com.hp.jipp.encoding.AttributeImpl.kt Maven / Gradle / Ivy
// Copyright 2017 - 2020 HP Development Company, L.P.
// SPDX-License-Identifier: MIT
package com.hp.jipp.encoding
import com.hp.jipp.util.BuildError
/** Overridable implementation for any subclass of [Attribute]. */
open class AttributeImpl(
final override val name: String,
final override val type: AttributeType,
private val values: List
) : Attribute, List by values {
init {
if (values.isEmpty() && type !is EmptyAttributeType) {
throw BuildError("Attribute must have values or an out-of-band tag")
}
}
override fun getValue(): T? = if (values.isEmpty()) null else values[0]
override fun toString() =
when (values.size) {
0 -> "$name(${(type as EmptyAttributeType).tag.name})"
1 -> "$name=${values[0]}"
else -> "$name=$values"
}
override fun equals(other: Any?) =
if (other === this) {
true
} else when (other) {
is Attribute<*> -> {
val otherType = other.type
if (otherType is EmptyAttributeType || type is EmptyAttributeType) {
// If either is empty then they must both be empty and have the same tag
otherType is EmptyAttributeType && type is EmptyAttributeType &&
otherType.tag == type.tag
} else {
// Otherwise just make sure their names, type names, and values align
other.name == name && other.type.name == type.name && values.stringinate() == other.stringinate()
}
}
is List<*> ->
// When comparing against any other list, just compare values
values == other
else -> false
}
override fun hashCode(): Int {
// We do not consider name/tag when hashing because equals==true must also result in equal hashes
return values.stringinate().hashCode()
}
}