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node_modules/rxjs/operators/catchError.js

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+"use strict";
+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 OuterSubscriber_1 = require('../OuterSubscriber');
+var subscribeToResult_1 = require('../util/subscribeToResult');
+/**
+ * Catches errors on the observable to be handled by returning a new observable or throwing an error.
+ *
+ * <img src="./img/catch.png" width="100%">
+ *
+ * @example <caption>Continues with a different Observable when there's an error</caption>
+ *
+ * Observable.of(1, 2, 3, 4, 5)
+ *   .map(n => {
+ * 	   if (n == 4) {
+ * 	     throw 'four!';
+ *     }
+ *	   return n;
+ *   })
+ *   .catch(err => Observable.of('I', 'II', 'III', 'IV', 'V'))
+ *   .subscribe(x => console.log(x));
+ *   // 1, 2, 3, I, II, III, IV, V
+ *
+ * @example <caption>Retries the caught source Observable again in case of error, similar to retry() operator</caption>
+ *
+ * Observable.of(1, 2, 3, 4, 5)
+ *   .map(n => {
+ * 	   if (n === 4) {
+ * 	     throw 'four!';
+ *     }
+ * 	   return n;
+ *   })
+ *   .catch((err, caught) => caught)
+ *   .take(30)
+ *   .subscribe(x => console.log(x));
+ *   // 1, 2, 3, 1, 2, 3, ...
+ *
+ * @example <caption>Throws a new error when the source Observable throws an error</caption>
+ *
+ * Observable.of(1, 2, 3, 4, 5)
+ *   .map(n => {
+ *     if (n == 4) {
+ *       throw 'four!';
+ *     }
+ *     return n;
+ *   })
+ *   .catch(err => {
+ *     throw 'error in source. Details: ' + err;
+ *   })
+ *   .subscribe(
+ *     x => console.log(x),
+ *     err => console.log(err)
+ *   );
+ *   // 1, 2, 3, error in source. Details: four!
+ *
+ * @param {function} selector a function that takes as arguments `err`, which is the error, and `caught`, which
+ *  is the source observable, in case you'd like to "retry" that observable by returning it again. Whatever observable
+ *  is returned by the `selector` will be used to continue the observable chain.
+ * @return {Observable} An observable that originates from either the source or the observable returned by the
+ *  catch `selector` function.
+ * @name catchError
+ */
+function catchError(selector) {
+    return function catchErrorOperatorFunction(source) {
+        var operator = new CatchOperator(selector);
+        var caught = source.lift(operator);
+        return (operator.caught = caught);
+    };
+}
+exports.catchError = catchError;
+var CatchOperator = (function () {
+    function CatchOperator(selector) {
+        this.selector = selector;
+    }
+    CatchOperator.prototype.call = function (subscriber, source) {
+        return source.subscribe(new CatchSubscriber(subscriber, this.selector, this.caught));
+    };
+    return CatchOperator;
+}());
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+var CatchSubscriber = (function (_super) {
+    __extends(CatchSubscriber, _super);
+    function CatchSubscriber(destination, selector, caught) {
+        _super.call(this, destination);
+        this.selector = selector;
+        this.caught = caught;
+    }
+    // NOTE: overriding `error` instead of `_error` because we don't want
+    // to have this flag this subscriber as `isStopped`. We can mimic the
+    // behavior of the RetrySubscriber (from the `retry` operator), where
+    // we unsubscribe from our source chain, reset our Subscriber flags,
+    // then subscribe to the selector result.
+    CatchSubscriber.prototype.error = function (err) {
+        if (!this.isStopped) {
+            var result = void 0;
+            try {
+                result = this.selector(err, this.caught);
+            }
+            catch (err2) {
+                _super.prototype.error.call(this, err2);
+                return;
+            }
+            this._unsubscribeAndRecycle();
+            this.add(subscribeToResult_1.subscribeToResult(this, result));
+        }
+    };
+    return CatchSubscriber;
+}(OuterSubscriber_1.OuterSubscriber));
+//# sourceMappingURL=catchError.js.map