| <html devsite="true"> |
| <head> |
| <title>PositionalDataSource</title> |
| {% setvar book_path %}/reference/kotlin/androidx/_book.yaml{% endsetvar %} |
| {% include "_shared/_reference-head-tags.html" %} |
| </head> |
| <body> |
| <h1>PositionalDataSource</h1> |
| {% setvar page_path %}androidx/paging/PositionalDataSource.html{% endsetvar %} |
| {% setvar can_switch %}1{% endsetvar %} |
| {% include "reference/_kotlin_switcher2.md" %} |
| <p> |
| <pre>abstract class PositionalDataSource<T : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> : <a href="/reference/kotlin/androidx/paging/DataSource.html">DataSource</a></pre> |
| </p> |
| <div class="devsite-table-wrapper"> |
| <table class="jd-inheritance-table"> |
| <tbody> |
| <tr> |
| <td colspan="3"><a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a></td> |
| </tr> |
| <tr> |
| <td class="jd-inheritance-space"> ↳</td> |
| <td colspan="2"><a href="/reference/kotlin/androidx/paging/DataSource.html">DataSource</a></td> |
| </tr> |
| <tr> |
| <td> </td> |
| <td class="jd-inheritance-space"> ↳</td> |
| <td colspan="1"><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <hr> |
| <aside class="caution"><strong>This class is deprecated.</strong><br>PositionalDataSource is deprecated and has been replaced by PagingSource</aside> |
| <p>Position-based data loader for a fixed-size, countable data set, supporting fixed-size loads at arbitrary page positions.</p> |
| <p>Extend PositionalDataSource if you can load pages of a requested size at arbitrary positions, and provide a fixed item count. If your data source can't support loading arbitrary requested page sizes (e.g. when network page size constraints are only known at runtime), either use <code><a href="/reference/kotlin/androidx/paging/PageKeyedDataSource.html">PageKeyedDataSource</a></code> or <code><a href="/reference/kotlin/androidx/paging/ItemKeyedDataSource.html">ItemKeyedDataSource</a></code>, or pass the initial result with the two parameter <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialCallback.html#onResult(kotlin.collections.List,kotlin.Int,kotlin.Int)">LoadInitialCallback.onResult</a></code>.</p> |
| <p>Room can generate a Factory of PositionalDataSources for you:</p> |
| <pre class="prettyprint">@Dao<br>interface UserDao {<br> @Query("SELECT * FROM user ORDER BY age DESC")<br> public abstract DataSource.Factory<Integer, User> loadUsersByAgeDesc();<br>}</pre> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Parameters</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><T : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>></code></td> |
| <td width="100%"> |
| <p>Type of items being loaded by the <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a></code>.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <h2>Summary</h2> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2"><h3>Nested types</h3></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.Companion.html">PositionalDataSource.Companion</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialCallback.html">PositionalDataSource.LoadInitialCallback</a></code></td> |
| <td width="100%"> |
| <p>Callback for <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadInitial(androidx.paging.PositionalDataSource.LoadInitialParams)">loadInitial</a></code> to return data, position, and count.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialParams.html">PositionalDataSource.LoadInitialParams</a></code></td> |
| <td width="100%"> |
| <p>Holder object for inputs to <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadInitial(androidx.paging.PositionalDataSource.LoadInitialParams)">loadInitial</a></code>.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadRangeCallback.html">PositionalDataSource.LoadRangeCallback</a></code></td> |
| <td width="100%"> |
| <p>Callback for PositionalDataSource <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadRange(androidx.paging.PositionalDataSource.LoadRangeParams)">loadRange</a></code> to return data.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadRangeParams.html">PositionalDataSource.LoadRangeParams</a></code></td> |
| <td width="100%"> |
| <p>Holder object for inputs to <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadRange(androidx.paging.PositionalDataSource.LoadRangeParams)">loadRange</a></code>.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2"><h3>Public properties</h3></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>open <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html">Boolean</a></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#isInvalid()">isInvalid</a></code></div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2"><h3>Public constructors</h3></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td> |
| <div><code><T : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#PositionalDataSource()">PositionalDataSource</a>()</code></div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2"><h3>Public functions</h3></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>abstract @<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html">Unit</a></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadInitial(androidx.paging.PositionalDataSource.LoadInitialParams,androidx.paging.PositionalDataSource.LoadInitialCallback)">loadInitial</a>(<br> params: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialParams.html">PositionalDataSource.LoadInitialParams</a>,<br> callback: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialCallback.html">PositionalDataSource.LoadInitialCallback</a><T><br>)</code></div> |
