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split-combine.ts
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split-combine.ts
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/*
* Copyright 2015-2016 Imply Data, Inc.
* Copyright 2017-2018 Allegro.pl
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { Duration } from "chronoshift";
import { Class, Instance } from "immutable-class";
import { $, Expression, ExpressionJS, LimitExpression, NumberBucketExpression, RefExpression, SortExpression, TimeBucketExpression } from "plywood";
import { Dimension } from "../dimension/dimension";
import { Dimensions } from "../dimension/dimensions";
export interface SplitCombineValue {
expression: Expression;
bucketAction: Expression;
sortAction: SortExpression;
limitAction: LimitExpression;
}
export type SplitCombineJS = string | SplitCombineJSFull;
export interface SplitCombineJSFull {
expression: ExpressionJS;
bucketAction?: ExpressionJS;
sortAction?: ExpressionJS;
limitAction?: ExpressionJS;
}
export interface SplitCombineContext {
dimensions: Dimensions;
}
let check: Class<SplitCombineValue, SplitCombineJS>;
export class SplitCombine implements Instance<SplitCombineValue, SplitCombineJS> {
static SORT_ON_DIMENSION_PLACEHOLDER = "__SWIV_SORT_ON_DIMENSIONS__";
static isSplitCombine(candidate: any): candidate is SplitCombine {
return candidate instanceof SplitCombine;
}
static fromExpression(expression: Expression): SplitCombine {
return new SplitCombine({
expression,
bucketAction: null,
sortAction: null,
limitAction: null
});
}
static fromJS(parameters: SplitCombineJS, context?: SplitCombineContext): SplitCombine {
if (typeof parameters === "string") {
if (!context) throw new Error("must have context for string split");
const dimension = context.dimensions.getDimensionByName(parameters);
if (!dimension) throw new Error(`can not find dimension ${parameters}`);
return new SplitCombine({
expression: dimension.expression,
bucketAction: null,
sortAction: null,
limitAction: null
});
} else {
const value: SplitCombineValue = {
expression: Expression.fromJSLoose(parameters.expression),
bucketAction: null,
sortAction: null,
limitAction: null
};
if (parameters.bucketAction) value.bucketAction = Expression.fromJS(parameters.bucketAction);
if (parameters.sortAction) value.sortAction = SortExpression.fromJS(parameters.sortAction);
if (parameters.limitAction) value.limitAction = LimitExpression.fromJS(parameters.limitAction);
return new SplitCombine(value);
}
}
public expression: Expression;
public bucketAction: Expression;
public sortAction: SortExpression;
public limitAction: LimitExpression;
constructor(parameters: SplitCombineValue) {
this.expression = parameters.expression;
if (!this.expression) throw new Error("must have expression");
this.bucketAction = parameters.bucketAction;
this.sortAction = parameters.sortAction;
this.limitAction = parameters.limitAction;
}
public valueOf(): SplitCombineValue {
return {
expression: this.expression,
bucketAction: this.bucketAction,
sortAction: this.sortAction,
limitAction: this.limitAction
};
}
public toJS(): SplitCombineJS {
const js: SplitCombineJSFull = {
expression: this.expression.toJS()
};
if (this.bucketAction) js.bucketAction = this.bucketAction.toJS();
if (this.sortAction) js.sortAction = this.sortAction.toJS();
if (this.limitAction) js.limitAction = this.limitAction.toJS();
return js;
}
public toJSON(): SplitCombineJS {
return this.toJS();
}
public toString(): string {
return `[SplitCombine: ${this.expression}]`;
}
public equals(other: SplitCombine): boolean {
const { expression, bucketAction, sortAction, limitAction } = this;
return SplitCombine.isSplitCombine(other) &&
expression.equals(other.expression) &&
Boolean(bucketAction) === Boolean(other.bucketAction) &&
(!bucketAction || bucketAction.equals(other.bucketAction)) &&
Boolean(sortAction) === Boolean(other.sortAction) &&
(!sortAction || sortAction.equals(other.sortAction)) &&
Boolean(limitAction) === Boolean(other.limitAction) &&
(!limitAction || limitAction.equals(other.limitAction));
}
public equalsByExpression(other: SplitCombine): boolean {
const { expression } = this;
return SplitCombine.isSplitCombine(other) && expression.equals(other.expression);
}
public withTimeShift(filter: Expression, shift: Duration): SplitCombine {
const { expression } = this;
if (expression instanceof RefExpression && expression.name === "__time") {
return new SplitCombine({
...this.valueOf(),
expression: filter.then(expression).fallback(expression.timeShift(shift))
});
}
return this;
}
public toSplitExpression(): Expression {
const { expression, bucketAction } = this;
if (!bucketAction) return expression;
return expression.performAction(bucketAction);
}
public toKey(): string {
return this.toSplitExpression().toString();
}
public getNormalizedSortExpression(dimensions: Dimensions): SortExpression {
const { sortAction } = this;
const dimension = this.getDimension(dimensions);
if (!sortAction) return null;
if (sortAction.refName() === dimension.name) {
return sortAction.changeExpression($(SplitCombine.SORT_ON_DIMENSION_PLACEHOLDER)) as SortExpression;
}
return sortAction;
}
public changeBucketAction(bucketAction: Expression): SplitCombine {
const value = this.valueOf();
value.bucketAction = bucketAction;
return new SplitCombine(value);
}
public changeSortExpression(sortAction: SortExpression): SplitCombine {
const value = this.valueOf();
value.sortAction = sortAction;
return new SplitCombine(value);
}
public changeSortExpressionFromNormalized(sortAction: SortExpression, dimensions: Dimensions): SplitCombine {
if (sortAction.refName() === SplitCombine.SORT_ON_DIMENSION_PLACEHOLDER) {
const dimension = dimensions.getDimensionByExpression(this.expression);
if (!dimension) throw new Error("can not find dimension for split");
sortAction = sortAction.changeExpression($(dimension.name)) as SortExpression;
}
return this.changeSortExpression(sortAction);
}
public changeLimitExpression(limitAction: LimitExpression): SplitCombine {
const value = this.valueOf();
value.limitAction = limitAction;
return new SplitCombine(value);
}
public changeLimit(limit: number): SplitCombine {
const limitAction = limit === null ? null : new LimitExpression({ value: limit });
return this.changeLimitExpression(limitAction);
}
public timezoneDependant(): boolean {
const { bucketAction } = this;
if (!bucketAction) return false;
return bucketAction.needsEnvironment();
}
public getDimension(dimensions: Dimensions): Dimension {
return dimensions.getDimensionByExpression(this.expression);
}
public getTitle(dimensions: Dimensions): string {
const dimension = this.getDimension(dimensions);
return (dimension ? dimension.title : "?") + this.getBucketTitle();
}
public getBucketTitle(): string {
const bucketAction = this.bucketAction;
if (bucketAction instanceof TimeBucketExpression) {
return ` (${bucketAction.duration.getDescription(true)})`;
} else if (bucketAction instanceof NumberBucketExpression) {
return ` (by ${bucketAction.size})`;
}
return "";
}
}