rx.internal.operators.OperatorSingle Maven / Gradle / Ivy
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/**
* Copyright 2014 Netflix, Inc.
*
* 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 rx.internal.operators;
import java.util.NoSuchElementException;
import rx.Observable.Operator;
import rx.Subscriber;
import rx.internal.producers.SingleProducer;
import rx.plugins.RxJavaHooks;
/**
* If the Observable completes after emitting a single item that matches a
* predicate, return an Observable containing that item. If it emits more than
* one such item or no item, throw an IllegalArgumentException.
* @param the value type
*/
public final class OperatorSingle implements Operator {
private final boolean hasDefaultValue;
private final T defaultValue;
static final class Holder {
final static OperatorSingle INSTANCE = new OperatorSingle