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193 lines (157 loc) 路 4.77 KB
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use std::ptr::NonNull;
use std::slice::from_raw_parts;
use std::str::from_utf8;
use std::sync::Arc;
use libsqlite3_sys::{
sqlite3_value, sqlite3_value_blob, sqlite3_value_bytes, sqlite3_value_double,
sqlite3_value_dup, sqlite3_value_free, sqlite3_value_int, sqlite3_value_int64,
sqlite3_value_type, SQLITE_NULL,
};
use crate::error::BoxDynError;
use crate::sqlite::type_info::DataType;
use crate::sqlite::{Sqlite, SqliteTypeInfo};
use crate::value::{Value, ValueRef};
use std::borrow::Cow;
enum SqliteValueData<'r> {
Value(&'r SqliteValue),
}
pub struct SqliteValueRef<'r>(SqliteValueData<'r>);
impl<'r> SqliteValueRef<'r> {
pub(crate) fn value(value: &'r SqliteValue) -> Self {
Self(SqliteValueData::Value(value))
}
pub(super) fn int(&self) -> i32 {
match self.0 {
SqliteValueData::Value(v) => v.int(),
}
}
pub(super) fn int64(&self) -> i64 {
match self.0 {
SqliteValueData::Value(v) => v.int64(),
}
}
pub(super) fn double(&self) -> f64 {
match self.0 {
SqliteValueData::Value(v) => v.double(),
}
}
pub(super) fn blob(&self) -> &'r [u8] {
match self.0 {
SqliteValueData::Value(v) => v.blob(),
}
}
pub(super) fn text(&self) -> Result<&'r str, BoxDynError> {
match self.0 {
SqliteValueData::Value(v) => v.text(),
}
}
}
impl<'r> ValueRef<'r> for SqliteValueRef<'r> {
type Database = Sqlite;
fn to_owned(&self) -> SqliteValue {
match self.0 {
SqliteValueData::Value(v) => v.clone(),
}
}
fn type_info(&self) -> Cow<'_, SqliteTypeInfo> {
match self.0 {
SqliteValueData::Value(v) => v.type_info(),
}
}
fn is_null(&self) -> bool {
match self.0 {
SqliteValueData::Value(v) => v.is_null(),
}
}
}
#[derive(Clone)]
pub struct SqliteValue {
pub(crate) handle: Arc<ValueHandle>,
pub(crate) type_info: SqliteTypeInfo,
}
pub(crate) struct ValueHandle(NonNull<sqlite3_value>);
// SAFE: only protected value objects are stored in SqliteValue
unsafe impl Send for ValueHandle {}
unsafe impl Sync for ValueHandle {}
impl SqliteValue {
pub(crate) unsafe fn new(value: *mut sqlite3_value, type_info: SqliteTypeInfo) -> Self {
debug_assert!(!value.is_null());
Self {
type_info,
handle: Arc::new(ValueHandle(NonNull::new_unchecked(sqlite3_value_dup(
value,
)))),
}
}
fn type_info_opt(&self) -> Option<SqliteTypeInfo> {
let dt = DataType::from_code(unsafe { sqlite3_value_type(self.handle.0.as_ptr()) });
if let DataType::Null = dt {
None
} else {
Some(SqliteTypeInfo(dt))
}
}
fn int(&self) -> i32 {
unsafe { sqlite3_value_int(self.handle.0.as_ptr()) }
}
fn int64(&self) -> i64 {
unsafe { sqlite3_value_int64(self.handle.0.as_ptr()) }
}
fn double(&self) -> f64 {
unsafe { sqlite3_value_double(self.handle.0.as_ptr()) }
}
fn blob(&self) -> &[u8] {
let len = unsafe { sqlite3_value_bytes(self.handle.0.as_ptr()) } as usize;
if len == 0 {
// empty blobs are NULL so just return an empty slice
return &[];
}
let ptr = unsafe { sqlite3_value_blob(self.handle.0.as_ptr()) } as *const u8;
debug_assert!(!ptr.is_null());
unsafe { from_raw_parts(ptr, len) }
}
fn text(&self) -> Result<&str, BoxDynError> {
Ok(from_utf8(self.blob())?)
}
}
impl Value for SqliteValue {
type Database = Sqlite;
fn as_ref(&self) -> SqliteValueRef<'_> {
SqliteValueRef::value(self)
}
fn type_info(&self) -> Cow<'_, SqliteTypeInfo> {
self.type_info_opt()
.map(Cow::Owned)
.unwrap_or(Cow::Borrowed(&self.type_info))
}
fn is_null(&self) -> bool {
unsafe { sqlite3_value_type(self.handle.0.as_ptr()) == SQLITE_NULL }
}
}
impl Drop for ValueHandle {
fn drop(&mut self) {
unsafe {
sqlite3_value_free(self.0.as_ptr());
}
}
}
#[cfg(feature = "any")]
impl<'r> From<SqliteValueRef<'r>> for crate::any::AnyValueRef<'r> {
#[inline]
fn from(value: SqliteValueRef<'r>) -> Self {
crate::any::AnyValueRef {
type_info: value.type_info().into_owned().into(),
kind: crate::any::value::AnyValueRefKind::Sqlite(value),
}
}
}
#[cfg(feature = "any")]
impl From<SqliteValue> for crate::any::AnyValue {
#[inline]
fn from(value: SqliteValue) -> Self {
crate::any::AnyValue {
type_info: value.type_info().clone().into_owned().into(),
kind: crate::any::value::AnyValueKind::Sqlite(value),
}
}
}