haiku-beta6/src/kits/tracker/Model.cpp

/*
Open Tracker License

Terms and Conditions

Copyright (c) 1991-2000, Be Incorporated. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice applies to all licensees
and shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF TITLE, MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
BE INCORPORATED BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of Be Incorporated shall not be
used in advertising or otherwise to promote the sale, use or other dealings in
this Software without prior written authorization from Be Incorporated.

Tracker(TM), Be(R), BeOS(R), and BeIA(TM) are trademarks or registered trademarks
of Be Incorporated in the United States and other countries. Other brand product
names are registered trademarks or trademarks of their respective holders.
All rights reserved.
*/

//	Dedicated to BModel

// ToDo:
// Consider moving iconFrom logic to BPose
// use a more efficient way of storing file type and preferred app strings

#include <stdlib.h>
#include <string.h>

#include <fs_info.h>
#include <fs_attr.h>

#include <AppDefs.h>
#include <Bitmap.h>
#include <Debug.h>
#include <Directory.h>
#include <Entry.h>
#include <File.h>
#include <NodeInfo.h>
#include <NodeMonitor.h>
#include <Path.h>
#include <SymLink.h>
#include <Query.h>
#include <Volume.h>
#include <VolumeRoster.h>

#include "Model.h"

#include "Attributes.h"
#include "Bitmaps.h"
#include "FindPanel.h"
#include "FSUtils.h"
#include "MimeTypes.h"
#include "IconCache.h"
#include "Tracker.h"
#include "Utilities.h"

#ifdef CHECK_OPEN_MODEL_LEAKS
BObjectList<Model> *writableOpenModelList = NULL;
BObjectList<Model> *readOnlyOpenModelList = NULL;
#endif

namespace BPrivate {
extern
#ifdef _IMPEXP_BE
_IMPEXP_BE
#endif
bool CheckNodeIconHintPrivate(const BNode *, bool);
}


Model::Model()
	:
	fPreferredAppName(NULL),
	fBaseType(kUnknownNode),
	fIconFrom(kUnknownSource),
	fWritable(false),
	fNode(NULL),
	fStatus(B_NO_INIT)
{
}


Model::Model(const Model &cloneThis)
	:
	fEntryRef(cloneThis.fEntryRef),
	fMimeType(cloneThis.fMimeType),
	fPreferredAppName(NULL),
	fBaseType(cloneThis.fBaseType),
	fIconFrom(cloneThis.fIconFrom),
	fWritable(false),
	fNode(NULL)
{
	fStatBuf.st_dev = cloneThis.NodeRef()->device;
	fStatBuf.st_ino = cloneThis.NodeRef()->node;
	
	if (cloneThis.IsSymLink() && cloneThis.LinkTo())
		fLinkTo = new Model(*cloneThis.LinkTo());

	fStatus = OpenNode(cloneThis.IsNodeOpenForWriting());
	if (fStatus == B_OK) {
		ASSERT(fNode);
		fNode->GetStat(&fStatBuf);
		ASSERT(fStatBuf.st_dev == cloneThis.NodeRef()->device);
		ASSERT(fStatBuf.st_ino == cloneThis.NodeRef()->node);
	}
	if (!cloneThis.IsNodeOpen())
		CloseNode();
}


Model::Model(const node_ref *dirNode, const node_ref *node, const char *name,
	bool open, bool writable)
	:
	fPreferredAppName(NULL),
	fWritable(false),
	fNode(NULL)
{
	SetTo(dirNode, node, name, open, writable);
}


Model::Model(const BEntry *entry, bool open, bool writable)
	:
	fPreferredAppName(NULL),
	fWritable(false),
	fNode(NULL)
{
	SetTo(entry, open, writable);
}


Model::Model(const entry_ref *ref, bool traverse, bool open, bool writable)
	:
	fPreferredAppName(NULL),
	fBaseType(kUnknownNode),
	fIconFrom(kUnknownSource),
	fWritable(false),
	fNode(NULL)
{
	BEntry entry(ref, traverse);
	fStatus = entry.InitCheck();
	if (fStatus == B_OK)
		SetTo(&entry, open, writable);
}


void 
Model::DeletePreferredAppVolumeNameLinkTo()
{
	if (IsSymLink()) {
		Model *tmp = fLinkTo;
			// deal with link to link to self
		fLinkTo = NULL;
		delete tmp;

	} else if (IsVolume())
		free(fVolumeName);
	else
		free(fPreferredAppName);

	fPreferredAppName = NULL;
}


Model::~Model()
{
#ifdef CHECK_OPEN_MODEL_LEAKS
	if (writableOpenModelList) 
		writableOpenModelList->RemoveItem(this);
	if (readOnlyOpenModelList) 
		readOnlyOpenModelList->RemoveItem(this);
#endif

