improvements in ReadKeyValueFromCRUDRepo

CHANGELOG.md

@@ -5,6 +5,9 @@
 * `Repos`:
     * `Cache`:
         * New transformer type: `ReadCRUDFromKeyValueRepo`
+        * New transformer type: `ReadKeyValueFromCRUDRepo`
+* `Pagination`:
+    * New `paginate` extensions with `reversed` support for `List`/`Set`
 
 ## 0.16.9
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

pagination/common/src/commonMain/kotlin/dev/inmo/micro_utils/pagination/utils/OptionallyReverse.kt

@@ -0,0 +1,29 @@
+package dev.inmo.micro_utils.pagination.utils
+
+fun <T> Iterable<T>.optionallyReverse(reverse: Boolean): Iterable<T> = when (this) {
+    is List<T> -> optionallyReverse(reverse)
+    is Set<T> -> optionallyReverse(reverse)
+    else -> if (reverse) {
+        reversed()
+    } else {
+        this
+    }
+}
+fun <T> List<T>.optionallyReverse(reverse: Boolean): List<T> = if (reverse) {
+    reversed()
+} else {
+    this
+}
+fun <T> Set<T>.optionallyReverse(reverse: Boolean): Set<T> = if (reverse) {
+    reversed().toSet()
+} else {
+    this
+}
+
+inline fun <reified T> Array<T>.optionallyReverse(reverse: Boolean) = if (reverse) {
+    Array(size) {
+        get(lastIndex - it)
+    }
+} else {
+    this
+}

pagination/common/src/commonMain/kotlin/dev/inmo/micro_utils/pagination/utils/Paginate.kt

@@ -32,6 +32,24 @@ fun <T> List<T>.paginate(with: Pagination): PaginationResult<T> {
     )
 }
 
+fun <T> List<T>.paginate(with: Pagination, reversed: Boolean): PaginationResult<T> {
+    val actualPagination = with.optionallyReverse(
+        size,
+        reversed
+    )
+
+    val firstIndex = maxOf(actualPagination.firstIndex, 0)
+    val lastIndex = minOf(actualPagination.lastIndexExclusive, size)
+    if (firstIndex > lastIndex) {
+        return emptyPaginationResult()
+    }
+
+    return subList(firstIndex, lastIndex).optionallyReverse(reversed).createPaginationResult(
+        with,
+        size.toLong()
+    )
+}
+
 fun <T> Set<T>.paginate(with: Pagination): PaginationResult<T> {
     return this.drop(with.firstIndex).take(with.size).createPaginationResult(
         with,
@@ -39,30 +57,20 @@ fun <T> Set<T>.paginate(with: Pagination): PaginationResult<T> {
     )
 }
 
-fun <T> Iterable<T>.optionallyReverse(reverse: Boolean): Iterable<T> = when (this) {
+fun <T> Set<T>.paginate(with: Pagination, reversed: Boolean): PaginationResult<T> {
-    is List<T> -> optionallyReverse(reverse)
+    val actualPagination = with.optionallyReverse(
-    is Set<T> -> optionallyReverse(reverse)
+        size,
-    else -> if (reverse) {
+        reversed
-        reversed()
+    )
-    } else {
+
-        this
+    val firstIndex = maxOf(actualPagination.firstIndex, 0)
-    }
+    val lastIndex = minOf(actualPagination.lastIndexExclusive, size)
-}
+    if (firstIndex > lastIndex) {
-fun <T> List<T>.optionallyReverse(reverse: Boolean): List<T> = if (reverse) {
+        return emptyPaginationResult()
-    reversed()
-} else {
-    this
-}
-fun <T> Set<T>.optionallyReverse(reverse: Boolean): Set<T> = if (reverse) {
-    reversed().toSet()
-} else {
-    this
     }
 
-inline fun <reified T> Array<T>.optionallyReverse(reverse: Boolean) = if (reverse) {
+    return this.drop(firstIndex).take(lastIndex - firstIndex).optionallyReverse(reversed).createPaginationResult(
-    Array(size) {
+        with,
-        get(lastIndex - it)
+        size.toLong()
-    }
+    )
-} else {
-    this
 }

repos/common/src/commonMain/kotlin/dev/inmo/micro_utils/repos/KeyValueRepo.kt

@@ -2,6 +2,8 @@ package dev.inmo.micro_utils.repos
 
 import dev.inmo.micro_utils.pagination.*
 import dev.inmo.micro_utils.pagination.utils.doAllWithCurrentPaging
+import dev.inmo.micro_utils.pagination.utils.getAllWithNextPaging
+import dev.inmo.micro_utils.pagination.utils.paginate
 import kotlinx.coroutines.flow.Flow
 
 /**
@@ -17,24 +19,32 @@ interface ReadKeyValueRepo<Key, Value> : Repo {
     suspend fun get(k: Key): Value?
 
