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/*
* 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.MediatorLiveData
import androidx.lifecycle.Observer
class CombinedLiveData<T, K, S>(
source1: LiveData<T>,
source2: LiveData<K>,
private val combine: (data1: T?, data2: K?) -> S
) : MediatorLiveData<S>() {
private var data1: T? = null
private var data2: K? = null
init {
super.addSource(source1) { t ->
data1 = t
value = combine(data1, data2)
}
super.addSource(source2) { k ->
data2 = k
value = combine(data1, data2)
}
}
override fun <S : Any?> addSource(source: LiveData<S>, onChanged: Observer<in S>) {
throw UnsupportedOperationException()
}
override fun <T : Any?> removeSource(toRemote: LiveData<T>) {
throw UnsupportedOperationException()
}
}
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