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MathObservable #942

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merged 1 commit into from
Mar 6, 2014
Merged

MathObservable #942

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31 changes: 31 additions & 0 deletions rxjava-contrib/rxjava-math/build.gradle
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apply plugin: 'osgi'

sourceCompatibility = JavaVersion.VERSION_1_6
targetCompatibility = JavaVersion.VERSION_1_6

dependencies {
compile project(':rxjava-core')
testCompile project(":rxjava-core").sourceSets.test.output
provided 'junit:junit-dep:4.10'
provided 'org.mockito:mockito-core:1.8.5'
}

javadoc {
options {
doclet = "org.benjchristensen.doclet.DocletExclude"
docletpath = [rootProject.file('./gradle/doclet-exclude.jar')]
stylesheetFile = rootProject.file('./gradle/javadocStyleSheet.css')
windowTitle = "RxJava Javadoc ${project.version}"
}
options.addStringOption('top').value = '<h2 class="title" style="padding-top:40px">RxJava</h2>'
}

jar {
manifest {
name = 'rxjava-math'
instruction 'Bundle-Vendor', 'Netflix'
instruction 'Bundle-DocURL', 'https://github.com/Netflix/RxJava'
instruction 'Import-Package', '!org.junit,!junit.framework,!org.mockito.*,*'
instruction 'Fragment-Host', 'com.netflix.rxjava.core'
}
}
348 changes: 348 additions & 0 deletions rxjava-contrib/rxjava-math/src/main/java/rx/math/operators/OperationAverage.java
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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.math.operators;

import rx.Observable;
import rx.Observable.OnSubscribeFunc;
import rx.Observer;
import rx.Subscription;
import rx.functions.Func1;
import rx.functions.Func2;

/**
* A few operators for implementing the averaging operation.
*
* @see <a href="http://msdn.microsoft.com/en-us/library/system.reactive.linq.observable.average%28v=vs.103%29.aspx">MSDN: Observable.Average</a>
*/
public final class OperationAverage {
private static final class Tuple2<T> {
private final T current;
private final Integer count;

private Tuple2(T v1, Integer v2) {
current = v1;
count = v2;
}
}

public static Observable<Integer> average(Observable<Integer> source) {
return source.reduce(new Tuple2<Integer>(0, 0), new Func2<Tuple2<Integer>, Integer, Tuple2<Integer>>() {
@Override
public Tuple2<Integer> call(Tuple2<Integer> accu, Integer next) {
return new Tuple2<Integer>(accu.current + next, accu.count + 1);
}
}).map(new Func1<Tuple2<Integer>, Integer>() {
@Override
public Integer call(Tuple2<Integer> result) {
if (result.count == 0) {
throw new IllegalArgumentException("Sequence contains no elements");
}
return result.current / result.count;
}
});
}

public static Observable<Long> averageLongs(Observable<Long> source) {
return source.reduce(new Tuple2<Long>(0L, 0), new Func2<Tuple2<Long>, Long, Tuple2<Long>>() {
@Override
public Tuple2<Long> call(Tuple2<Long> accu, Long next) {
return new Tuple2<Long>(accu.current + next, accu.count + 1);
}
}).map(new Func1<Tuple2<Long>, Long>() {
@Override
public Long call(Tuple2<Long> result) {
if (result.count == 0) {
throw new IllegalArgumentException("Sequence contains no elements");
}
return result.current / result.count;
}
});
}

public static Observable<Float> averageFloats(Observable<Float> source) {
return source.reduce(new Tuple2<Float>(0.0f, 0), new Func2<Tuple2<Float>, Float, Tuple2<Float>>() {
@Override
public Tuple2<Float> call(Tuple2<Float> accu, Float next) {
return new Tuple2<Float>(accu.current + next, accu.count + 1);
}
}).map(new Func1<Tuple2<Float>, Float>() {
@Override
public Float call(Tuple2<Float> result) {
if (result.count == 0) {
throw new IllegalArgumentException("Sequence contains no elements");
}
return result.current / result.count;
}
});
}

public static Observable<Double> averageDoubles(Observable<Double> source) {
return source.reduce(new Tuple2<Double>(0.0d, 0), new Func2<Tuple2<Double>, Double, Tuple2<Double>>() {
@Override
public Tuple2<Double> call(Tuple2<Double> accu, Double next) {
return new Tuple2<Double>(accu.current + next, accu.count + 1);
}
}).map(new Func1<Tuple2<Double>, Double>() {
@Override
public Double call(Tuple2<Double> result) {
if (result.count == 0) {
throw new IllegalArgumentException("Sequence contains no elements");
}
return result.current / result.count;
}
});
}

