45 lines
947 B
JavaScript
45 lines
947 B
JavaScript
import { Item_Unresolvable } from '@efforting.tech/errors';
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export class Abstract_Resolver {
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resolve(item) {
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const handler = this.resolve_handler(item);
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if (!handler) {
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throw new Item_Unresolvable({ resolver: this, item });
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}
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return handler({ resolver: this, item });
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}
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}
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export class Chained_Resolver extends Abstract_Resolver {
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constructor(chain_links) {
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super();
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Object.assign(this, { chain_links });
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}
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resolve_handler(item) {
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const { chain_links } = this;
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for (const link of chain_links) {
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const handler = link.resolve_handler(item);
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if (handler) {
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return handler;
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}
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}
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}
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}
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export class Mapping_Resolver extends Abstract_Resolver {
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constructor(rules=new Map(), key_function=null) {
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super();
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Object.assign(this, { rules, key_function });
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}
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resolve_handler(item) {
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const { key_function, rules } = this;
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const key = key_function ? key_function(item) : item;
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return rules.get(key);
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}
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}
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