC ROPE _ NIL;

stopped: BOOL _ TRUE;

iconTransaction: DB.Transaction;

activity: BOOL _ TRUE;

ticksToWait: Process.Ticks _ Process.SecondsToTicks[5*60];

readOnly: PUBLIC BOOLEAN _ TRUE;  -- true if the segment is readonly

defaultDatabase: PUBLIC ROPE _ "[Luther.Alpine]<CedarDoc>Icons.Segment";

workingDirectory: Rope.ROPE _ FileNames.CurrentWorkingDirectory[];

myProps: Atom.DottedPair _ NEW[Atom.DottedPairNode _ [key: $WorkingDirectory, val: workingDirectory]];

WatchDBActivity: PROC[] = {
WHILE TRUE DO
Process.Pause[ticksToWait];
CheckConnection[]
ENDLOOP
 };

CheckConnection: ENTRY PROC[] = {
ENABLE UNWIND => NULL;
IF NOT activity THEN CloseTransaction[ ];
activity _ FALSE };

EstablishIconDB: PUBLIC ENTRY PROC [file: Rope.ROPE] = {
ENABLE UNWIND => NULL;
IF Rope.Equal[IconDB, file] THEN RETURN;
IconDB _ file;
stopped _ TRUE; -- protection against errors that might arise in the opening
CloseTransaction[];
OpenDB[];
stopped _ FALSE }; 

OpenTransaction: INTERNAL PROC [] = {
IF iconTransaction = NIL THEN DB.OpenTransaction[$Icons];
iconTransaction _ DB.GetSegmentInfo[$Icons].trans };

Close: PUBLIC ENTRY PROC [] = {
ENABLE UNWIND => NULL;
CloseTransaction[];
stopped _ TRUE }; 

CloseTransaction: INTERNAL PROC [] = {
aborted: BOOL _ FALSE;
IF iconTransaction = NIL THEN iconTransaction _ DB.GetSegmentInfo[$Icons].trans;
IF iconTransaction = NIL THEN RETURN;
DB.CloseTransaction[iconTransaction !
DB.Aborted => { aborted _ TRUE; CONTINUE };
DB.Error, DB.Failure => CONTINUE ];
IF aborted THEN DB.AbortTransaction[iconTransaction];
iconTransaction _ NIL }; 
RegisterIcon: PUBLIC ENTRY PROC[iconName: Rope.ROPE, fileName: Rope.ROPE, index: CARDINAL] = { 
ENABLE UNWIND => NULL;
[] _ InternalRegisterIcon[iconName, fileName, index]
}; 

GetIcon: PUBLIC ENTRY PROC [iconName: Rope.ROPE, default: Icons.IconFlavor _ unInit] RETURNS [Icons.IconFlavor] = {
ENABLE UNWIND => NULL;
RETURN[InternalGetIcon[iconName, default]];
 };

InternalGetIcon: INTERNAL PROC[iconName: Rope.ROPE, default: Icons.IconFlavor _ unInit] RETURNS [Icons.IconFlavor] = {
cachedFlavor: REF ANY = CheckCache[iconName];
flavor: Icons.IconFlavor _ unInit;
success: BOOL;
DoGetIcon: PROC[] = {
attributeValue: DB.AttributeValue = [attribute: IconNameAttr, lo: S2V[iconName]];
iconRelship: DB.Relship = DeclareRelship[IconRelation, LIST[attributeValue], OldOnly];
IF iconRelship = NIL THEN {flavor _ default; RETURN};
BEGIN
fileName: ROPE = V2S[ GetF[iconRelship, IconFileAttr] ];
index: CARDINAL = Basics.LowHalf[LOOPHOLE[V2I[GetF[iconRelship, IconIndexAttr]]]];
FetchIcon: PROC[] = {
flavor _ Icons.NewIconFromFile[fileName, index !
VM.AddressFault =>
IF default # unInit THEN {flavor _ default; CONTINUE}
ELSE ERROR Failed[invalidIndex, Convert.RopeFromCard[index]];
FS.Error => 
IF default # unInit THEN {flavor _ default; CONTINUE}
ELSE ERROR Failed[fileNotFound, fileName]] };
ProcessProps.AddPropList[LIST[myProps], FetchIcon]
END };
IF cachedFlavor # NIL THEN RETURN[NARROW[cachedFlavor, REF Icons.IconFlavor]^];
IF IconDB = NIL THEN RETURN[default];
success _ CarefullyApply[DoGetIcon];
IF NOT success THEN RETURN[default];
IF flavor # unInit THEN {
iconCache _ Cache[List.DotCons[iconName, NEW[Icons.IconFlavor _ flavor]], iconCache];
RETURN[flavor] };
IF default # unInit THEN RETURN[default];
ERROR Failed[noSuchIcon, iconName]
 }; 

