se.ugli.commons.Option Maven / Gradle / Ivy
package se.ugli.commons;
import java.util.NoSuchElementException;
public class Option {
@SuppressWarnings({ "rawtypes", "unchecked" })
public static Option apply(final T value) {
return new Option(value);
}
public static Option none() {
return apply(null);
}
private final T value;
private Option(final T value) {
this.value = value;
}
@Override
public boolean equals(final Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final Option other = (Option) obj;
if (value == null) {
if (other.value != null)
return false;
} else if (!value.equals(other.value))
return false;
return true;
}
public T get() {
if (isDefined())
return value;
throw new NoSuchElementException();
}
public T getOrElse(final T defaultValue) {
if (isDefined())
return defaultValue;
return defaultValue;
}
public T getOrNull() {
return getOrElse(null);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (value == null ? 0 : value.hashCode());
return result;
}
public boolean isDefined() {
return value != null;
}
@Override
public String toString() {
return "Option [value=" + value + "]";
}
}