com.hp.jipp.encoding.Codec.kt Maven / Gradle / Ivy
// Copyright 2017 HP Development Company, L.P.
// SPDX-License-Identifier: MIT
package com.hp.jipp.encoding
/** Reads/writes values of [T]. */
interface Codec {
val cls: Class
/** Return true if this codec handles the specified tag. */
fun handlesTag(tag: ValueTag): Boolean
/** Read a value from the input stream */
fun readValue(input: IppInputStream, startTag: ValueTag): T
/** Write value (assuming it is an instance of [T]). */
fun writeValue(output: IppOutputStream, value: Any)
/** The tag to use for a particular value. */
fun tagOf(value: Any): ValueTag
companion object {
/** Construct a codec handling [TaggedValue] values, covering any number of [ValueTag] input values. */
inline operator fun invoke(
crossinline handlesTagFunc: (ValueTag) -> Boolean,
crossinline readAttrFunc: IppInputStream.(startTag: ValueTag) -> T,
crossinline writeAttrFunc: IppOutputStream.(value: T) -> Unit
) =
object : Codec {
override val cls: Class = T::class.java
override fun tagOf(value: Any) = (value as T).tag
override fun handlesTag(tag: ValueTag) = handlesTagFunc(tag)
override fun readValue(input: IppInputStream, startTag: ValueTag): T =
input.readAttrFunc(startTag)
override fun writeValue(output: IppOutputStream, value: Any) {
output.writeAttrFunc(value as T)
}
}
/** Construct a codec handling values encoded by a particular [ValueTag]. */
inline operator fun invoke(
valueTag: ValueTag,
crossinline readAttrFunc: IppInputStream.(startTag: ValueTag) -> T,
crossinline writeAttrFunc: IppOutputStream.(value: T) -> Unit
) =
object : Codec {
override val cls: Class = T::class.java
override fun tagOf(value: Any) = valueTag
override fun handlesTag(tag: ValueTag) = valueTag == tag
override fun readValue(input: IppInputStream, startTag: ValueTag): T =
input.readAttrFunc(startTag)
override fun writeValue(output: IppOutputStream, value: Any) {
output.writeAttrFunc(value as T)
}
}
}
}