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/*
* Copyright (c) 2017-present Robert Jaros
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package pl.treksoft.kvision.state
/**
* Observable set interface.
*/
interface ObservableSet<T> : MutableSet<T>, ObservableState<Set<T>> {
val onUpdate: MutableCollection<(MutableSet<T>) -> Unit>
}
/**
* Simple observable set implementation.
*/
class ObservableSetWrapper<T>(val mutableSet: MutableSet<T> = mutableSetOf()) : MutableSet<T>, ObservableSet<T>,
ObservableState<Set<T>> {
override fun getState(): Set<T> {
return this
}
override fun subscribe(observer: (Set<T>) -> Unit): () -> Unit {
onUpdate += observer
observer(this)
return {
onUpdate -= observer
}
}
override val onUpdate: MutableCollection<(MutableSet<T>) -> Unit> = mutableListOf()
override val size: Int
get() = mutableSet.size
override fun contains(element: T): Boolean {
return mutableSet.contains(element)
}
override fun containsAll(elements: Collection<T>): Boolean {
return mutableSet.containsAll(elements)
}
override fun isEmpty(): Boolean {
return mutableSet.isEmpty()
}
override fun iterator(): MutableIterator<T> = object : MutableIterator<T> {
val inner = mutableSet.iterator()
override fun hasNext(): Boolean = inner.hasNext()
override fun next(): T = inner.next()
override fun remove() {
inner.remove()
onUpdate.forEach { it(this@ObservableSetWrapper) }
}
}
override fun add(element: T): Boolean {
val result = mutableSet.add(element)
if (result) {
onUpdate.forEach { it(this) }
}
return result
}
override fun addAll(elements: Collection<T>): Boolean {
val result = mutableSet.addAll(elements)
if (result) {
onUpdate.forEach { it(this) }
}
return result
}
override fun clear() {
mutableSet.clear()
onUpdate.forEach { it(this) }
}
override fun remove(element: T): Boolean {
val result = mutableSet.remove(element)
if (result) {
onUpdate.forEach { it(this) }
}
return result
}
override fun removeAll(elements: Collection<T>): Boolean {
val result = mutableSet.removeAll(elements)
if (result) {
onUpdate.forEach { it(this) }
}
return result
}
override fun retainAll(elements: Collection<T>): Boolean {
val result = mutableSet.retainAll(elements)
if (result) {
onUpdate.forEach { it(this) }
}
return result
}
}
/**
* Creates an instance of ObservableSet<T>
*/
fun <T> observableSetOf(vararg items: T): ObservableSet<T> = ObservableSetWrapper(items.toMutableSet())
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