apache-arrow/builder/list.js

Apache Arrow columnar in-memory format

"use strict";
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
Object.defineProperty(exports, "__esModule", { value: true });
exports.ListBuilder = void 0;
const run_1 = require("./run");
const schema_1 = require("../schema");
const type_1 = require("../type");
const buffer_1 = require("./buffer");
const builder_1 = require("../builder");
/** @ignore */
class ListBuilder extends builder_1.VariableWidthBuilder {
    constructor(opts) {
        super(opts);
        this._run = new run_1.Run();
        this._offsets = new buffer_1.OffsetsBufferBuilder();
    }
    addChild(child, name = '0') {
        if (this.numChildren > 0) {
            throw new Error('ListBuilder can only have one child.');
        }
        this.children[this.numChildren] = child;
        this.type = new type_1.List(new schema_1.Field(name, child.type, true));
        return this.numChildren - 1;
    }
    clear() {
        this._run.clear();
        return super.clear();
    }
    _flushPending(pending) {
        const run = this._run;
        const offsets = this._offsets;
        const setValue = this._setValue;
        let index = 0, value;
        for ([index, value] of pending) {
            if (value === undefined) {
                offsets.set(index, 0);
            }
            else {
                offsets.set(index, value.length);
                setValue(this, index, run.bind(value));
            }
        }
    }
}
exports.ListBuilder = ListBuilder;

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