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Sourcecode: db4.1 version File versions

java_Db.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2002
 *    Sleepycat Software.  All rights reserved.
 */
#include "db_config.h"

#ifndef lint
static const char revid[] = "$Id: java_Db.c,v 11.80 2002/08/29 14:22:23 margo Exp $";
#endif /* not lint */

#include <jni.h>
#include <stdlib.h>
#include <string.h>

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/btree.h"
#include "dbinc_auto/db_ext.h"
#include "java_util.h"
#include "java_stat_auto.h"
#include "com_sleepycat_db_Db.h"

/* This struct is used in Db.verify and its callback */
struct verify_callback_struct {
      JNIEnv *env;
      jobject streamobj;
      jbyteArray bytes;
      int nbytes;
      jmethodID writemid;
};

JAVADB_GET_FLD(Db, jint, flags_1raw, DB, flags)

JAVADB_SET_METH(Db, jint, flags, DB, flags)
JAVADB_SET_METH(Db, jint, h_1ffactor, DB, h_ffactor)
JAVADB_SET_METH(Db, jint, h_1nelem, DB, h_nelem)
JAVADB_SET_METH(Db, jint, lorder, DB, lorder)
JAVADB_SET_METH(Db, jint, re_1delim, DB, re_delim)
JAVADB_SET_METH(Db, jint, re_1len, DB, re_len)
JAVADB_SET_METH(Db, jint, re_1pad, DB, re_pad)
JAVADB_SET_METH(Db, jint, q_1extentsize, DB, q_extentsize)
JAVADB_SET_METH(Db, jint, bt_1maxkey, DB, bt_maxkey)
JAVADB_SET_METH(Db, jint, bt_1minkey, DB, bt_minkey)

/*
 * This only gets called once ever, at the beginning of execution
 * and can be used to initialize unchanging methodIds, fieldIds, etc.
 */
JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_one_1time_1init
  (JNIEnv *jnienv,  /*Db.class*/ jclass jthisclass)
{
      COMPQUIET(jthisclass, NULL);

      one_time_init(jnienv);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db__1init
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbEnv*/ jobject jdbenv, jint flags)
{
      int err;
      DB *db;
      DB_JAVAINFO *dbinfo;
      DB_ENV *dbenv;

      dbenv = get_DB_ENV(jnienv, jdbenv);
      dbinfo = get_DB_JAVAINFO(jnienv, jthis);
      DB_ASSERT(dbinfo == NULL);

      err = db_create(&db, dbenv, flags);
      if (verify_return(jnienv, err, 0)) {
            set_private_dbobj(jnienv, name_DB, jthis, db);
            dbinfo = dbji_construct(jnienv, jthis, flags);
            set_private_info(jnienv, name_DB, jthis, dbinfo);
            db->api_internal = dbinfo;
      }
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db__1associate
    (JNIEnv *jnienv, /*Db*/ jobject jthis, /* DbTxn */ jobject jtxn,
     /*Db*/ jobject jsecondary, /*DbSecondaryKeyCreate*/ jobject jcallback,
     jint flags)
{
      DB *db, *secondary;
      DB_JAVAINFO *second_info;
      DB_TXN *txn;

      db = get_DB(jnienv, jthis);
      txn = get_DB_TXN(jnienv, jtxn);
      secondary = get_DB(jnienv, jsecondary);

      second_info = (DB_JAVAINFO*)secondary->api_internal;
      dbji_set_assoc_object(second_info, jnienv, db, txn, secondary,
                        jcallback, flags);

}

JNIEXPORT jint JNICALL Java_com_sleepycat_db_Db__1close
  (JNIEnv *jnienv, /*Db*/ jobject jthis, jint flags)
{
      int err;
      DB *db;
      DB_JAVAINFO *dbinfo;

      db = get_DB(jnienv, jthis);
      dbinfo = get_DB_JAVAINFO(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return (0);

