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-rwxr-xr-xindra/llcommon/lluuidhashmap.h583
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diff --git a/indra/llcommon/lluuidhashmap.h b/indra/llcommon/lluuidhashmap.h
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--- a/indra/llcommon/lluuidhashmap.h
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-/**
- * @file lluuidhashmap.h
- * @brief A uuid based hash map.
- *
- * $LicenseInfo:firstyear=2003&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2010, Linden Research, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
- * $/LicenseInfo$
- */
-
-#ifndef LL_LLUUIDHASHMAP_H
-#define LL_LLUUIDHASHMAP_H
-
-#include "stdtypes.h"
-#include "llerror.h"
-#include "lluuid.h"
-
-// UUID hash map
-
- /*
- LLUUIDHashMap<uuid_pair, 32> foo(test_equals);
- LLUUIDHashMapIter<uuid_pair, 32> bar(&foo);
-
- LLDynamicArray<LLUUID> source_ids;
- const S32 COUNT = 100000;
- S32 q;
- for (q = 0; q < COUNT; q++)
- {
- llinfos << "Creating" << llendl;
- LLUUID id;
- id.generate();
- //llinfos << q << ":" << id << llendl;
- uuid_pair pair;
- pair.mUUID = id;
- pair.mValue = q;
- foo.set(id, pair);
- source_ids.put(id);
- //ms_sleep(1);
- }
-
- uuid_pair cur;
- llinfos << "Iterating" << llendl;
- for (cur = bar.first(); !bar.done(); cur = bar.next())
- {
- if (source_ids[cur.mValue] != cur.mUUID)
- {
- llerrs << "Incorrect value iterated!" << llendl;
- }
- //llinfos << cur.mValue << ":" << cur.mUUID << llendl;
- //ms_sleep(1);
- }
-
- llinfos << "Finding" << llendl;
- for (q = 0; q < COUNT; q++)
- {
- cur = foo.get(source_ids[q]);
- if (source_ids[cur.mValue] != cur.mUUID)
- {
- llerrs << "Incorrect value found!" << llendl;
- }
- //llinfos << res.mValue << ":" << res.mUUID << llendl;
- //ms_sleep(1);
- }
-
- llinfos << "Removing" << llendl;
- for (q = 0; q < COUNT/2; q++)
- {
- if (!foo.remove(source_ids[q]))
- {
- llerrs << "Remove failed!" << llendl;
- }
- //ms_sleep(1);
- }
-
- llinfos << "Iterating" << llendl;
- for (cur = bar.first(); !bar.done(); cur = bar.next())
- {
- if (source_ids[cur.mValue] != cur.mUUID)
- {
- llerrs << "Incorrect value found!" << llendl;
- }
- //llinfos << cur.mValue << ":" << cur.mUUID << llendl;
- //ms_sleep(1);
- }
- llinfos << "Done with UUID map test" << llendl;
-
- return 0;
- */
-
-
-//
-// LLUUIDHashNode
-//
-
-template <class DATA, int SIZE>
-class LLUUIDHashNode
-{
-public:
- LLUUIDHashNode();
-
-public:
- S32 mCount;
- U8 mKey[SIZE];
- DATA mData[SIZE];
- LLUUIDHashNode<DATA, SIZE> *mNextNodep;
-};
-
-
-//
-// LLUUIDHashNode implementation
-//
-template <class DATA, int SIZE>
-LLUUIDHashNode<DATA, SIZE>::LLUUIDHashNode()
-{
- mCount = 0;
- mNextNodep = NULL;
-}
-
-
-template <class DATA_TYPE, int SIZE>
-class LLUUIDHashMap
-{
-public:
- // basic constructor including sorter
- LLUUIDHashMap(BOOL (*equals)(const LLUUID &uuid, const DATA_TYPE &data),
- const DATA_TYPE &null_data);
- ~LLUUIDHashMap();
-
- inline DATA_TYPE &get(const LLUUID &uuid);
- inline BOOL check(const LLUUID &uuid) const;
- inline DATA_TYPE &set(const LLUUID &uuid, const DATA_TYPE &type);
- inline BOOL remove(const LLUUID &uuid);
- void removeAll();
-
- inline S32 getLength() const; // Warning, NOT O(1!)
