630 lines
14 KiB
C++
630 lines
14 KiB
C++
/*************************************************************************/
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/* hash_map.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef HASH_MAP_H
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#define HASH_MAP_H
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#include "hashfuncs.h"
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#include "error_macros.h"
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#include "ustring.h"
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#include "os/memory.h"
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#include "list.h"
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class HashMapHahserDefault {
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public:
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static _FORCE_INLINE_ uint32_t hash(const String &p_string) { return p_string.hash(); }
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static _FORCE_INLINE_ uint32_t hash(const char *p_cstr) { return hash_djb2(p_cstr); }
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static _FORCE_INLINE_ uint32_t hash(const uint64_t p_int) {
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uint64_t v=p_int;
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v = (~v) + (v << 18); // v = (v << 18) - v - 1;
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v = v ^ (v >> 31);
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v = v * 21; // v = (v + (v << 2)) + (v << 4);
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v = v ^ (v >> 11);
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v = v + (v << 6);
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v = v ^ (v >> 22);
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return (int) v;
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}
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static _FORCE_INLINE_ uint32_t hash(const int64_t p_int) { return hash(uint64_t(p_int)); }
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static _FORCE_INLINE_ uint32_t hash(const uint32_t p_int) { return p_int; }
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static _FORCE_INLINE_ uint32_t hash(const int32_t p_int) { return (uint32_t)p_int; }
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static _FORCE_INLINE_ uint32_t hash(const uint16_t p_int) { return p_int; }
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static _FORCE_INLINE_ uint32_t hash(const int16_t p_int) { return (uint32_t)p_int; }
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static _FORCE_INLINE_ uint32_t hash(const uint8_t p_int) { return p_int; }
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static _FORCE_INLINE_ uint32_t hash(const int8_t p_int) { return (uint32_t)p_int; }
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static _FORCE_INLINE_ uint32_t hash(const wchar_t p_wchar) { return (uint32_t)p_wchar; }
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// static _FORCE_INLINE_ uint32_t hash(const void* p_ptr) { return uint32_t(uint64_t(p_ptr))*(0x9e3779b1L); }
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};
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/**
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* @class HashMap
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* @author Juan Linietsky <reduzio@gmail.com>
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*
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* Implementation of a standard Hashing HashMap, for quick lookups of Data associated with a Key.
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* The implementation provides hashers for the default types, if you need a special kind of hasher, provide
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* your own.
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* @param TKey Key, search is based on it, needs to be hasheable. It is unique in this container.
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* @param TData Data, data associated with the key
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* @param Hasher Hasher object, needs to provide a valid static hash function for TKey
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* @param MIN_HASH_TABLE_POWER Miminum size of the hash table, as a power of two. You rarely need to change this parameter.
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* @param RELATIONSHIP Relationship at which the hash table is resized. if amount of elements is RELATIONSHIP
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* times bigger than the hash table, table is resized to solve this condition. if RELATIONSHIP is zero, table is always MIN_HASH_TABLE_POWER.