     /**
-     * This method should use sorted by [Key]s search and take the [PaginationResult]. By default, it should use
+     * This method should use sorted by [Key]s search and return the [PaginationResult]. By default, it should use
      * ascending sort for [Key]s
      */
     suspend fun values(pagination: Pagination, reversed: Boolean = false): PaginationResult<Value>
 
     /**
-     * This method should use sorted by [Key]s search and take the [PaginationResult]. By default, it should use
+     * This method should use sorted by [Key]s search and return the [PaginationResult]. By default, it should use
      * ascending sort for [Key]s
      */
     suspend fun keys(pagination: Pagination, reversed: Boolean = false): PaginationResult<Key>
 
     /**
-     * This method should use sorted by [Key]s search and take the [PaginationResult]. By default, it should use
+     * This method should use sorted by [Key]s search and return the [PaginationResult]. By default, it should use
-     * ascending sort for [Key]s
+     * ascending sort for [Key]s.
+     *
+     * **DEFAULT REALIZATION IS NOT OPTIMAL AND HAS BEEN ADDED TO COVER CASES OF DIFFERENT COMMON MAPPINGS AND TRANSFORMATIONS**
      *
      * @param v This value should be used to exclude from search the items with different [Value]s
      */
-    suspend fun keys(v: Value, pagination: Pagination, reversed: Boolean = false): PaginationResult<Key>
+    suspend fun keys(v: Value, pagination: Pagination, reversed: Boolean = false): PaginationResult<Key> {
+        return getAllWithNextPaging {
+            keys(it)
+        }.filter {
+            get(it) == v
+        }.paginate(pagination, reversed)
+    }
 
     /**
      * @return true if [key] is presented in current collection or false otherwise

repos/common/src/commonMain/kotlin/dev/inmo/micro_utils/repos/transforms/kv/Factories.kt

@@ -2,6 +2,7 @@ package dev.inmo.micro_utils.repos.transforms.kv
 
 import dev.inmo.micro_utils.repos.KeyValueRepo
 import dev.inmo.micro_utils.repos.KeyValuesRepo
+import dev.inmo.micro_utils.repos.ReadCRUDRepo
 import dev.inmo.micro_utils.repos.ReadKeyValueRepo
 import dev.inmo.micro_utils.repos.ReadKeyValuesRepo
 import kotlin.js.JsName
@@ -10,3 +11,5 @@ import kotlin.jvm.JvmName
 fun <K, V> ReadKeyValuesRepo<K, V>.asReadKeyValueRepo() = ReadKeyValueFromKeyValuesRepo(this)
 
 fun <K, V> KeyValuesRepo<K, V>.asKeyValueRepo() = KeyValueFromKeyValuesRepo(this)
+
+fun <K, V> ReadCRUDRepo<K, V>.asReadKeyValueRepo() = ReadKeyValueFromCRUDRepo(this)

repos/common/src/commonMain/kotlin/dev/inmo/micro_utils/repos/transforms/kv/ReadKeyValueFromCRUDRepo.kt

@@ -0,0 +1,46 @@
+package dev.inmo.micro_utils.repos.transforms.kv
+
+import dev.inmo.micro_utils.pagination.FirstPagePagination
+import dev.inmo.micro_utils.pagination.Pagination
+import dev.inmo.micro_utils.pagination.PaginationResult
+import dev.inmo.micro_utils.pagination.changeResults
+import dev.inmo.micro_utils.pagination.changeResultsUnchecked
+import dev.inmo.micro_utils.pagination.utils.doForAllWithNextPaging
+import dev.inmo.micro_utils.pagination.utils.optionallyReverse
+import dev.inmo.micro_utils.pagination.utils.paginate
+import dev.inmo.micro_utils.repos.ReadCRUDRepo
+import dev.inmo.micro_utils.repos.ReadKeyValueRepo
+import dev.inmo.micro_utils.repos.ReadKeyValuesRepo
+import dev.inmo.micro_utils.repos.transforms.kvs.ReadKeyValuesFromKeyValueRepo
+import kotlin.jvm.JvmInline
+
+@JvmInline
+value class ReadKeyValueFromCRUDRepo<Key, Value>(
+    private val original: ReadCRUDRepo<Value, Key>
+) : ReadKeyValueRepo<Key, Value> {
+    override suspend fun get(k: Key): Value? = original.getById(k)
+
+    override suspend fun values(pagination: Pagination, reversed: Boolean): PaginationResult<Value> = original.getByPagination(
+        pagination.optionallyReverse(count(), reversed)
+    ).let {
+        if (reversed) {
+            it.changeResultsUnchecked(it.results.reversed())
+        } else {
+            it
+        }
+    }
+
+    override suspend fun keys(pagination: Pagination, reversed: Boolean): PaginationResult<Key> = original.getIdsByPagination(
+        pagination.optionallyReverse(count(), reversed)
+    ).let {
+        if (reversed) {
+            it.changeResultsUnchecked(it.results.reversed())
+        } else {
+            it
+        }
+    }
+
+    override suspend fun count(): Long = original.count()
+
+    override suspend fun contains(key: Key): Boolean = original.contains(key)
+}