77 lines
1.8 KiB
Java
77 lines
1.8 KiB
Java
/*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* license agreements; and to You under the Apache License, version 2.0:
|
|
*
|
|
* https://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* This file is part of the Apache Pekko project, derived from Akka.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2018-2022 Lightbend Inc. <https://www.lightbend.com>
|
|
*/
|
|
|
|
package jdocs.stream;
|
|
|
|
import org.apache.pekko.actor.ActorRef;
|
|
|
|
import java.util.function.Predicate;
|
|
|
|
/**
|
|
* Acts as if `System.out.println()` yet swallows all messages. Useful for putting printlines in
|
|
* examples yet without polluting the build with them.
|
|
*/
|
|
public class SilenceSystemOut {
|
|
|
|
private SilenceSystemOut() {}
|
|
|
|
public static System get() {
|
|
return new System(
|
|
new System.Println() {
|
|
@Override
|
|
public void println(String s) {
|
|
// ignore
|
|
}
|
|
});
|
|
}
|
|
|
|
public static System get(ActorRef probe) {
|
|
return new System(
|
|
new System.Println() {
|
|
@Override
|
|
public void println(String s) {
|
|
probe.tell(s, ActorRef.noSender());
|
|
}
|
|
});
|
|
}
|
|
|
|
public static System get(Predicate<String> filter, ActorRef probe) {
|
|
return new System(
|
|
new System.Println() {
|
|
@Override
|
|
public void println(String s) {
|
|
if (filter.test(s)) probe.tell(s, ActorRef.noSender());
|
|
}
|
|
});
|
|
}
|
|
|
|
public static class System {
|
|
public final Println out;
|
|
|
|
public System(Println out) {
|
|
this.out = out;
|
|
}
|
|
|
|
public abstract static class Println {
|
|
public abstract void println(String s);
|
|
|
|
public void println(Object s) {
|
|
println(s.toString());
|
|
}
|
|
|
|
public void printf(String format, Object... args) {
|
|
println(String.format(format, args));
|
|
}
|
|
}
|
|
}
|
|
}
|