	DeletePreferredAppVolumeNameLinkTo();
	if (IconCache::NeedsDeletionNotification((IconSource)fIconFrom))
		// this check allows us to use temporary Model in the IconCache
		// without the danger of a deadlock
		IconCache::sIconCache->Deleting(this);
#if xDEBUG
	if (fNode)
		PRINT(("destructor closing node for %s\n", Name()));
#endif

	delete fNode;
}


status_t 
Model::SetTo(const BEntry *entry, bool open, bool writable)
{
	delete fNode;
	fNode = NULL;
	DeletePreferredAppVolumeNameLinkTo();
	fIconFrom = kUnknownSource;
	fBaseType = kUnknownNode;
	fMimeType = "";

	fStatus = entry->GetRef(&fEntryRef);
	if (fStatus != B_OK)
		return fStatus;
	
	fStatus = entry->GetStat(&fStatBuf);
	if (fStatus != B_OK)
		return fStatus;
	
	fStatus = OpenNode(writable);
	if (!open)
		CloseNode();
	
	return fStatus;
}


status_t 
Model::SetTo(const entry_ref *newRef, bool traverse, bool open, bool writable)
{
	delete fNode;
	fNode = NULL;
	DeletePreferredAppVolumeNameLinkTo();
	fIconFrom = kUnknownSource;
	fBaseType = kUnknownNode;
	fMimeType = "";

	BEntry tmpEntry(newRef, traverse);
	fStatus = tmpEntry.InitCheck();
	if (fStatus != B_OK)
		return fStatus;

	if (traverse)
		tmpEntry.GetRef(&fEntryRef);
	else
		fEntryRef = *newRef;

	fStatus = tmpEntry.GetStat(&fStatBuf);
	if (fStatus != B_OK)
		return fStatus;
	
	fStatus = OpenNode(writable);
	if (!open)
		CloseNode();
	
	return fStatus;
}


status_t 
Model::SetTo(const node_ref *dirNode, const node_ref *nodeRef, const char *name,
	bool open, bool writable)
{
	delete fNode;
	fNode = NULL;
	DeletePreferredAppVolumeNameLinkTo();
	fIconFrom = kUnknownSource;
	fBaseType = kUnknownNode;
	fMimeType = "";

	fStatBuf.st_dev = nodeRef->device;
	fStatBuf.st_ino = nodeRef->node;
	fEntryRef.device = dirNode->device;
	fEntryRef.directory = dirNode->node;
	fEntryRef.name = strdup(name);

	BEntry tmpNode(&fEntryRef);
	fStatus = tmpNode.InitCheck();
	if (fStatus != B_OK)
		return fStatus;
	
	fStatus = tmpNode.GetStat(&fStatBuf);
	if (fStatus != B_OK)
		return fStatus;

	fStatus = OpenNode(writable);

	if (!open)
		CloseNode();
	
	return fStatus;
}


status_t 
Model::InitCheck() const
{
	return fStatus;
}


int
Model::CompareFolderNamesFirst(const Model *compareModel) const
{
	if (compareModel == NULL)
		return -1;

	const Model *resolvedCompareModel = compareModel->ResolveIfLink();
	const Model *resolvedMe = ResolveIfLink();

	if (resolvedMe->IsVolume()) {
		if (!resolvedCompareModel->IsVolume())
			return -1;
	} else if (resolvedCompareModel->IsVolume())
		return 1;

	if (resolvedMe->IsDirectory()) {
		if (!resolvedCompareModel->IsDirectory())
			return -1;
	} else if (resolvedCompareModel->IsDirectory())
		return 1;

	return NaturalCompare(Name(), compareModel->Name());
}


const char *
Model::Name() const
{
	switch (fBaseType) {
		case kRootNode:
			return "Disks";
			
		case kVolumeNode:
			if (fVolumeName)
				return fVolumeName;
				
		case kTrashNode:
			return "Trash";
			
		default:
			break;

	}
	return fEntryRef.name;
}


status_t 
Model::OpenNode(bool writable)
{
	if (IsNodeOpen() && (writable == IsNodeOpenForWriting()))
		return B_OK;
	
	OpenNodeCommon(writable);
	return fStatus;
}


status_t 
Model::UpdateStatAndOpenNode(bool writable)
{
	if (IsNodeOpen() && (writable == IsNodeOpenForWriting()))
		return B_OK;
	
	// try reading the stat structure again
	BEntry tmpEntry(&fEntryRef);
	fStatus = tmpEntry.InitCheck();
	if (fStatus != B_OK)
		return fStatus;
	
	fStatus = tmpEntry.GetStat(&fStatBuf);
	if (fStatus != B_OK)
		return fStatus;

	OpenNodeCommon(writable);
	return fStatus;
}


status_t
Model::OpenNodeCommon(bool writable)
{
#if xDEBUG
	PRINT(("opening node for %s\n", Name()));
#endif

