com.hp.jipp.encoding.AttributeGroupImpl.kt Maven / Gradle / Ivy

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IPP packet builder/parser

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// Copyright 2017 HP Development Company, L.P.
// SPDX-License-Identifier: MIT

package com.hp.jipp.encoding

import com.hp.jipp.util.BuildError
import java.util.HashSet

/**
 * An implementation of [AttributeGroup].
 */
internal class AttributeGroupImpl(
    override val tag: DelimiterTag,
    private val attributes: List>
) : AttributeGroup, List> by attributes {

    init {
        // RFC2910: Within an attribute group, if two or more attributes have the same name, the attribute group
        // is malformed (see [RFC2911] section 3.1.3). Throw if someone attempts this.
        val names = HashSet()
        for (attribute in attributes) {
            val name = attribute.name
            if (names.contains(name)) {
                throw BuildError("Attribute Group contains more than one '$name` in $attributes")
            }
            names.add(name)
        }
    }

    /** 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)"
    }
}