commonMain.implementations.persistentOrderedMap.PersistentOrderedMapContentViews.kt Maven / Gradle / Ivy

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Kotlin Immutable Collections multiplatform library

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/*
 * Copyright 2016-2019 JetBrains s.r.o.
 * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
 */

package kotlinx.collections.immutable.implementations.persistentOrderedMap

import kotlinx.collections.immutable.ImmutableCollection
import kotlinx.collections.immutable.ImmutableSet

internal class PersistentOrderedMapEntries(private val map: PersistentOrderedMap) : ImmutableSet>, AbstractSet>() {
    override val size: Int get() = map.size

    override fun contains(element: Map.Entry): Boolean {
        // TODO: Eliminate this check after KT-30016 gets fixed.
        if ((element as Any?) !is Map.Entry<*, *>) return false
        return map[element.key]?.let { candidate -> candidate == element.value }
                ?: (element.value == null && map.containsKey(element.key))
    }

    override fun iterator(): Iterator> {
        return PersistentOrderedMapEntriesIterator(map)
    }
}

internal class PersistentOrderedMapKeys(private val map: PersistentOrderedMap) : ImmutableSet, AbstractSet() {
    override val size: Int
        get() = map.size

    override fun contains(element: K): Boolean {
        return map.containsKey(element)
    }

    override fun iterator(): Iterator {
        return PersistentOrderedMapKeysIterator(map)
    }
}

internal class PersistentOrderedMapValues(private val map: PersistentOrderedMap) : ImmutableCollection, AbstractCollection() {
    override val size: Int
        get() = map.size

    override fun contains(element: V): Boolean {
        return map.containsValue(element)
    }

    override fun iterator(): Iterator {
        return PersistentOrderedMapValuesIterator(map)
    }
}