var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var Subscriber_1 = require('../Subscriber');
var tryCatch_1 = require('../util/tryCatch');
var errorObject_1 = require('../util/errorObject');
var EmptyError_1 = require('../util/EmptyError');
function single(predicate) {
    return this.lift(new SingleOperator(predicate, this));
}
exports.single = single;
var SingleOperator = (function () {
    function SingleOperator(predicate, source) {
        this.predicate = predicate;
        this.source = source;
    }
    SingleOperator.prototype.call = function (subscriber) {
        return new SingleSubscriber(subscriber, this.predicate, this.source);
    };
    return SingleOperator;
})();
var SingleSubscriber = (function (_super) {
    __extends(SingleSubscriber, _super);
    function SingleSubscriber(destination, predicate, source) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.source = source;
        this.seenValue = false;
        this.index = 0;
    }
    SingleSubscriber.prototype.applySingleValue = function (value) {
        if (this.seenValue) {
            this.destination.error('Sequence contains more than one element');
        }
        else {
            this.seenValue = true;
            this.singleValue = value;
        }
    };
    SingleSubscriber.prototype._next = function (value) {
        var predicate = this.predicate;
        var currentIndex = this.index++;
        if (predicate) {
            var result = tryCatch_1.tryCatch(predicate)(value, currentIndex, this.source);
            if (result === errorObject_1.errorObject) {
                this.destination.error(result.e);
            }
            else if (result) {
                this.applySingleValue(value);
            }
        }
        else {
            this.applySingleValue(value);
        }
    };
    SingleSubscriber.prototype._complete = function () {
        var destination = this.destination;
        if (this.index > 0) {
            destination.next(this.seenValue ? this.singleValue : undefined);
            destination.complete();
        }
        else {
            destination.error(new EmptyError_1.EmptyError);
        }
    };
    return SingleSubscriber;
})(Subscriber_1.Subscriber);
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