#ifdef CHECK_OPEN_MODEL_LEAKS
	if (writableOpenModelList) 
		writableOpenModelList->RemoveItem(this);
	if (readOnlyOpenModelList) 
		readOnlyOpenModelList->RemoveItem(this);
#endif

	if (fBaseType == kUnknownNode)
		SetupBaseType();

	switch (fBaseType) {
		case kPlainNode:
		case kExecutableNode:
		case kQueryNode:
		case kQueryTemplateNode:
			// open or reopen
			delete fNode;
			fNode = new BFile(&fEntryRef, (uint32)(writable ? O_RDWR : O_RDONLY));
			break;

		case kDirectoryNode:
		case kVolumeNode:
		case kRootNode:
		case kTrashNode:
			if (!IsNodeOpen())
				fNode = new BDirectory(&fEntryRef);

			if (fBaseType == kDirectoryNode
				&& static_cast<BDirectory *>(fNode)->IsRootDirectory()) {
				// promote from directory to volume
				fBaseType = kVolumeNode;
			}
			break;

		case kLinkNode:
			if (!IsNodeOpen()) {
				BEntry entry(&fEntryRef);
				fNode = new BSymLink(&entry);
			}
			break;

		default:
#if DEBUG
			PrintToStream();
#endif
			TRESPASS();
				// this can only happen if GetStat failed before, in which case
				// we shouldn't be here
			// ToDo: Obviously, we can also be here if the type could not be determined,
			// for example for block devices (so the TRESPASS() macro shouldn't be
			// used here)!
			return fStatus = B_ERROR;
	}

	fStatus = fNode->InitCheck();
	if (fStatus != B_OK) {
		delete fNode;
		fNode = NULL;
		// original code snoozed an error here and returned B_OK
		return fStatus;
	}

	fWritable = writable;

	if (!fMimeType.Length())
		FinishSettingUpType();

#ifdef CHECK_OPEN_MODEL_LEAKS
	if (fWritable) {
		if (!writableOpenModelList) {
			TRACE();
			writableOpenModelList = new BObjectList<Model>(100);
		}
		writableOpenModelList->AddItem(this);
	} else {
		if (!readOnlyOpenModelList) {
			TRACE();
			readOnlyOpenModelList = new BObjectList<Model>(100);
		}
		readOnlyOpenModelList->AddItem(this);
	}
#endif

	return fStatus;
}


void 
Model::CloseNode()
{
#if xDEBUG
	PRINT(("closing node for %s\n", Name()));
#endif

#ifdef CHECK_OPEN_MODEL_LEAKS
	if (writableOpenModelList) 
		writableOpenModelList->RemoveItem(this);
	if (readOnlyOpenModelList) 
		readOnlyOpenModelList->RemoveItem(this);
#endif

	delete fNode;
	fNode = NULL;
}


bool 
Model::IsNodeOpen() const
{
	return fNode != NULL;
}



bool 
Model::IsNodeOpenForWriting() const
{
	return fNode != NULL && fWritable;
}


void
Model::SetupBaseType()
{
	switch (fStatBuf.st_mode & S_IFMT) {
		case S_IFDIR:
			// folder
			fBaseType = kDirectoryNode;
			break;

		case S_IFREG:
			// regular file
			if (fStatBuf.st_mode & S_IXUSR) 
				// executable
				fBaseType = kExecutableNode;
			else 
				// non-executable
				fBaseType = kPlainNode;
			break;

		case S_IFLNK:
			// symlink
			fBaseType = kLinkNode;
			break;

		default:
			fBaseType = kUnknownNode;
			break;
	}
}


static bool
HasVectorIconHint(BNode *node)
{
	attr_info info;
	return node->GetAttrInfo(kAttrIcon, &info) == B_OK;
}


void
Model::FinishSettingUpType()
{
	char mimeString[B_MIME_TYPE_LENGTH];
	BEntry entry;

	// while we are reading the node, do a little
	// snooping to see if it even makes sense to look for a node-based
	// icon
	// This serves as a hint to the icon cache, allowing it to not hit the
	// disk again for models that do not have an icon defined by the node
	if (IsNodeOpen()
		&& fBaseType != kLinkNode
		&& !CheckNodeIconHintPrivate(fNode, dynamic_cast<TTracker *>(be_app) == NULL)
		&& !HasVectorIconHint(fNode)) {
			// when checking for the node icon hint, if we are libtracker, only check
			// for small icons - checking for the large icons is a little more
			// work for the filesystem and this will speed up the test.
			// This makes node icons only work if there is a small and a large node
			// icon on a file - for libtracker that is not a problem though
		fIconFrom = kUnknownNotFromNode;
	}

	if (fBaseType != kDirectoryNode
		&& fBaseType != kVolumeNode
		&& fBaseType != kLinkNode
		&& IsNodeOpen()) {
		BNodeInfo info(fNode);

