/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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import {
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DataTransformOption, ExternalDataTransform, DataTransformDataItem, ExternalDataTransformResultItem
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} from '../../data/helper/transform';
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import { DimensionIndex } from '../../util/types';
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import { parseConditionalExpression, ConditionalExpressionOption } from '../../util/conditionalExpression';
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import { hasOwn, createHashMap } from 'zrender/src/core/util';
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import { makePrintable, throwError } from '../../util/log';
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export interface FilterTransformOption extends DataTransformOption {
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type: 'filter';
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config: ConditionalExpressionOption;
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}
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export const filterTransform: ExternalDataTransform<FilterTransformOption> = {
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type: 'echarts:filter',
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// PEDING: enhance to filter by index rather than create new data
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transform: function (params) {
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// [Caveat] Fail-Fast:
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// Do not return the whole dataset unless user config indicate it explicitly.
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// For example, if no condition specified by mistake, return an empty result
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// is better than return the entire raw soruce for user to find the mistake.
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const upstream = params.upstream;
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let rawItem: DataTransformDataItem;
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const condition = parseConditionalExpression<{ dimIdx: DimensionIndex }>(params.config, {
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valueGetterAttrMap: createHashMap<boolean, string>({ dimension: true }),
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prepareGetValue: function (exprOption) {
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let errMsg = '';
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const dimLoose = exprOption.dimension;
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if (!hasOwn(exprOption, 'dimension')) {
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if (__DEV__) {
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errMsg = makePrintable(
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'Relation condition must has prop "dimension" specified.',
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'Illegal condition:', exprOption
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);
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}
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throwError(errMsg);
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}
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const dimInfo = upstream.getDimensionInfo(dimLoose);
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if (!dimInfo) {
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if (__DEV__) {
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errMsg = makePrintable(
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'Can not find dimension info via: ' + dimLoose + '.\n',
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'Existing dimensions: ', upstream.cloneAllDimensionInfo(), '.\n',
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'Illegal condition:', exprOption, '.\n'
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);
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}
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throwError(errMsg);
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}
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return { dimIdx: dimInfo.index };
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},
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getValue: function (param) {
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return upstream.retrieveValueFromItem(rawItem, param.dimIdx);
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}
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});
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const resultData = [];
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for (let i = 0, len = upstream.count(); i < len; i++) {
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rawItem = upstream.getRawDataItem(i);
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if (condition.evaluate()) {
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resultData.push(rawItem as any);
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}
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}
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return {
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data: resultData as ExternalDataTransformResultItem['data']
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};
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}
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};
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