Add Index base class and index table in Volume

src/add-ons/kernel/file_systems/packagefs/Index.cpp

@@ -0,0 +1,205 @@
+/*
+ * Copyright 2011, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include "Index.h"
+
+#include "DebugSupport.h"
+#include "Node.h"
+#include "IndexImpl.h"
+
+
+// #pragma mark - Index
+
+
+Index::Index()
+	:
+	fVolume(NULL),
+	fName(NULL),
+	fType(0),
+	fKeyLength(0),
+	fFixedKeyLength(true)
+{
+}
+
+
+Index::~Index()
+{
+	free(fName);
+}
+
+
+status_t
+Index::Init(Volume* volume, const char* name, uint32 type, bool fixedKeyLength,
+	size_t keyLength)
+{
+	fName = strdup(name);
+	if (fName == NULL)
+		return B_NO_MEMORY;
+
+	fVolume = volume;
+	fType = type;
+	fKeyLength = keyLength;
+	fFixedKeyLength = fixedKeyLength;
+
+	return B_OK;
+}
+
+
+bool
+Index::GetIterator(IndexIterator* iterator)
+{
+	bool result = false;
+	if (iterator) {
+		AbstractIndexIterator* actualIterator = InternalGetIterator();
+		if (actualIterator) {
+			iterator->SetIterator(actualIterator);
+			result = true;
+		}
+	}
+	return result;
+}
+
+
+bool
+Index::Find(const void* key, size_t length, IndexIterator* iterator)
+{
+	bool result = false;
+	if (key && iterator) {
+		AbstractIndexIterator* actualIterator = InternalFind(key, length);
+		if (actualIterator) {
+			iterator->SetIterator(actualIterator);
+			result = true;
+		}
+	}
+	return result;
+}
+
+
+void
+Index::Dump()
+{
+	D(
+		PRINT(("Index: `%s', type: %lx\n", Name(), Type()));
+		for (IndexIterator it(this); it.Current(); it.Next()) {
+			Node* node = it.Current();
+			PRINT(("  node: `%s', dir: %lld\n", node->GetName(),
+				node->Parent()->ID()));
+		}
+	)
+}
+
+
+// #pragma mark - IndexIterator
+
+
+IndexIterator::IndexIterator()
+	:
+	fIterator(NULL)
+{
+}
+
+
+IndexIterator::IndexIterator(Index* index)
+	:
+	fIterator(NULL)
+{
+	if (index)
+		index->GetIterator(this);
+}
+
+
+IndexIterator::~IndexIterator()
+{
+	SetIterator(NULL);
+}
+
+
+Node*
+IndexIterator::Current()
+{
+	return fIterator != NULL ? fIterator->Current() : NULL;
+}
+
+
+Node*
+IndexIterator::Current(void* buffer, size_t* _keyLength)
+{
+	return fIterator != NULL ? fIterator->Current(buffer, _keyLength) : NULL;
+}
+
+
+Node*
+IndexIterator::Previous()
+{
+	return fIterator != NULL ? fIterator->Previous() : NULL;
+}
+
+
+Node*
+IndexIterator::Next()
+{
+	return fIterator != NULL ? fIterator->Next() : NULL;
+}
+
+
+Node*
+IndexIterator::Next(void* buffer, size_t* _keyLength)
+{
+	Node* node = NULL;
+	if (fIterator != NULL && fIterator->Next())
+		node = Current(buffer, _keyLength);
+	return node;
+}
+
+
+status_t
+IndexIterator::Suspend()
+{
+	return fIterator != NULL ? fIterator->Suspend() : B_BAD_VALUE;
+}
+
+
+status_t
+IndexIterator::Resume()
+{
+	return fIterator != NULL ? fIterator->Resume() : B_BAD_VALUE;
+}
+
+
+void
+IndexIterator::SetIterator(AbstractIndexIterator* iterator)
+{
+	delete fIterator;
+	fIterator = iterator;
+}
+
+
+// #pragma mark - AbstractIndexIterator
+
+
+AbstractIndexIterator::AbstractIndexIterator()
+{
+}
+
+
+AbstractIndexIterator::~AbstractIndexIterator()
+{
+}
+
+
+status_t
+AbstractIndexIterator::Suspend()
+{
+	return B_OK;
+}
+
+
+status_t
+AbstractIndexIterator::Resume()
+{
+	return B_OK;
+}
+

