commonMain.jetbrains.datalore.base.observable.collections.CollectionItemEvent.kt Maven / Gradle / Ivy

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/*
 * Copyright (c) 2020. JetBrains s.r.o.
 * Use of this source code is governed by the MIT license that can be found in the LICENSE file.
 */

package jetbrains.datalore.base.observable.collections

import jetbrains.datalore.base.observable.event.ListenerEvent

class CollectionItemEvent(
        val oldItem: ItemT?,
        val newItem: ItemT?,
        val index: Int,
        val type: EventType
) :
        ListenerEvent> {

    init {
        if (EventType.ADD == type && oldItem != null || EventType.REMOVE == type && newItem != null) {
            throw IllegalStateException()
        }
    }

    override fun dispatch(l: CollectionListener) {
        if (EventType.ADD == type) {
            l.onItemAdded(this)
        } else if (EventType.SET == type) {
            l.onItemSet(this)
        } else {
            l.onItemRemoved(this)
        }
    }

    override fun toString(): String {
        return if (EventType.ADD == type) {
            newItem.toString() + " added at " + index
        } else if (EventType.SET == type) {
            oldItem.toString() + " replaced with " + newItem + " at " + index
        } else {
            oldItem.toString() + " removed at " + index
        }
    }

    override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (other == null || this::class != other::class) return false

        other as CollectionItemEvent<*>

        if (oldItem != other.oldItem) return false
        if (newItem != other.newItem) return false
        if (index != other.index) return false
        if (type != other.type) return false

        return true
    }

    override fun hashCode(): Int {
        var result = oldItem?.hashCode() ?: 0
        result = 31 * result + (newItem?.hashCode() ?: 0)
        result = 31 * result + index
        result = 31 * result + type.hashCode()
        return result
    }

    enum class EventType {
        ADD, SET, REMOVE
    }

}