json-streaming-reader/dist/src/JsonStreamRecordBuilder.js

Line delimited and concatenated JSON streaming protocol reader.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var NAMES;
(function (NAMES) {
    NAMES["START_OBJECT"] = "startObject";
    NAMES["END_OBJECT"] = "endObject";
    NAMES["START_ARRAY"] = "startArray";
    NAMES["END_ARRAY"] = "endArray";
    NAMES["KEY_VALUE"] = "keyValue";
    NAMES["STRING_VALUE"] = "stringValue";
    NAMES["NUMBER_VALUE"] = "numberValue";
    NAMES["NULL_VALUE"] = "nullValue";
    NAMES["TRUE_VALUE"] = "trueValue";
    NAMES["FALSE_VALUE"] = "falseValue";
})(NAMES || (NAMES = {}));
class JsonStreamRecordBuilder {
    constructor() {
        this.done = false;
        this.isArray = false;
        this.isObject = false;
    }
    /**
     * Purge builder to start accepting new record
     */
    purge() {
        this.record = undefined;
        this.done = false;
        this.isArray = false;
        this.isObject = false;
        this.childFieldKey = undefined;
        this.childFieldValueBuilder = undefined;
    }
    /**
     * Handle data chunk
     * @param data
     */
    onData(data) {
        if (JsonStreamRecordBuilder.SUPPORTED_NAMES.indexOf(data.name) < 0) {
            throw new Error(`Unable to process JSON chunk data ${JSON.stringify(data)}. Unsupported name.`);
        }
        if (this.done) {
            throw new Error(`Unable to process JSON chunk data ${JSON.stringify(data)}. Record is already parsed.`);
        }
        if (this.childFieldValueBuilder) {
            this.childFieldValueBuilder.onData(data);
            if (this.childFieldValueBuilder.isDone()) {
                if (this.isArray) {
                    this.record.push(this.childFieldValueBuilder.getRecord());
                }
                if (this.isObject) {
                    if (!this.childFieldKey) {
                        throw new Error(`Unable to process JSON chunk data ${JSON.stringify(data)}. Child field key not registered.`);
                    }
                    this.record[this.childFieldKey] = this.childFieldValueBuilder.getRecord();
                }
                this.childFieldValueBuilder = undefined;
                this.childFieldKey = undefined;
            }
            return;
        }
        if (data.name === NAMES.START_OBJECT) {
            if (!this.record) {
                this.isObject = true;
                this.record = {};
            }
            else {
                this.childFieldValueBuilder = new JsonStreamRecordBuilder();
                this.childFieldValueBuilder.onData(data);
            }
            return;
        }
        if (data.name === NAMES.START_ARRAY) {
            if (!this.record) {
                this.isArray = true;
                this.record = [];
            }
            else {
                this.childFieldValueBuilder = new JsonStreamRecordBuilder();
                this.childFieldValueBuilder.onData(data);
            }
            return;
        }
        if (JsonStreamRecordBuilder.END_OBJECT_ARRAY_NAMES.indexOf(data.name) >= 0) {
            this.done = true;
            return;
        }
        if (data.name === NAMES.KEY_VALUE) {
            this.childFieldKey = data.value;
            return;
        }
        /* istanbul ignore else */
        if (JsonStreamRecordBuilder.VALUE_NAMES.indexOf(data.name) >= 0) {
            if (data.name === NAMES.NUMBER_VALUE) {
                data.value = Number(data.value);
            }
            if (this.isArray) {
                this.record.push(data.value);
                return;
            }
            if (this.isObject) {
                if (!this.childFieldKey) {
                    throw new Error(`Unable to process JSON chunk data ${JSON.stringify(data)}. Unable to assign value for missing key.`);
                }
                this.record[this.childFieldKey] = data.value;
                this.childFieldKey = undefined;
                return;
            }
            this.record = data.value;
            this.done = true;
            return;
        }
    }
    /**
     * Check if record construction is done
     */
    isDone() {
        return this.done;
    }
    /**
     * Get constructed record
     */
    getRecord() {
        return this.record;
    }
}
JsonStreamRecordBuilder.SUPPORTED_NAMES = Object.keys(NAMES)
    .map(name => NAMES[name]);
JsonStreamRecordBuilder.END_OBJECT_ARRAY_NAMES = [
    NAMES.END_OBJECT,
    NAMES.END_ARRAY
];
JsonStreamRecordBuilder.VALUE_NAMES = [
    NAMES.STRING_VALUE,
    NAMES.NUMBER_VALUE,
    NAMES.NULL_VALUE,
    NAMES.TRUE_VALUE,
    NAMES.FALSE_VALUE
];
exports.JsonStreamRecordBuilder = JsonStreamRecordBuilder;
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