// Now finding the common lines from both the files.
// public static void printJoinResult(List<String> tab1_attr, List<String> tab2_attr){
public static void printJoinResult(List<String> tab1_attr, List<String> tab2_attr) {
int i = 0;
int j = 0;
BufferedReader br_tab1 = null;
BufferedReader br_tab2 = null;
try {
br_tab1 = new BufferedReader(new FileReader(new File(getSortedFile(tab1))));
br_tab2 = new BufferedReader(new FileReader(new File(getSortedFile(tab2))));
String tab1_line = null;
String tab2_line = null;
tab1_line = br_tab1.readLine();
tab2_line = br_tab2.readLine();
while (tab1_line != null && tab2_line != null) {
// System.out.println("PO");
// System.out.println(tab1_line + " with " + tab2_line );
int op = compareTabLines(tab1_line, tab2_line);
if (op == 0) { // both are equal
// System.out.println(tab1_line + " --" + tab2_line);
List<String> ltab1 = new ArrayList<String>();
List<String> ltab2 = new ArrayList<String>();
ltab1.add(tab1_line);
ltab2.add(tab2_line);
String t1_line = br_tab1.readLine();
String t2_line = br_tab2.readLine();
if (t1_line != null) {
int y;
// System.out.println(tab1_line + "=========" + t1_line);
while ((y = compareTab1Line(tab1_line, t1_line)) == 0) {
ltab1.add(t1_line);
t1_line = br_tab1.readLine();
}
}
if (t2_line != null) {
int u;
// System.out.println(tab2_line + "++++++++++++" + t2_line + compareTabLines(tab2_line,
// t2_line));
while ((u = compareTab2Line(tab2_line, t2_line)) == 0) {
ltab2.add(t2_line);
t2_line = br_tab2.readLine();
}
}
HashMap<String, Integer> colNum1 = null, colNum2 = null;
Iterator<Table> it = DBSystem.tableList.iterator();
while (it.hasNext()) {
Table t = it.next();
if (t.getName().equalsIgnoreCase(tab1)) {
colNum1 = t.getColumnNum();
}
if (t.getName().equalsIgnoreCase(tab2)) {
colNum2 = t.getColumnNum();
}
}
/*Iterator<String> it1=tab1_attr.iterator();
while (it1.hasNext()){
System.out.print(tab1 + "." + it1.next());
if(it1.hasNext())
System.out.print(",");
}
Iterator<String> it2=tab2_attr.iterator();
while (it2.hasNext()){
System.out.print(tab2 + "." + it2.next());
if(it2.hasNext())
System.out.print(",");
}*/
for (int q = 0; q < ltab1.size(); q++) {
for (int w = 0; w < ltab2.size(); w++) {
// System.out.println(ltab1.get(q) + " -- " + ltab2.get(w));
String[] tab1_result = ltab1.get(q).split(",");
String[] tab2_result = ltab2.get(w).split(",");
Iterator<String> it1 = tab1_attr.iterator();
while (it1.hasNext()) {
int c = colNum1.get(it1.next());
System.out.print(tab1_result[c] + ",");
}
Iterator<String> it2 = tab2_attr.iterator();
while (it2.hasNext()) {
int c = colNum2.get(it2.next());
System.out.print(tab2_result[c]);
if (it2.hasNext()) System.out.print(",");
}
System.out.println();
}
}
tab1_line = t1_line;
tab2_line = t2_line;
} else if (op >= 1) { // table1 has bigger value
tab2_line = br_tab2.readLine();
} else if (op <= -1) { // table2 has bigger value
tab1_line = br_tab1.readLine();
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
// Sorts Both the file , individually
// irrespective of their size.
