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Proof of concept--using Kotlin in Ion Java
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| Original file line number | Diff line number | Diff line change |
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| -keepattributes SourceFile, LineNumberTable | ||
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| -keep class com.amazon.ion.*** | ||
| -keep interface com.amazon.ion.*** | ||
| -keep enum com.amazon.ion.*** | ||
| -keeppackagenames *** |
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| package com.amazon.ion | ||
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| import java.math.BigInteger | ||
| import java.time.Instant | ||
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| /** | ||
| * Returns `this` value, without annotations. | ||
| * If this value has no annotations, returns `this`; | ||
| * otherwise, returns a clone of `this` with the annotations removed. | ||
| */ | ||
| inline fun <reified T : IonValue> T.withoutTypeAnnotations(): T = | ||
| if (typeAnnotations.isNotEmpty()) { | ||
| clone().apply { clearTypeAnnotations() } as T | ||
| } else { | ||
| this | ||
| } | ||
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| /** | ||
| * Makes an IonValue instance read-only. | ||
| */ | ||
| fun <T : IonValue> T.markReadOnly(): T { | ||
| this.makeReadOnly() | ||
| return this | ||
| } | ||
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| /** | ||
| * Create a [Timestamp] from [Instant] with millisecond precision and UTC offset. | ||
| */ | ||
| fun Instant.toTimestamp(): Timestamp = Timestamp.forMillis(this.toEpochMilli(), 0) | ||
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| /** | ||
| * Convert an [Timestamp] into an [Instant], truncating any fractional seconds smaller than millisecond precision. | ||
| */ | ||
| fun Timestamp.toInstant(): Instant = Instant.ofEpochMilli(this.millis) | ||
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| /** | ||
| * Kotlin-friendly extension function for building a new [IonStruct]. | ||
| */ | ||
| inline fun ValueFactory.buildStruct(init: IonStruct.() -> Unit): IonStruct = newEmptyStruct().apply(init) | ||
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| /** | ||
| * Kotlin-friendly extension function for building a new [IonSexp]. | ||
| */ | ||
| inline fun ValueFactory.buildSexp(init: IonSexp.() -> Unit): IonSexp = newEmptySexp().apply(init) | ||
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| /** | ||
| * Kotlin-friendly extension function for building a new [IonList]. | ||
| */ | ||
| inline fun ValueFactory.buildList(init: IonList.() -> Unit): IonList = newEmptyList().apply(init) | ||
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| /** | ||
| * Returns the value of an [IonString] or [IonSymbol], or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.stringValueOrNull(): String? = (this as? IonText)?.stringValue() | ||
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| /** | ||
| * Returns the value of an [IonBlob] or [IonClob], or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.bytesValueOrNull(): ByteArray? = (this as? IonLob)?.bytes | ||
|
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| /** | ||
| * Returns the value of an [IonBool] or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.boolValueOrNull(): Boolean? = (this as? IonBool)?.booleanValue() | ||
|
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| /** | ||
| * Returns the value of an [IonInt] or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.bigIntValueOrNull(): BigInteger? = (this as? IonInt)?.bigIntegerValue() | ||
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| /** | ||
| * Returns the value of an [IonFloat] or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.doubleValueOrNull(): Double? = (this as? IonFloat)?.doubleValue() | ||
|
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| /** | ||
| * Returns the value of an [IonDecimal] or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.decimalValueOrNull(): Decimal? = (this as? IonDecimal)?.decimalValue() | ||
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| /** | ||
| * Returns the value of an [IonTimestamp] or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.timestampValueOrNull(): Timestamp? = (this as? IonTimestamp)?.timestampValue() | ||
|
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| /** | ||
| * Returns the child values of an [IonList] or [IonSexp] or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.childValuesOrNull(): List<IonValue>? = (this as? IonSequence)?.takeIf { !it.isNullValue } | ||
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| /** | ||
| * Returns the fields of an [IonStruct] or `null` if this [IonValue] is another type or an Ion null. | ||
| */ | ||
| fun IonValue.fieldsOrNull(): List<Pair<String, IonValue>>? = (this as? IonStruct)?.takeIf { !it.isNullValue }?.map { it.fieldName to it } | ||
|
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| /** | ||
| * If this [IonValue] is a container type, returns an iterator over the contained values. Otherwise returns an iterator | ||
| * containing this [IonValue]. | ||
| */ | ||
| fun IonValue.asIterator(): Iterator<IonValue> { | ||
| return when (this) { | ||
| is IonContainer -> iterator() | ||
| else -> SingletonIterator(this) | ||
| } | ||
| } | ||
|
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| /** | ||
| * An iterator over one value. | ||
| */ | ||
| private class SingletonIterator<E: Any>(value: E): Iterator<E> { | ||
| private var nextValue: E? = value | ||
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| override fun hasNext(): Boolean = nextValue != null | ||
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| override fun next(): E = nextValue.also { nextValue = null } ?: throw NoSuchElementException() | ||
| } |
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