com.sun.javafx.collections.ObservableSetWrapper Maven / Gradle / Ivy
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.javafx.collections;
import javafx.beans.InvalidationListener;
import javafx.collections.ObservableSet;
import javafx.collections.SetChangeListener;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
/**
* A Set wrapper class that implements observability.
*/
public class ObservableSetWrapper implements ObservableSet {
private final Set backingSet;
private SetListenerHelper listenerHelper;
/**
* Creates new instance of ObservableSet that wraps
* the particular set specified by the parameter set.
*
* @param set the set being wrapped
*/
public ObservableSetWrapper(Set set) {
this.backingSet = set;
}
private class SimpleAddChange extends SetChangeListener.Change {
private final E added;
public SimpleAddChange(E added) {
super(ObservableSetWrapper.this);
this.added = added;
}
@Override
public boolean wasAdded() {
return true;
}
@Override
public boolean wasRemoved() {
return false;
}
@Override
public E getElementAdded() {
return added;
}
@Override
public E getElementRemoved() {
return null;
}
@Override
public String toString() {
return "added " + added;
}
}
private class SimpleRemoveChange extends SetChangeListener.Change {
private final E removed;
public SimpleRemoveChange(E removed) {
super(ObservableSetWrapper.this);
this.removed = removed;
}
@Override
public boolean wasAdded() {
return false;
}
@Override
public boolean wasRemoved() {
return true;
}
@Override
public E getElementAdded() {
return null;
}
@Override
public E getElementRemoved() {
return removed;
}
@Override
public String toString() {
return "removed " + removed;
}
}
private void callObservers(SetChangeListener.Change change) {
SetListenerHelper.fireValueChangedEvent(listenerHelper, change);
}
/**
* {@inheritDoc}
*/
@Override
public void addListener(InvalidationListener listener) {
listenerHelper = SetListenerHelper.addListener(listenerHelper, listener);
}
/**
* {@inheritDoc}
*/
@Override
public void removeListener(InvalidationListener listener) {
listenerHelper = SetListenerHelper.removeListener(listenerHelper, listener);
}
/**
* {@inheritDoc}
*/
@Override
public void addListener(SetChangeListener observer) {
listenerHelper = SetListenerHelper.addListener(listenerHelper, observer);
}
/**
* {@inheritDoc}
*/
@Override
public void removeListener(SetChangeListener observer) {
listenerHelper = SetListenerHelper.removeListener(listenerHelper, observer);
}
/**
* Returns number of elements contained in this set.
*
* @see java.util.Set in JDK API documentation
* @return number of elements contained in the set
*/
@Override
public int size() {
return backingSet.size();
}
/**
* Returns true if this set contains no elements.
*
* @see java.util.Set in JDK API documentation
* @return true if this set contains no elements
*/
@Override
public boolean isEmpty() {
return backingSet.isEmpty();
}
/**
* Returns true if this set contains specified element.
*
* @see java.util.Set in JDK API documentation
* @param o an element that is being looked for
* @return true if this set contains specified element
*/
@Override
public boolean contains(Object o) {
return backingSet.contains(o);
}
/**
* Returns an iterator over the elements in this set.
* If the iterator's remove() method is called then the
* registered observers are called as well.
*
* @see java.util.Set in JDK API documentation
* @return an iterator over the elements in this set
*/
@Override
public Iterator iterator() {
return new Iterator<>() {
private final Iterator backingIt = backingSet.iterator();
private E lastElement;
@Override
public boolean hasNext() {
return backingIt.hasNext();
}
@Override
public E next() {
lastElement = backingIt.next();
return lastElement;
}
@Override
public void remove() {
backingIt.remove();
callObservers(new SimpleRemoveChange(lastElement));
}
};
}
/**
* Returns an array containing all of the elements in this set.
*
* @see java.util.Set in JDK API documentation
* @return an array containing all of the elements in this set
*/
@Override
public Object[] toArray() {
return backingSet.toArray();
}
/**
* Returns an array containing all of the elements in this set.
* The runtime type of the returned array is that of the specified array.