InternalCheckRegistry: INTERNAL PROC[name: ROPE] RETURNS[fileName: ROPE, i: CARDINAL] = {
attributeValue: DB.AttributeValue = [attribute: IconNameAttr, lo: S2V[name]];
iconRelship: DB.Relship = DeclareRelship[IconRelation, LIST[attributeValue], OldOnly];
IF iconRelship = NIL THEN { fileName _ NIL; i _ 0 }
ELSE {
fileName _ V2S[ GetF[ iconRelship, IconFileAttr ] ];
   i _ Basics.LowHalf[LOOPHOLE[V2I[GetF[iconRelship, IconIndexAttr]]]] } };

Cache: INTERNAL PROC[ pair: List.DottedPair, aList: List.AList ] RETURNS[ List.AList ] = { 
x, x1: List.AList _ NIL;
x _ aList;
UNTIL x = NIL DO
IF Rope.Equal[NARROW[x.first.key, ROPE], NARROW[pair.key, ROPE]] THEN
BEGIN
x.first.val _ pair.val;
RETURN[aList];
END;
x1_x;
x _ x.rest;
ENDLOOP;
x _ CONS[pair, NIL];
IF x1 = NIL THEN RETURN[x]
ELSE IF x1.rest = NIL THEN x1.rest _ x -- add at end
ELSE ERROR ; -- defensive programming
RETURN[aList];
};

CheckCache: INTERNAL PROC[name: Rope.ROPE] RETURNS[ val: REF ANY ] = { 
FOR iconList: List.AList  _ iconCache, iconList.rest UNTIL iconList = NIL DO
IF Rope.Equal[NARROW[iconList.first.key, Rope.ROPE], name] THEN RETURN[iconList.first.val]
ENDLOOP;
RETURN[NIL] };

SetDefaultIcons: INTERNAL PROC[] = { 
Typescript: Rope.ROPE = "Typescript";
Document: Rope.ROPE = "Document";
Tool: Rope.ROPE = "Tool";
IF CheckCache["Tool"] = NIL THEN {
iconCache _ CONS[List.DotCons[Typescript, NEW[Icons.IconFlavor _ Icons.IconFlavor[typescript]]], iconCache];
iconCache _ CONS[List.DotCons[Document, NEW[Icons.IconFlavor _ Icons.IconFlavor[document]]], iconCache];
iconCache _ CONS[List.DotCons[Tool, NEW[Icons.IconFlavor _ Icons.IconFlavor[tool]]], iconCache] }
};

Exists: PUBLIC ENTRY PROC[name: Rope.ROPE] RETURNS[yes: BOOLEAN] = {
ENABLE UNWIND => NULL;
DoCheck: INTERNAL PROC[] = { yes _ InternalCheckRegistry[name].fileName # NIL };
yes _ FALSE; [] _ CarefullyApply[DoCheck] };

Registration: PUBLIC ENTRY PROC[iconName: Rope.ROPE] RETURNS[file: Rope.ROPE, index: CARDINAL] = {
ENABLE UNWIND => NULL;
DoRegisterCheck: INTERNAL PROC[] = { [file, index] _ InternalCheckRegistry[iconName] };
IF NOT CarefullyApply[DoRegisterCheck] THEN RETURN[NIL, 0] };

FlushCache: PUBLIC ENTRY PROC [iconName: Rope.ROPE _ NIL] = {
ENABLE UNWIND => NULL;
IF iconName = NIL THEN InternalInvalidateCache[]
ELSE iconCache _ Cache[ List.DotCons[iconName, NIL], iconCache ]
};

InternalInvalidateCache: INTERNAL PROC [] = {
iconCache _ NIL };