      /*
       * Null out the private data to indicate the DB is invalid.
       * We do this in advance to help guard against multithreading
       * issues.
       */
      set_private_dbobj(jnienv, name_DB, jthis, 0);

      err = db->close(db, flags);
      verify_return(jnienv, err, 0);
      dbji_dealloc(dbinfo, jnienv);

      return (err);
}

/*
 * We are being notified that the parent DbEnv has closed.
 * Zero out the pointer to the DB, since it is no longer
 * valid, to prevent mistakes.  The user will get a null
 * pointer exception if they try to use this Db again.
 */
JNIEXPORT void JNICALL Java_com_sleepycat_db_Db__1notify_1internal
  (JNIEnv *jnienv, /*Db*/ jobject jthis)
{
      set_private_dbobj(jnienv, name_DB, jthis, 0);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_append_1recno_1changed
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbAppendRecno*/ jobject jcallback)
{
      DB *db;
      DB_JAVAINFO *dbinfo;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;

      dbinfo = (DB_JAVAINFO*)db->api_internal;
      dbji_set_append_recno_object(dbinfo, jnienv, db, jcallback);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_bt_1compare_1changed
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbBtreeCompare*/ jobject jbtcompare)
{
      DB *db;
      DB_JAVAINFO *dbinfo;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;

      dbinfo = (DB_JAVAINFO*)db->api_internal;
      dbji_set_bt_compare_object(dbinfo, jnienv, db, jbtcompare);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_bt_1prefix_1changed
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbBtreePrefix*/ jobject jbtprefix)
{
      DB *db;
      DB_JAVAINFO *dbinfo;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;

      dbinfo = (DB_JAVAINFO*)db->api_internal;
      dbji_set_bt_prefix_object(dbinfo, jnienv, db, jbtprefix);
}

JNIEXPORT jobject JNICALL Java_com_sleepycat_db_Db_cursor
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbTxn*/ jobject txnid, jint flags)
{
      int err;
      DBC *dbc;
      DB *db = get_DB(jnienv, jthis);
      DB_TXN *dbtxnid = get_DB_TXN(jnienv, txnid);

      if (!verify_non_null(jnienv, db))
            return (NULL);
      err = db->cursor(db, dbtxnid, &dbc, flags);
      verify_return(jnienv, err, 0);
      return (get_Dbc(jnienv, dbc));
}

JNIEXPORT jint JNICALL Java_com_sleepycat_db_Db_del
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbTxn*/ jobject txnid,
   /*Dbt*/ jobject key, jint dbflags)
{
      int err;
      DB_TXN *dbtxnid;
      DB *db;
      LOCKED_DBT lkey;

      err = 0;
      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return (0);

      dbtxnid = get_DB_TXN(jnienv, txnid);
      if (locked_dbt_get(&lkey, jnienv, db->dbenv, key, inOp) != 0)
            goto out;

      err = db->del(db, dbtxnid, &lkey.javainfo->dbt, dbflags);
      if (!DB_RETOK_DBDEL(err))
            verify_return(jnienv, err, 0);

 out:
      locked_dbt_put(&lkey, jnienv, db->dbenv);
      return (err);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_dup_1compare_1changed
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbDupCompare*/ jobject jdupcompare)
{
      DB *db;
      DB_JAVAINFO *dbinfo;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;

      dbinfo = (DB_JAVAINFO*)db->api_internal;
      dbji_set_dup_compare_object(dbinfo, jnienv, db, jdupcompare);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_err
  (JNIEnv *jnienv, /*Db*/ jobject jthis, jint ecode, jstring msg)
{
      DB *db;
      LOCKED_STRING ls_msg;

      if (locked_string_get(&ls_msg, jnienv, msg) != 0)
            goto out;
      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            goto out;

      db->err(db, ecode, "%s", ls_msg.string);

 out:
      locked_string_put(&ls_msg, jnienv);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_errx
  (JNIEnv *jnienv, /*Db*/ jobject jthis, jstring msg)
{
      LOCKED_STRING ls_msg;
      DB *db = get_DB(jnienv, jthis);

      if (locked_string_get(&ls_msg, jnienv, msg) != 0)
            goto out;
      if (!verify_non_null(jnienv, db))
            goto out;