/**
* Compute the average by extracting integer values from the source via an
* extractor function.
*
* @param <T>
* the source value type
*/
public static final class AverageIntegerExtractor<T> implements OnSubscribeFunc<Integer> {
final Observable<? extends T> source;
final Func1<? super T, Integer> valueExtractor;

public AverageIntegerExtractor(Observable<? extends T> source, Func1<? super T, Integer> valueExtractor) {
this.source = source;
this.valueExtractor = valueExtractor;
}

@Override
public Subscription onSubscribe(Observer<? super Integer> t1) {
return source.subscribe(new AverageObserver(t1));
}

/** Computes the average. */
private final class AverageObserver implements Observer<T> {
final Observer<? super Integer> observer;
int sum;
int count;

public AverageObserver(Observer<? super Integer> observer) {
this.observer = observer;
}

@Override
public void onNext(T args) {
sum += valueExtractor.call(args);
count++;
}

@Override
public void onError(Throwable e) {
observer.onError(e);
}

@Override
public void onCompleted() {
if (count > 0) {
try {
observer.onNext(sum / count);
} catch (Throwable t) {
observer.onError(t);
return;
}
observer.onCompleted();
} else {
observer.onError(new IllegalArgumentException("Sequence contains no elements"));
}
}

}
}

/**
* Compute the average by extracting long values from the source via an
* extractor function.
*
* @param <T>
* the source value type
*/
public static final class AverageLongExtractor<T> implements OnSubscribeFunc<Long> {
final Observable<? extends T> source;
final Func1<? super T, Long> valueExtractor;

public AverageLongExtractor(Observable<? extends T> source, Func1<? super T, Long> valueExtractor) {
this.source = source;
this.valueExtractor = valueExtractor;
}

@Override
public Subscription onSubscribe(Observer<? super Long> t1) {
return source.subscribe(new AverageObserver(t1));
}

/** Computes the average. */
private final class AverageObserver implements Observer<T> {
final Observer<? super Long> observer;
long sum;
int count;

public AverageObserver(Observer<? super Long> observer) {
this.observer = observer;
}

@Override
public void onNext(T args) {
sum += valueExtractor.call(args);
count++;
}

@Override
public void onError(Throwable e) {
observer.onError(e);
}

@Override
public void onCompleted() {
if (count > 0) {
try {
observer.onNext(sum / count);
} catch (Throwable t) {
observer.onError(t);
return;
}
observer.onCompleted();
} else {
observer.onError(new IllegalArgumentException("Sequence contains no elements"));
}
}

}
}

/**
* Compute the average by extracting float values from the source via an
* extractor function.
*
* @param <T>
* the source value type
*/
public static final class AverageFloatExtractor<T> implements OnSubscribeFunc<Float> {
final Observable<? extends T> source;
final Func1<? super T, Float> valueExtractor;

public AverageFloatExtractor(Observable<? extends T> source, Func1<? super T, Float> valueExtractor) {
this.source = source;
this.valueExtractor = valueExtractor;
}

@Override
public Subscription onSubscribe(Observer<? super Float> t1) {
return source.subscribe(new AverageObserver(t1));
}

/** Computes the average. */
private final class AverageObserver implements Observer<T> {
final Observer<? super Float> observer;
float sum;
int count;

public AverageObserver(Observer<? super Float> observer) {
this.observer = observer;
}

@Override
public void onNext(T args) {
sum += valueExtractor.call(args);
count++;
}

@Override
public void onError(Throwable e) {
observer.onError(e);
}

@Override
public void onCompleted() {
if (count > 0) {
try {
observer.onNext(sum / count);
} catch (Throwable t) {
observer.onError(t);
return;
}
observer.onCompleted();
} else {
observer.onError(new IllegalArgumentException("Sequence contains no elements"));
}
}

}
}

/**
* Compute the average by extracting double values from the source via an
* extractor function.
*
* @param <T>
* the source value type
*/
public static final class AverageDoubleExtractor<T> implements OnSubscribeFunc<Double> {
final Observable<? extends T> source;
final Func1<? super T, Double> valueExtractor;

public AverageDoubleExtractor(Observable<? extends T> source, Func1<? super T, Double> valueExtractor) {
this.source = source;
this.valueExtractor = valueExtractor;
}

@Override
public Subscription onSubscribe(Observer<? super Double> t1) {
return source.subscribe(new AverageObserver(t1));
}

/** Computes the average. */
private final class AverageObserver implements Observer<T> {
final Observer<? super Double> observer;
double sum;
int count;

public AverageObserver(Observer<? super Double> observer) {
this.observer = observer;
}

@Override
public void onNext(T args) {
sum += valueExtractor.call(args);
count++;
}

@Override
public void onError(Throwable e) {
observer.onError(e);
}

@Override
public void onCompleted() {
if (count > 0) {
try {
observer.onNext(sum / count);
} catch (Throwable t) {
observer.onError(t);
return;
}
observer.onCompleted();
} else {
observer.onError(new IllegalArgumentException("Sequence contains no elements"));
}
}

}
}
}
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