		// check if a specific mime type is set
		if (info.GetType(mimeString) == B_OK) {
			// node has a specific mime type
			fMimeType = mimeString;
			if (strcmp(mimeString, B_QUERY_MIMETYPE) == 0)
				fBaseType = kQueryNode;
			else if (strcmp(mimeString, B_QUERY_TEMPLATE_MIMETYPE) == 0)
				fBaseType = kQueryTemplateNode;

			if (info.GetPreferredApp(mimeString) == B_OK) {
				if (fPreferredAppName)
					DeletePreferredAppVolumeNameLinkTo();

				if (mimeString[0])
					fPreferredAppName = strdup(mimeString); 
			}
		}
	}

	switch (fBaseType) {
		case kDirectoryNode:
			entry.SetTo(&fEntryRef);
			if (entry.InitCheck() == B_OK && FSIsTrashDir(&entry)) 
				fBaseType = kTrashNode;
			
			fMimeType = B_DIR_MIMETYPE;	// should use a shared string here
			if (IsNodeOpen()) {
				BNodeInfo info(fNode);
				if (info.GetType(mimeString) == B_OK)
					fMimeType = mimeString;

				if (fIconFrom == kUnknownNotFromNode
					&& WellKnowEntryList::Match(NodeRef()) > (directory_which)-1)
					// one of home, beos, system, boot, etc.
					fIconFrom = kTrackerSupplied;
			}
			break;

		case kVolumeNode:
		{
			if (NodeRef()->node == fEntryRef.directory
				&& NodeRef()->device == fEntryRef.device) {
				// promote from volume to file system root
				fBaseType = kRootNode;
				fMimeType = B_ROOT_MIMETYPE;
				break;
			}

			// volumes have to have a B_VOLUME_MIMETYPE type
			fMimeType = B_VOLUME_MIMETYPE;
			if (fIconFrom == kUnknownNotFromNode) {
				if (WellKnowEntryList::Match(NodeRef()) > (directory_which)-1)
					fIconFrom = kTrackerSupplied;
				else
					fIconFrom = kVolume;
			}

			char name[B_FILE_NAME_LENGTH];
			BVolume	volume(NodeRef()->device);
			if (volume.InitCheck() == B_OK && volume.GetName(name) == B_OK) {
				if (fVolumeName)
					DeletePreferredAppVolumeNameLinkTo();

				fVolumeName = strdup(name);
			}
#if DEBUG
			else
				PRINT(("get volume name failed for %s\n", fEntryRef.name));
#endif
			break;
		}

		case kLinkNode:
			fMimeType = B_LINK_MIMETYPE;	// should use a shared string here
			break;

		case kExecutableNode:
			if (IsNodeOpen()) {
				char signature[B_MIME_TYPE_LENGTH];
				if (GetAppSignatureFromAttr(dynamic_cast<BFile *>(fNode), signature)
					== B_OK) {

					if (fPreferredAppName)
						DeletePreferredAppVolumeNameLinkTo();

					if (signature[0])
						fPreferredAppName = strdup(signature); 
				}
			}
			if (!fMimeType.Length())
				fMimeType = B_APP_MIME_TYPE;	// should use a shared string here
			break;

		default:
			if (!fMimeType.Length())
				fMimeType = B_FILE_MIMETYPE;
			break;
	}
}


void 
Model::ResetIconFrom()
{
	BModelOpener opener(this);

	if (InitCheck() != B_OK)
		return;

	// mirror the logic from FinishSettingUpType
	if ((fBaseType == kDirectoryNode || fBaseType == kVolumeNode
		|| fBaseType == kTrashNode)
		&& !CheckNodeIconHintPrivate(fNode, dynamic_cast<TTracker *>(be_app) == NULL)) {
		if (WellKnowEntryList::Match(NodeRef()) > (directory_which)-1) {
			fIconFrom = kTrackerSupplied;
			return;
		} else if (dynamic_cast<BDirectory *>(fNode)->IsRootDirectory()) {
			fIconFrom = kVolume;
			return;
		}
	}
	fIconFrom = kUnknownSource;
}


const char *
Model::PreferredAppSignature() const
{
	if (IsVolume() || IsSymLink())
		return "";

	return fPreferredAppName ? fPreferredAppName : "";
}


void 
Model::SetPreferredAppSignature(const char *signature)
{
	ASSERT(!IsVolume() && !IsSymLink());
	ASSERT(signature != fPreferredAppName);
		// self assignment should not be an option

	free(fPreferredAppName);
	if (signature)
		fPreferredAppName = strdup(signature);
	else
		fPreferredAppName = NULL;
}


const Model *
Model::ResolveIfLink() const
{
	if (!IsSymLink())
		return this;

	if (!fLinkTo)
		return this;

	return fLinkTo;
}


Model *
Model::ResolveIfLink()
{
	if (!IsSymLink())
		return this;

	if (!fLinkTo)
		return this;

	return fLinkTo;
}


void 
Model::SetLinkTo(Model *model)
{
	ASSERT(IsSymLink());
	ASSERT(!fLinkTo || (fLinkTo != model));

	if (fLinkTo)
		delete fLinkTo;
	fLinkTo = model;
}


void 
Model::GetPreferredAppForBrokenSymLink(BString &result)
{
	if (!IsSymLink() || LinkTo()) {
		result = "";
		return;
	}