      db->errx(db, "%s", ls_msg.string);

 out:
      locked_string_put(&ls_msg, jnienv);
}

JNIEXPORT jint JNICALL Java_com_sleepycat_db_Db_fd
  (JNIEnv *jnienv, /*Db*/ jobject jthis)
{
      int err;
      int return_value = 0;
      DB *db = get_DB(jnienv, jthis);

      if (!verify_non_null(jnienv, db))
            return (0);

      err = db->fd(db, &return_value);
      verify_return(jnienv, err, 0);

      return (return_value);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_set_1encrypt
  (JNIEnv *jnienv, /*Db*/ jobject jthis, jstring jpasswd, jint flags)
{
      int err;
      DB *db;
      LOCKED_STRING ls_passwd;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;
      if (locked_string_get(&ls_passwd, jnienv, jpasswd) != 0)
            goto out;

      err = db->set_encrypt(db, ls_passwd.string, flags);
      verify_return(jnienv, err, 0);

out:  locked_string_put(&ls_passwd, jnienv);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_feedback_1changed
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbFeedback*/ jobject jfeedback)
{
      DB *db;
      DB_JAVAINFO *dbinfo;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;

      dbinfo = (DB_JAVAINFO*)db->api_internal;
      dbji_set_feedback_object(dbinfo, jnienv, db, jfeedback);
}

JNIEXPORT jint JNICALL Java_com_sleepycat_db_Db_get
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbTxn*/ jobject txnid,
   /*Dbt*/ jobject key, /*Dbt*/ jobject data, jint flags)
{
      int err, op_flags, retry;
      DB *db;
      DB_ENV *dbenv;
      OpKind keyop, dataop;
      DB_TXN *dbtxnid;
      LOCKED_DBT lkey, ldata;

      err = 0;
      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            goto out3;
      dbenv = db->dbenv;

      /* Depending on flags, the key may be input/output. */
      keyop = inOp;
      dataop = outOp;
      op_flags = flags & DB_OPFLAGS_MASK;
      if (op_flags == DB_SET_RECNO) {
            keyop = inOutOp;
      }
      else if (op_flags == DB_GET_BOTH) {
            keyop = inOutOp;
            dataop = inOutOp;
      }

      dbtxnid = get_DB_TXN(jnienv, txnid);

      if (locked_dbt_get(&lkey, jnienv, dbenv, key, keyop) != 0)
            goto out2;
      if (locked_dbt_get(&ldata, jnienv, dbenv, data, dataop) != 0)
            goto out1;
      for (retry = 0; retry < 3; retry++) {
            err = db->get(db,
                dbtxnid, &lkey.javainfo->dbt, &ldata.javainfo->dbt, flags);

            /*
             * If we failed due to lack of memory in our DBT arrays,
             * retry.
             */
            if (err != ENOMEM)
                  break;
            if (!locked_dbt_realloc(&lkey, jnienv, dbenv) &&
                !locked_dbt_realloc(&ldata, jnienv, dbenv))
                  break;
      }
 out1:
      locked_dbt_put(&ldata, jnienv, dbenv);
 out2:
      locked_dbt_put(&lkey, jnienv, dbenv);
 out3:
      if (!DB_RETOK_DBGET(err)) {
            if (verify_dbt(jnienv, err, &lkey) &&
                verify_dbt(jnienv, err, &ldata))
                  verify_return(jnienv, err, 0);
      }
      return (err);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_hash_1changed
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbHash*/ jobject jhash)
{
      DB *db;
      DB_JAVAINFO *dbinfo;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;

      dbinfo = (DB_JAVAINFO*)db->api_internal;
      dbji_set_h_hash_object(dbinfo, jnienv, db, jhash);
}

