112 lines
3.7 KiB
Kotlin
112 lines
3.7 KiB
Kotlin
@file:Suppress("ktlint:standard:filename")
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package cash.z.ecc.android.sdk.internal.db
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import android.database.sqlite.SQLiteDatabase
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import androidx.sqlite.db.SupportSQLiteDatabase
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import androidx.sqlite.db.SupportSQLiteQueryBuilder
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import cash.z.ecc.android.sdk.internal.SdkDispatchers
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import kotlinx.coroutines.flow.flow
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import kotlinx.coroutines.flow.flowOn
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import java.util.Locale
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/**
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* Performs a query on a background thread using the dedicated [SdkDispatchers.DATABASE_IO] dispatcher.
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*
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* Note that this method is best for small queries, as Cursor has an in-memory window of cached data. If iterating
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* through a large number of items that exceeds the window, the Cursor may perform additional IO.
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*/
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@Suppress("LongParameterList")
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internal fun <T> SQLiteDatabase.queryAndMap(
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table: String,
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columns: Array<String>? = null,
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selection: String? = null,
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selectionArgs: Array<Any>? = null,
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groupBy: String? = null,
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having: String? = null,
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orderBy: String? = null,
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limit: String? = null,
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offset: String? = null,
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cursorParser: CursorParser<T>
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) = flow<T> {
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// TODO [#703]: Support blobs for argument binding
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// TODO [#703]: https://github.com/zcash/zcash-android-wallet-sdk/issues/703
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val mappedSelectionArgs =
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selectionArgs?.onEach {
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require(it !is ByteArray) {
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"ByteArray is not supported"
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}
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}?.map { it.toString() }?.toTypedArray()
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// Counterintuitive but correct. When using the comma syntax, offset comes first.
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// When using the keyword syntax, "LIMIT 1 OFFSET 2" then the offset comes second.
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val limitAndOffset =
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if (null == offset) {
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limit
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} else {
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String.format(Locale.ROOT, "%s,%s", offset, limit) // NON-NLS
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}
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query(
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table,
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columns,
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selection,
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mappedSelectionArgs,
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groupBy,
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having,
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orderBy,
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limitAndOffset
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).use {
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it.moveToPosition(-1)
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while (it.moveToNext()) {
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emit(cursorParser.newObject(it))
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}
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}
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}.flowOn(SdkDispatchers.DATABASE_IO)
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/**
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* Performs a query on a background thread using the dedicated [SdkDispatchers.DATABASE_IO] dispatcher.
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*
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* Note that this method is best for small queries, as Cursor has an in-memory window of cached data. If iterating
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* through a large number of items that exceeds the window, the Cursor may perform additional IO.
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*/
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@Suppress("LongParameterList")
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internal fun <T> SupportSQLiteDatabase.queryAndMap(
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table: String,
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columns: Array<String>? = null,
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selection: String? = null,
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selectionArgs: Array<Any>? = null,
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groupBy: String? = null,
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having: String? = null,
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orderBy: String? = null,
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limit: String? = null,
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offset: String? = null,
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cursorParser: CursorParser<T>
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) = flow<T> {
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val qb =
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SupportSQLiteQueryBuilder.builder(table).apply {
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columns(columns)
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selection(selection, selectionArgs)
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having(having)
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groupBy(groupBy)
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orderBy(orderBy)
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if (null != limit) {
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// Counterintuitive but correct. When using the comma syntax, offset comes first.
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// When using the keyword syntax, "LIMIT 1 OFFSET 2" then the offset comes second.
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if (null == offset) {
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limit(limit)
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} else {
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limit(String.format(Locale.ROOT, "%s,%s", offset, limit)) // NON-NLS
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}
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}
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}
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query(qb.create()).use {
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it.moveToPosition(-1)
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while (it.moveToNext()) {
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emit(cursorParser.newObject(it))
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}
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}
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}.flowOn(SdkDispatchers.DATABASE_IO)
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