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Transaction.cpp

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00001 /*
00002  
00003 Copyright (c) 2003, Cornell University
00004 All rights reserved.
00005  
00006 Redistribution and use in source and binary forms, with or without
00007 modification, are permitted provided that the following conditions are met:
00008  
00009     - Redistributions of source code must retain the above copyright notice,
00010         this list of conditions and the following disclaimer.
00011     - Redistributions in binary form must reproduce the above copyright
00012         notice, this list of conditions and the following disclaimer in the
00013         documentation and/or other materials provided with the distribution.
00014     - Neither the name of Cornell University nor the names of its
00015         contributors may be used to endorse or promote products derived from
00016         this software without specific prior written permission.
00017  
00018 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00019 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00020 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00021 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00022 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00023 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00024 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00025 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00026 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00027 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
00028 THE POSSIBILITY OF SUCH DAMAGE.
00029  
00030 */
00031 
00032 /////////////////////////////////////////////////////////////////////
00033 ///
00034 /// Transaction.cpp
00035 ///
00036 /////////////////////////////////////////////////////////////////////
00037 
00038 #include "Transaction.h"
00039 #include <vector>
00040 #include <algorithm>
00041 using namespace std;
00042 
00043 /////////////////////////////////////////////////////////////////////
00044 /// @addtogroup InputOutput
00045 /** @{ */
00046 
00047 /////////////////////////////////////////////////////////////////////
00048 /// Get next transaction from the input file
00049 ///
00050 /// @return     pointer to a new Transaction
00051 /////////////////////////////////////////////////////////////////////
00052 Transaction *InputData::getNextTransaction() {
00053     char c;
00054 
00055     int itemIndex = 0;
00056     if (isAsciiFile) {
00057         // read list of items
00058         do {
00059             int item = 0, pos = 0;
00060             inputFile.get(c);
00061             while (!inputFile.eof() && (c >= '0') && (c <= '9')) {
00062                 item *= 10;
00063                 item += int(c) - int('0');
00064                 inputFile.get(c);
00065                 pos++;
00066             }
00067 
00068             if (pos) {
00069                 itembuffer[itemIndex] = item;
00070                 itemIndex++;
00071             }
00072         } while (!inputFile.eof() && c != '\n');
00073 
00074         // if end of file is reached
00075         if (itemIndex == 0)
00076             return 0;
00077     } else {
00078         int custid;              // customer id (NOT used currently)
00079         int transid;             // transaction id
00080         int nitems = 0;              // number of items in the transaction
00081 
00082         if (!inputFile.eof()) {
00083             // read in the transaction
00084             inputFile.read((char *)&custid, sizeof(int));
00085             inputFile.read((char *)&transid, sizeof(int));
00086             inputFile.read((char *)&nitems, sizeof(int));      
00087 
00088             // ensure that there are not too many items
00089             if (nitems >= MAX_NUM_ITEMS) {
00090                 cout << "More than " << MAX_NUM_ITEMS
00091                 << " items in customer id: " << custid
00092                 << " transaction id: " << transid;
00093                 exit(1);
00094             }
00095 
00096             // Read in the items of the transaction
00097             inputFile.read((char *)itembuffer, nitems * sizeof(int));
00098         }
00099         
00100         itemIndex = nitems;
00101         if (itemIndex == 0)
00102             return 0;
00103     }
00104 
00105     // Note, also last transaction must end with newline,
00106     // else, it will be ignored
00107 
00108     // sort list of items (this is not necessary for the workshop test datasets)
00109     // sort(list.begin(),list.end());
00110 
00111     // put items in Transaction structure
00112     Transaction *newTransaction = new Transaction(itembuffer, itemIndex);
00113     return newTransaction;
00114 }
00115 
00116 /////////////////////////////////////////////////////////////////////
00117 /// Open the input file
00118 ///
00119 /// @param filename         input filename
00120 /// @param ITEMBUFFER       pointer to buffer for storing a transaction
00121 /// @param IS_ASCII         true if file is in ASCII format
00122 /////////////////////////////////////////////////////////////////////
00123 InputData::InputData(char *filename, int *ITEMBUFFER, bool IS_ASCII) {
00124     if (IS_ASCII)
00125         inputFile.open(filename);
00126     else
00127         inputFile.open(filename, ios::binary);
00128 
00129     isAsciiFile = IS_ASCII;
00130     itembuffer = ITEMBUFFER;
00131 }
00132 
00133 /////////////////////////////////////////////////////////////////////
00134 /// Close the input file
00135 /////////////////////////////////////////////////////////////////////
00136 InputData::~InputData() {
00137     inputFile.close();
00138 }
00139 
00140 /////////////////////////////////////////////////////////////////////
00141 /// Check if the input file is open
00142 ///
00143 /// @return true if file is open
00144 /////////////////////////////////////////////////////////////////////
00145 int InputData::isOpen() {
00146     return inputFile.is_open();
00147 }
00148 /** @} */

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