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package bezier;
import java.util.LinkedList;
import java.util.List;
import java.util.function.Consumer;
/**
* Dummy class for holding a value, and being notified when it changes.
*
* Essentially a pointer with change notifications.
*
* @author bjculkin
*
* @param <E>
* The type of held value.
*/
public class Holder<E> {
/*
* The held value.
*/
private E val;
/*
* The listeners to notify.
*/
private final List<Consumer<E>> listeners;
/**
* Create a new holder holding nothing.
*/
public Holder() {
listeners = new LinkedList<>();
}
/**
* Create a new holder holding a specific value.
*
* @param val
* The value being held.
*/
public Holder(E val) {
this();
this.val = val;
}
/**
* Get the contained value.
*
* @return The contained value.
*/
public E getVal() {
return val;
}
/**
* Set the contained value, and notify listeners.
*
* @param val
* The new value.
*/
public void setVal(E val) {
this.val = val;
/*
* Notify listeners.
*/
for (Consumer<E> listen : listeners) {
listen.accept(val);
}
}
/**
* Add a listener.
*
* @param listen
* The listener to add.
*/
public void addHolderListener(Consumer<E> listen) {
listeners.add(listen);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((val == null) ? 0 : val.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Holder<?> other = (Holder<?>) obj;
if (val == null) {
if (other.val != null)
return false;
} else if (!val.equals(other.val))
return false;
return true;
}
@Override
public String toString() {
return "Holder [val=" + val + "]";
}
}
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