-public:
- BOOL (*mEquals)(const LLUUID &uuid, const DATA_TYPE &data);
- LLUUIDHashNode<DATA_TYPE, SIZE> mNodes[256];
-
- S32 mIterCount;
-protected:
- DATA_TYPE mNull;
-};
-
-
-//
-// LLUUIDHashMap implementation
-//
-
-template <class DATA_TYPE, int SIZE>
-LLUUIDHashMap<DATA_TYPE, SIZE>::LLUUIDHashMap(BOOL (*equals)(const LLUUID &uuid, const DATA_TYPE &data),
- const DATA_TYPE &null_data)
-: mEquals(equals),
- mIterCount(0),
- mNull(null_data)
-{ }
-
-template <class DATA_TYPE, int SIZE>
-LLUUIDHashMap<DATA_TYPE, SIZE>::~LLUUIDHashMap()
-{
- removeAll();
-}
-
-template <class DATA_TYPE, int SIZE>
-void LLUUIDHashMap<DATA_TYPE, SIZE>::removeAll()
-{
- S32 bin;
- for (bin = 0; bin < 256; bin++)
- {
- LLUUIDHashNode<DATA_TYPE, SIZE>* nodep = &mNodes[bin];
-
- BOOL first = TRUE;
- while (nodep)
- {
- S32 i;
- const S32 count = nodep->mCount;
-
- // Iterate through all members of this node
- for (i = 0; i < count; i++)
- {
- nodep->mData[i] = mNull;
- }
-
- nodep->mCount = 0;
- // Done with all objects in this node, go to the next.
-
- LLUUIDHashNode<DATA_TYPE, SIZE>* curp = nodep;
- nodep = nodep->mNextNodep;
-
- // Delete the node if it's not the first node
- if (first)
- {
- first = FALSE;
- curp->mNextNodep = NULL;
- }
- else
- {
- delete curp;
- }
- }
- }
-}
-
-template <class DATA_TYPE, int SIZE>
-inline S32 LLUUIDHashMap<DATA_TYPE, SIZE>::getLength() const
-{
- S32 count = 0;
- S32 bin;
- for (bin = 0; bin < 256; bin++)
- {
- LLUUIDHashNode<DATA_TYPE, SIZE>* nodep = (LLUUIDHashNode<DATA_TYPE, SIZE>*) &mNodes[bin];
- while (nodep)
- {
- count += nodep->mCount;
- nodep = nodep->mNextNodep;
- }
- }
- return count;
-}
-
-template <class DATA_TYPE, int SIZE>
-inline DATA_TYPE &LLUUIDHashMap<DATA_TYPE, SIZE>::get(const LLUUID &uuid)
-{
- LLUUIDHashNode<DATA_TYPE, SIZE>* nodep = &mNodes[uuid.mData[0]];
-
- // Grab the second byte of the UUID, which is the key for the node data
- const S32 second_byte = uuid.mData[1];
- while (nodep)
- {
- S32 i;
- const S32 count = nodep->mCount;
-
- // Iterate through all members of this node
- for (i = 0; i < count; i++)
- {
- if ((nodep->mKey[i] == second_byte) && mEquals(uuid, nodep->mData[i]))
- {
- // The second byte matched, and our equality test passed.
- // We found it.
- return nodep->mData[i];
- }
- }
-
- // Done with all objects in this node, go to the next.
- nodep = nodep->mNextNodep;
- }
- return mNull;
-}
-
-
-template <class DATA_TYPE, int SIZE>
-inline BOOL LLUUIDHashMap<DATA_TYPE, SIZE>::check(const LLUUID &uuid) const
-{
- const LLUUIDHashNode<DATA_TYPE, SIZE>* nodep = &mNodes[uuid.mData[0]];
-
- // Grab the second byte of the UUID, which is the key for the node data
- const S32 second_byte = uuid.mData[1];
- while (nodep)
- {
- S32 i;
- const S32 count = nodep->mCount;
-
- // Iterate through all members of this node
- for (i = 0; i < count; i++)
- {
- if ((nodep->mKey[i] == second_byte) && mEquals(uuid, nodep->mData[i]))
- {
- // The second byte matched, and our equality test passed.
- // We found it.
- return TRUE;
- }
- }
-
- // Done with all objects in this node, go to the next.
- nodep = nodep->mNextNodep;
- }
-
- // Didn't find anything
- return FALSE;
-}
-
-
-template <class DATA_TYPE, int SIZE>
-inline DATA_TYPE &LLUUIDHashMap<DATA_TYPE, SIZE>::set(const LLUUID &uuid, const DATA_TYPE &data)
-{
- // Set is just like a normal find, except that if we find a match
- // we replace it with the input value.