| <p>Load initial list data.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>abstract @<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html">Unit</a></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadRange(androidx.paging.PositionalDataSource.LoadRangeParams,androidx.paging.PositionalDataSource.LoadRangeCallback)">loadRange</a>(<br> params: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadRangeParams.html">PositionalDataSource.LoadRangeParams</a>,<br> callback: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadRangeCallback.html">PositionalDataSource.LoadRangeCallback</a><T><br>)</code></div> |
| <p>Called to load a range of data from the DataSource.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>final <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></code></td> |
| <td width="100%"> |
| <div><code><V : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#map()">map</a>(function: <a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><T, V>)</code></div> |
| <p>Applies the given function to each value emitted by the DataSource.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>final <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></code></td> |
| <td width="100%"> |
| <div><code><V : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#map(kotlin.Function1)">map</a>(function: (T) -> V)</code></div> |
| <p>Applies the given function to each value emitted by the DataSource.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>final <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></code></td> |
| <td width="100%"> |
| <div><code><V : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#mapByPage()">mapByPage</a>(function: <a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><T>, <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><V>>)</code></div> |
| <p>Applies the given function to each value emitted by the DataSource.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>final <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></code></td> |
| <td width="100%"> |
| <div><code><V : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#mapByPage(kotlin.Function1)">mapByPage</a>(function: (<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><T>) -> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><V>)</code></div> |
| <p>Applies the given function to each value emitted by the DataSource.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive" id="inhmethods"> |
| <thead> |
| <tr> |
| <th colspan="2"><h3>Inherited functions</h3></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><devsite-expandable><span class="expand-control">From class <a href="/reference/kotlin/androidx/paging/DataSource.html">DataSource</a></span> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <tbody> |
| <tr> |
| <td><code>open @<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html">Unit</a></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/kotlin/androidx/paging/DataSource.html#addInvalidatedCallback(androidx.paging.DataSource.InvalidatedCallback)">addInvalidatedCallback</a>(<br> onInvalidatedCallback: <a href="/reference/kotlin/androidx/paging/DataSource.InvalidatedCallback.html">DataSource.InvalidatedCallback</a><br>)</code></div> |
| <p>Add a callback to invoke when the DataSource is first invalidated.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>open @<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html">Unit</a></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/kotlin/androidx/paging/DataSource.html#invalidate()">invalidate</a>()</code></div> |
| <p>Signal the data source to stop loading, and notify its callback.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>open @<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html">Unit</a></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/kotlin/androidx/paging/DataSource.html#removeInvalidatedCallback(androidx.paging.DataSource.InvalidatedCallback)">removeInvalidatedCallback</a>(<br> onInvalidatedCallback: <a href="/reference/kotlin/androidx/paging/DataSource.InvalidatedCallback.html">DataSource.InvalidatedCallback</a><br>)</code></div> |
| <p>Remove a previously added invalidate callback.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </devsite-expandable> </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <h2>Public properties</h2> |
| <div><a name="getIsInvalid()"></a><a name="setIsInvalid()"></a><a name="getIsInvalid--"></a><a name="setIsInvalid--"></a> |
| <h3 class="api-name" id="isInvalid()">isInvalid</h3> |
| <pre class="api-signature no-pretty-print">open val <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#isInvalid()">isInvalid</a>: <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html">Boolean</a></pre> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Returns</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html">Boolean</a></code></td> |
| <td width="100%"> |
| <p><code>true</code> if the data source is invalid, and can no longer be queried for data.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <h2>Public constructors</h2> |
| <div><a name="PositionalDataSource--"></a> |
| <h3 class="api-name" id="PositionalDataSource()">PositionalDataSource</h3> |
| <pre class="api-signature no-pretty-print"><T : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#PositionalDataSource()">PositionalDataSource</a>()</pre> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Parameters</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><T : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>></code></td> |