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*
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*/
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template<class TKey, class TData, class Hasher=HashMapHahserDefault,uint8_t MIN_HASH_TABLE_POWER=3,uint8_t RELATIONSHIP=8>
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class HashMap {
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public:
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struct Pair {
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TKey key;
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TData data;
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Pair() {}
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Pair(const TKey& p_key, const TData& p_data) { key=p_key; data=p_data; }
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};
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private:
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struct Entry {
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uint32_t hash;
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Entry *next;
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Pair pair;
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Entry() { next=0; }
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};
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Entry **hash_table;
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uint8_t hash_table_power;
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uint32_t elements;
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void make_hash_table() {
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ERR_FAIL_COND( hash_table );
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hash_table = memnew_arr( Entry*, (1<<MIN_HASH_TABLE_POWER) );
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hash_table_power = MIN_HASH_TABLE_POWER;
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elements=0;
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for (int i=0;i<(1<<MIN_HASH_TABLE_POWER);i++)
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hash_table[i]=0;
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}
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void erase_hash_table() {
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ERR_FAIL_COND(elements);
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memdelete_arr( hash_table );
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hash_table=0;
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hash_table_power=0;
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elements=0;
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}
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void check_hash_table() {
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int new_hash_table_power=-1;
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if ((int)elements > ( (1<<hash_table_power) * RELATIONSHIP ) ) {
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/* rehash up */
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new_hash_table_power=hash_table_power+1;
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while( (int)elements > ( (1<<new_hash_table_power) * RELATIONSHIP ) ) {
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new_hash_table_power++;
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}
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} else if ( (hash_table_power>(int)MIN_HASH_TABLE_POWER) && ((int)elements < ( (1<<(hash_table_power-1)) * RELATIONSHIP ) ) ) {
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/* rehash down */
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new_hash_table_power=hash_table_power-1;
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while( (int)elements < ( (1<<(new_hash_table_power-1)) * RELATIONSHIP ) ) {
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new_hash_table_power--;
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}
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if (new_hash_table_power<(int)MIN_HASH_TABLE_POWER)
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new_hash_table_power=MIN_HASH_TABLE_POWER;
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}
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if (new_hash_table_power==-1)
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return;
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Entry ** new_hash_table = memnew_arr( Entry*, (1<<new_hash_table_power) );
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if (!new_hash_table) {
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ERR_PRINT("Out of Memory");
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return;
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}
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for (int i=0;i<(1<<new_hash_table_power);i++) {
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new_hash_table[i]=0;
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}
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for (int i=0;i<(1<<hash_table_power);i++) {
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while( hash_table[i] ) {
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Entry *se=hash_table[i];
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hash_table[i]=se->next;
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int new_pos = se->hash & ((1<<new_hash_table_power)-1);
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se->next=new_hash_table[new_pos];
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new_hash_table[new_pos]=se;
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}
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}
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if (hash_table)
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memdelete_arr( hash_table );
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hash_table=new_hash_table;
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hash_table_power=new_hash_table_power;
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}
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/* I want to have only one function.. */
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_FORCE_INLINE_ const Entry * get_entry( const TKey& p_key ) const {
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uint32_t hash = Hasher::hash( p_key );
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uint32_t index = hash&((1<<hash_table_power)-1);
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Entry *e = hash_table[index];
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while (e) {
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/* checking hash first avoids comparing key, which may take longer */
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if (e->hash == hash && e->pair.key == p_key ) {
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/* the pair exists in this hashtable, so just update data */
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return e;
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}
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e=e->next;
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}
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return NULL;
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}
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Entry * create_entry(const TKey& p_key) {
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/* if entry doesn't exist, create it */
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Entry *e = memnew( Entry );
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ERR_FAIL_COND_V(!e,NULL); /* out of memory */
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uint32_t hash = Hasher::hash( p_key );
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uint32_t index = hash&((1<<hash_table_power)-1);
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e->next = hash_table[index];
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e->hash = hash;
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e->pair.key=p_key;
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hash_table[index]=e;
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elements++;
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return e;
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}
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void copy_from(const HashMap& p_t) {
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if (&p_t==this)
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return; /* much less bother with that */
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clear();
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if (!p_t.hash_table || p_t.hash_table_power==0)
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return; /* not copying from empty table */
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hash_table = memnew_arr(Entry*,1<<p_t.hash_table_power);
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hash_table_power=p_t.hash_table_power;
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elements=p_t.elements;
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for (int i=0;i<( 1<<p_t.hash_table_power );i++) {
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hash_table[i]=NULL;
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/* elements will be in the reverse order, but it doesn't matter */
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const Entry *e = p_t.hash_table[i];
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while(e) {
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Entry *le = memnew( Entry ); /* local entry */
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*le=*e; /* copy data */
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/* add to list and reassign pointers */
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le->next=hash_table[i];
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hash_table[i]=le;
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e=e->next;
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}
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}
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}
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public:
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void set( const TKey& p_key, const TData& p_data ) {
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set( Pair( p_key, p_data ) );
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}
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void set( const Pair& p_pair ) {
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Entry *e=NULL;
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if (!hash_table)
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make_hash_table(); // if no table, make one
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else
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e = const_cast<Entry*>( get_entry(p_pair.key) );
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/* if we made it up to here, the pair doesn't exist, create and assign */
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if (!e) {
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e=create_entry(p_pair.key);
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if (!e)
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return;
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check_hash_table(); // perform mantenience routine
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}
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e->pair.data = p_pair.data;
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}
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bool has( const TKey& p_key ) const {
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return getptr(p_key)!=NULL;
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}
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/**
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* Get a key from data, return a const reference.
