java_Dbt.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:4k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: java_Dbt.c,v 11.10 2000/10/25 19:54:55 dda Exp $";
- #endif /* not lint */
- #include <jni.h>
- #include <errno.h>
- #include <stdlib.h>
- #include <string.h>
- #include "db.h"
- #include "java_util.h"
- #include "com_sleepycat_db_Dbt.h"
- JAVADB_RW_ACCESS(Dbt, jint, size, DBT, size)
- JAVADB_RW_ACCESS(Dbt, jint, ulen, DBT, ulen)
- JAVADB_RW_ACCESS(Dbt, jint, dlen, DBT, dlen)
- JAVADB_RW_ACCESS(Dbt, jint, doff, DBT, doff)
- JAVADB_RW_ACCESS(Dbt, jint, flags, DBT, flags)
- JNIEXPORT void JNICALL Java_com_sleepycat_db_Dbt_init
- (JNIEnv *jnienv, jobject jthis)
- {
- DBT_JAVAINFO *dbtji;
- dbtji = dbjit_construct();
- set_private_dbobj(jnienv, name_DBT, jthis, dbtji);
- }
- JNIEXPORT void JNICALL Java_com_sleepycat_db_Dbt_internal_1set_1data
- (JNIEnv *jnienv, jobject jthis, jbyteArray array)
- {
- DBT_JAVAINFO *db_this;
- db_this = get_DBT_JAVAINFO(jnienv, jthis);
- if (verify_non_null(jnienv, db_this)) {
- /* If we previously allocated an array for java,
- * must release reference.
- */
- dbjit_release(db_this, jnienv);
- /* Make the array a global ref,
- * it won't be GC'd till we release it.
- */
- if (array)
- array = (jbyteArray)NEW_GLOBAL_REF(jnienv, array);
- db_this->array_ = array;
- }
- }
- JNIEXPORT jbyteArray JNICALL Java_com_sleepycat_db_Dbt_get_1data
- (JNIEnv *jnienv, jobject jthis)
- {
- DBT_JAVAINFO *db_this;
- jbyteArray arr;
- int len;
- db_this = get_DBT_JAVAINFO(jnienv, jthis);
- if (verify_non_null(jnienv, db_this)) {
- /* XXX this will copy the data on each call to get_data,
- * even if it is unchanged.
- */
- if (db_this->create_array_ != 0) {
- /* XXX we should reuse the existing array if we can */
- len = db_this->dbt.size;
- if (db_this->array_ != NULL)
- DELETE_GLOBAL_REF(jnienv, db_this->array_);
- arr = (*jnienv)->NewByteArray(jnienv, len);
- db_this->array_ =
- (jbyteArray)NEW_GLOBAL_REF(jnienv, arr);
- (*jnienv)->SetByteArrayRegion(jnienv, arr, 0, len,
- db_this->dbt.data);
- }
- return (db_this->array_);
- }
- return (0);
- }
- JNIEXPORT void JNICALL Java_com_sleepycat_db_Dbt_set_1offset
- (JNIEnv *jnienv, jobject jthis, jint offset)
- {
- DBT_JAVAINFO *db_this;
- db_this = get_DBT_JAVAINFO(jnienv, jthis);
- if (verify_non_null(jnienv, db_this)) {
- db_this->offset_ = offset;
- }
- }
- JNIEXPORT jint JNICALL Java_com_sleepycat_db_Dbt_get_1offset
- (JNIEnv *jnienv, jobject jthis)
- {
- DBT_JAVAINFO *db_this;
- db_this = get_DBT_JAVAINFO(jnienv, jthis);
- if (verify_non_null(jnienv, db_this)) {
- return db_this->offset_;
- }
- return (0);
- }
- JNIEXPORT void JNICALL Java_com_sleepycat_db_Dbt_set_1recno_1key_1data(JNIEnv *jnienv, jobject jthis, jint value)
- {
- JDBT jdbt;
- if (jdbt_lock(&jdbt, jnienv, jthis, inOp) != 0)
- goto out;
- if (!jdbt.dbt->dbt.data ||
- jdbt.java_array_len_ < sizeof(db_recno_t)) {
- char buf[200];
- sprintf(buf, "set_recno_key_data error: %p %p %d %d",
- &jdbt.dbt->dbt, jdbt.dbt->dbt.data,
- jdbt.dbt->dbt.ulen, sizeof(db_recno_t));
- report_exception(jnienv, buf, 0, 0);
- }
- else {
- *(db_recno_t*)(jdbt.dbt->dbt.data) = value;
- }
- out:
- jdbt_unlock(&jdbt, jnienv);
- }
- JNIEXPORT jint JNICALL Java_com_sleepycat_db_Dbt_get_1recno_1key_1data(JNIEnv *jnienv, jobject jthis)
- {
- jint ret;
- JDBT jdbt;
- ret = 0;
- /* Although this is kind of like "retrieve", we don't support
- * DB_DBT_MALLOC for this operation, so we tell jdbt_lock
- * that is not a retrieve.
- */
- if (jdbt_lock(&jdbt, jnienv, jthis, inOp) != 0)
- goto out;
- if (!jdbt.dbt->dbt.data ||
- jdbt.java_array_len_ < sizeof(db_recno_t)) {
- char buf[200];
- sprintf(buf, "get_recno_key_data error: %p %p %d %d",
- &jdbt.dbt->dbt, jdbt.dbt->dbt.data,
- jdbt.dbt->dbt.ulen, sizeof(db_recno_t));
- report_exception(jnienv, buf, 0, 0);
- }
- else {
- ret = *(db_recno_t*)(jdbt.dbt->dbt.data);
- }
- out:
- jdbt_unlock(&jdbt, jnienv);
- return (ret);
- }
- JNIEXPORT void JNICALL Java_com_sleepycat_db_Dbt_finalize
- (JNIEnv *jnienv, jobject jthis)
- {
- DBT_JAVAINFO *dbtji;
- dbtji = get_DBT_JAVAINFO(jnienv, jthis);
- if (dbtji) {
- /* Free any data related to DBT here */
- dbjit_release(dbtji, jnienv);
- /* Extra paranoia */
- memset(dbtji, 0, sizeof(DBT_JAVAINFO));
- free(dbtji);
- }
- }