JNIEXPORT jobject JNICALL Java_com_sleepycat_db_Db_join
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*Dbc[]*/ jobjectArray curslist,
   jint flags)
{
      int err;
      DB *db;
      int count;
      DBC **newlist;
      DBC *dbc;
      int i;
      int size;

      db = get_DB(jnienv, jthis);
      count = (*jnienv)->GetArrayLength(jnienv, curslist);
      size = sizeof(DBC *) * (count+1);
      if ((err = __os_malloc(db->dbenv, size, &newlist)) != 0) {
            if (!verify_return(jnienv, err, 0))
                  return (NULL);
      }

      /* Convert the java array of Dbc's to a C array of DBC's. */
      for (i = 0; i < count; i++) {
            jobject jobj =
                (*jnienv)->GetObjectArrayElement(jnienv, curslist, i);
            if (jobj == 0) {
                  /*
                   * An embedded null in the array is treated
                   * as an endpoint.
                   */
                  newlist[i] = 0;
                  break;
            }
            else {
                  newlist[i] = get_DBC(jnienv, jobj);
            }
      }
      newlist[count] = 0;

      if (!verify_non_null(jnienv, db))
            return (NULL);

      err = db->join(db, newlist, &dbc, flags);
      verify_return(jnienv, err, 0);
      __os_free(db->dbenv, newlist);

      return (get_Dbc(jnienv, dbc));
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_key_1range
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbTxn*/ jobject txnid,
   /*Dbt*/ jobject jkey, jobject /*DbKeyRange*/ range, jint flags)
{
      int err;
      DB *db;
      DB_TXN *dbtxnid;
      LOCKED_DBT lkey;
      DB_KEY_RANGE result;
      jfieldID fid;
      jclass krclass;

      db = get_DB(jnienv, jthis);
      dbtxnid = get_DB_TXN(jnienv, txnid);
      if (!verify_non_null(jnienv, db))
            return;
      if (!verify_non_null(jnienv, range))
            return;
      if (locked_dbt_get(&lkey, jnienv, db->dbenv, jkey, inOp) != 0)
            goto out;
      err = db->key_range(db, dbtxnid, &lkey.javainfo->dbt, &result, flags);
      if (verify_return(jnienv, err, 0)) {
            /* fill in the values of the DbKeyRange structure */
            if ((krclass = get_class(jnienv, "DbKeyRange")) == NULL)
                  return;     /* An exception has been posted. */
            fid = (*jnienv)->GetFieldID(jnienv, krclass, "less", "D");
            (*jnienv)->SetDoubleField(jnienv, range, fid, result.less);
            fid = (*jnienv)->GetFieldID(jnienv, krclass, "equal", "D");
            (*jnienv)->SetDoubleField(jnienv, range, fid, result.equal);
            fid = (*jnienv)->GetFieldID(jnienv, krclass, "greater", "D");
            (*jnienv)->SetDoubleField(jnienv, range, fid, result.greater);
      }
 out:
      locked_dbt_put(&lkey, jnienv, db->dbenv);
}

JNIEXPORT jint JNICALL Java_com_sleepycat_db_Db_pget
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbTxn*/ jobject txnid,
   /*Dbt*/ jobject key, /*Dbt*/ jobject rkey, /*Dbt*/ jobject data, jint flags)
{
      int err, op_flags, retry;
      DB *db;
      DB_ENV *dbenv;
      OpKind keyop, rkeyop, dataop;
      DB_TXN *dbtxnid;
      LOCKED_DBT lkey, lrkey, ldata;

      err = 0;
      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            goto out4;
      dbenv = db->dbenv;

      /* Depending on flags, the key may be input/output. */
      keyop = inOp;
      rkeyop = outOp;
      dataop = outOp;
      op_flags = flags & DB_OPFLAGS_MASK;
      if (op_flags == DB_SET_RECNO) {
            keyop = inOutOp;
      }
      else if (op_flags == DB_GET_BOTH) {
            keyop = inOutOp;
            rkeyop = inOutOp;
            dataop = inOutOp;
      }

      dbtxnid = get_DB_TXN(jnienv, txnid);

      if (locked_dbt_get(&lkey, jnienv, dbenv, key, keyop) != 0)
            goto out3;
      if (locked_dbt_get(&lrkey, jnienv, dbenv, rkey, rkeyop) != 0)
            goto out2;
      if (locked_dbt_get(&ldata, jnienv, dbenv, data, dataop) != 0)
            goto out1;
      for (retry = 0; retry < 3; retry++) {
            err = db->pget(db, dbtxnid, &lkey.javainfo->dbt,
                &lrkey.javainfo->dbt, &ldata.javainfo->dbt, flags);