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* WARNING: this doesn't check errors, use either getptr and check NULL, or check
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* first with has(key)
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*/
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const TData& get( const TKey& p_key ) const {
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const TData* res = getptr(p_key);
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ERR_FAIL_COND_V(!res,*res);
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return *res;
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}
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TData& get( const TKey& p_key ) {
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TData* res = getptr(p_key);
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ERR_FAIL_COND_V(!res,*res);
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return *res;
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}
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/**
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* Same as get, except it can return NULL when item was not found.
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* This is mainly used for speed purposes.
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*/
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_FORCE_INLINE_ TData* getptr( const TKey& p_key ) {
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if (!hash_table)
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return NULL;
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Entry *e=const_cast<Entry*>(get_entry(p_key ));
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if (e)
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return &e->pair.data;
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return NULL;
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}
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_FORCE_INLINE_ const TData* getptr( const TKey& p_key ) const {
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if (!hash_table)
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return NULL;
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const Entry *e=const_cast<Entry*>(get_entry(p_key ));
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if (e)
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return &e->pair.data;
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return NULL;
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}
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/**
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* Same as get, except it can return NULL when item was not found.
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* This version is custom, will take a hash and a custom key (that should support operator==()
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*/
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template<class C>
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_FORCE_INLINE_ TData* custom_getptr( C p_custom_key,uint32_t p_custom_hash ) {
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if (!hash_table)
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return NULL;
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uint32_t hash = p_custom_hash;
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uint32_t index = hash&((1<<hash_table_power)-1);
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Entry *e = hash_table[index];
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while (e) {
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/* checking hash first avoids comparing key, which may take longer */
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if (e->hash == hash && e->pair.key == p_custom_key ) {
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/* the pair exists in this hashtable, so just update data */
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return &e->pair.data;
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}
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e=e->next;
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}
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return NULL;
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}
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template<class C>
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_FORCE_INLINE_ const TData* custom_getptr( C p_custom_key,uint32_t p_custom_hash ) const {
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if (!hash_table)
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return NULL;
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uint32_t hash = p_custom_hash;
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uint32_t index = hash&((1<<hash_table_power)-1);
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const Entry *e = hash_table[index];
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while (e) {
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/* checking hash first avoids comparing key, which may take longer */
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if (e->hash == hash && e->pair.key == p_custom_key ) {
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/* the pair exists in this hashtable, so just update data */
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return &e->pair.data;
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}
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e=e->next;
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}
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return NULL;
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}
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/**
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* Erase an item, return true if erasing was succesful
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*/
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bool erase( const TKey& p_key ) {
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if (!hash_table)
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return false;
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uint32_t hash = Hasher::hash( p_key );
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uint32_t index = hash&((1<<hash_table_power)-1);
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Entry *e = hash_table[index];
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Entry *p=NULL;
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while (e) {
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/* checking hash first avoids comparing key, which may take longer */
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if (e->hash == hash && e->pair.key == p_key ) {
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if (p) {
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p->next=e->next;
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} else {
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//begin of list
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hash_table[index]=e->next;
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}
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memdelete(e);
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elements--;
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if (elements==0)
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erase_hash_table();
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else
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check_hash_table();
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return true;
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}
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p=e;
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e=e->next;
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}
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return false;
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}
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inline const TData& operator[](const TKey& p_key) const { //constref
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return get(p_key);
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}
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inline TData& operator[](const TKey& p_key ) { //assignment
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Entry *e=NULL;
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if (!hash_table)
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make_hash_table(); // if no table, make one
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else
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e = const_cast<Entry*>( get_entry(p_key) );
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/* if we made it up to here, the pair doesn't exist, create */
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if (!e) {
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e=create_entry(p_key);
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if (!e)
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return *(TData*)NULL; /* panic! */
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check_hash_table(); // perform mantenience routine
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}
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return e->pair.data;
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}
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/**
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* Get the next key to p_key, and the first key if p_key is null.
