Created
April 11, 2018 20:47
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package com.company; | |
import java.util.Optional; | |
import java.util.function.Function; | |
class Validity { } | |
class Valid extends Validity { } | |
class Invalid extends Validity { } | |
class EventDescription<TValid extends Validity> { | |
private final String data; | |
private EventDescription(String data) { | |
this.data = data; | |
} | |
public String get() { | |
return data; | |
} | |
public EventDescription<Invalid> map(Function<String, String> mapper) { | |
return new EventDescription<>(mapper.apply(data)); | |
} | |
public Optional<EventDescription<Valid>> validate() { | |
if (this.data.contains("<script>")) { | |
return Optional.empty(); | |
} else { | |
return Optional.of(new EventDescription<>(this.data)); | |
} | |
} | |
public static EventDescription<Invalid> create(String data) { | |
return new EventDescription<>(data); | |
} | |
} | |
class EventAPI { | |
public static void createEvent(EventDescription<Valid> description) { | |
// value is guaranteed to be valid | |
String value = description.get(); | |
} | |
} | |
public class Main { | |
public static void main(String[] args) { | |
EventDescription<Invalid> description = EventDescription.create("hello"); | |
description.validate().ifPresent(EventAPI::createEvent); | |
} | |
} |
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