            /*
             * If we failed due to lack of memory in our DBT arrays,
             * retry.
             */
            if (err != ENOMEM)
                  break;
            if (!locked_dbt_realloc(&lkey, jnienv, dbenv) &&
                !locked_dbt_realloc(&lrkey, jnienv, dbenv) &&
                !locked_dbt_realloc(&ldata, jnienv, dbenv))
                  break;
      }
 out1:
      locked_dbt_put(&ldata, jnienv, dbenv);
 out2:
      locked_dbt_put(&lrkey, jnienv, dbenv);
 out3:
      locked_dbt_put(&lkey, jnienv, dbenv);
 out4:
      if (!DB_RETOK_DBGET(err)) {
            if (verify_dbt(jnienv, err, &lkey) &&
                verify_dbt(jnienv, err, &lrkey) &&
                verify_dbt(jnienv, err, &ldata))
                  verify_return(jnienv, err, 0);
      }
      return (err);
}

JNIEXPORT jint JNICALL Java_com_sleepycat_db_Db_put
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbTxn*/ jobject txnid,
   /*Dbt*/ jobject key, /*Dbt*/ jobject data, jint flags)
{
      int err;
      DB *db;
      DB_ENV *dbenv;
      DB_TXN *dbtxnid;
      LOCKED_DBT lkey, ldata;
      OpKind keyop;

      err = 0;
      db = get_DB(jnienv, jthis);
      dbtxnid = get_DB_TXN(jnienv, txnid);
      if (!verify_non_null(jnienv, db))
            return (0);   /* error will be thrown, retval doesn't matter */
      dbenv = db->dbenv;

      /*
       * For DB_APPEND, the key may be output-only;  for all other flags,
       * it's input-only.
       */
      if ((flags & DB_OPFLAGS_MASK) == DB_APPEND)
            keyop = outOp;
      else
            keyop = inOp;

      if (locked_dbt_get(&lkey, jnienv, dbenv, key, keyop) != 0)
            goto out2;
      if (locked_dbt_get(&ldata, jnienv, dbenv, data, inOp) != 0)
            goto out1;

      if (!verify_non_null(jnienv, db))
            goto out1;

      err = db->put(db,
          dbtxnid, &lkey.javainfo->dbt, &ldata.javainfo->dbt, flags);
      if (!DB_RETOK_DBPUT(err))
            verify_return(jnienv, err, 0);

 out1:
      locked_dbt_put(&ldata, jnienv, dbenv);
 out2:
      locked_dbt_put(&lkey, jnienv, dbenv);
      return (err);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db__1remove
  (JNIEnv *jnienv, /*Db*/ jobject jthis,
   jstring file, jstring database, jint flags)
{
      int err;
      DB *db;
      DB_JAVAINFO *dbinfo;
      LOCKED_STRING ls_file;
      LOCKED_STRING ls_database;

      db = get_DB(jnienv, jthis);
      dbinfo = get_DB_JAVAINFO(jnienv, jthis);

      if (!verify_non_null(jnienv, db))
            return;
      if (locked_string_get(&ls_file, jnienv, file) != 0)
            goto out2;
      if (locked_string_get(&ls_database, jnienv, database) != 0)
            goto out1;
      err = db->remove(db, ls_file.string, ls_database.string, flags);

      set_private_dbobj(jnienv, name_DB, jthis, 0);
      verify_return(jnienv, err, EXCEPTION_FILE_NOT_FOUND);

 out1:
      locked_string_put(&ls_database, jnienv);
 out2:
      locked_string_put(&ls_file, jnienv);

