@decaf-ts/core
Version:
Core persistence module for the decaf framework
187 lines • 26.2 kB
JavaScript
import { GroupOperator, Operator, QueryError, } from "./../query/index.js";
import { RamPaginator } from "./RamPaginator.js";
import { InternalError } from "@decaf-ts/db-decorators";
import { Statement } from "./../query/Statement.js";
import { Reflection } from "@decaf-ts/reflection";
/**
* @description RAM-specific query statement builder
* @summary Extends the base Statement class to provide query building functionality for the RAM adapter.
* This class translates high-level query operations into predicates that can filter and sort
* in-memory data structures.
* @template M - The model type being queried
* @template R - The result type returned by the query
* @param {RamAdapter} adapter - The RAM adapter instance to use for executing queries
* @class RamStatement
* @category Ram
* @example
* ```typescript
* // Create a statement for querying User models
* const statement = new RamStatement<User, User>(ramAdapter);
*
* // Build a query to find active users with age > 18
* const results = await statement
* .from(User)
* .where(Condition.and(
* Condition.eq('active', true),
* Condition.gt('age', 18)
* ))
* .orderBy('lastName', 'asc')
* .limit(10)
* .execute();
* ```
*/
export class RamStatement extends Statement {
constructor(adapter) {
super(adapter);
}
/**
* @description Creates a sort comparator function
* @summary Generates a function that compares two model instances based on the orderBy criteria.
* This method handles different data types (string, number, date) and sort directions (asc, desc).
* @return {function(Model, Model): number} A comparator function for sorting model instances
*/
getSort() {
return (el1, el2) => {
if (!this.orderBySelector)
throw new InternalError("orderBySelector not set. Should be impossible");
const selector = this.orderBySelector;
const [key, direction] = selector;
const type = Reflection.getTypeFromDecorator(el1, key);
if (!type)
throw new QueryError(`type not compatible with sorting: ${type}`);
switch (type) {
case "string":
case "String":
return ((direction === "asc" ? 1 : -1) *
el1[key].localeCompare(el2[key]));
case "number":
case "Number":
return ((direction === "asc" ? 1 : -1) *
(el1[key] -
el2[key]));
case "object":
case "Object":
if (el1[key] instanceof Date &&
el2[key] instanceof Date)
return ((direction === "asc" ? 1 : -1) *
(el1[key].valueOf() -
el2[key].valueOf()));
throw new QueryError(`Sorting not supported for not date classes`);
default:
throw new QueryError(`sorting not supported for type ${type}`);
}
};
}
/**
* @description Builds a RAM query from the statement
* @summary Converts the statement's selectors and conditions into a RawRamQuery object
* that can be executed by the RAM adapter. This method assembles all query components
* (select, from, where, limit, offset, sort) into the final query structure.
* @return {RawRamQuery<M>} The constructed RAM query object
*/
build() {
const result = {
select: this.selectSelector,
from: this.fromSelector,
where: this.whereCondition
? this.parseCondition(this.whereCondition).where
: // eslint-disable-next-line @typescript-eslint/no-unused-vars
(el) => {
return true;
},
limit: this.limitSelector,
skip: this.offsetSelector,
};
if (this.orderBySelector)
result.sort = this.getSort();
return result;
}
/**
* @description Creates a paginator for the query
* @summary Builds the query and wraps it in a RamPaginator to enable pagination of results.
* This allows retrieving large result sets in smaller chunks.
* @param {number} size - The page size (number of results per page)
* @return {Promise<Paginator<M, R, RawRamQuery<M>>>} A promise that resolves to a paginator for the query
*/
async paginate(size) {
try {
const query = this.build();
return new RamPaginator(this.adapter, query, size, this.fromSelector);
}
catch (e) {
throw new InternalError(e);
}
}
/**
* @description Parses a condition into a RAM query predicate
* @summary Converts a Condition object into a predicate function that can be used
* to filter model instances in memory. This method handles both simple conditions
* (equals, greater than, etc.) and complex conditions with logical operators (AND, OR).
* @template M - The model type for the condition
* @param {Condition<M>} condition - The condition to parse
* @return {RawRamQuery<M>} A RAM query object with a where predicate function
* @mermaid
* sequenceDiagram
* participant Caller
* participant RamStatement
* participant SimpleCondition
* participant ComplexCondition
*
* Caller->>RamStatement: parseCondition(condition)
* alt Simple condition (eq, gt, lt, etc.)