InternalRegisterIcon: INTERNAL PROC[iconName: Rope.ROPE, fileName: Rope.ROPE, index: CARDINAL] RETURNS[success: BOOLEAN] = {
DoRegisterIcon: PROC[] = { 
attributeValue: DB.AttributeValue = [IconNameAttr, iconName];
iconRel: Relship = DeclareRelship[IconRelation, LIST[attributeValue]];
SetF[iconRel, IconFileAttr, S2V[fileName]];
SetF[iconRel, IconIndexAttr, U2V[index]];
DB.MarkTransaction[DB.GetSegmentInfo[$Icons].trans] };
IF readOnly OR IconDB = NIL THEN RETURN[FALSE];
success _ CarefullyApply[DoRegisterIcon] };
Parse: INTERNAL PROCEDURE[ stream: IO.STREAM, errlog: IO.STREAM ]  = {
OPEN IO;
error: BOOLEAN _ FALSE;
iconName, fileName: Rope.ROPE;
index: CARDINAL;
{ ENABLE IO.EndOfStream => GOTO Out;
DO
iconName _ IO.GetRopeLiteral[stream];
fileName _ IO.GetTokenRope[stream, IO.IDProc].token;
index _ IO.GetCard[stream];
IF NOT InternalRegisterIcon[iconName, fileName, index] THEN
{ error _ TRUE;
  Report[msg: Rope.Cat["Transaction Aborted at: ",
Convert.RopeFromCard[stream.GetIndex[]]], errLog: errlog];
  GOTO Out }
ENDLOOP;
EXITS
Out => NULL;
};
IF error THEN {
MessageWindow.Append["problems encountered in reading icon file."];
MessageWindow.Blink[];
IF errlog # NIL THEN errlog.Close[];
};
};

WriteCatalogue: PUBLIC ENTRY PROC [file: Rope.ROPE] = {
ENABLE UNWIND => NULL;
stream: IO.STREAM;
InternalWrite: PROC[] = {
OPEN IO;
iconRels: RelshipSet = RelationSubset[IconRelation];
FOR r: Relship _ NextRelship[iconRels], NextRelship[iconRels] UNTIL r = NIL DO
fileName: ROPE = V2S[ GetF[r, IconFileAttr] ];
iconName: ROPE = V2S[ GetF[r, IconNameAttr] ];
index: CARDINAL = Basics.LowHalf[LOOPHOLE[V2I[GetF[r, IconIndexAttr]]]];
stream.PutF["\n%g %g %d", rope[Convert.RopeFromRope[iconName]], rope[fileName], int[index]];
ENDLOOP;
stream.Close[] };
stream _ FS.StreamOpen[file, $append ! FS.Error => {stream _ NIL; CONTINUE}];
IF stream # NIL THEN [] _ CarefullyApply[InternalWrite]
};

Report: INTERNAL PROCEDURE [msg: Rope.ROPE, errLog: IO.STREAM] = {
OPEN IO;
IF errLog # NIL THEN errLog.PutF["\n\n%g", rope[msg]]; 
};

UserChanged: ENTRY UserCredentials.CredentialsChangeProc = {
ENABLE UNWIND => NULL;
user: Rope.ROPE = UserCredentials.Get[].name;
searchRuleList _ LIST["///Commands/", Rope.Cat["///Users/", user, "/Commands/"]];
CloseTransaction[];
stopped _ TRUE };

ResetSchema: INTERNAL PROC[] = {
OpenTransaction[];
IF NOT DB.Null[IconRelation] THEN RETURN; -- all is well, don't bother flushing cache
IconRelation _ DeclareRelation[ "IconInfo", $Icons ];
IconFileAttr _ DeclareAttribute[IconRelation, "file", RopeType];
IconIndexAttr _ DeclareAttribute[IconRelation, "index", IntType];
IconNameAttr _ DeclareAttribute[IconRelation, "name", RopeType, Key];
[] _ DeclareIndex[IconRelation, LIST[IconNameAttr]];
InternalInvalidateCache[];
SetDefaultIcons[] };

ReadCatalogue: PUBLIC ENTRY PROC[file: Rope.ROPE, errlog: IO.STREAM _ NIL] = TRUSTED {
ENABLE UNWIND => NULL;
stream: IO.STREAM;
stream _ FS.StreamOpen[file ! FS.Error => { stream _ NIL; CONTINUE }];
IF stream = NIL THEN RETURN;
stream _ IOClasses.CreateCommentFilterStream[stream];
Parse[ stream, errlog ];
DB.MarkTransaction[DB.GetSegmentInfo[$Icons].trans] };