- // If we don't find a match, we append to the end of the list.
-
- LLUUIDHashNode<DATA_TYPE, SIZE>* nodep = &mNodes[uuid.mData[0]];
-
- const S32 second_byte = uuid.mData[1];
- while (1)
- {
- const S32 count = nodep->mCount;
-
- S32 i;
- for (i = 0; i < count; i++)
- {
- if ((nodep->mKey[i] == second_byte) && mEquals(uuid, nodep->mData[i]))
- {
- // We found a match for this key, replace the data with
- // the incoming data.
- nodep->mData[i] = data;
- return nodep->mData[i];
- }
- }
- if (!nodep->mNextNodep)
- {
- // We've iterated through all of the keys without finding a match
- if (i < SIZE)
- {
- // There's still some space on this node, append
- // the key and data to it.
- nodep->mKey[i] = second_byte;
- nodep->mData[i] = data;
- nodep->mCount++;
-
- return nodep->mData[i];
- }
- else
- {
- // This node is full, append a new node to the end.
- nodep->mNextNodep = new LLUUIDHashNode<DATA_TYPE, SIZE>;
- nodep->mNextNodep->mKey[0] = second_byte;
- nodep->mNextNodep->mData[0] = data;
- nodep->mNextNodep->mCount = 1;
-
- return nodep->mNextNodep->mData[0];
- }
- }
-
- // No match on this node, go to the next
- nodep = nodep->mNextNodep;
- }
-}
-
-
-template <class DATA_TYPE, int SIZE>
-inline BOOL LLUUIDHashMap<DATA_TYPE, SIZE>::remove(const LLUUID &uuid)
-{
- if (mIterCount)
- {
- // We don't allow remove when we're iterating, it's bad karma!
- llerrs << "Attempted remove while an outstanding iterator in LLUUIDHashMap!" << llendl;
- }
- // Remove is the trickiest operation.
- // What we want to do is swap the last element of the last
- // node if we find the one that we want to remove, but we have
- // to deal with deleting the node from the tail if it's empty, but
- // NOT if it's the only node left.
-
- LLUUIDHashNode<DATA_TYPE, SIZE> *nodep = &mNodes[uuid.mData[0]];
-
- // Not empty, we need to search through the nodes
- const S32 second_byte = uuid.mData[1];
-
- // A modification of the standard search algorithm.
- while (nodep)
- {
- const S32 count = nodep->mCount;
-
- S32 i;
- for (i = 0; i < count; i++)
- {
- if ((nodep->mKey[i] == second_byte) && mEquals(uuid, nodep->mData[i]))
- {
- // We found the node that we want to remove.
- // Find the last (and next-to-last) node, and the index of the last
- // element. We could conceviably start from the node we're on,
- // but that makes it more complicated, this is easier.
-
- LLUUIDHashNode<DATA_TYPE, SIZE> *prevp = &mNodes[uuid.mData[0]];
- LLUUIDHashNode<DATA_TYPE, SIZE> *lastp = prevp;
-
- // Find the last and next-to-last
- while (lastp->mNextNodep)
- {
- prevp = lastp;
- lastp = lastp->mNextNodep;
- }
-
- // First, swap in the last to the current location.
- nodep->mKey[i] = lastp->mKey[lastp->mCount - 1];
- nodep->mData[i] = lastp->mData[lastp->mCount - 1];
-
- // Now, we delete the entry
- lastp->mCount--;
- lastp->mData[lastp->mCount] = mNull;
-
- if (!lastp->mCount)
- {
- // We deleted the last element!
- if (lastp != &mNodes[uuid.mData[0]])
- {
- // Only blitz the node if it's not the head
- // Set the previous node to point to NULL, then
- // blitz the empty last node
- prevp->mNextNodep = NULL;
- delete lastp;
- }
- }
- return TRUE;
- }
- }
-
- // Iterate to the next node, we've scanned all the entries in this one.
