/*
* Copyright (C) 2016 Jake Wharton
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jakewharton.rx;
import io.reactivex.Observable;
import io.reactivex.functions.Function;
import io.reactivex.observables.GroupedObservable;
/**
* Divides an {@link Observable} that emits items into an {@link Observable} that emits
* {@link Observable Observables}, each one of which emits some subset of the items from the
* original source. The items in each inner {@link Observable} all have a common "key" based on a
* key selector function. A new inner {@link Observable} is emitted and the previous inner
* {@link Observable} completes each time the key changes from the previous item.
*/
public final class WindowIfChanged {
public static <T, K> Observable<GroupedObservable<K, T>> create(Observable<T> upstream,
Function<? super T, ? extends K> keySelector) {
return new WindowIfChangedObservable<>(upstream, keySelector);
}
private WindowIfChanged() {
throw new AssertionError("No instances.");
}
}