| <td width="100%"> |
| <p>Type of items being loaded by the <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a></code>.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <h2>Public functions</h2> |
| <div><a name="loadInitial(androidx.paging.PositionalDataSource.LoadInitialParams, androidx.paging.PositionalDataSource.LoadInitialCallback)"></a><a name="loadInitial-androidx.paging.PositionalDataSource.LoadInitialParams-androidx.paging.PositionalDataSource.LoadInitialCallback-"></a> |
| <h3 class="api-name" id="loadInitial(androidx.paging.PositionalDataSource.LoadInitialParams,androidx.paging.PositionalDataSource.LoadInitialCallback)">loadInitial</h3> |
| <pre class="api-signature no-pretty-print">@<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><br>abstract fun <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadInitial(androidx.paging.PositionalDataSource.LoadInitialParams,androidx.paging.PositionalDataSource.LoadInitialCallback)">loadInitial</a>(<br> params: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialParams.html">PositionalDataSource.LoadInitialParams</a>,<br> callback: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialCallback.html">PositionalDataSource.LoadInitialCallback</a><T><br>): @<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html">Unit</a></pre> |
| <p>Load initial list data.</p> |
| <p>This method is called to load the initial page(s) from the <code><a href="/reference/kotlin/androidx/paging/DataSource.html">DataSource</a></code>.</p> |
| <p>LoadResult list must be a multiple of pageSize to enable efficient tiling.</p> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Parameters</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>params: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialParams.html">PositionalDataSource.LoadInitialParams</a></code></td> |
| <td width="100%"> |
| <p>Parameters for initial load, including requested start position, load size, and page size.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>callback: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialCallback.html">PositionalDataSource.LoadInitialCallback</a><T></code></td> |
| <td width="100%"> |
| <p>Callback that receives initial load data, including position and total data set size.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div><a name="loadRange(androidx.paging.PositionalDataSource.LoadRangeParams, androidx.paging.PositionalDataSource.LoadRangeCallback)"></a><a name="loadRange-androidx.paging.PositionalDataSource.LoadRangeParams-androidx.paging.PositionalDataSource.LoadRangeCallback-"></a> |
| <h3 class="api-name" id="loadRange(androidx.paging.PositionalDataSource.LoadRangeParams,androidx.paging.PositionalDataSource.LoadRangeCallback)">loadRange</h3> |
| <pre class="api-signature no-pretty-print">@<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><br>abstract fun <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadRange(androidx.paging.PositionalDataSource.LoadRangeParams,androidx.paging.PositionalDataSource.LoadRangeCallback)">loadRange</a>(<br> params: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadRangeParams.html">PositionalDataSource.LoadRangeParams</a>,<br> callback: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadRangeCallback.html">PositionalDataSource.LoadRangeCallback</a><T><br>): @<a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html">Unit</a></pre> |
| <p>Called to load a range of data from the DataSource.</p> |
| <p>This method is called to load additional pages from the DataSource after the <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadInitialCallback.html">LoadInitialCallback</a></code> passed to dispatchLoadInitial has initialized a <code><a href="/reference/kotlin/androidx/paging/PagedList.html">PagedList</a></code>.</p> |
| <p>Unlike <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#loadInitial(androidx.paging.PositionalDataSource.LoadInitialParams)">loadInitial</a></code>, this method must return the number of items requested, at the position requested.</p> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Parameters</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>params: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadRangeParams.html">PositionalDataSource.LoadRangeParams</a></code></td> |
| <td width="100%"> |
| <p>Parameters for load, including start position and load size.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>callback: <a href="/reference/kotlin/androidx/paging/PositionalDataSource.LoadRangeCallback.html">PositionalDataSource.LoadRangeCallback</a><T></code></td> |
| <td width="100%"> |
| <p>Callback that receives loaded data.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div><a name="map--"></a> |
| <h3 class="api-name" id="map()">map</h3> |
| <pre class="api-signature no-pretty-print">final fun <V : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#map()">map</a>(function: <a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><T, V>): <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></pre> |
| <p>Applies the given function to each value emitted by the DataSource.</p> |
| <p>Same as <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#mapByPage()">mapByPage</a></code>, but operates on individual items.</p> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Returns</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></code></td> |
| <td width="100%"> |