- nodep = nodep->mNextNodep;
- }
- return FALSE;
-}
-
-
-//
-// LLUUIDHashMapIter
-//
-
-template <class DATA_TYPE, int SIZE>
-class LLUUIDHashMapIter
-{
-public:
- LLUUIDHashMapIter(LLUUIDHashMap<DATA_TYPE, SIZE> *hash_mapp);
- ~LLUUIDHashMapIter();
-
-
- inline void reset();
- inline void first();
- inline void next();
- inline BOOL done() const;
-
- DATA_TYPE& operator*() const
- {
- return mCurHashNodep->mData[mCurHashNodeKey];
- }
- DATA_TYPE* operator->() const
- {
- return &(operator*());
- }
-
-protected:
- LLUUIDHashMap<DATA_TYPE, SIZE> *mHashMapp;
- LLUUIDHashNode<DATA_TYPE, SIZE> *mCurHashNodep;
-
- S32 mCurHashMapNodeNum;
- S32 mCurHashNodeKey;
-
- DATA_TYPE mNull;
-};
-
-
-//
-// LLUUIDHashMapIter Implementation
-//
-template <class DATA_TYPE, int SIZE>
-LLUUIDHashMapIter<DATA_TYPE, SIZE>::LLUUIDHashMapIter(LLUUIDHashMap<DATA_TYPE, SIZE> *hash_mapp)
-{
- mHashMapp = hash_mapp;
- mCurHashNodep = NULL;
- mCurHashMapNodeNum = 0;
- mCurHashNodeKey = 0;
-}
-
-template <class DATA_TYPE, int SIZE>
-LLUUIDHashMapIter<DATA_TYPE, SIZE>::~LLUUIDHashMapIter()
-{
- reset();
-}
-
-template <class DATA_TYPE, int SIZE>
-inline void LLUUIDHashMapIter<DATA_TYPE, SIZE>::reset()
-{
- if (mCurHashNodep)
- {
- // We're partway through an iteration, we can clean up now
- mHashMapp->mIterCount--;
- mCurHashNodep = NULL;
- }
-}
-
-template <class DATA_TYPE, int SIZE>
-inline void LLUUIDHashMapIter<DATA_TYPE, SIZE>::first()
-{
- // Iterate through until we find the first non-empty node;
- S32 i;
- for (i = 0; i < 256; i++)
- {
- if (mHashMapp->mNodes[i].mCount)
- {
- if (!mCurHashNodep)
- {
- // Increment, since it's no longer safe for us to do a remove
- mHashMapp->mIterCount++;
- }
-
- mCurHashNodep = &mHashMapp->mNodes[i];
- mCurHashMapNodeNum = i;
- mCurHashNodeKey = 0;
- //return mCurHashNodep->mData[0];
- return;
- }
- }
-
- // Completely empty!
- mCurHashNodep = NULL;
- //return mNull;
- return;
-}
-
-template <class DATA_TYPE, int SIZE>
-inline BOOL LLUUIDHashMapIter<DATA_TYPE, SIZE>::done() const
-{
- return mCurHashNodep ? FALSE : TRUE;
-}
-
-template <class DATA_TYPE, int SIZE>
-inline void LLUUIDHashMapIter<DATA_TYPE, SIZE>::next()
-{
- // No current entry, this iterator is done
- if (!mCurHashNodep)
- {
- //return mNull;
- return;
- }
-
- // Go to the next element
- mCurHashNodeKey++;
- if (mCurHashNodeKey < mCurHashNodep->mCount)
- {
- // We're not done with this node, return the current element
- //return mCurHashNodep->mData[mCurHashNodeKey];
- return;
- }
-
- // Done with this node, move to the next
- mCurHashNodep = mCurHashNodep->mNextNodep;
- if (mCurHashNodep)
- {
- // Return the first element
- mCurHashNodeKey = 0;
- //return mCurHashNodep->mData[0];
- return;
- }
-
- // Find the next non-empty node (keyed on the first byte)
- mCurHashMapNodeNum++;
-
- S32 i;
- for (i = mCurHashMapNodeNum; i < 256; i++)
- {
- if (mHashMapp->mNodes[i].mCount)
- {
- // We found one that wasn't empty
- mCurHashNodep = &mHashMapp->mNodes[i];
- mCurHashMapNodeNum = i;
- mCurHashNodeKey = 0;
- //return mCurHashNodep->mData[0];
- return;
- }
- }
-
- // OK, we're done, nothing else to iterate
- mCurHashNodep = NULL;
- mHashMapp->mIterCount--; // Decrement since we're safe to do removes now
- //return mNull;
-}
-
-#endif // LL_LLUUIDHASHMAP_H
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