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163 lines
3.7 KiB
C
163 lines
3.7 KiB
C
/*
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* mms_value_cache.c
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*
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* Copyright 2013 Michael Zillgith
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*
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* This file is part of libIEC61850.
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*
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* libIEC61850 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* libIEC61850 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libIEC61850. If not, see <http://www.gnu.org/licenses/>.
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*
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* See COPYING file for the complete license text.
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*/
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#include "libiec61850_platform_includes.h"
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#include "mms_value_cache.h"
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#include "string_map.h"
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#include "stack_config.h"
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struct sMmsValueCache {
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MmsDomain* domain;
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Map map;
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};
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typedef struct sMmsValueCacheEntry {
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MmsValue* value;
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MmsVariableSpecification* typeSpec;
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} MmsValueCacheEntry;
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MmsValueCache
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MmsValueCache_create(MmsDomain* domain)
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{
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MmsValueCache self = (MmsValueCache) GLOBAL_CALLOC(1, sizeof(struct sMmsValueCache));
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self->domain = domain;
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self->map = StringMap_create();
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return self;
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}
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void
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MmsValueCache_insertValue(MmsValueCache self, char* itemId, MmsValue* value)
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{
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MmsVariableSpecification* typeSpec = MmsDomain_getNamedVariable(self->domain, itemId);
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if (typeSpec != NULL) {
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MmsValueCacheEntry* cacheEntry = (MmsValueCacheEntry*) GLOBAL_MALLOC(sizeof(MmsValueCacheEntry));
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cacheEntry->value = value;
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cacheEntry->typeSpec = typeSpec;
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Map_addEntry(self->map, StringUtils_copyString(itemId), cacheEntry);
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}
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else
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if (DEBUG) printf("Cannot insert value into cache %s : no typeSpec found!\n", itemId);
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}
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static char*
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getParentSubString(char* itemId)
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{
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int len = strlen(itemId);
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char* strPos = itemId + len;
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while (--strPos > itemId) {
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if (*strPos == '$') {
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*strPos = 0;
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return itemId;
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}
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}
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return NULL;
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}
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static const char*
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getChildSubString (const char* itemId, char* parentId)
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{
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return itemId + strlen(parentId) + 1;
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}
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static MmsValue*
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searchCacheForValue(MmsValueCache self, const char* itemId, char* parentId)
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{
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MmsValueCacheEntry* cacheEntry;
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MmsValue* value = NULL;
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cacheEntry = (MmsValueCacheEntry*) Map_getEntry(self->map, (void*) parentId);
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if (cacheEntry == NULL) {
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char* parentItemId = getParentSubString(parentId);
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if (parentItemId != NULL) {
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value = searchCacheForValue(self, itemId, parentItemId);
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}
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}
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else {
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const char* childId = getChildSubString(itemId, parentId);
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MmsVariableSpecification* typeSpec = MmsDomain_getNamedVariable(self->domain, parentId);
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value = MmsVariableSpecification_getChildValue(typeSpec, cacheEntry->value, childId);
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}
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return value;
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}
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MmsValue*
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MmsValueCache_lookupValue(MmsValueCache self, const char* itemId)
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{
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/*
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* get value for first matching key substring!
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* Then iterate the value for the exact value.
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*/
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MmsValue* value = NULL;
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MmsValueCacheEntry* cacheEntry;
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cacheEntry = (MmsValueCacheEntry*) Map_getEntry(self->map, (void*) itemId);
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if (cacheEntry == NULL) {
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char* itemIdCopy = StringUtils_copyString(itemId);
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char* parentItemId = getParentSubString(itemIdCopy);
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if (parentItemId != NULL) {
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value = searchCacheForValue(self, itemId, parentItemId);
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}
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GLOBAL_FREEMEM(itemIdCopy);
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}
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if (cacheEntry != NULL)
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return cacheEntry->value;
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else
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return value;
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}
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static void
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cacheEntryDelete(MmsValueCacheEntry* entry)
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{
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if (entry != NULL) {
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MmsValue_delete(entry->value);
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GLOBAL_FREEMEM(entry);
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}
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}
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void
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MmsValueCache_destroy(MmsValueCache self)
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{
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Map_deleteDeep(self->map, true, (void (*) (void*)) cacheEntryDelete);
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GLOBAL_FREEMEM(self);
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}
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