*
* @see java.util.Set in JDK API documentation
* @param a the array into which the elements of this set are to be stored, if it is big enough;
* otherwise, a new array of the same runtime type is allocated
* @return an array containing all of the elements in this set
*/
@Override
public T[] toArray(T[] a) {
return backingSet.toArray(a);
}
/**
* Adds the specific element into this set and call all the
* registered observers unless the set already contains the element.
* Returns true in the case the element was added to the set.
*
* @see java.util.Set in JDK API documentation
* @param o the element to be added to the set
* @return true if the element was added
*/
@Override
public boolean add(E o) {
boolean ret = backingSet.add(o);
if (ret) {
callObservers(new SimpleAddChange(o));
}
return ret;
}
/**
* Removes the specific element from this set and call all the
* registered observers if the set contained the element.
* Returns true in the case the element was removed from the set.
*
* @see java.util.Set in JDK API documentation
* @param o the element to be removed from the set
* @return true if the element was removed
*/
@Override
public boolean remove(Object o) {
boolean ret = backingSet.remove(o);
if (ret) {
callObservers(new SimpleRemoveChange((E)o));
}
return ret;
}
/**
* Test this set if it contains all the elements in the specified collection.
* In such case returns true.
*
* @see java.util.Set in JDK API documentation
* @param c collection to be checked for containment in this set
* @return true if the set contains all the elements in the specified collection
*/
@Override
public boolean containsAll(Collection c) {
return backingSet.containsAll(c);
}
/**
* Adds the elements from the specified collection.
* Observers are called for each elements that was not already
* present in the set.
*
* @see java.util.Set in JDK API documentation
* @param c collection containing elements to be added to this set
* @return true if this set changed as a result of the call
*/
@Override
public boolean addAll(Collection c) {
boolean ret = false;
for (E element : c) {
ret |= add(element);
}
return ret;
}
/**
* Keeps only elements that are included in the specified collection.
* All other elements are removed. For each removed element all the
* observers are called.
*
* @see java.util.Set
* @param c collection containing elements to be kept in this set
* @return true if this set changed as a result of the call
*/
@Override
public boolean retainAll(Collection c) {
// implicit check to ensure c != null
if (c.isEmpty() && !backingSet.isEmpty()) {
clear();
return true;
}
if (backingSet.isEmpty()) {
return false;
}
return removeRetain(c, false);
}
/**
* Removes all the elements that are contained in the specified
* collection. Observers are called for each removed element.
*
* @see java.util.Set in JDK API documentation
* @param c collection containing elements to be removed from this set
* @return true if this set changed as a result of the call
*/
@Override
public boolean removeAll(Collection c) {
// implicit check to ensure c != null
if (c.isEmpty() || backingSet.isEmpty()) {
return false;
}
return removeRetain(c, true);
}
private boolean removeRetain(Collection c, boolean remove) {
boolean removed = false;
for (Iterator i = backingSet.iterator(); i.hasNext();) {
E element = i.next();
if (remove == c.contains(element)) {
removed = true;
i.remove();
callObservers(new SimpleRemoveChange(element));
}
}
return removed;
}
/**
* Removes all the elements from this set. Observers are called
* for each element.
* @see java.util.Set in JDK API documentation
*/
@Override
public void clear() {
for (Iterator i = backingSet.iterator(); i.hasNext(); ) {
E element = i.next();
i.remove();
callObservers(new SimpleRemoveChange(element));
}
}
/**
* Returns the String representation of the wrapped set.
* @see java.lang.Object in JDK API documentation
* @return the String representation of the wrapped set
*/
@Override
public String toString() {
return backingSet.toString();
}
/**
* Indicates whether some other object is "equal to" the wrapped set.
* @see java.lang.Object in JDK API documentation
* @param obj the reference object with which to compare
* @return true if the wrapped is equal to the obj argument
*/
@Override
public boolean equals(Object obj) {
return backingSet.equals(obj);
}
/**
* Returns the hash code for the wrapped set.
* @see java.lang.Object in JDK API documentation
* @return the hash code for the wrapped set
*/
@Override
public int hashCode() {
return backingSet.hashCode();
}
}
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