	BModelOpener opener(this);
	BNodeInfo info(fNode);		
	status_t error = info.GetPreferredApp(result.LockBuffer(B_MIME_TYPE_LENGTH));
	result.UnlockBuffer();

	if (error != B_OK)
		// Tracker will have to do
		result = kTrackerSignature;
}


// Node monitor updating stuff

void
Model::UpdateEntryRef(const node_ref *dirNode, const char *name)
{
	if (IsVolume()) {
		if (fVolumeName)
			DeletePreferredAppVolumeNameLinkTo();
	
		fVolumeName = strdup(name);
	}

	fEntryRef.device = dirNode->device;
	fEntryRef.directory = dirNode->node;

	if (fEntryRef.name && strcmp(fEntryRef.name, name) == 0)
		return;

	fEntryRef.set_name(name);
}


status_t 
Model::WatchVolumeAndMountPoint(uint32 , BHandler *target)
{
	ASSERT(IsVolume());
	
	if (fEntryRef.name && fVolumeName
		&& strcmp(fEntryRef.name, "boot") == 0) {
		// watch mount point for boot volume
		BString bootMountPoint("/");
		bootMountPoint += fVolumeName;
		BEntry mountPointEntry(bootMountPoint.String());
		Model mountPointModel(&mountPointEntry);

		TTracker::WatchNode(mountPointModel.NodeRef(), B_WATCH_NAME
			| B_WATCH_STAT | B_WATCH_ATTR, target);
	}

	return TTracker::WatchNode(NodeRef(), B_WATCH_NAME | B_WATCH_STAT
		| B_WATCH_ATTR, target);
}


bool 
Model::AttrChanged(const char *attrName)
{
	// called on an attribute changed node monitor
	// sync up cached values of mime type and preferred app and
	// return true if icon needs updating

	ASSERT(IsNodeOpen());
	if (attrName
		&& (strcmp(attrName, kAttrIcon) == 0
			|| strcmp(attrName, kAttrMiniIcon) == 0
			|| strcmp(attrName, kAttrLargeIcon) == 0))
		return true;

	if (!attrName
		|| strcmp(attrName, kAttrMIMEType) == 0
		|| strcmp(attrName, kAttrPreferredApp) == 0) {
		char mimeString[B_MIME_TYPE_LENGTH];
		BNodeInfo info(fNode);
		if (info.GetType(mimeString) != B_OK)
			fMimeType = "";
		else {
			// node has a specific mime type
			fMimeType = mimeString;				
			if (!IsVolume()
				&& !IsSymLink()
				&& info.GetPreferredApp(mimeString) == B_OK)
				SetPreferredAppSignature(mimeString);
		}

#if xDEBUG
		if (fIconFrom != kNode)
			PRINT(("%s, %s:updating icon because file type changed\n",
				Name(), attrName ? attrName : ""));
		else
			PRINT(("not updating icon even thoug type changed "
				"because icon from node\n"));

#endif

		return fIconFrom != kNode;
		// update icon unless it is comming from a node
	}

	return attrName == NULL;
}


bool 
Model::StatChanged()
{
	ASSERT(IsNodeOpen());
	mode_t oldMode = fStatBuf.st_mode;
	fStatus = fNode->GetStat(&fStatBuf);
	if (oldMode != fStatBuf.st_mode) {
		bool forWriting = IsNodeOpenForWriting();
		CloseNode();
		//SetupBaseType();
			// the node type can't change with a stat update...
		OpenNodeCommon(forWriting);
		return true;
	}
	return false;
}

// Mime handling stuff

bool
Model::IsDropTarget(const Model *forDocument, bool traverse) const
{
	switch (CanHandleDrops()) {
		case kCanHandle:
			return true;

		case kCannotHandle:
			return false;

		default:
			break;
	}
	if (!forDocument)
		return true;

	if (traverse) {
		BEntry entry(forDocument->EntryRef(), true);
		if (entry.InitCheck() != B_OK)
			return false;