* RamStatement->>SimpleCondition: Extract attr1, operator, comparison
* SimpleCondition-->>RamStatement: Return predicate function
* else Logical operator (AND, OR)
* RamStatement->>ComplexCondition: Extract nested conditions
* RamStatement->>RamStatement: parseCondition(leftCondition)
* RamStatement->>RamStatement: parseCondition(rightCondition)
* ComplexCondition-->>RamStatement: Combine predicates with logical operator
* end
* RamStatement-->>Caller: Return query with where predicate
*/
parseCondition(condition) {
return {
where: (m) => {
const { attr1, operator, comparison } = condition;
if ([GroupOperator.AND, GroupOperator.OR, Operator.NOT].indexOf(operator) === -1) {
switch (operator) {
case Operator.BIGGER:
return m[attr1] > comparison;
case Operator.BIGGER_EQ:
return m[attr1] >= comparison;
case Operator.DIFFERENT:
return m[attr1] !== comparison;
case Operator.EQUAL:
return m[attr1] === comparison;
case Operator.REGEXP:
if (typeof m[attr1] !== "string")
throw new QueryError(`Invalid regexp comparison on a non string attribute: ${m[attr1]}`);
return !!m[attr1].match(new RegExp(comparison, "g"));
case Operator.SMALLER:
return m[attr1] < comparison;
case Operator.SMALLER_EQ:
return m[attr1] <= comparison;
default:
throw new InternalError(`Invalid operator for standard comparisons: ${operator}`);
}
}
else if (operator === Operator.NOT) {
throw new InternalError("Not implemented");
}
else {
const op1 = this.parseCondition(attr1);
const op2 = this.parseCondition(comparison);
switch (operator) {
case GroupOperator.AND:
return op1.where(m) && op2.where(m);
case GroupOperator.OR:
return op1.where(m) || op2.where(m);
default:
throw new InternalError(`Invalid operator for And/Or comparisons: ${operator}`);
}
}
},
};
}
}
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{\n  Condition,\n  GroupOperator,\n  Operator,\n  Paginator,\n  QueryError,\n} from \"../query\";\nimport { RawRamQuery } from \"./types\";\nimport { Model } from \"@decaf-ts/decorator-validation\";\nimport { RamPaginator } from \"./RamPaginator\";\nimport { InternalError } from \"@decaf-ts/db-decorators\";\nimport { Statement } from \"../query/Statement\";\nimport { Reflection } from \"@decaf-ts/reflection\";\nimport { RamAdapter } from \"./RamAdapter\";\n\n/**\n * @description RAM-specific query statement builder\n * @summary Extends the base Statement class to provide query building functionality for the RAM adapter.\n * This class translates high-level query operations into predicates that can filter and sort\n * in-memory data structures.\n * @template M - The model type being queried\n * @template R - The result type returned by the query\n * @param {RamAdapter} adapter - The RAM adapter instance to use for executing queries\n * @class RamStatement\n * @category Ram\n * @example\n * ```typescript\n * // Create a statement for querying User models\n * const statement = new RamStatement<User, User>(ramAdapter);\n *\n * // Build a query to find active users with age > 18\n * const results = await statement\n *   .from(User)\n *   .where(Condition.and(\n *     Condition.eq('active', true),\n *     Condition.gt('age', 18)\n *   ))\n *   .orderBy('lastName', 'asc')\n *   .limit(10)\n *   .execute();\n * ```\n */\nexport class RamStatement<M extends Model, R> extends Statement<\n  RawRamQuery<M>,\n  M,\n  R\n> {\n  constructor(adapter: RamAdapter) {\n    super(adapter as any);\n  }\n\n  /**\n   * @description Creates a sort comparator function\n   * @summary Generates a function that compares two model instances based on the orderBy criteria.\n   * This method handles different data types (string, number, date) and sort directions (asc, desc).\n   * @return {function(Model, Model): number} A comparator function for sorting model instances\n   */\n  private getSort() {\n    return (el1: Model, el2: Model) => {\n      if (!this.orderBySelector)\n        throw new InternalError(\n          \"orderBySelector not set. Should be impossible\"\n        );\n      const selector = this.orderBySelector;\n      const [key, direction] = selector;\n      const type = Reflection.getTypeFromDecorator(el1, key as string);\n      if (!type)\n        throw new QueryError(`type not compatible with sorting: ${type}`);\n\n      switch (type) {\n        case \"string\":\n        case \"String\":\n          return (\n            (direction === \"asc\" ? 1 : -1) *\n            (el1[key as keyof Model] as unknown as string).localeCompare(\n              el2[key as keyof Model] as unknown as string\n            )\n          );\n        case \"number\":\n        case \"Number\":\n          return (\n            (direction === \"asc\" ? 1 : -1) *\n            ((el1[key as keyof Model] as unknown as number) -\n              (el2[key as keyof Model] as unknown as number))\n          );\n        case \"object\":\n        case \"Object\":\n          if (\n            el1[key as keyof Model] instanceof Date &&\n            el2[key as keyof Model] instanceof Date\n          )\n            return (\n              (direction === \"asc\" ? 1 : -1) *\n              ((el1[key as keyof Model] as unknown as Date).valueOf() -\n                (el2[key as keyof Model] as unknown as Date).valueOf())\n            );\n          throw new QueryError(`Sorting not supported for not date classes`);\n        default:\n          throw new QueryError(`sorting not supported for type ${type}`);\n      }\n    };\n  }\n\n  /**\n   * @description Builds a RAM query from the statement\n   * @summary Converts the statement's selectors and conditions into a RawRamQuery object\n   * that can be executed by the RAM adapter. This method assembles all query components\n   * (select, from, where, limit, offset, sort) into the final query structure.