comparison create.cpp @ 204:2ea1908707c7 refactoring

Filewise refactor.

Break apart huge monolithic audioDB.cpp file into seven broadly
independent portions:

* SOAP
* DB creation
* insertion
* query
* dump
* common functionality
* constructor functions

Remove the "using namespace std" from the header file, though that
wasn't actually a problem: the problem in question is solved by
including adb.nsmap in only soap.cpp.

Makefile improvements.

+#include "audioDB.h"
+
+/* Make a new database.
+
+   The database consists of:
+
+   * a header (see dbTableHeader struct definition);
+   * keyTable: list of keys of tracks;
+   * trackTable: Maps implicit feature index to a feature vector
+     matrix (sizes of tracks)
+   * featureTable: Lots of doubles;
+   * timesTable: (start,end) time points for each feature vector;
+   * powerTable: associated power for each feature vector;
+   * l2normTable: squared l2norms for each feature vector.
+*/
+
+void audioDB::create(const char* dbName){
+  if ((dbfid = open (dbName, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) < 0)
+    error("Can't create database file", dbName, "open");
+  get_lock(dbfid, 1);
+
+  if(verbosity) {
+    std::cerr << "header size:" << O2_HEADERSIZE << std::endl;
+  }
+  
+  dbH = new dbTableHeaderT();
+  assert(dbH);
+
+  unsigned int maxfiles = (unsigned int) rint((double) O2_MAXFILES * (double) size / (double) O2_DEFAULTDBSIZE);
+
+  // Initialize header
+  dbH->magic = O2_MAGIC;
+  dbH->version = O2_FORMAT_VERSION;
+  dbH->numFiles = 0;
+  dbH->dim = 0;
+  dbH->flags = 0;
+  dbH->length = 0;
+  dbH->fileTableOffset = ALIGN_PAGE_UP(O2_HEADERSIZE);
+  dbH->trackTableOffset = ALIGN_PAGE_UP(dbH->fileTableOffset + O2_FILETABLESIZE*maxfiles);
+  dbH->dataOffset = ALIGN_PAGE_UP(dbH->trackTableOffset + O2_TRACKTABLESIZE*maxfiles);
+  dbH->l2normTableOffset = ALIGN_PAGE_DOWN(size - maxfiles*O2_MEANNUMVECTORS*sizeof(double));
+  dbH->powerTableOffset = ALIGN_PAGE_DOWN(dbH->l2normTableOffset - maxfiles*O2_MEANNUMVECTORS*sizeof(double));
+  dbH->timesTableOffset = ALIGN_PAGE_DOWN(dbH->powerTableOffset - 2*maxfiles*O2_MEANNUMVECTORS*sizeof(double));
+  dbH->dbSize = size;
+
+  write(dbfid, dbH, O2_HEADERSIZE);
+
+  // go to the location corresponding to the last byte
+  if (lseek (dbfid, size - 1, SEEK_SET) == -1)
+    error("lseek error in db file", "", "lseek");
+
+  // write a dummy byte at the last location
+  if (write (dbfid, "", 1) != 1)
+    error("write error", "", "write");
+  
+  if(verbosity) {
+    std::cerr << COM_CREATE << " " << dbName << std::endl;
+  }
+}
+
+void audioDB::drop(){
+  // FIXME: drop something?  Should we even allow this?
+}
+