		BFile file(&entry, O_RDONLY);
		BNodeInfo mime(&file);

		if (mime.InitCheck() != B_OK)
			return false;

		char mimeType[B_MIME_TYPE_LENGTH];
		mime.GetType(mimeType);

		return SupportsMimeType(mimeType, 0) != kDoesNotSupportType;
	}
	// do some mime-based matching
	const char *documentMimeType = forDocument->MimeType();
	if (!documentMimeType)
		return false;

	return SupportsMimeType(documentMimeType, 0) != kDoesNotSupportType;
}


Model::CanHandleResult 
Model::CanHandleDrops() const
{
	if (IsDirectory())
		// directories take anything
		// resolve permissions here 
		return kCanHandle;
		
		
	if (IsSymLink()) {
		// descend into symlink and try again on it's target

		BEntry entry(&fEntryRef, true);
		if (entry.InitCheck() != B_OK)
			return kCannotHandle;
		
		if (entry == BEntry(EntryRef()))
			// self-referencing link, avoid infinite recursion
			return kCannotHandle;

		Model model(&entry);
		if (model.InitCheck() != B_OK)
			return kCannotHandle;

		return model.CanHandleDrops();
	}
	
	if (IsExecutable())
		return kNeedToCheckType;

	return kCannotHandle;
}


inline bool
IsSuperHandlerSignature(const char *signature)
{
	return strcasecmp(signature, B_FILE_MIMETYPE) == 0;
}


enum {
	kDontMatch = 0,
	kMatchSupertype,
	kMatch
};

static int32
MatchMimeTypeString(/*const */BString *documentType, const char *handlerType)
{
	// perform a mime type wildcard match
	// handler types of the form "text"
	// handle every handled type with same supertype,
	// for everything else a full string match is used

	int32 supertypeOnlyLength = 0;
	const char *tmp = strstr(handlerType, "/");
	
	if (!tmp)
		// no subtype - supertype string only
		supertypeOnlyLength = (int32)strlen(handlerType);

	if (supertypeOnlyLength) {
		// compare just the supertype
		tmp = strstr(documentType->String(), "/");
		if (tmp && (tmp - documentType->String() == supertypeOnlyLength)) {
			if (documentType->ICompare(handlerType, supertypeOnlyLength) == 0)
				return kMatchSupertype;
			else
				return kDontMatch;
		}
	}
	
	if (documentType->ICompare(handlerType) == 0)
		return kMatch;

	return kDontMatch;
}


int32 
Model::SupportsMimeType(const char *type, const BObjectList<BString> *list,
	bool exactReason) const
{
	ASSERT((type == 0) != (list == 0));
		// pass in one or the other

	int32 result = kDoesNotSupportType;
		
	BFile file(EntryRef(), O_RDONLY);
	BAppFileInfo handlerInfo(&file);

	BMessage message;
	if (handlerInfo.GetSupportedTypes(&message) != B_OK) 
		return kDoesNotSupportType;

	for (int32 index = 0; ; index++) {

		// check if this model lists the type of dropped document as supported
		const char *mimeSignature;
		int32 bufferLength;

		if (message.FindData("types", 'CSTR', index, (const void **)&mimeSignature,
			&bufferLength)) 
			return result;

		if (IsSuperHandlerSignature(mimeSignature)) {
			if (!exactReason) 
				return kSuperhandlerModel;

			if (result == kDoesNotSupportType) 
				result = kSuperhandlerModel;
		}
		
		int32 match;

		if (type) {
			BString typeString(type);
			match = MatchMimeTypeString(&typeString, mimeSignature);
		} else
			match = WhileEachListItem(const_cast<BObjectList<BString> *>(list),
				MatchMimeTypeString, mimeSignature);
				// const_cast shouldnt be here, have to have it until MW cleans up
		
		if (match == kMatch) 
			// supports the actual type, it can't get any better
			return kModelSupportsType;
		else if (match == kMatchSupertype) {
			if (!exactReason) 
				return kModelSupportsSupertype;

			// we already know this model supports the file as a supertype,
			// now find out if it matches the type
			result = kModelSupportsSupertype;
		}
	}

	return result;
}


bool 
Model::IsDropTargetForList(const BObjectList<BString> *list) const
{
	switch (CanHandleDrops()) {
		case kCanHandle:
			return true;

		case kCannotHandle:
			return false;
		
		default:
			break;
	}
	return SupportsMimeType(0, list) != kDoesNotSupportType;
}


bool 
Model::IsSuperHandler() const
{
	ASSERT(CanHandleDrops() == kNeedToCheckType);

	BFile file(EntryRef(), O_RDONLY);
	BAppFileInfo handlerInfo(&file);

