@tsdi/pack/es2015/transforms/StreamActivity.js

@tsdi/pack is simple build tasks, base on AOP, Ioc container, via @tsdi. dev build pack activities.

import { __awaiter, __decorate, __metadata } from "tslib";
import { isArray } from '@tsdi/ioc';
import { Input } from '@tsdi/components';
import { Task } from '@tsdi/activities';
import { TransformActivity } from './TransformActivity';
let StreamActivity = class StreamActivity extends TransformActivity {
    execute(ctx) {
        return __awaiter(this, void 0, void 0, function* () {
            let pipes = yield ctx.resolveExpression(this.pipes);
            if (isArray(pipes)) {
                pipes = pipes.filter(p => p);
            }
            if (pipes && pipes.length) {
                return yield this.pipeStreams(ctx, ctx.getData(), ...pipes);
            }
        });
    }
    /**
     * stream pipe transform.
     *
     * @protected
     * @param {NodeActivityContext} ctx
     * @param {ITransform} stream
     * @param {...Expression<ITransform>[]} pipes
     * @returns {Promise<ITransform>}
     * @memberof StreamActivity
     */
    pipeStreams(ctx, stream, ...pipes) {
        return __awaiter(this, void 0, void 0, function* () {
            if (pipes.length < 1) {
                return stream;
            }
            if (pipes.length === 1) {
                return yield this.pipeStream(ctx, stream, pipes[0]);
            }
            let pstream = Promise.resolve(stream);
            pipes.forEach(transform => {
                if (transform) {
                    pstream = pstream
                        .then(stm => {
                        return this.pipeStream(ctx, stm, transform);
                    });
                }
            });
            return yield pstream;
        });
    }
    static ρAnn() {
        return { "name": "StreamActivity", "params": { "execute": ["ctx"], "pipeStreams": ["ctx", "stream", "pipes"] } };
    }
};
__decorate([
    Input('pipes'),
    __metadata("design:type", Array)
], StreamActivity.prototype, "pipes", void 0);
StreamActivity = __decorate([
    Task('pipes, [pipes]')
], StreamActivity);
export { StreamActivity };

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