Code review
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@ -235,35 +235,26 @@ class SpaceOrderTest {
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Assert.assertEquals("roomId6", reOrdered[5].first)
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}
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@Test
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fun testComparator() {
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listOf(
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"roomId2" to "a",
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"roomId1" to "b",
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"roomId3" to null,
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"roomId4" to null,
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).assertSpaceOrdered()
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}
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private fun reOrderWithCommands(orderedSpaces: List<Pair<String, String?>>, orderCommand: List<SpaceOrderUtils.SpaceReOrderCommand>) =
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orderedSpaces.map { orderInfo ->
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orderInfo.first to (orderCommand.find { it.spaceId == orderInfo.first }?.order ?: orderInfo.second)
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}
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.sortedWith(TestSpaceComparator())
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.sortedWith(testSpaceComparator)
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private fun List<Pair<String, String?>>.assertSpaceOrdered() : List<Pair<String, String?>> {
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assertEquals(this, this.sortedWith(TestSpaceComparator()))
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private fun List<Pair<String, String?>>.assertSpaceOrdered(): List<Pair<String, String?>> {
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assertEquals(this, this.sortedWith(testSpaceComparator))
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return this
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}
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class TestSpaceComparator : Comparator<Pair<String, String?>> {
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override fun compare(left: Pair<String, String?>?, right: Pair<String, String?>?): Int {
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val leftOrder = left?.second
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val rightOrder = right?.second
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return if (leftOrder != null && rightOrder != null) {
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leftOrder.compareTo(rightOrder)
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} else {
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if (leftOrder == null) {
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if (rightOrder == null) {
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compareValues(left?.first, right?.first)
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} else {
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1
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}
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} else {
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-1
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}
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}
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}
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}
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private val testSpaceComparator = compareBy<Pair<String, String?>, String?>(nullsLast()) { it.second }.thenBy { it.first }
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}
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@ -18,6 +18,16 @@ package org.matrix.android.sdk.api.session.space
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import org.matrix.android.sdk.api.util.StringOrderUtils
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/**
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* Adds some utilities to compute correct string orders when ordering spaces.
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* After moving a space (e.g via DnD), client should limit the number of room account data update.
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* For example if the space is moved between two other spaces with orders, just update the moved space order by computing
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* a mid point between the surrounding orders.
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* If the space is moved after a space with no order, all the previous spaces should be then ordered,
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* and the computed orders should be chosen so that there is enough gaps in between them to facilitate future re-order.
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* Re numbering (i.e change all spaces m.space.order account data) should be avoided as much as possible,
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* as the updates might not be atomic for other clients and would makes spaces jump around.
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*/
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object SpaceOrderUtils {
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data class SpaceReOrderCommand(
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@ -25,6 +35,9 @@ object SpaceOrderUtils {
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val order: String
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)
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/**
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* Returns a minimal list of order change in order to re order the space list as per given move.
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*/
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fun orderCommandsForMove(orderedSpacesToOrderMap: List<Pair<String, String?>>, movedSpaceId: String, delta: Int): List<SpaceReOrderCommand> {
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val movedIndex = orderedSpacesToOrderMap.indexOfFirst { it.first == movedSpaceId }
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if (movedIndex == -1) return emptyList()
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@ -34,8 +47,6 @@ object SpaceOrderUtils {
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val nodesToReNumber = mutableListOf<String>()
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var lowerBondOrder: String? = null
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var afterSpace: Pair<String, String?>? = null
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// if (delta > 0) {
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var index = targetIndex
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while (index >= 0 && lowerBondOrder == null) {
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val node = orderedSpacesToOrderMap.getOrNull(index)
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@ -51,7 +62,9 @@ object SpaceOrderUtils {
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index--
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}
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nodesToReNumber.add(movedSpaceId)
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afterSpace = if (orderedSpacesToOrderMap.indices.contains(targetIndex + 1)) orderedSpacesToOrderMap[targetIndex + 1] else null
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val afterSpace: Pair<String, String?>? = if (orderedSpacesToOrderMap.indices.contains(targetIndex + 1)) {
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orderedSpacesToOrderMap[targetIndex + 1]
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} else null
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val defaultMaxOrder = CharArray(4) { StringOrderUtils.DEFAULT_ALPHABET.last() }
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.joinToString("")
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@ -81,10 +94,10 @@ object SpaceOrderUtils {
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}
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} ?: emptyList()
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} else {
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return nodesToReNumber.mapIndexed { index, s ->
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return nodesToReNumber.mapIndexed { i, s ->
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SpaceReOrderCommand(
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s,
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newOrder[index]
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newOrder[i]
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)
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}
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}
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@ -366,7 +366,6 @@ dependencies {
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implementation "com.jakewharton.rxbinding3:rxbinding-appcompat:$rxbinding_version"
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implementation "com.jakewharton.rxbinding3:rxbinding-material:$rxbinding_version"
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// implementation fileTree(include: ['*.jar', '*.aar'], dir: 'libs')
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implementation("com.airbnb.android:epoxy:$epoxy_version")
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implementation "com.airbnb.android:epoxy-glide-preloading:$epoxy_version"
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kapt "com.airbnb.android:epoxy-processor:$epoxy_version"
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