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/*
* Created on Dec 8, 2003
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
package net.israfil.foundation.valuemodel;
import java.util.HashMap;
import java.util.Map;
import net.israfil.foundation.dynamic.DynamicUtil;
/**
* @author cgruber
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
public class ValueHolder<E> implements MutableValue<E> {
private E _value = null;
private Map<Integer, ObserverHolder> _observers = new HashMap<>();
private Map<Integer, VetoerHolder> _vetoers = new HashMap<>();
public ValueHolder(E o) {
set(o);
}
protected ValueHolder() { }
@Override
public E get() {
return _value;
}
@Override
public void set(E newValue) {
boolean approved = true;
E oldValue = _value;
for (VetoerHolder vetoer : _vetoers.values()) {
approved &= vetoer.evaluate(this, oldValue, newValue);
}
if (!approved) return;
else _value = newValue;
for (ObserverHolder observer : _observers.values()) {
observer.notify(this, oldValue, newValue);
}
}
/**
* @see org.israfil.maveric.Observable#addObserver(java.lang.Object, java.lang.String)
*/
@Override
public void addObservers(String callback, Object ... observers) {
for (Object observer : observers) {
_observers.put(observer.hashCode(),new ObserverHolder(observer,callback));
}
}
/**
* @see org.israfil.maveric.Observable#removeObserver(java.lang.Object)
*/
@Override
public void removeObservers(Object ... observers) {
for (Object observer : observers) {
_observers.remove(observer.hashCode());
}
}
/**
* @see org.israfil.maveric.Vetoable#addVetoer(java.lang.Object, java.lang.String)
*/
@Override
public void addVetoers(String callback, Object ... vetoers) {
for (Object vetoer : vetoers) {
_vetoers.put(vetoer.hashCode(),new VetoerHolder(vetoer,callback));
}
}
/**
* @see org.israfil.maveric.Vetoable#removeVetoer(java.lang.Object)
*/
@Override
public void removeVetoers(Object ... vetoers) {
for (Object vetoer : vetoers) {
_vetoers.remove(vetoer.hashCode());
}
}
protected class CallbackObjectHolder {
public final Object receiver;
protected final String callback;
public CallbackObjectHolder(Object receiver, String callback) {
this.receiver = receiver;
this.callback = callback;
}
}
protected class ObserverHolder extends CallbackObjectHolder {
public ObserverHolder(Object observer, String callback) { super(observer, callback); }
public void notify(Object notifier, Object oldValue, Object newValue) {
DynamicUtil.performOn(receiver,callback,new Object[]{notifier, oldValue , newValue});
}
}
protected class VetoerHolder extends CallbackObjectHolder {
public VetoerHolder(Object vetoer, String callback) { super(vetoer, callback); }
public Boolean evaluate(Object notifier, Object oldValue, Object newValue) {
Boolean result = (Boolean)DynamicUtil.performOn(receiver,callback,new Object[]{notifier,oldValue,newValue});
return (result == null) ? true : result.booleanValue();
}
}
}
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