	BMessage message;
	if (handlerInfo.GetSupportedTypes(&message) != B_OK)
		return false;

	for (int32 index = 0; ; index++) {
		const char *mimeSignature;
		int32 bufferLength;

		if (message.FindData("types", 'CSTR', index, (const void **)&mimeSignature,
			&bufferLength))
			return false;

		if (IsSuperHandlerSignature(mimeSignature))
			return true;
	}
	return false;
}


void 
Model::GetEntry(BEntry *entry) const
{
	entry->SetTo(EntryRef());
}


void 
Model::GetPath(BPath *path) const
{
	BEntry entry(EntryRef());
	entry.GetPath(path);
}


bool 
Model::Mimeset(bool force)
{
	BString oldType = MimeType();
	ModelNodeLazyOpener opener(this);
	BPath path;
	GetPath(&path);
	if (force) {
		if (opener.OpenNode(true) != B_OK)
			return false;

		Node()->RemoveAttr(kAttrMIMEType);
		update_mime_info(path.Path(), 0, 1, 1);
	} else
		update_mime_info(path.Path(), 0, 1, 0);

	AttrChanged(0);

	return !oldType.ICompare(MimeType());
}


ssize_t 
Model::WriteAttr(const char *attr, type_code type, off_t offset,
	const void *buffer, size_t length)
{
	BModelWriteOpener opener(this);
	if (!fNode) 
		return 0;

	ssize_t result = fNode->WriteAttr(attr, type, offset, buffer, length);
	return result;
}


ssize_t 
Model::WriteAttrKillForeign(const char *attr, const char *foreignAttr,
	type_code type, off_t offset, const void *buffer, size_t length)
{
	BModelWriteOpener opener(this);
	if (!fNode) 
		return 0;
	
	ssize_t result = fNode->WriteAttr(attr, type, offset, buffer, length);
	if (result == (ssize_t)length)
		// nuke attribute in opposite endianness
		fNode->RemoveAttr(foreignAttr);
	return result;
}


status_t 
Model::GetLongVersionString(BString &result, version_kind kind)
{
	BFile file(EntryRef(), O_RDONLY);
	status_t error = file.InitCheck();
	if (error != B_OK)
		return error;

	BAppFileInfo info(&file);
	error = info.InitCheck();
	if (error != B_OK)
		return error;

	version_info version;
	error = info.GetVersionInfo(&version, kind);
	if (error != B_OK)
		return error;

	result = version.long_info;
	return B_OK;
}

status_t 
Model::GetVersionString(BString &result, version_kind kind)
{
	BFile file(EntryRef(), O_RDONLY);
	status_t error = file.InitCheck();
	if (error != B_OK)
		return error;

	BAppFileInfo info(&file);
	error = info.InitCheck();
	if (error != B_OK)
		return error;

	version_info version;
	error = info.GetVersionInfo(&version, kind);
	if (error != B_OK)
		return error;

	char vstr[32];
	sprintf(vstr, "%ld.%ld.%ld", version.major, version.middle, version.minor);
	result = vstr;
	return B_OK;
}

#if DEBUG

void
Model::PrintToStream(int32 level, bool deep)
{
	PRINT(("model name %s, entry name %s, inode %Lx, dev %x, directory inode %Lx\n",
		Name() ? Name() : "**empty name**",
		EntryRef()->name ? EntryRef()->name : "**empty ref name**",
		NodeRef()->node,
		NodeRef()->device,
		EntryRef()->directory));
	PRINT(("type %s \n", MimeType()));

	PRINT(("model type: "));
	switch (fBaseType) {
		case kPlainNode:
			PRINT(("plain\n"));
			break;

		case kQueryNode:
			PRINT(("query\n"));
			break;

		case kQueryTemplateNode:
			PRINT(("query template\n"));
			break;

		case kExecutableNode:
			PRINT(("exe\n"));
			break;

		case kDirectoryNode:
		case kTrashNode:
			PRINT(("dir\n"));
			break;

		case kLinkNode:
			PRINT(("link\n"));
			break;

		case kRootNode:
			PRINT(("root\n"));
			break;

		case kVolumeNode:
			PRINT(("volume, name %s\n", fVolumeName ? fVolumeName : ""));
			break;

		default:
			PRINT(("unknown\n"));
			break;
	}

	if (level < 1)
		return;

	if (!IsVolume())
		PRINT(("preferred app %s\n", fPreferredAppName ? fPreferredAppName : ""));

	PRINT(("icon from: "));
	switch (IconFrom()) {
		case kUnknownSource:
			PRINT(("unknown\n"));
			break;
		case kUnknownNotFromNode:
			PRINT(("unknown but not from a node\n"));
			break;
		case kTrackerDefault:
			PRINT(("tracker default\n"));
			break;
		case kTrackerSupplied:
			PRINT(("tracker supplied\n"));
			break;
		case kMetaMime:
			PRINT(("metamime\n"));
			break;
		case kPreferredAppForType:
			PRINT(("preferred app for type\n"));
			break;
		case kPreferredAppForNode:
			PRINT(("preferred app for node\n"));
			break;
		case kNode:
			PRINT(("node\n"));
			break;
		case kVolume:
			PRINT(("volume\n"));
			break;
	}