      dbji_dealloc(dbinfo, jnienv);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db__1rename
  (JNIEnv *jnienv, /*Db*/ jobject jthis,
   jstring file, jstring database, jstring newname, jint flags)
{
      int err;
      DB *db;
      DB_JAVAINFO *dbinfo;
      LOCKED_STRING ls_file;
      LOCKED_STRING ls_database;
      LOCKED_STRING ls_newname;

      db = get_DB(jnienv, jthis);
      dbinfo = get_DB_JAVAINFO(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;
      if (locked_string_get(&ls_file, jnienv, file) != 0)
            goto out3;
      if (locked_string_get(&ls_database, jnienv, database) != 0)
            goto out2;
      if (locked_string_get(&ls_newname, jnienv, newname) != 0)
            goto out1;

      err = db->rename(db, ls_file.string, ls_database.string,
                   ls_newname.string, flags);

      verify_return(jnienv, err, EXCEPTION_FILE_NOT_FOUND);
      set_private_dbobj(jnienv, name_DB, jthis, 0);

 out1:
      locked_string_put(&ls_newname, jnienv);
 out2:
      locked_string_put(&ls_database, jnienv);
 out3:
      locked_string_put(&ls_file, jnienv);

      dbji_dealloc(dbinfo, jnienv);
}

JAVADB_METHOD(Db_set_1pagesize, (JAVADB_ARGS, jlong pagesize), DB,
    set_pagesize, (c_this, (u_int32_t)pagesize))
JAVADB_METHOD(Db_set_1cachesize,
    (JAVADB_ARGS, jint gbytes, jint bytes, jint ncaches), DB,
    set_cachesize, (c_this, gbytes, bytes, ncaches))
JAVADB_METHOD(Db_set_1cache_1priority, (JAVADB_ARGS, jint priority), DB,
    set_cache_priority, (c_this, (DB_CACHE_PRIORITY)priority))

JNIEXPORT void JNICALL
  Java_com_sleepycat_db_Db_set_1re_1source
  (JNIEnv *jnienv, /*Db*/ jobject jthis, jstring re_source)
{
      int err;
      DB *db;

      db = get_DB(jnienv, jthis);
      if (verify_non_null(jnienv, db)) {

            /* XXX does the string from get_c_string ever get freed? */
            if (re_source != NULL)
                  err = db->set_re_source(db,
                      get_c_string(jnienv, re_source));
            else
                  err = db->set_re_source(db, 0);

            verify_return(jnienv, err, 0);
      }
}

JNIEXPORT jobject JNICALL Java_com_sleepycat_db_Db_stat
  (JNIEnv *jnienv, jobject jthis, jint flags)
{
      DB *db;
      DB_BTREE_STAT *bstp;
      DB_HASH_STAT *hstp;
      DB_QUEUE_STAT *qstp;
      DBTYPE dbtype;
      jobject retval;
      jclass dbclass;
      size_t bytesize;
      void *statp;

      bytesize = 0;
      retval = NULL;
      statp = NULL;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return (NULL);

      if (verify_return(jnienv, db->stat(db, &statp, flags), 0) &&
          verify_return(jnienv, db->get_type(db, &dbtype), 0)) {
            switch (dbtype) {
                  /* Btree and recno share the same stat structure */
            case DB_BTREE:
            case DB_RECNO:
                  bstp = (DB_BTREE_STAT *)statp;
                  bytesize = sizeof(DB_BTREE_STAT);
                  retval = create_default_object(jnienv,
                                           name_DB_BTREE_STAT);
                  if ((dbclass =
                      get_class(jnienv, name_DB_BTREE_STAT)) == NULL)
                        break;      /* An exception has been posted. */

                  __jv_fill_bt_stat(jnienv, dbclass, retval, bstp);
                  break;

                  /* Hash stat structure */
            case DB_HASH:
                  hstp = (DB_HASH_STAT *)statp;
                  bytesize = sizeof(DB_HASH_STAT);
                  retval = create_default_object(jnienv,
                                           name_DB_HASH_STAT);
                  if ((dbclass =
                      get_class(jnienv, name_DB_HASH_STAT)) == NULL)
                        break;      /* An exception has been posted. */

