biblio_copy_new.php

<?php
/* This file is part of a copyrighted work; it is distributed with NO WARRANTY.
 * See the file COPYRIGHT.html for more details.
 */
 
  require_once("../shared/common.php");
  $tab = "cataloging";
  $nav = "view";
  $restrictInDemo = true;
  require_once("../shared/logincheck.php");

  require_once("../classes/BiblioCopy.php");
  require_once("../classes/BiblioCopyQuery.php");
  require_once("../functions/errorFuncs.php");
  require_once("../classes/Localize.php");
  $loc = new Localize(OBIB_LOCALE,$tab);

  #****************************************************************************
  #*  Checking for post vars.  Go back to form if none found.
  #****************************************************************************

  if (count($_POST) == 0) {
    header("Location: ../catalog/biblio_new.php");
    exit();
  }

  $copyQ = new BiblioCopyQuery();
  $copyQ->connect();
  if ($copyQ->errorOccurred()) {
    $copyQ->close();
    displayErrorPage($copyQ);
  }
  #****************************************************************************
  #*  Autobarco
  #*
  #* FIXME RACE: User A and User B each try to insert a copy concurrently. 
  #* User A's process gets next copy id, then checks for a duplicate barcode,
  #* Before the final insert, though, User B's process asks for the next copy id
  #* and checks for a duplicate barcode.  At that point, both inserts will succeed
  #* and two copies will have the same barcode.  Several different interleavings
  #* either cause the duplicate barcode check to fail or cause duplicate barcodes
  #* to be entered.  This can be fixed with a lock or by an atomic
  #* get-and-increment-sequence-value operation.  I'll fix it later. -- Micah
  #****************************************************************************
  if ((isset($_POST["autobarco"]) and $_POST["autobarco"]) || 0 + $_GET['hits'] > 1) {
    $_POST["barcodeNmbr"] = generateBarcode();
  }

  #****************************************************************************
  #*  Validate data
  #****************************************************************************
  $bibid=$_POST["bibid"];
  $copy = new BiblioCopy();
  $copy->setBibid($bibid);
  $copy->setCopyDesc($_POST["copyDesc"]);
  $_POST["copyDesc"] = $copy->getCopyDesc();
  $copy->setBarcodeNmbr($_POST["barcodeNmbr"]);
  $_POST["barcodeNmbr"] = $copy->getBarcodeNmbr();
  $validData = $copy->validateData();
  if (!$validData) {
    $pageErrors["barcodeNmbr"] = $copy->getBarcodeNmbrError();
    $_SESSION["postVars"] = $_POST;
    $_SESSION["pageErrors"] = $pageErrors;
    header("Location: ../catalog/biblio_copy_new_form.php?bibid=".U($bibid).(empty($_GET['isbn'])?'':"&isbn={$_GET['isbn']}&hits={$_GET['hits']}"));
    exit();
  }

  #**************************************************************************
  #*  Insert new bibliography copy
  #**************************************************************************
  if (0 + $_GET['hits'] > 1) {
    $i = 0;
    do {
      insertCopy();
      $copy->setBarcodeNmbr(generateBarcode());
      $i++;
    } while ($i < 0 + $_GET['hits']);
    
    require_once("../classes/BulkLookup.php");
    $bl = new BulkLookupQuery();
    $bl->clearManualItem($_GET['isbn'], $_GET['hits']);
  }
  else {
    insertCopy();
    if (isset($_GET['isbn'], $_GET['hits'])) {
      require_once("../classes/BulkLookup.php");
      $bl = new BulkLookupQuery();
      $bl->clearManualItem($_GET['isbn'], $_GET['hits']);
    }
  }
  $copyQ->close();

  #**************************************************************************
  #*  Destroy form values and errors
  #**************************************************************************
  unset($_SESSION["postVars"]);
  unset($_SESSION["pageErrors"]);

  $msg = $loc->getText("biblioCopyNewSuccess");
  header("Location: ../shared/biblio_view.php?bibid=".U($bibid)."&msg=".U($msg));
  exit();

  function generateBarcode() {
    global $copyQ;
    $nzeros = "5";
    $bibid=$_POST["bibid"];
    $CopyNmbr = $copyQ->nextCopyid($bibid);
    if ($copyQ->errorOccurred()) {
      $copyQ->close();
      displayErrorPage($copyQ);
    }
    return sprintf("%0".$nzeros."s",$bibid).$CopyNmbr;
  }

  function insertCopy() {
    global $copyQ, $copy;
    if (!$copyQ->insert($copy)) {
      $copyQ->close();
      if ($copyQ->getDbErrno() == "") {
        $pageErrors["barcodeNmbr"] = $copyQ->getError();
        $_SESSION["postVars"] = $_POST;
        $_SESSION["pageErrors"] = $pageErrors;
        header("Location: ../catalog/biblio_copy_new_form.php?bibid=".U($bibid));
        exit();
      } else {
        displayErrorPage($copyQ);
      }
    }
  }
?>