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#include "mapper.h"
intermediateDS DS;
// combined value list corresponding to a word <1,1,1,1....>
valueList *createNewValueListNode(char *value){
valueList *newNode = (valueList *)malloc (sizeof(valueList));
strcpy(newNode -> value, value);
newNode -> next = NULL;
return newNode;
}
// insert new count to value list
valueList *insertNewValueToList(valueList *root, char *count){
valueList *tempNode = root;
if(root == NULL)
return createNewValueListNode(count);
while(tempNode -> next != NULL)
tempNode = tempNode -> next;
tempNode -> next = createNewValueListNode(count);
return root;
}
// free value list
void freeValueList(valueList *root) {
if(root == NULL) return;
valueList *tempNode = NULL;
while (root != NULL){
tempNode = root;
root = root -> next;
free(tempNode);
}
}
// create <word, value list>
intermediateDS *createNewInterDSNode(char *word, char *count){
intermediateDS *newNode = (intermediateDS *)malloc (sizeof(intermediateDS));
strcpy(newNode -> key, word);
newNode -> value = NULL;
newNode -> value = insertNewValueToList(newNode -> value, count);
newNode -> next = NULL;
return newNode;
}
// insert or update a <word, value> to intermediate DS
intermediateDS *insertPairToInterDS(intermediateDS *root, char *word, char *count){
intermediateDS *tempNode = root;
if(root == NULL)
return createNewInterDSNode(word, count);
while(tempNode -> next != NULL) {
if(strcmp(tempNode -> key, word) == 0){
tempNode -> value = insertNewValueToList(tempNode -> value, count);
return root;
}
tempNode = tempNode -> next;
}
if(strcmp(tempNode -> key, word) == 0){
tempNode -> value = insertNewValueToList(tempNode -> value, count);
} else {
tempNode -> next = createNewInterDSNode(word, count);
}
return root;
}
// free the DS after usage. Call this once you are done with the writing of DS into file
void freeInterDS(intermediateDS *root) {
if(root == NULL) return;
intermediateDS *tempNode = NULL;
while (root != NULL){
tempNode = root;
root = root -> next;
freeValueList(tempNode -> value);
free(tempNode);
}
}
// emit the <key, value> into intermediate DS
// eats the data into the DS
void emit(char *key, char *value) {
insertPairToInterDS(&DS, key, value);
}
// map function
void map(char *chunkData){
int i = 0;
char *buffer;
while ((buffer = getWord(chunkData, &i)) != NULL){
// get words from buffer & give it to emitter to be put into intermediateDS
emit(buffer, "1");
}
// you can use getWord to retrieve words from the
// chunkData one by one. Example usage in utils.h
}
// write intermediate data to separate word.txt files
// Each file will have only one line : word 1 1 1 1 1 ...
// poops the data out into separate .txt files named after the word
void writeIntermediateDS() {
intermediateDS *root = &DS;
intermediateDS *tempNode = root;
valueList *tempNode2 = root -> value;
while(tempNode != NULL) {
// Get string of 1's associated with the word
char ones[100]= "";
tempNode2 = tempNode -> value;
while(tempNode2 != NULL) {
//printf("This loop is being run\n");
strcat(ones, "1 ");
tempNode2 = tempNode2 -> next;
}
// Shove word and ones in a file named word.txt
char filename[150];
sprintf(filename, "output/MapOut/Map_%d/%s.txt", mapperID, tempNode -> key);
FILE* fptr = fopen(filename, "w");
fprintf(fptr, "%s %s", tempNode -> key, ones);
fclose(fptr);
tempNode = tempNode -> next;
}
freeInterDS(root);
}
int main(int argc, char *argv[]) {
if (argc < 2) {
printf("Less number of arguments.\n");
printf("./mapper mapperID\n");
exit(0);
}
// ###### DO NOT REMOVE ######
mapperID = strtol(argv[1], NULL, 10);
// ###### DO NOT REMOVE ######
// create folder specifically for this mapper in output/MapOut
// mapOutDir has the path to the folder where the outputs of
// this mapper should be stored
mapOutDir = createMapDir(mapperID);
// ###### DO NOT REMOVE ######
while(1) {
// create an array of chunkSize=1024B and intialize all
// elements with '\0'
char chunkData[chunkSize + 1]; // +1 for '\0'
memset(chunkData, '\0', chunkSize + 1);
char *retChunk = getChunkData(mapperID);
if(retChunk == NULL) {
break;
}
strcpy(chunkData, retChunk);
free(retChunk);
map(chunkData);
}
// ###### DO NOT REMOVE ######
writeIntermediateDS();
return 0;
}
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