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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.lang;
import java.util.NoSuchElementException;
import java.util.Optional;
/**
* An optional which contains a settable value
*
* @author bratseth
*/
public final class SettableOptional<T> {
private T value = null;
/** Creates a new empty settable optional */
public SettableOptional() {}
/** Creates a new settable optional with the given value */
public SettableOptional(T value) { this.value = value; }
/** Creates a new settable optional with the given value, or an empty */
public SettableOptional(Optional<T> value) {
this.value = value.orElse(null);
}
public boolean isPresent() {
return value != null;
}
public T get() {
if (value == null)
throw new NoSuchElementException("No value present");
return value;
}
public void set(T value) {
this.value = value;
}
public void set(Optional<T> value) {
this.value = value.orElse(null);
}
public Optional<T> asOptional() {
if (value == null) return Optional.empty();
return Optional.of(value);
}
}
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