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-rw-r--r--taler-kotlin-common/src/main/java/net/taler/common/Event.kt51
1 files changed, 0 insertions, 51 deletions
diff --git a/taler-kotlin-common/src/main/java/net/taler/common/Event.kt b/taler-kotlin-common/src/main/java/net/taler/common/Event.kt
deleted file mode 100644
index 779247f..0000000
--- a/taler-kotlin-common/src/main/java/net/taler/common/Event.kt
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is part of GNU Taler
- * (C) 2020 Taler Systems S.A.
- *
- * GNU Taler is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 3, or (at your option) any later version.
- *
- * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
- */
-
-package net.taler.common
-
-import androidx.lifecycle.LiveData
-import androidx.lifecycle.Observer
-import java.util.concurrent.atomic.AtomicBoolean
-
-/**
- * Used as a wrapper for data that is exposed via a [LiveData] that represents an one-time event.
- */
-open class Event<out T>(private val content: T) {
-
- private val isConsumed = AtomicBoolean(false)
-
- /**
- * Returns the content and prevents its use again.
- */
- fun getIfNotConsumed(): T? {
- return if (isConsumed.compareAndSet(false, true)) content else null
- }
-
-}
-
-fun <T> T.toEvent() = Event(this)
-
-/**
- * An [Observer] for [Event]s, simplifying the pattern of checking if the [Event]'s content has
- * already been consumed.
- *
- * [onEvent] is *only* called if the [Event]'s contents has not been consumed.
- */
-class EventObserver<T>(private val onEvent: (T) -> Unit) : Observer<Event<T>> {
- override fun onChanged(event: Event<T>?) {
- event?.getIfNotConsumed()?.let { onEvent(it) }
- }
-}