CarefullyApply: INTERNAL PROC [proc: PROC[]] RETURNS [succeeded: BOOL] ~ {
ENABLE DB.Error, DB.Failure, DB.Aborted => {succeeded _ FALSE; CONTINUE};
aborted: BOOL _ FALSE;
succeeded _ TRUE;
IF stopped THEN RETURN;
BEGIN
ENABLE DB.Aborted => { aborted _ TRUE; CONTINUE };
ResetSchema[];
proc[]
END;
IF NOT aborted THEN RETURN; -- no aborted occurred
DB.AbortTransaction[iconTransaction];
ResetSchema[];
proc[]; -- don't bother trying to restart here --
};

OpenDB: INTERNAL PROC [] ~ {
ENABLE DB.Aborted, DB.Failure, DB.Error => CONTINUE;
segmentNumber: NAT = 140B;
readOnly _ FALSE;
DB.Initialize[nCachePages: 256];
DB.DeclareSegment[IconDB, $Icons, segmentNumber, FALSE];
OpenTransaction[! DB.Error =>
TRUSTED {IF code = ProtectionViolation THEN { readOnly _ TRUE; CONTINUE }
ELSE GOTO AlreadyDone } ];
IF readOnly THEN {
CloseTransaction[];
DB.DeclareSegment[IconDB, $Icons, segmentNumber, TRUE, FALSE] }
ELSE CloseTransaction[]  -- throw away this worthless transaction
EXITS
AlreadyDone => CloseTransaction[! DB.Error, DB.Failure => CONTINUE]
};

OpenIt: Commander.CommandProc = {
h: IO.STREAM = IO.RIS[cmd.commandLine];
name: ROPE;
[] _ h.SkipWhitespace[];
IF h.EndOf THEN name _ NIL ELSE name _ h.GetLineRope[];
IF Rope.Equal[name, ""] THEN 
IF IconDB # NIL THEN name _ IconDB
ELSE msg _ "Must supply a database name";
EstablishIconDB[name]
};

CloseIt: Commander.CommandProc = { Close[] };

OpenUp: Booting.RollbackProc = { DB.Initialize[nCachePages: 256] };

CloseTrans: ENTRY Booting.CheckpointProc = {
ENABLE UNWIND => NULL;
CloseTransaction[]; stopped _ TRUE };
TRUSTED {
searchRuleList _ LIST["///Commands/", Rope.Cat["///Users/", UserCredentials.Get[].name, "/Commands/"]];
UserCredentials.RegisterForChange[UserChanged];
Booting.RegisterProcs[c: CloseTrans, r: OpenUp];
Commander.Register[key: "OpenIconDB", proc: OpenIt, doc: "\nOpenIconDB <file> opens a new icon database (closing a previously open one, if necessary)"];
Commander.Register[key: "CloseIconDB", proc: CloseIt, doc: "\nCloseIconDB <file> closes the icon database"];
Process.Detach[FORK WatchDBActivity[]]
 };


END.

JFile: DBIconsImpl.mesa
Edited by Teitelman on July 18, 1984 9:12:44 am PDT
Copyright c 1985 by Xerox Corporation.  All rights reserved.
Edited by: Donahue, January 27, 1986 8:02:01 am PST
Last Edited by: Widom, August 8, 1984 9:14:17 pm PDT

Types
Global variables for accessing the database
The tuples in the relation have the structure
IconRelation[ IconNameAttr: ROPE, IconFileAttr: ROPE, IconIndexAttr: INT ]
Establishing the database
Accessing Icons
Changes RegisteredIcons.Catalogue to reflect the indicated association. This definition will replace any previous definition. comments are for inclusion in the catalogue to help the user figure out what the icon looks like. 
Obtain an icon flavor for the icon associated with iconName. Create a new icon flavor if one has not previously been created.
If for some reason it could not obtain the icon, and default # unInit, returns the default. Otherwise, raises Error (defined below) with appropriate parameters.
key not found on x
the test is here to make the operation idempotent
If an iconFlavor was previous created for this icon, discard the flavor, i.e. the next call to GetIcon will create a new flavor. If iconName = NIL, do this for all registered icons. For use by iconeditor. 
Throw the entire cache away. 
can't register things in this segment
Parsing Icon Catalogues
Reporting errors
Opening, closing segment, making/reading catalogue
this is a crock to see if the database really can be written to; you need to actually open a transaction to find this out
attempt to open for writing failed; declare it for reading only
Initialization
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