Struct StaticFileCursor

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pub struct StaticFileCursor<'a>(/* private fields */);

Expand description

Cursor of a static file segment.

Implementations§

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impl<'a> StaticFileCursor<'a>

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pub fn new( jar: &'a NippyJar<SegmentHeader>, reader: Arc<DataReader>, ) -> ProviderResult<Self>

Returns a new StaticFileCursor.

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pub fn number(&self) -> Option<u64>

Returns the current BlockNumber or TxNumber of the cursor depending on the kind of static file segment.

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pub fn get( &mut self, key_or_num: KeyOrNumber<'_>, mask: usize, ) -> ProviderResult<Option<Vec<&[u8]>>>

Gets a row of values.

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pub fn get_one<M: ColumnSelectorOne>( &mut self, key_or_num: KeyOrNumber<'_>, ) -> ProviderResult<Option<M::FIRST>>

Gets one column value from a row.

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pub fn get_two<M: ColumnSelectorTwo>( &mut self, key_or_num: KeyOrNumber<'_>, ) -> ProviderResult<Option<(M::FIRST, M::SECOND)>>

Gets two column values from a row.

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pub fn get_three<M: ColumnSelectorThree>( &mut self, key_or_num: KeyOrNumber<'_>, ) -> ProviderResult<Option<(M::FIRST, M::SECOND, M::THIRD)>>

Gets three column values from a row.

Methods from Deref<Target = NippyJarCursor<'a, SegmentHeader>>§

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pub fn jar(&self) -> &NippyJar<H>

Returns a reference to the related NippyJar

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pub fn row_index(&self) -> u64

Returns current row index of the cursor

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pub fn reset(&mut self)

Resets cursor to the beginning.

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pub fn row_by_number( &mut self, row: usize, ) -> Result<Option<Vec<&[u8]>>, NippyJarError>

Returns a row by its number.

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pub fn next_row(&mut self) -> Result<Option<Vec<&[u8]>>, NippyJarError>

Returns the current value and advances the row.

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pub fn row_by_number_with_cols( &mut self, row: usize, mask: usize, ) -> Result<Option<Vec<&[u8]>>, NippyJarError>

Returns a row by its number by using a mask to only read certain columns from the row.

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pub fn next_row_with_cols( &mut self, mask: usize, ) -> Result<Option<Vec<&[u8]>>, NippyJarError>

Returns the current value and advances the row.

Uses a mask to only read certain columns from the row.

Trait Implementations§

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impl<'a> Debug for StaticFileCursor<'a>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl<'a> Deref for StaticFileCursor<'a>

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type Target = NippyJarCursor<'a, SegmentHeader>

The resulting type after dereferencing.

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fn deref(&self) -> &Self::Target

Dereferences the value.

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impl<'a> DerefMut for StaticFileCursor<'a>

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

Auto Trait Implementations§

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impl<'a> UnwindSafe for StaticFileCursor<'a>

Blanket Implementations§

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impl<T> Any for T
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Gets the TypeId of self. Read more

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Causes self to use its LowerExp implementation when Debug-formatted.

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Causes self to use its LowerHex implementation when Debug-formatted.

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