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* Returns a pointer to the next key if found, NULL otherwise.
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* Adding/Removing elements while iterating will, of course, have unexpected results, don't do it.
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*
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* Example:
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*
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* const TKey *k=NULL;
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*
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* while( (k=table.next(k)) ) {
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*
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* print( *k );
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* }
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*
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*/
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const TKey* next(const TKey* p_key) const {
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if (!hash_table) return NULL;
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if (!p_key) { /* get the first key */
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for (int i=0;i<(1<<hash_table_power);i++) {
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if (hash_table[i]) {
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return &hash_table[i]->pair.key;
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}
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}
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} else { /* get the next key */
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const Entry *e = get_entry( *p_key );
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ERR_FAIL_COND_V( !e, NULL ); /* invalid key supplied */
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if (e->next) {
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/* if there is a "next" in the list, return that */
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return &e->next->pair.key;
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} else {
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/* go to next entries */
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uint32_t index = e->hash&((1<<hash_table_power)-1);
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index++;
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for (int i=index;i<(1<<hash_table_power);i++) {
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if (hash_table[i]) {
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return &hash_table[i]->pair.key;
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}
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}
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}
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/* nothing found, was at end */
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}
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return NULL; /* nothing found */
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}
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inline unsigned int size() const {
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return elements;
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}
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inline bool empty() const {
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return elements==0;
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}
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void clear() {
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/* clean up */
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|
if (hash_table) {
|
|
for (int i=0;i<(1<<hash_table_power);i++) {
|
|
|
|
while (hash_table[i]) {
|
|
|
|
Entry *e=hash_table[i];
|
|
hash_table[i]=e->next;
|
|
memdelete( e );
|
|
}
|
|
}
|
|
|
|
memdelete_arr( hash_table );
|
|
}
|
|
|
|
hash_table=0;
|
|
hash_table_power=0;
|
|
elements=0;
|
|
}
|
|
|
|
|
|
void operator=(const HashMap& p_table) {
|
|
|
|
copy_from(p_table);
|
|
}
|
|
|
|
HashMap() {
|
|
hash_table=NULL;
|
|
elements=0;
|
|
hash_table_power=0;
|
|
}
|
|
|
|
void get_key_list(List<TKey> *p_keys) const {
|
|
if (!hash_table)
|
|
return;
|
|
for(int i=0;i<(1<<hash_table_power);i++) {
|
|
|
|
Entry *e=hash_table[i];
|
|
while(e) {
|
|
p_keys->push_back(e->pair.key);
|
|
e=e->next;
|
|
}
|
|
}
|
|
}
|
|
|
|
HashMap(const HashMap& p_table) {
|
|
|
|
hash_table=NULL;
|
|
elements=0;
|
|
hash_table_power=0;
|
|
|
|
copy_from(p_table);
|
|
|
|
}
|
|
|
|
~HashMap() {
|
|
|
|
clear();
|
|
}
|
|
|
|
};
|
|
|
|
#endif
|