forked from upstream-mirrors/quik
Moez Bhatti
90 lines
2.3 KiB
Kotlin
90 lines
2.3 KiB
Kotlin
/*
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* Copyright (C) 2017 Moez Bhatti <moez.bhatti@gmail.com>
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*
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* This file is part of QKSMS.
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*
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* QKSMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* QKSMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with QKSMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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package util.extensions
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import android.database.Cursor
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import io.reactivex.Flowable
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import io.reactivex.Maybe
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import io.reactivex.subjects.MaybeSubject
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fun Cursor.forEach(closeOnComplete: Boolean = true, method: (Cursor) -> Unit = {}) {
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moveToPosition(-1)
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while (moveToNext()) {
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method.invoke(this)
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}
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if (closeOnComplete) {
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close()
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}
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}
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fun <T> Cursor.map(map: (Cursor) -> T): List<T> {
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return List(count, { position ->
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moveToPosition(position)
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map(this)
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})
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}
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fun <T> Cursor.mapWhile(map: (Cursor) -> T, predicate: (T) -> Boolean): ArrayList<T> {
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val result = ArrayList<T>()
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moveToPosition(-1)
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while (moveToNext()) {
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val item = map(this)
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if (!predicate(item)) break
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result.add(item)
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}
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return result
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}
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/**
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* We're using this simple implementation with .range() because of the
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* complexities of dealing with Backpressure with a Cursor. We can't simply
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* use a loop and call onNext() from a generator because we'll need to close
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* the cursor at the end, and if any items are still in the buffer, then
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* they will be made invalid
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*/
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fun Cursor.asFlowable(): Flowable<Cursor> {
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return Flowable.range(0, count)
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.map {
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moveToPosition(it)
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this
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}
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.doOnComplete { close() }
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}
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fun Cursor.asMaybe(): Maybe<Cursor> {
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val subject = MaybeSubject.create<Cursor>()
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if (moveToFirst()) {
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subject.onSuccess(this)
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} else {
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subject.onError(IndexOutOfBoundsException("The cursor has no items"))
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}
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subject.doOnComplete { close() }
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return subject
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}
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