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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
package org.mozilla.focus.architecture
import androidx.lifecycle.LiveData
/**
* A LiveData implementation with an initial value and that does not allow null values.
*/
open class NonNullLiveData<T>(initialValue: T) : LiveData<T>() {
init {
value = initialValue
}
/**
* Returns the current (non-null) value. Note that calling this method on a background thread
* does not guarantee that the latest value set will be received.
*/
override fun getValue(): T = super.getValue() ?: throw IllegalStateException("Value is null")
/**
* Posts a task to a main thread to set the given (non null) value.
*/
override fun postValue(value: T?) {
if (value == null) {
throw IllegalArgumentException("Value cannot be null")
}
super.postValue(value)
}
/**
* Sets the (non-null) value. If there are active observers, the value will be dispatched to them.
*/
override fun setValue(value: T?) {
if (value == null) {
throw IllegalArgumentException("Value cannot be null")
}
super.setValue(value)
}
}