	PRINT(("model %s opened %s \n", !IsNodeOpen() ? "not " : "",
		IsNodeOpenForWriting() ? "for writing" : ""));

	if (IsNodeOpen()) {
		node_ref nodeRef;
		fNode->GetNodeRef(&nodeRef);
		PRINT(("node ref of open Node %Lx %x\n", nodeRef.node, nodeRef.device));
	}

	if (deep && IsSymLink()) {
		BEntry tmpEntry(EntryRef(), true);
		Model tmp(&tmpEntry);
		PRINT(("symlink to:\n"));
		tmp.PrintToStream();
	}
	TrackIconSource(B_MINI_ICON);
	TrackIconSource(B_LARGE_ICON);
}


void
Model::TrackIconSource(icon_size size)
{
	PRINT(("tracking %s icon\n", size == B_LARGE_ICON ? "large" : "small"));
	BRect rect;
	if (size == B_MINI_ICON)
		rect.Set(0, 0, B_MINI_ICON - 1, B_MINI_ICON - 1);
	else
		rect.Set(0, 0, B_LARGE_ICON - 1, B_LARGE_ICON - 1);

	BBitmap bitmap(rect, B_CMAP8);

	BModelOpener opener(this);

	if (Node() == NULL) {
		PRINT(("track icon error - no node\n"));
		return;
	}

	if (IsSymLink()) {
		PRINT(("tracking symlink icon\n"));
		if (fLinkTo) {
			fLinkTo->TrackIconSource(size);
			return;
		}
	}

	if (fBaseType == kVolumeNode) {
		BVolume volume(NodeRef()->device);
		status_t result = volume.GetIcon(&bitmap, size);
		PRINT(("getting icon from volume %s\n", strerror(result)));
	} else {
		BNodeInfo nodeInfo(Node());

		status_t err = nodeInfo.GetIcon(&bitmap, size);
		if (err == B_OK) {
			// file knew which icon to use, we are done
			PRINT(("track icon - got icon from file\n"));
			return;
		}

		char preferredApp[B_MIME_TYPE_LENGTH];
		err = nodeInfo.GetPreferredApp(preferredApp);
		if (err == B_OK && preferredApp[0]) {
			BMimeType preferredAppType(preferredApp);
			err = preferredAppType.GetIconForType(MimeType(), &bitmap, size);
			if (err == B_OK) {
				PRINT(("track icon - got icon for type %s from preferred app %s for file\n",
					MimeType(), preferredApp));
				return;
			}
		}

		BMimeType mimeType(MimeType());
		err = mimeType.GetIcon(&bitmap, size);
		if (err == B_OK) {
			// the system knew what icon to use for the type, we are done
			PRINT(("track icon - signature %s, got icon from system\n",
				MimeType()));
			return;
		}

		err = mimeType.GetPreferredApp(preferredApp);
		if (err != B_OK) {
			// no preferred App for document, give up
			PRINT(("track icon - signature %s, no prefered app, error %s\n",
				MimeType(), strerror(err)));
			return;
		}

		BMimeType preferredAppType(preferredApp);
		err = preferredAppType.GetIconForType(MimeType(), &bitmap, size);
		if (err == B_OK) {
			// the preferred app knew icon to use for the type, we are done
			PRINT(("track icon - signature %s, got icon from preferred app %s\n",
				MimeType(), preferredApp));
			return;
		}
		PRINT(("track icon - signature %s, preferred app %s, no icon, error %s\n",
			MimeType(), preferredApp, strerror(err)));
	}
}

#endif	// DEBUG

#ifdef CHECK_OPEN_MODEL_LEAKS

namespace BPrivate {
#include <stdio.h>

void
DumpOpenModels(bool extensive)
{
	if (readOnlyOpenModelList) {
		int32 count = readOnlyOpenModelList->CountItems();
		printf("%ld models open read-only:\n", count);
		printf("==========================\n");
		for (int32 index = 0; index < count; index++) {
			if (extensive) {
				printf("---------------------------\n");
				readOnlyOpenModelList->ItemAt(index)->PrintToStream();
			} else
				printf("%s\n", readOnlyOpenModelList->ItemAt(index)->Name());
		}
	}
	if (writableOpenModelList) {
		int32 count = writableOpenModelList->CountItems();
		printf("%ld models open writable:\n", count);
		printf("models open writable:\n");
		printf("======================\n");
		for (int32 index = 0; index < count; index++) {
			if (extensive) {
				printf("---------------------------\n");
				writableOpenModelList->ItemAt(index)->PrintToStream();
			} else
				printf("%s\n", writableOpenModelList->ItemAt(index)->Name());
		}
	}
}


void
InitOpenModelDumping()
{
	readOnlyOpenModelList = 0;
	writableOpenModelList = 0;
}

}	// namespace BPrivate

#endif	// CHECK_OPEN_MODEL_LEAKS