src/add-ons/kernel/file_systems/packagefs/Index.h

@@ -0,0 +1,128 @@
+/*
+ * Copyright 2011, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef INDEX_H
+#define INDEX_H
+
+
+#include <string.h>
+
+#include <SupportDefs.h>
+
+#include <util/khash.h>
+#include <util/OpenHashTable.h>
+
+
+class AbstractIndexIterator;
+class IndexIterator;
+class Node;
+class Volume;
+
+
+static const size_t kMaxIndexKeyLength = 256;
+
+
+class Index {
+public:
+								Index();
+	virtual						~Index();
+
+			status_t			Init(Volume* volume, const char* name,
+									uint32 type, bool fixedKeyLength,
+									size_t keyLength = 0);
+
+			Volume*				GetVolume() const		{ return fVolume; }
+
+			const char*			Name() const			{ return fName; }
+			uint32				Type() const			{ return fType; }
+			bool				HasFixedKeyLength() const
+									{ return fFixedKeyLength; }
+			size_t				KeyLength() const		{ return fKeyLength; }
+
+	virtual	int32				CountEntries() const = 0;
+
+			bool				GetIterator(IndexIterator* iterator);
+			bool				Find(const void* key, size_t length,
+									IndexIterator* iterator);
+
+			Index*&				IndexHashLink()
+									{ return fHashLink; }
+
+			// debugging
+			void				Dump();
+
+protected:
+	virtual	AbstractIndexIterator* InternalGetIterator() = 0;
+	virtual	AbstractIndexIterator* InternalFind(const void* key,
+									size_t length) = 0;
+
+protected:
+			Index*				fHashLink;
+			Volume*				fVolume;
+			char*				fName;
+			uint32				fType;
+			size_t				fKeyLength;
+			bool				fFixedKeyLength;
+};
+
+
+class IndexIterator {
+public:
+								IndexIterator();
+								IndexIterator(Index* index);
+								~IndexIterator();
+
+			Node*				Current();
+			Node*				Current(void* buffer, size_t* _keyLength);
+			Node*				Previous();
+			Node*				Next();
+			Node*				Next(void* buffer, size_t* _keyLength);
+
+			status_t			Suspend();
+			status_t			Resume();
+
+private:
+			void				SetIterator(AbstractIndexIterator* iterator);
+
+private:
+			friend class Index;
+
+private:
+			AbstractIndexIterator* fIterator;
+};
+
+
+// #pragma mark - IndexHashDefinition
+
+
+struct IndexHashDefinition {
+	typedef const char*	KeyType;
+	typedef	Index		ValueType;
+
+	size_t HashKey(const char* key) const
+	{
+		return key != NULL ? hash_hash_string(key) : 0;
+	}
+
+	size_t Hash(const Index* value) const
+	{
+		return HashKey(value->Name());
+	}
+
+	bool Compare(const char* key, const Index* value) const
+	{
+		return strcmp(value->Name(), key) == 0;
+	}
+
+	Index*& GetLink(Index* value) const
+	{
+		return value->IndexHashLink();
+	}
+};
+
+
+typedef BOpenHashTable<IndexHashDefinition> IndexHashTable;
+
+
+#endif	// INDEX_H

src/add-ons/kernel/file_systems/packagefs/IndexImpl.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2011, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef INDEX_IMPL_H
+#define INDEX_IMPL_H
+
+
+#include "Index.h"
+#include "Node.h"
+
+
+class AbstractIndexIterator {
+public:
+								AbstractIndexIterator();
+	virtual						~AbstractIndexIterator();
+
+	virtual Node*				Current() = 0;
+	virtual Node*				Current(void* buffer, size_t* _keyLength) = 0;
+	virtual Node*				Previous() = 0;
+	virtual Node*				Next() = 0;
+
+	virtual	status_t			Suspend();
+	virtual	status_t			Resume();
+};
+
+
+#endif	// INDEX_IMPL_H

src/add-ons/kernel/file_systems/packagefs/Jamfile

@@ -16,6 +16,7 @@ HAIKU_PACKAGE_FS_SOURCES =
 	Directory.cpp
 	EmptyAttributeDirectoryCookie.cpp
 	GlobalFactory.cpp
+	Index.cpp
 	kernel_interface.cpp
 	Node.cpp
 	NodeListener.cpp

src/add-ons/kernel/file_systems/packagefs/Volume.cpp

@@ -460,6 +460,14 @@ Volume::~Volume()
 	while (PackageDomain* packageDomain = fPackageDomains.Head())
 		_RemovePackageDomain(packageDomain);
 
+	// delete all indices
+	Index* index = fIndices.Clear(true);
+	while (index != NULL) {
+		Index* next = index->IndexHashLink();
+		delete index;
+		index = next;
+	}
+
 	// remove all nodes from the ID hash table
 	Node* node = fNodes.Clear(true);
 	while (node != NULL) {
@@ -495,6 +503,10 @@ Volume::Mount(const char* parameterString)
 	if (error != B_OK)
 		RETURN_ERROR(error);
 
+	error = fIndices.Init();
+	if (error != B_OK)
+		RETURN_ERROR(error);
+
 	// get the mount parameters
 	const char* packages = NULL;
 	const char* volumeName = NULL;

src/add-ons/kernel/file_systems/packagefs/Volume.h

@@ -14,6 +14,7 @@
 #include <util/DoublyLinkedList.h>
 #include <util/KMessage.h>
 
+#include "Index.h"
 #include "Node.h"
 #include "NodeListener.h"
 #include "PackageDomain.h"
@@ -71,6 +72,9 @@ public:
 									Node* node);
 			void				RemoveNodeListener(NodeListener* listener);
 
+			Index*				FindIndex(const char* name) const
+									{ return fIndices.Lookup(name); }
+
 			// VFS wrappers
 			status_t			GetVNode(ino_t nodeID, Node*& _node);
 			status_t			PutVNode(ino_t nodeID);
@@ -188,6 +192,7 @@ private:
 
 			NodeIDHashTable		fNodes;
 			NodeListenerHashTable fNodeListeners;
+			IndexHashTable		fIndices;
 
 			JobList				fJobQueue;
 			mutex				fJobQueueLock;