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Singleton implementation for Attributes.EMPTY

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This commit is contained in:
Alexander Nozik 2024-03-27 09:45:56 +03:00
parent ac851bea62
commit 48b334a2b6
2 changed files with 12 additions and 4 deletions
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12
attributes-kt/src/commonMain/kotlin/space/kscience/attributes/Attributes.kt
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@ -30,7 +30,15 @@ public interface Attributes {
override fun hashCode(): Int override fun hashCode(): Int
public companion object { public companion object {
public val EMPTY: Attributes = MapAttributes(emptyMap()) public val EMPTY: Attributes = object : Attributes {
override val content: Map<out Attribute<*>, Any?> get() = emptyMap()
override fun toString(): String = "Attributes.EMPTY"
override fun equals(other: Any?): Boolean = (other as? Attributes)?.isEmpty() ?: false
override fun hashCode(): Int = Unit.hashCode()
}
public fun equals(a1: Attributes, a2: Attributes): Boolean = public fun equals(a1: Attributes, a2: Attributes): Boolean =
a1.keys == a2.keys && a1.keys.all { a1[it] == a2[it] } a1.keys == a2.keys && a1.keys.all { a1[it] == a2[it] }
@ -43,7 +51,7 @@ internal class MapAttributes(override val content: Map<out Attribute<*>, Any?>)
override fun hashCode(): Int = content.hashCode() override fun hashCode(): Int = content.hashCode()
} }
public fun Attributes.isEmpty(): Boolean = content.isEmpty() public fun Attributes.isEmpty(): Boolean = keys.isEmpty()
/** /**
* Get attribute value or default * Get attribute value or default

4
attributes-kt/src/commonMain/kotlin/space/kscience/attributes/AttributesBuilder.kt
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@ -15,9 +15,9 @@ public class AttributesBuilder<out O> internal constructor() : Attributes {
private val map = mutableMapOf<Attribute<*>, Any?>() private val map = mutableMapOf<Attribute<*>, Any?>()
override fun toString(): String = "Attributes(value=${content.entries})" override fun toString(): String = "Attributes(value=${map.entries})"
override fun equals(other: Any?): Boolean = other is Attributes && Attributes.equals(this, other) override fun equals(other: Any?): Boolean = other is Attributes && Attributes.equals(this, other)
override fun hashCode(): Int = content.hashCode() override fun hashCode(): Int = map.hashCode()
override val content: Map<out Attribute<*>, Any?> get() = map override val content: Map<out Attribute<*>, Any?> get() = map