hu.akarnokd.rxjava3.expr.StatementCompletable Maven / Gradle / Ivy
/*
* Copyright 2016-2019 David Karnok
*
* 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 hu.akarnokd.rxjava3.expr;
import java.util.Map;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.functions.ObjectHelper;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
/**
* Imperative statements expressed as Completable operators.
*/
public final class StatementCompletable {
/** Factory class. */
private StatementCompletable() { throw new IllegalStateException("No instances!"); }
/**
* Return a particular one of several possible Completables based on a case
* selector, or a default Completable if the case selector does not map to
* a particular one.
*
* 
*
* @param
* the case key type
* @param caseSelector
* the function that produces a case key when an
* CompletableObserver subscribes
* @param mapOfCases
* a map that maps a case key to a Completable
* @param defaultCase
* the default Completable if the {@code mapOfCases} doesn't contain a value for the key returned by the {@code caseSelector}
* @return a particular Completable chosen by key from the map of
* Completables, or the default case if no Completable matches the key
*/
public static Completable switchCase(Supplier caseSelector,
Map mapOfCases,
CompletableSource defaultCase) {
ObjectHelper.requireNonNull(caseSelector, "caseSelector is null");
ObjectHelper.requireNonNull(mapOfCases, "mapOfCases is null");
ObjectHelper.requireNonNull(defaultCase, "defaultCase is null");
return RxJavaPlugins.onAssembly(new CompletableSwitchCase(caseSelector, mapOfCases, defaultCase));
}
/**
* Return a Completable that emits the emissions from one specified
* Completable if a condition evaluates to true, or from another specified
* Completable otherwise.
*
* 
*
* @param condition
* the condition that decides which Completable to emit the
* emissions from
* @param then
* the Completable sequence to emit to if {@code condition} is {@code true}
* @param orElse
* the Completable sequence to emit to if {@code condition} is {@code false}
* @return a Completable that mimics either the {@code then} or {@code orElse} Completables depending on a condition function
*/
public static Completable ifThen(BooleanSupplier condition, CompletableSource then,
Completable orElse) {
ObjectHelper.requireNonNull(condition, "condition is null");
ObjectHelper.requireNonNull(then, "then is null");
ObjectHelper.requireNonNull(orElse, "orElse is null");
return RxJavaPlugins.onAssembly(new CompletableIfThen(condition, then, orElse));
}
}