\n   * @return {RawRamQuery<M>} The constructed RAM query object\n   */\n  protected build(): RawRamQuery<M> {\n    const result: RawRamQuery<M> = {\n      select: this.selectSelector,\n      from: this.fromSelector,\n      where: this.whereCondition\n        ? this.parseCondition(this.whereCondition).where\n        : // eslint-disable-next-line @typescript-eslint/no-unused-vars\n          (el: M) => {\n            return true;\n          },\n      limit: this.limitSelector,\n      skip: this.offsetSelector,\n    };\n    if (this.orderBySelector) result.sort = this.getSort();\n    return result;\n  }\n\n  /**\n   * @description Creates a paginator for the query\n   * @summary Builds the query and wraps it in a RamPaginator to enable pagination of results.\n   * This allows retrieving large result sets in smaller chunks.\n   * @param {number} size - The page size (number of results per page)\n   * @return {Promise<Paginator<M, R, RawRamQuery<M>>>} A promise that resolves to a paginator for the query\n   */\n  async paginate(size: number): Promise<Paginator<M, R, RawRamQuery<M>>> {\n    try {\n      const query = this.build();\n      return new RamPaginator<M, R>(\n        this.adapter,\n        query,\n        size,\n        this.fromSelector\n      );\n    } catch (e: any) {\n      throw new InternalError(e);\n    }\n  }\n\n  /**\n   * @description Parses a condition into a RAM query predicate\n   * @summary Converts a Condition object into a predicate function that can be used\n   * to filter model instances in memory. This method handles both simple conditions\n   * (equals, greater than, etc.) and complex conditions with logical operators (AND, OR).\n   * @template M - The model type for the condition\n   * @param {Condition<M>} condition - The condition to parse\n   * @return {RawRamQuery<M>} A RAM query object with a where predicate function\n   * @mermaid\n   * sequenceDiagram\n   *   participant Caller\n   *   participant RamStatement\n   *   participant SimpleCondition\n   *   participant ComplexCondition\n   *\n   *   Caller->>RamStatement: parseCondition(condition)\n   *   alt Simple condition (eq, gt, lt, etc.)\n   *     RamStatement->>SimpleCondition: Extract attr1, operator, comparison\n   *     SimpleCondition-->>RamStatement: Return predicate function\n   *   else Logical operator (AND, OR)\n   *     RamStatement->>ComplexCondition: Extract nested conditions\n   *     RamStatement->>RamStatement: parseCondition(leftCondition)\n   *     RamStatement->>RamStatement: parseCondition(rightCondition)\n   *     ComplexCondition-->>RamStatement: Combine predicates with logical operator\n   *   end\n   *   RamStatement-->>Caller: Return query with where predicate\n   */\n  parseCondition<M extends Model>(condition: Condition<M>): RawRamQuery<M> {\n    return {\n      where: (m: Model) => {\n        const { attr1, operator, comparison } = condition as unknown as {\n          attr1: string | Condition<M>;\n          operator: Operator | GroupOperator;\n          comparison: any;\n        };\n\n        if (\n          [GroupOperator.AND, GroupOperator.OR, Operator.NOT].indexOf(\n            operator as GroupOperator\n          ) === -1\n        ) {\n          switch (operator) {\n            case Operator.BIGGER:\n              return m[attr1 as keyof Model] > comparison;\n            case Operator.BIGGER_EQ:\n              return m[attr1 as keyof Model] >= comparison;\n            case Operator.DIFFERENT:\n              return m[attr1 as keyof Model] !== comparison;\n            case Operator.EQUAL:\n              return m[attr1 as keyof Model] === comparison;\n            case Operator.REGEXP:\n              if (typeof m[attr1 as keyof Model] !== \"string\")\n                throw new QueryError(\n                  `Invalid regexp comparison on a non string attribute: ${m[attr1 as keyof Model]}`\n                );\n              return !!(m[attr1 as keyof Model] as unknown as string).match(\n                new RegExp(comparison, \"g\")\n              );\n            case Operator.SMALLER:\n              return m[attr1 as keyof Model] < comparison;\n            case Operator.SMALLER_EQ:\n              return m[attr1 as keyof Model] <= comparison;\n            default:\n              throw new InternalError(\n                `Invalid operator for standard comparisons: ${operator}`\n              );\n          }\n        } else if (operator === Operator.NOT) {\n          throw new InternalError(\"Not implemented\");\n        } else {\n          const op1: RawRamQuery<any> = this.parseCondition(\n            attr1 as Condition<M>\n          );\n          const op2: RawRamQuery<any> = this.parseCondition(\n            comparison as Condition<M>\n          );\n          switch (operator) {\n            case GroupOperator.AND:\n              return op1.where(m) && op2.where(m);\n            case GroupOperator.OR:\n              return op1.where(m) || op2.where(m);\n            default:\n              throw new InternalError(\n                `Invalid operator for And/Or comparisons: ${operator}`\n              );\n          }\n        }\n      },\n    } as RawRamQuery<any>;\n  }\n}\n"]}