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hashmap.c
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hashmap.c
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//
// hashmap.c
// NoSQLite
//
// Created by Elie Raffier on 03/07/2015.
// Copyright (c) 2015 Elie Raffier. All rights reserved.
//
#include "hashmap.h"
#include "hashmap_node.h"
#include "record_list.h"
int value_compare(list_value_t* a, list_value_t* b){
if(a->type==b->type)
return compare(a,b);
if(a->type==STRING_TYPE)
return -1;
else
if (b->type==STRING_TYPE)
return 1;
else
return (compare(a,b));
}
void* convert_value(list_value_t* value){
if(value->type==DOUBLE_TYPE){
double d;
double* dp=malloc(sizeof(double));
memcpy(&d,value->value, sizeof(double));
*dp=d;
return dp;
}
if(value->type==INT_TYPE){
int i;
int* ip=malloc(sizeof(int));
memcpy(&i,value->value, sizeof(int));
*ip=i;
return ip;
}
else{
return value->value;
}
}
int compare(list_value_t* avalue, list_value_t* bvalue){
if(avalue->type==STRING_TYPE)
return strcmp(avalue->value,bvalue->value);
if((avalue->type==DOUBLE_TYPE?*(double*)convert_value(avalue):*(int*)convert_value(avalue)) > (bvalue->type==DOUBLE_TYPE?*(double*)convert_value(bvalue):*(int*)convert_value(bvalue))){
return 1;
}
else{
if((avalue->type==DOUBLE_TYPE?*(double*)convert_value(avalue):*(int*)convert_value(avalue)) < (bvalue->type==DOUBLE_TYPE?*(double*)convert_value(bvalue):*(int*)convert_value(bvalue))){
return -1;
}else{
return 0;
}
}
}
uint32_t hashmap_hash(char* key){
size_t len = strlen(key);
uint32_t hash = 0;
uint32_t i = 0;
for(hash = i = 0; i < len; ++i)
{
hash += key[i];
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += (hash << 3);
hash ^= (hash >> 11);
hash += (hash << 15);
return hash;
}
void hashmap_project(hashmap_node_t* result, char** argv, int argc){
int i;
int found=0;
while(result!=NULL){
for(i=0;i<argc;i++){
list_value_t* record = result->lt->record;
while (record!=NULL) {
if(strcmp(argv[i],record->key)==0){
value_print_value(record);
found=1;
}
record=record->next;
}
printf("\t");
}
if(found){
printf("\n");
found=0;
}
result=result->next;
}
}
void hashmap_where(hashmap_node_t** result, char *string){
int found=0;
hashmap_node_t* prev=NULL;
hashmap_node_t* current=*result;
list_value_t* tmprec;
list_value_t* wheres=JSON_parse(string);
list_value_t* tmpw;
while (current!=NULL) {
tmpw=wheres;
while(tmpw!=NULL){
tmprec=current->lt->record;
while (tmprec!=NULL) {
if(strcmp(tmpw->key,tmprec->key)==0 && value_compare(tmpw, tmprec) == 0){
found=1;
}
tmprec=tmprec->next;
}
tmpw=tmpw->next;
}
if(!found){
if (prev) {
prev->next=current->next;
free(current);
current=prev->next;
}
else{
*result=current->next;
free(current);
current=*result;
}
}else{
prev=current;
current=current->next;
}
found=0;
}
}
hashmap_t* hashmap_create(){
int i;
hashmap_t* hashmap=(hashmap_t*)malloc(sizeof(hashmap_t));
for(i=0;i<BUCKET_NUMBER;i++){
hashmap->map[i]=NULL;
}
return hashmap;
}
hashmap_node_t** hashmap_get_bucket(hashmap_t* map, uint32_t hash){
uint32_t bucket_n = hash % BUCKET_NUMBER;
return &map->map[bucket_n];
}
void hashmap_set(hashmap_t *map, hashmap_node_t* node){
hashmap_node_t** bucket = hashmap_get_bucket(map, node->hash);
if(*bucket == NULL){
*bucket = node;
}else{
hashmap_node_append_node(*bucket, node);
}
}
hashmap_node_t* hashmap_find(hashmap_t* hashmap,char *string){
char* key;
list_value_t* find=JSON_parse(string);
key=find->key;
int create=1;
hashmap_node_t* result=NULL;
if(strlen(key)==0){
int i;
for(i=0;i<BUCKET_NUMBER;i++){
hashmap_node_t* tmp=hashmap->map[i];
while (tmp!=NULL) {
if(create){
result=hashmap_node_create(0, tmp->lt);
create=0;
}else
hashmap_node_append_node(result, hashmap_node_create(0, tmp->lt));
tmp=tmp->next;
}
}
return result;
}else{
uint32_t hash=hashmap_hash(key);
hashmap_node_t* bucket = *hashmap_get_bucket(hashmap, hash);
if(bucket==NULL)
return bucket;
else{
while(bucket!=NULL){
if(bucket->hash==hash && strcmp(key,bucket->lt->key)==0 && value_compare(find, bucket->lt)==0){
if(create){
result=hashmap_node_create(hash, bucket->lt);
create=0;
}else
hashmap_node_append_node(result, hashmap_node_create(hash, bucket->lt));
}
bucket=bucket->next;
}
}
return result;
}
}
