/* Copyright (c) 2003, Cornell UniversityAll rights reserved. Redistribution and use in source and binary forms, with or withoutmodification, are permitted provided that the following conditions are met:     - Redistributions of source code must retain the above copyright notice,        this list of conditions and the following disclaimer.    - Redistributions in binary form must reproduce the above copyright        notice, this list of conditions and the following disclaimer in the        documentation and/or other materials provided with the distribution.    - Neither the name of Cornell University nor the names of its        contributors may be used to endorse or promote products derived from        this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THEIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSEARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BELIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, ORCONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OFSUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESSINTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER INCONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OFTHE POSSIBILITY OF SUCH DAMAGE. *//////////////////////////////////////////////////////////////////////////// Transaction.cpp////////////////////////////////////////////////////////////////////////#include "Transaction.h"#include <vector>#include <algorithm>using namespace std;//////////////////////////////////////////////////////////////////////// @addtogroup InputOutput/** @{ *///////////////////////////////////////////////////////////////////////// Get next transaction from the input file////// @return     pointer to a new Transaction/////////////////////////////////////////////////////////////////////Transaction *InputData::getNextTransaction() {    char c;    int itemIndex = 0;    if (isAsciiFile) {        // read list of items        do {            int item = 0, pos = 0;            inputFile.get(c);            while (!inputFile.eof() && (c >= '0') && (c <= '9')) {                item *= 10;                item += int(c) - int('0');                inputFile.get(c);                pos++;            }            if (pos) {                itembuffer[itemIndex] = item;                itemIndex++;            }        } while (!inputFile.eof() && c != '\n');        // if end of file is reached        if (itemIndex == 0)            return 0;    } else {        int custid;              // customer id (NOT used currently)        int transid;             // transaction id        int nitems = 0;              // number of items in the transaction        if (!inputFile.eof()) {            // read in the transaction            inputFile.read((char *)&custid, sizeof(int));            inputFile.read((char *)&transid, sizeof(int));            inputFile.read((char *)&nitems, sizeof(int));                  // ensure that there are not too many items            if (nitems >= MAX_NUM_ITEMS) {                cout << "More than " << MAX_NUM_ITEMS                << " items in customer id: " << custid                << " transaction id: " << transid;                exit(1);            }            // Read in the items of the transaction            inputFile.read((char *)itembuffer, nitems * sizeof(int));        }                itemIndex = nitems;        if (itemIndex == 0)            return 0;    }    // Note, also last transaction must end with newline,    // else, it will be ignored    // sort list of items (this is not necessary for the workshop test datasets)    // sort(list.begin(),list.end());    // put items in Transaction structure    Transaction *newTransaction = new Transaction(itembuffer, itemIndex);    return newTransaction;}//////////////////////////////////////////////////////////////////////// Open the input file////// @param filename         input filename/// @param ITEMBUFFER       pointer to buffer for storing a transaction/// @param IS_ASCII         true if file is in ASCII format/////////////////////////////////////////////////////////////////////InputData::InputData(char *filename, int *ITEMBUFFER, bool IS_ASCII) {    if (IS_ASCII)        inputFile.open(filename);    else        inputFile.open(filename, ios::binary);    isAsciiFile = IS_ASCII;    itembuffer = ITEMBUFFER;}//////////////////////////////////////////////////////////////////////// Close the input file/////////////////////////////////////////////////////////////////////InputData::~InputData() {    inputFile.close();}//////////////////////////////////////////////////////////////////////// Check if the input file is open////// @return true if file is open/////////////////////////////////////////////////////////////////////int InputData::isOpen() {    return inputFile.is_open();}/** @} */