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* デフォルト値を持つ値を提供します.
*/
export interface ValueSupplier<T> {
/**
* 値を取得します.
*
* 値が存在しないときはデフォルト値を返します.
*/
get (): T
/**
* デフォルト値を取得します.
*/
default (): T
/**
* 値が有効な場合、格納します.
*
* @param value 格納する値.
*/
setIf (value: T): void
/**
* 値が有効な場合、デフォルト値として格納します.
*
* @param value 格納する値.
*/
defaultIf (value: T): void
}
export abstract class ValueValidator<T> {
abstract isInvalid (value: T): boolean
getMessage (value: T): string {
return `値 "${typeof value === 'object' ? JSON.stringify(value) : value}" は設定できません.`
}
}
export class DefaultValueProvider<T> {
private value: T
constructor (initial: T, private validator?: ValueValidator<T>) {
this.throwsIf(initial)
this.value = initial
}
get (): T {
return this.value
}
set (value: T): void {
this.throwsIf(value)
this.value = value
}
private throwsIf (value: T): void {
if (this.validator?.isInvalid(value)) {
throw new Error(this.validator.getMessage(value))
}
}
}
export class PrimitiveValueSupplier<T> implements ValueSupplier<T> {
protected _value?: T
// eslint-disable-next-line no-useless-constructor
protected constructor (protected defaultValue: DefaultValueProvider<T>, protected validator?: ValueValidator<T>) {}
get (): T {
return this._value ?? this.defaultValue.get()
}
default (): T {
return this.defaultValue.get()
}
setIf (value?: T): void {
if (this.isValid(value)) {
this.throwsIf(value)
this._value = value
}
}
defaultIf (value?: T): void {
if (this.isValid(value)) {
this.throwsIf(value)
this.defaultValue.set(value)
}
}
protected isValid (value?: T): value is T {
return value !== undefined && value !== null
}
protected throwsIf (value: T): void {
if (this.validator?.isInvalid(value)) {
throw new Error(this.validator.getMessage(value))
}
}
static create <V> (initial: V, validator?: ValueValidator<V>): PrimitiveValueSupplier<V> {
return new PrimitiveValueSupplier(new DefaultValueProvider<V>(initial, validator), validator)
}
}
export class ObjectSupplier<T> extends PrimitiveValueSupplier<T> implements ValueSupplier<T> {
override setIf (obj?: Partial<T>): void {
if (this.isValid(obj)) {
if (this.validator?.isInvalid(obj)) {
throw new Error(this.validator.getMessage(obj))
}
this._value = this.parseForcibly(obj)
}
}
override defaultIf (obj?: Partial<T>): void {
if (this.isValid(obj)) {
if (this.validator?.isInvalid(obj)) {
throw new Error(this.validator.getMessage(obj))
}
this.defaultValue.set(this.parseForcibly(obj))
}
}
protected override isValid (obj?: Partial<T>): obj is T {
return super.isValid(obj as T) && !Object.keys(this.defaultValue.get() as object).some(key => !Object.prototype.hasOwnProperty.call(obj, key))
}
private parseForcibly (obj?: Partial<T>): T {
return Object.keys(this.defaultValue.get() as object).reduce((_obj, current) => {
_obj[current] = (obj as Record<string, unknown>)[current]
return _obj
}, {} as Record<string, unknown>) as T
}
static override create <V> (initial: V, validator?: ValueValidator<V>): ObjectSupplier<V> {
return new ObjectSupplier<V>(new DefaultValueProvider<V>(initial, validator), validator)
}
}
export class RecordSupplier<K extends string, V> implements ValueSupplier<Record<K, V>> {
private readonly store = new Map<K, PrimitiveValueSupplier<V>>()
protected constructor (initial: Record<K, V>, private validator?: ValueValidator<V>) {
for (const key of Object.keys(initial) as K[]) {
this.store.set(key, PrimitiveValueSupplier.create(initial[key], validator))
}
}
get (): Record<K, V> {
return [...this.store.entries()].reduce((obj, [key, supplier]) => {
obj[key] = supplier.get()
return obj
}, {} as Record<K, V>)
}
default (): Record<K, V> {
return [...this.store.entries()].reduce((obj, [key, supplier]) => {
obj[key] = supplier.default()
return obj
}, {} as Record<K, V>)
}
setIf (obj: Partial<Record<K, V>>) {
for (const key of Object.keys(obj) as K[]) {
this.store.get(key)?.setIf(obj[key])
}
}
defaultIf (obj: Partial<Record<K, V>>) {
for (const key of Object.keys(obj) as K[]) {
this.store.get(key)?.defaultIf(obj[key])
}
}
static create <K extends string, V> (initial: Record<K, V>, validator?: ValueValidator<V>): RecordSupplier<K, V> {
return new RecordSupplier<K, V>(initial, validator)
}
}
export class ArraySupplier<T> implements ValueSupplier<T[]> {
private defaultStore: T[] = []
private store: T[] = []
// eslint-disable-next-line no-useless-constructor
protected constructor (protected defaultValue: T[], protected validator?: ValueValidator<T[]>) {
this.throwsIf(defaultValue)
this.defaultStore = [...defaultValue]
}
addDefault (value: T): void {
this.throwsIf([...this.defaultStore, value])
this.defaultStore.push(value)
}
default (): T[] {
return [...this.defaultStore]
}
defaultIf (value?: T[]): void {
if (this.isValid(value)) {
this.throwsIf(value)
this.defaultStore = [...value]
}
}
add (value: T): void {
this.throwsIf([...this.store, value])
this.store.push(value)
}
get (): T[] {
return [...this.defaultStore, ...this.store]
}
setIf (value?: T[]): void {
if (this.isValid(value)) {
this.throwsIf(value)
this.store = [...value]
}
}
protected isValid (value?: T[]): value is T[] {
return value !== undefined && value !== null
}
protected throwsIf (value: T[]): void {
if (this.validator?.isInvalid(value)) {
throw new Error(this.validator.getMessage(value))
}
}
static create <V> (initial: V[], validator?: ValueValidator<V[]>): ArraySupplier<V> {
return new ArraySupplier(initial, validator)
}
}
export class OptionalValueSupplier<T> implements ValueSupplier<T | undefined> {
private _value?: T
// eslint-disable-next-line no-useless-constructor
constructor (private _default?: T) {}
default (): T | undefined {
return this._default
}
defaultIf (value: T | undefined) {
this._default = value
}
get (): T | undefined {
return this._value ?? this._default
}
setIf (value: T | undefined) {
this._value = value
}
static create <V> (initial?: V): OptionalValueSupplier<V> {
return new OptionalValueSupplier<V>(initial)
}
}
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