| <p>A new DataSource, which transforms items using the given function.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Parameters</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>function: <a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><T, V></code></td> |
| <td width="100%"> |
| <p>Function that runs on each loaded item, returning items of a potentially new type.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">See also</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#mapByPage()">mapByPage</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/DataSource.Factory.html#map()">map</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/DataSource.Factory.html#mapByPage()">mapByPage</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div><a name="map-kotlin.Function1-"></a> |
| <h3 class="api-name" id="map(kotlin.Function1)">map</h3> |
| <pre class="api-signature no-pretty-print">final fun <V : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#map(kotlin.Function1)">map</a>(function: (T) -> V): <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></pre> |
| <p>Applies the given function to each value emitted by the DataSource.</p> |
| <p>Same as <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#mapByPage()">mapByPage</a></code>, but operates on individual items.</p> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Returns</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></code></td> |
| <td width="100%"> |
| <p>A new DataSource, which transforms items using the given function.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Parameters</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>function: (T) -> V</code></td> |
| <td width="100%"> |
| <p>Function that runs on each loaded item, returning items of a potentially new type.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">See also</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#mapByPage()">mapByPage</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/DataSource.Factory.html#map()">map</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/DataSource.Factory.html#mapByPage()">mapByPage</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div><a name="mapByPage--"></a> |
| <h3 class="api-name" id="mapByPage()">mapByPage</h3> |
| <pre class="api-signature no-pretty-print">final fun <V : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#mapByPage()">mapByPage</a>(function: <a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><T>, <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><V>>): <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></pre> |
| <p>Applies the given function to each value emitted by the DataSource.</p> |
| <p>Same as <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#map()">map</a></code>, but allows for batch conversions.</p> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Returns</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></code></td> |
| <td width="100%"> |
| <p>A new DataSource, which transforms items using the given function.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Parameters</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>function: <a href="/reference/kotlin/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><T>, <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><V>></code></td> |
| <td width="100%"> |
| <p>Function that runs on each loaded page, returning items of a potentially new type.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">See also</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#map()">map</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/DataSource.Factory.html#map()">map</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/DataSource.Factory.html#mapByPage()">mapByPage</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div><a name="mapByPage-kotlin.Function1-"></a> |
| <h3 class="api-name" id="mapByPage(kotlin.Function1)">mapByPage</h3> |
| <pre class="api-signature no-pretty-print">final fun <V : <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</a>> <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#mapByPage(kotlin.Function1)">mapByPage</a>(function: (<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><T>) -> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><V>): <a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></pre> |
| <p>Applies the given function to each value emitted by the DataSource.</p> |
| <p>Same as <code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#map()">map</a></code>, but allows for batch conversions.</p> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Returns</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html">PositionalDataSource</a><V></code></td> |
| <td width="100%"> |
| <p>A new DataSource, which transforms items using the given function.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">Parameters</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>function: (<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><T>) -> <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html">List</a><V></code></td> |
| <td width="100%"> |
| <p>Function that runs on each loaded page, returning items of a potentially new type.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">See also</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/PositionalDataSource.html#map()">map</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/DataSource.Factory.html#map()">map</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| <tr> |
| <td><code><a href="/reference/kotlin/androidx/paging/DataSource.Factory.html#mapByPage()">mapByPage</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| </body> |
| </html> |
