javafx.beans.property.SetPropertyBase Maven / Gradle / Ivy
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package javafx.beans.property;
import com.sun.javafx.binding.SetExpressionHelper;
import java.lang.ref.WeakReference;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.WeakListener;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.ObservableSet;
import javafx.collections.SetChangeListener;
/**
* The class {@code SetPropertyBase} is the base class for a property
* wrapping an {@link javafx.collections.ObservableSet}.
*
* It provides all the functionality required for a property except for the
* {@link #getBean()} and {@link #getName()} methods, which must be implemented
* by extending classes.
*
* @see javafx.collections.ObservableSet
* @see SetProperty
*
* @param the type of the {@code Set} elements
* @since JavaFX 2.1
*/
public abstract class SetPropertyBase extends SetProperty {
private final SetChangeListener setChangeListener = change -> {
invalidateProperties();
invalidated();
fireValueChangedEvent(change);
};
private ObservableSet value;
private ObservableValue> observable = null;
private InvalidationListener listener = null;
private boolean valid = true;
private SetExpressionHelper helper = null;
private SizeProperty size0;
private EmptyProperty empty0;
/**
* The Constructor of {@code SetPropertyBase}
*/
public SetPropertyBase() {}
/**
* The constructor of the {@code SetPropertyBase}.
*
* @param initialValue
* the initial value of the wrapped value
*/
public SetPropertyBase(ObservableSet initialValue) {
this.value = initialValue;
if (initialValue != null) {
initialValue.addListener(setChangeListener);
}
}
@Override
public ReadOnlyIntegerProperty sizeProperty() {
if (size0 == null) {
size0 = new SizeProperty();
}
return size0;
}
private class SizeProperty extends ReadOnlyIntegerPropertyBase {
@Override
public int get() {
return size();
}
@Override
public Object getBean() {
return SetPropertyBase.this;
}
@Override
public String getName() {
return "size";
}
@Override
protected void fireValueChangedEvent() {
super.fireValueChangedEvent();
}
}
@Override
public ReadOnlyBooleanProperty emptyProperty() {
if (empty0 == null) {
empty0 = new EmptyProperty();
}
return empty0;
}
private class EmptyProperty extends ReadOnlyBooleanPropertyBase {
@Override
public boolean get() {
return isEmpty();
}
@Override
public Object getBean() {
return SetPropertyBase.this;
}
@Override
public String getName() {
return "empty";
}
@Override
protected void fireValueChangedEvent() {
super.fireValueChangedEvent();
}
}
@Override
public void addListener(InvalidationListener listener) {
helper = SetExpressionHelper.addListener(helper, this, listener);
}
@Override
public void removeListener(InvalidationListener listener) {
helper = SetExpressionHelper.removeListener(helper, listener);
}
@Override
public void addListener(ChangeListener> listener) {
helper = SetExpressionHelper.addListener(helper, this, listener);
}
@Override
public void removeListener(ChangeListener> listener) {
helper = SetExpressionHelper.removeListener(helper, listener);
}
@Override
public void addListener(SetChangeListener listener) {
helper = SetExpressionHelper.addListener(helper, this, listener);
}
@Override
public void removeListener(SetChangeListener listener) {
helper = SetExpressionHelper.removeListener(helper, listener);
}
/**
* Sends notifications to all attached
* {@link javafx.beans.InvalidationListener InvalidationListeners},
* {@link javafx.beans.value.ChangeListener ChangeListeners}, and
* {@link javafx.collections.SetChangeListener}.
*
* This method is called when the value is changed, either manually by
* calling {@link #set(javafx.collections.ObservableSet)} or in case of a bound property, if the
* binding becomes invalid.
*/
protected void fireValueChangedEvent() {
SetExpressionHelper.fireValueChangedEvent(helper);
}
/**
* Sends notifications to all attached
* {@link javafx.beans.InvalidationListener InvalidationListeners},
* {@link javafx.beans.value.ChangeListener ChangeListeners}, and
* {@link javafx.collections.SetChangeListener}.
*
* This method is called when the content of the list changes.
*
* @param change the change that needs to be propagated
*/
protected void fireValueChangedEvent(SetChangeListener.Change change) {
SetExpressionHelper.fireValueChangedEvent(helper, change);
}
private void invalidateProperties() {
if (size0 != null) {
size0.fireValueChangedEvent();
}
if (empty0 != null) {
empty0.fireValueChangedEvent();
}
}
private void markInvalid(ObservableSet oldValue) {
if (valid) {
if (oldValue != null) {
oldValue.removeListener(setChangeListener);
}
valid = false;
invalidateProperties();
invalidated();
fireValueChangedEvent();
}
}
/**
* The method {@code invalidated()} can be overridden to receive
* invalidation notifications. This is the preferred option in
* {@code Objects} defining the property, because it requires less memory.
*
* The default implementation is empty.
*/
protected void invalidated() {
}
@Override
public ObservableSet get() {
if (!valid) {
value = observable == null ? value : observable.getValue();
valid = true;
if (value != null) {
value.addListener(setChangeListener);
}
}
return value;
}
@Override
public void set(ObservableSet newValue) {
if (isBound()) {
throw new java.lang.RuntimeException((getBean() != null && getName() != null ?
getBean().getClass().getSimpleName() + "." + getName() + " : ": "") + "A bound value cannot be set.");
}
if (value != newValue) {
final ObservableSet oldValue = value;
value = newValue;
markInvalid(oldValue);
}
}
@Override
public boolean isBound() {
return observable != null;
}
@Override
public void bind(final ObservableValue> newObservable) {
if (newObservable == null) {
throw new NullPointerException("Cannot bind to null");
}
if (newObservable != this.observable) {
unbind();
observable = newObservable;
if (listener == null) {
listener = new Listener<>(this);
}
observable.addListener(listener);
markInvalid(value);
}
}
@Override
public void unbind() {
if (observable != null) {
value = observable.getValue();
observable.removeListener(listener);
observable = null;
}
}
/**
* Returns a string representation of this {@code SetPropertyBase} object.
* @return a string representation of this {@code SetPropertyBase} object.
*/
@Override
public String toString() {
final Object bean = getBean();
final String name = getName();
final StringBuilder result = new StringBuilder("SetProperty [");
if (bean != null) {
result.append("bean: ").append(bean).append(", ");
}
if ((name != null) && (!name.equals(""))) {
result.append("name: ").append(name).append(", ");
}
if (isBound()) {
result.append("bound, ");
if (valid) {
result.append("value: ").append(get());
} else {
result.append("invalid");
}
} else {
result.append("value: ").append(get());
}
result.append("]");
return result.toString();
}
private static class Listener implements InvalidationListener, WeakListener {
private final WeakReference> wref;
public Listener(SetPropertyBase ref) {
this.wref = new WeakReference<>(ref);
}
@Override
public void invalidated(Observable observable) {
SetPropertyBase ref = wref.get();
if (ref == null) {
observable.removeListener(this);
} else {
ref.markInvalid(ref.value);
}
}
@Override
public boolean wasGarbageCollected() {
return wref.get() == null;
}
}
}
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