kura/lib/AbstractFileWriter.js

The FileSystem API abstraction library.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.AbstractFileWriter = void 0;
const FileSystemUtil_1 = require("./FileSystemUtil");
const FileError_1 = require("./FileError");
class AbstractFileWriter {
    constructor(fileEntry, file) {
        this.fileEntry = fileEntry;
        this.file = file;
        this.position = 0;
    }
    get length() {
        return this.fileEntry.size;
    }
    abort() {
        throw new FileError_1.NotImplementedError(this.fileEntry.filesystem.name, this.fileEntry.fullPath);
    }
    addEventListener(type, listener, options) {
        throw new FileError_1.NotImplementedError(this.fileEntry.filesystem.name, this.fileEntry.fullPath);
    }
    dispatchEvent(event) {
        throw new FileError_1.NotImplementedError(this.fileEntry.filesystem.name, this.fileEntry.fullPath);
    }
    removeEventListener(type, callback, options) {
        throw new FileError_1.NotImplementedError(this.fileEntry.filesystem.name, this.fileEntry.fullPath);
    }
    seek(offset) {
        this.position = offset;
        if (this.length < this.position) {
            this.position = this.length;
        }
        else if (this.position < 0) {
            this.position = 0;
        }
    }
    truncate(size) {
        const current = this.file;
        let file;
        if (current) {
            if (size < this.length) {
                file = (0, FileSystemUtil_1.blobToFile)([current.slice(0, size)], current.name, Date.now());
            }
            else {
                file = (0, FileSystemUtil_1.blobToFile)([current, new Uint8Array(size - this.length)], current.name, Date.now());
            }
        }
        else {
            file = (0, FileSystemUtil_1.createEmptyFile)(this.fileEntry.name);
        }
        this.doWrite(file, () => {
            this.file = file;
            this.position = 0;
        });
    }
    write(data) {
        const current = this.file;
        if (current) {
            const head = current.slice(0, this.position);
            const tail = current.slice(this.position + data.size);
            let padding = this.position - head.size;
            if (padding < 0) {
                padding = 0;
            }
            const file = (0, FileSystemUtil_1.blobToFile)([head, new Uint8Array(padding), data, tail], current.name, Date.now());
            this.doWrite(file, () => {
                this.file = file;
                this.position += data.size;
            });
        }
        else {
            const file = (0, FileSystemUtil_1.blobToFile)([data], this.fileEntry.name, Date.now());
            this.doWrite(file, () => {
                this.file = file;
                this.position = data.size;
            });
        }
    }
    doWrite(blob, onsuccess) {
        const obj = {
            name: this.fileEntry.name,
            fullPath: this.fileEntry.fullPath,
            lastModified: Date.now(),
            size: blob.size,
        };
        const accessor = this.fileEntry.params.accessor;
        accessor
            .putObject(obj, blob)
            .then(() => {
            this.fileEntry.params.lastModified = obj.lastModified;
            this.fileEntry.params.size = obj.size;
            onsuccess();
            if (this.onwriteend) {
                const evt = {
                    loaded: this.position,
                    total: this.length,
                    lengthComputable: true,
                };
                this.onwriteend(evt);
            }
        })
            .catch((err) => {
            if (this.onerror) {
                const evt = {
                    error: err,
                    loaded: this.position,
                    total: this.length,
                    lengthComputable: true,
                };
                this.onerror(evt);
            }
            else {
                console.error("AbstractFileWriter#doWrite", err);
            }
        });
    }
}
exports.AbstractFileWriter = AbstractFileWriter;
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