com.hp.jipp.encoding.AttributeGroupImpl.kt Maven / Gradle / Ivy
// Copyright 2017 HP Development Company, L.P.
// SPDX-License-Identifier: MIT
package com.hp.jipp.encoding
/**
* An implementation of [AttributeGroup].
*/
class AttributeGroupImpl(
override val tag: DelimiterTag,
attributes: List>
) : AttributeGroup, List> by attributes.handleDuplicates() {
private val attributes = toList()
/** Return the attribute corresponding to the specified [name]. */
override operator fun get(name: String): Attribute<*>? = firstOrNull { it.name == name }
/** Return the attribute as conforming to the supplied attribute type. */
override operator fun get(type: AttributeType): Attribute? =
get(type.name)?.let {
type.coerce(it)
}
override fun equals(other: Any?) =
when {
other === this -> true
other is AttributeGroup -> other.tag == tag && attributes == other
other is List<*> -> attributes == other
else -> false
}
override fun hashCode(): Int {
// Note: tag is not included because we might need to hash this with other List objects
return attributes.hashCode()
}
override fun toString(): String {
return "AttributeGroup($tag, $attributes)"
}
companion object {
/**
* Return a list of attributes with the last value of a duplicate, if present.
*
* Note: As per RFC8011: The attributes within a group MUST be unique; if an attribute with
* the same name occurs more than once, the group is malformed (see [RFC8011] section 4.1.3).
*/
@JvmStatic
fun List>.handleDuplicates(): List> {
return groupBy { it.name }.values.map { it.last() }
}
}
}