                  __jv_fill_h_stat(jnienv, dbclass, retval, hstp);
                  break;

            case DB_QUEUE:
                  qstp = (DB_QUEUE_STAT *)statp;
                  bytesize = sizeof(DB_QUEUE_STAT);
                  retval = create_default_object(jnienv,
                                           name_DB_QUEUE_STAT);
                  if ((dbclass =
                      get_class(jnienv, name_DB_QUEUE_STAT)) == NULL)
                        break;      /* An exception has been posted. */

                  __jv_fill_qam_stat(jnienv, dbclass, retval, qstp);
                  break;

                  /* That's all the database types we're aware of! */
            default:
                  report_exception(jnienv,
                               "Db.stat not implemented for types"
                               " other than BTREE, HASH, QUEUE,"
                               " and RECNO",
                               EINVAL, 0);
                  break;
            }
            if (bytesize != 0)
                  __os_ufree(db->dbenv, statp);
      }
      return (retval);
}

JAVADB_METHOD(Db_sync, (JAVADB_ARGS, jint flags), DB,
    sync, (c_this, flags))

JNIEXPORT jboolean JNICALL Java_com_sleepycat_db_Db_get_1byteswapped
  (JNIEnv *jnienv, /*Db*/ jobject jthis)
{
      DB *db;
      int err, isbyteswapped;

      /* This value should never be seen, because of the exception. */
      isbyteswapped = 0;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return (0);

      err = db->get_byteswapped(db, &isbyteswapped);
      (void)verify_return(jnienv, err, 0);

      return ((jboolean)isbyteswapped);
}

JNIEXPORT jint JNICALL Java_com_sleepycat_db_Db_get_1type
  (JNIEnv *jnienv, /*Db*/ jobject jthis)
{
      DB *db;
      int err;
      DBTYPE dbtype;

      /* This value should never be seen, because of the exception. */
      dbtype = DB_UNKNOWN;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return (0);

      err = db->get_type(db, &dbtype);
      (void)verify_return(jnienv, err, 0);

      return ((jint)dbtype);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db__1open
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbTxn*/ jobject txnid,
   jstring file, jstring database, jint type, jint flags, jint mode)
{
      int err;
      DB *db;
      DB_TXN *dbtxnid;
      LOCKED_STRING ls_file;
      LOCKED_STRING ls_database;

      /* Java is assumed to be threaded */
      flags |= DB_THREAD;

      db = get_DB(jnienv, jthis);

      dbtxnid = get_DB_TXN(jnienv, txnid);
      if (locked_string_get(&ls_file, jnienv, file) != 0)
            goto out2;
      if (locked_string_get(&ls_database, jnienv, database) != 0)
            goto out1;
      if (verify_non_null(jnienv, db)) {
            err = db->open(db, dbtxnid, ls_file.string, ls_database.string,
                         (DBTYPE)type, flags, mode);
            verify_return(jnienv, err, EXCEPTION_FILE_NOT_FOUND);
      }
 out1:
      locked_string_put(&ls_database, jnienv);
 out2:
      locked_string_put(&ls_file, jnienv);
}

JNIEXPORT jint JNICALL Java_com_sleepycat_db_Db_truncate
  (JNIEnv *jnienv, /*Db*/ jobject jthis, /*DbTxn*/ jobject jtxnid, jint flags)
{
      int err;
      DB *db;
      u_int32_t count;
      DB_TXN *dbtxnid;

      db = get_DB(jnienv, jthis);
      dbtxnid = get_DB_TXN(jnienv, jtxnid);
      count = 0;
      if (verify_non_null(jnienv, db)) {
            err = db->truncate(db, dbtxnid, &count, flags);
            verify_return(jnienv, err, 0);
      }
      return (jint)count;
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_upgrade
  (JNIEnv *jnienv, /*Db*/ jobject jthis, jstring name,
   jint flags)
{
      int err;
      DB *db = get_DB(jnienv, jthis);
      LOCKED_STRING ls_name;

