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Remove useless transformation

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Mario Danic 2019-12-18 03:34:30 +01:00
parent 4cd1b9fb18
commit c2d2787b21
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1 changed files with 0 additions and 62 deletions
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app/src/main/java/com/nextcloud/talk/newarch/utils/LiveDataTransformations.kt
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@ -1,62 +0,0 @@
package com.nextcloud.talk.newarch.utils
import android.util.Log
import androidx.annotation.MainThread
import androidx.lifecycle.LiveData
import androidx.lifecycle.MediatorLiveData
import androidx.lifecycle.Observer
import java.util.*
import kotlin.collections.ArrayList
class LiveDataTransformations {
/**
* Creates a new [LiveData] object that does not emit a value until the source LiveData
* value has been changed. The value is considered changed if `equals()` yields
* `false`.
*
* @param source the input [LiveData]
* @param <X> the generic type parameter of `source`
* @return a new [LiveData] of type `X`
</X> */
@MainThread
fun <X> distinctUntilChangedForArray(source: LiveData<X>): LiveData<X> {
val outputLiveData = MediatorLiveData<X>()
outputLiveData.addSource(source, object : Observer<X> {
var mFirstTime = true
override fun onChanged(currentValue: X?) {
val previousValue = outputLiveData.value
if (mFirstTime && currentValue != null
|| (previousValue == null && currentValue != null)) {
mFirstTime = false
outputLiveData.value = currentValue
} else if (previousValue != null) {
if (currentValue == null) {
outputLiveData.value = currentValue
} else {
val previousArray: Array<X> = (previousValue as ArrayList<X>).toArray() as Array<X>
val currentArray: Array<X> = (currentValue as ArrayList<X>).toArray() as Array<X>
if (previousArray.size != currentArray.size) {
outputLiveData.value = currentValue
} else {
var counter = 0
for(element in previousArray) {
if (!element!!.equals(currentArray[counter])) {
outputLiveData.value = currentValue
return
}
counter++
}
}
}
}
}
})
return outputLiveData
}
}