hashmap_node_t** hashmap_get(hashmap_t* map, char *key){
hashmap_node_t** bucket = hashmap_get_bucket(map, hashmap_hash(key));
return bucket;
}
void hashmap_destroy(hashmap_t* hashmap){
int i;
hashmap_node_t* node;
for(i=0;i<BUCKET_NUMBER;i++){
node=hashmap->map[i];
hashmap_node_destroy_with_values(node);
}
}
list_value_t* JSON_parse(char *string){
char* toParse=NULL;
char** value=malloc(sizeof(char*));
char** key=malloc(sizeof(char*));
int type=0;
int i,j;
i=j=0;
int keylen=0;
int create=1;
list_value_t* list=NULL;
if(string[0] !='{' || string[strlen(string)-1] !='}'){
printf("JSON can't be parsed\n");
return NULL;
}
i++;
j++;
while(string[i]!='}'){
if(string[i]==','){
i++;
toParse=malloc(sizeof(char)*(i-j)+1);
strncpy(toParse,string+j,i-j-1);
toParse[i-j]='\0';
keylen=JSON_extract_key(toParse, key);
type=JSON_extract_value(toParse, value);
if(type==0){
goto error;
}else{
if(create){
list=list_value_create(*key, *value, type);
create=0;
}else{
list_value_append(list, *key, *value, type);
}
}
j=i;
}
i++;
}
toParse=malloc(sizeof(char)*(strlen(string)-j)+1);
strncpy(toParse,string+j,strlen(string+j)-1);
toParse[strlen(string+j)]='\0';
keylen=JSON_extract_key(toParse, key);
type=JSON_extract_value(toParse, value);
if(type==0 || keylen==0){
goto error;
}else{
if(create){
list=list_value_create(*key, *value, type);
create=0;
}else{
list_value_append(list, *key, *value, type);
}
}
return list;
error:
if(!create)
list_value_destroy_all(list);
free(*key);
free(*value);
free(toParse);
return NULL;
}
void hashmap_add_list(hashmap_t* hashmap, list_value_t* lt){
hashmap_node_t* tmp_node;
while(lt!=NULL){
tmp_node = hashmap_node_create(hashmap_hash(lt->key), lt);
hashmap_set(hashmap, tmp_node);
lt=lt->next;
}
}
int JSON_extract_key(char* string, char** keypointer){
int i=0;
while(string[i]!=':' && string[i]!='\0'){
i++;
}
if(string[i]=='\0'){
printf("JSON can't be parsed : Key not found\n");
*keypointer=NULL;
return -1;
}
(*keypointer)=malloc(sizeof(char)*(i+1));
strncpy(*keypointer, string, i);
(*keypointer)[i]='\0';
return i;
}
int JSON_extract_value(char* string, char** valuepointer){
int i,j,k;
j=i=k=0;
int isdecimal=0;
int intvalue=0;
double dvalue=0;
while(string[i]!=':' && string[i]!='\0'){
i++;
}
if(string[i]=='\0'){
*valuepointer=NULL;
return -1;
}
i++;
j=i;
while(string[j]!='\0' && string[j]!='}' && string[j]!=','){
j++;
}
if(string[i] == '\'' || string[i] == '\"'){
if(string[i]!=string[j-1]){
printf("JSON can't be parsed : Incomplete string\n");
*valuepointer=NULL;
return -1;
}else{
(*valuepointer)=malloc(sizeof(char)*(j-i-1));
strncpy(*valuepointer, string+i+1, j-i-2);
(*valuepointer)[j]='\0';
return STRING_TYPE;
}
}else{
for(k=i;k<strlen(string);k++){
if((string[k]<48 || string[k]>57)){
if(string[k]=='.'){
isdecimal=1;
}else{
printf("JSON can't be parsed : Stray char in number\n");
*valuepointer=NULL;
return -1;
}
}
}
if (isdecimal) {
dvalue=strtof(string+i,NULL);
(*valuepointer)=malloc(sizeof(dvalue));
memcpy((*valuepointer), &dvalue, sizeof(dvalue));
return DOUBLE_TYPE;
} else {
intvalue=atoi(string+i);
*valuepointer=malloc(sizeof(int));
memcpy(*valuepointer, &intvalue, sizeof(int));
return INT_TYPE;
}
}
}
hashmap_t* hashmap_load(char * db){
hashmap_t* hashmap=hashmap_create();
FILE* fp;
size_t len = 0;
ssize_t read;
char* line=NULL;
fp = fopen(db, "r");
if (fp == NULL)
return NULL;
while ((read = getline(&line, &len, fp)) != -1) {
if (line[read - 1] == '\n')
line[read - 1] = '\0';
list_value_t* addlist=JSON_parse(line);
hashmap_add_list(hashmap,addlist);
}
fclose(fp);
if (line)
free(line);
return hashmap;
}
void hashmap_save(hashmap_t* hashmap,char* db){
hashmap_node_t* tmpnode;
FILE* file=NULL;
file=fopen(db, "w");
int i;
int create=1;
record_list_t* recordlist=NULL;
record_list_t* tmprecordlist=NULL;
for(i=0;i<BUCKET_NUMBER;i++){
tmpnode=hashmap->map[i];
while(tmpnode!=NULL){
if(create){
recordlist=record_list_create(&(tmpnode->lt->record));
create=0;
}else{
if((tmprecordlist=record_list_contains(recordlist, &tmpnode->lt->record))!=NULL){
record_list_append(tmprecordlist, &(tmpnode->lt->record));
}
}
tmpnode=tmpnode->next;
}
}
while (recordlist!=NULL) {
writeDB(&file,recordlist->record);
recordlist=recordlist->next;
}
fclose(file);
}