public static void initialize(
String table1, String table1_join_col, String table2, String table2_join_col) {
// System.out.println(DBSystem.PATH_FOR_DATA);
// System.out.println(table1);
tab1 = table1;
tab2 = table2;
for (Table t : DBSystem.tableList) {
if (t.getName().equalsIgnoreCase(table1)) {
table1JoinColIndex = t.getColumnNum().get(table1_join_col);
table1JoinColType = t.getColumnData().get(table1_join_col);
table1Lines = t.getLines();
t1 = t;
} else if (t.getName().equalsIgnoreCase(table2)) {
table2JoinColIndex = t.getColumnNum().get(table2_join_col);
table2JoinColType = t.getColumnData().get(table2_join_col);
table2Lines = t.getLines();
t2 = t;
}
}
// System.out.println(table1 + " - " + table1_join_col + " - " + table1JoinColIndex + " - " +
// table1JoinColType);
// System.out.println(table2 + " - " + table2_join_col + " - " + table2JoinColIndex + " - " +
// table2JoinColType);
if (!table1JoinColType.equalsIgnoreCase(table2JoinColType)) {
System.out.println("Both the tables must have similar join types");
System.exit(1);
}
int numberOfcolumnsForJoin = 2; // For Joining Two tables
// Sort the columns used for join
for (int k = 0; k < numberOfcolumnsForJoin; k++) {
String tab = null;
String tabColType = null;
int tabColIndex = 0;
int tLines = 0;
if (k == 0) {
// Sorting table 1.
tab = table1;
tabColType = table1JoinColType;
tabColIndex = table1JoinColIndex;
tLines = table1Lines;
} else if (k == 1) {
// Sorting table 2
tab = table2;
tabColType = table2JoinColType;
tabColIndex = table2JoinColIndex;
tLines = table2Lines;
}
Comparator<String> cmp = new SortingComparator(tabColIndex, tabColType);
PriorityQueue<String> priorityQueue = new PriorityQueue<String>(10, cmp);
int remainingBufferSize = MAX_MEM_TO_USE;
int fileCount = 1;
String line;
int inOutFlag = 0;
for (int i = 0; i < tLines; i++) {
line = DBSystem.getRecord(tab, i);
// System.out.println(line);
// String cols [] = line.split(",");
remainingBufferSize -= line.getBytes().length;
if (remainingBufferSize >= 0) {
priorityQueue.add(line);
inOutFlag = 1;
} else {
// write to file
FileWriter fileWriter = null;
// System.out.println("Written");
try {
// String fileName = setBlockFile(fileCount,table1);
// System.out.println(fileName);
fileWriter = new FileWriter(new File(setBlockFile(fileCount, tab)));
int siz = priorityQueue.size();
// System.out.println(siz);
for (int j = 0; j < siz; j++) {
fileWriter.write(priorityQueue.poll().toString());
// System.out.println(priorityQueue.poll().toString());
fileWriter.write("\n");
}
fileCount++;
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fileWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// set remainingSize back to MAX_MEM_TO_USE
remainingBufferSize = MAX_MEM_TO_USE;
// current read line
priorityQueue.add(line);
remainingBufferSize -= line.getBytes().length;
inOutFlag = 0;
}
}
if (inOutFlag == 1) {
FileWriter fw = null;
try {
fw = new FileWriter(new File(setBlockFile(fileCount, tab)));
int psiz = priorityQueue.size();
for (int j = 0; j < psiz; j++) {
fw.write(priorityQueue.poll().toString());
// System.out.println(priorityQueue.poll().toString());
fw.write("\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
if (k == 0) table1_tempfileCount = fileCount;
if (k == 1) table2_tempfileCount = fileCount;
}
// Begin the merging process for both the files.
// System.out.println(table1_tempfileCount);
// System.out.println(table2_tempfileCount);
// Merging Process
SortedMergeJoin sortedMergeJoin =
new SortedMergeJoin(
table1,
table1_tempfileCount,
table1JoinColIndex,
table1JoinColType,
table2,
table2_tempfileCount,
table2JoinColIndex,
table2JoinColType);
sortedMergeJoin.execute();
}