      if (verify_non_null(jnienv, db)) {
            if (locked_string_get(&ls_name, jnienv, name) != 0)
                  goto out;
            err = db->upgrade(db, ls_name.string, flags);
            verify_return(jnienv, err, 0);
      }
 out:
      locked_string_put(&ls_name, jnienv);
}

static int java_verify_callback(void *handle, const void *str_arg)
{
      char *str;
      struct verify_callback_struct *vc;
      int len;
      JNIEnv *jnienv;

      str = (char *)str_arg;
      vc = (struct verify_callback_struct *)handle;
      jnienv = vc->env;
      len = strlen(str)+1;
      if (len > vc->nbytes) {
            vc->nbytes = len;
            vc->bytes = (*jnienv)->NewByteArray(jnienv, len);
      }

      if (vc->bytes != NULL) {
            (*jnienv)->SetByteArrayRegion(jnienv, vc->bytes, 0, len,
                (jbyte*)str);
            (*jnienv)->CallVoidMethod(jnienv, vc->streamobj,
                vc->writemid, vc->bytes, 0, len-1);
      }

      if ((*jnienv)->ExceptionOccurred(jnienv) != NULL)
            return (EIO);

      return (0);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db_verify
  (JNIEnv *jnienv, /*Db*/ jobject jthis, jstring name,
   jstring subdb, jobject stream, jint flags)
{
      int err;
      DB *db;
      LOCKED_STRING ls_name;
      LOCKED_STRING ls_subdb;
      struct verify_callback_struct vcs;
      jclass streamclass;

      db = get_DB(jnienv, jthis);
      if (!verify_non_null(jnienv, db))
            return;
      if (locked_string_get(&ls_name, jnienv, name) != 0)
            goto out2;
      if (locked_string_get(&ls_subdb, jnienv, subdb) != 0)
            goto out1;

      /* set up everything we need for the callbacks */
      vcs.env = jnienv;
      vcs.streamobj = stream;
      vcs.nbytes = 100;
      if ((vcs.bytes = (*jnienv)->NewByteArray(jnienv, vcs.nbytes)) == NULL)
            goto out1;

      /* get the method ID for OutputStream.write(byte[], int, int); */
      streamclass = (*jnienv)->FindClass(jnienv, "java/io/OutputStream");
      vcs.writemid = (*jnienv)->GetMethodID(jnienv, streamclass,
                                    "write", "([BII)V");

      /* invoke verify - this will invoke the callback repeatedly. */
      err = __db_verify_internal(db, ls_name.string, ls_subdb.string,
                           &vcs, java_verify_callback, flags);
      verify_return(jnienv, err, 0);

out1:
      locked_string_put(&ls_subdb, jnienv);
out2:
      locked_string_put(&ls_name, jnienv);
}

JNIEXPORT void JNICALL Java_com_sleepycat_db_Db__1finalize
    (JNIEnv *jnienv, jobject jthis,
     jobject /*DbErrcall*/ errcall, jstring errpfx)
{
      DB_JAVAINFO *dbinfo;
      DB *db;

      dbinfo = get_DB_JAVAINFO(jnienv, jthis);
      db = get_DB(jnienv, jthis);
      DB_ASSERT(dbinfo != NULL);

      /*
       * Note: We can never be sure if the underlying DB is attached to
       * a DB_ENV that was already closed.  Sure, that's a user error,
       * but it shouldn't crash the VM.  Therefore, we cannot just
       * automatically close if the handle indicates we are not yet
       * closed.  The best we can do is detect this and report it.
       */
      if (db != NULL) {
            /* If this error occurs, this object was never closed. */
            report_errcall(jnienv, errcall, errpfx,
                         "Db.finalize: open Db object destroyed");
      }

      /* Shouldn't see this object again, but just in case */
      set_private_dbobj(jnienv, name_DB, jthis, 0);
      set_private_info(jnienv, name_DB, jthis, 0);

      dbji_destroy(dbinfo, jnienv);
}

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