| /******************************************************************************* |
| * Copyright (c) 2008, 2015 Matthew Hall and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Matthew Hall - initial API and implementation (bug 194734) |
| * Matthew Hall - bug 262269 |
| * Stefan Xenos <sxenos@gmail.com> - Bug 335792 |
| ******************************************************************************/ |
| |
| package org.eclipse.core.internal.databinding.property.value; |
| |
| import java.lang.reflect.Array; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.ListIterator; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.IStaleListener; |
| import org.eclipse.core.databinding.observable.ObservableTracker; |
| import org.eclipse.core.databinding.observable.list.AbstractObservableList; |
| import org.eclipse.core.databinding.observable.list.IListChangeListener; |
| import org.eclipse.core.databinding.observable.list.IObservableList; |
| import org.eclipse.core.databinding.observable.list.ListChangeEvent; |
| import org.eclipse.core.databinding.observable.list.ListDiff; |
| import org.eclipse.core.databinding.observable.list.ListDiffEntry; |
| import org.eclipse.core.databinding.property.IPropertyObservable; |
| import org.eclipse.core.databinding.property.value.DelegatingValueProperty; |
| |
| /** |
| * @param <S> |
| * type of the source object |
| * @param <T> |
| * type of the value of the property |
| * @param <E> |
| * type of the elements in the list |
| * @since 1.2 |
| */ |
| public class ListDelegatingValueObservableList<S, T extends S, E> extends AbstractObservableList<E> |
| implements IPropertyObservable<DelegatingValueProperty<S, E>> { |
| private IObservableList<T> masterList; |
| private DelegatingValueProperty<S, E> detailProperty; |
| private DelegatingCache<S, T, E> cache; |
| |
| private IListChangeListener<T> masterListener = new IListChangeListener<T>() { |
| @Override |
| public void handleListChange(ListChangeEvent<? extends T> event) { |
| if (isDisposed()) |
| return; |
| |
| cache.addAll(masterList); |
| |
| // Need both obsolete and new elements to convert diff |
| ListDiff<E> diff = convertDiff(event.diff); |
| |
| cache.retainAll(masterList); |
| |
| fireListChange(diff); |
| } |
| |
| private ListDiff<E> convertDiff(ListDiff<? extends T> diff) { |
| // Convert diff to detail value |
| ListDiffEntry<? extends T>[] masterEntries = diff.getDifferences(); |
| List<ListDiffEntry<E>> detailEntries = new ArrayList<>(masterEntries.length); |
| for (ListDiffEntry<? extends T> masterDifference : masterEntries) { |
| int index = masterDifference.getPosition(); |
| boolean addition = masterDifference.isAddition(); |
| T masterElement = masterDifference.getElement(); |
| E detailValue = cache.get(masterElement); |
| |
| detailEntries.add(Diffs.createListDiffEntry(index, addition, detailValue)); |
| } |
| return Diffs.createListDiff(detailEntries); |
| } |
| }; |
| |
| private IStaleListener staleListener = staleEvent -> fireStale(); |
| |
| /** |
| * @param masterList |
| * @param valueProperty |
| */ |
| public ListDelegatingValueObservableList(IObservableList<T> masterList, |
| DelegatingValueProperty<S, E> valueProperty) { |
| super(masterList.getRealm()); |
| this.masterList = masterList; |
| this.detailProperty = valueProperty; |
| this.cache = new DelegatingCache<S, T, E>(getRealm(), valueProperty) { |
| @Override |
| void handleValueChange(T masterElement, E oldValue, E newValue) { |
| fireListChange(indicesOf(masterElement), oldValue, newValue); |
| } |
| }; |
| cache.addAll(masterList); |
| |
| masterList.addListChangeListener(masterListener); |
| masterList.addStaleListener(staleListener); |
| } |
| |
| @Override |
| protected int doGetSize() { |
| getterCalled(); |
| return masterList.size(); |
| } |
| |
| private void getterCalled() { |
| ObservableTracker.getterCalled(this); |
| } |
| |
| @Override |
| public E get(int index) { |
| getterCalled(); |
| T masterElement = masterList.get(index); |
| return cache.get(masterElement); |
| } |
| |
| @Override |
| public boolean add(Object o) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean addAll(Collection<? extends E> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean addAll(int index, Collection<? extends E> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean contains(Object o) { |
| getterCalled(); |
| return cache.containsValue(o); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| getterCalled(); |
| return masterList.isEmpty(); |
| } |
| |
| @Override |
| public boolean isStale() { |
| getterCalled(); |
| return masterList.isStale(); |
| } |
| |
| @Override |
| public Iterator<E> iterator() { |
| getterCalled(); |
| return new Iterator<E>() { |
| Iterator<T> it = masterList.iterator(); |
| |
| @Override |
| public boolean hasNext() { |
| getterCalled(); |
| return it.hasNext(); |
| } |
| |
| @Override |
| public E next() { |
| getterCalled(); |
| T masterElement = it.next(); |
| return cache.get(masterElement); |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| |
| @Override |
| public E move(int oldIndex, int newIndex) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean remove(Object o) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean removeAll(Collection<?> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean retainAll(Collection<?> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public Object[] toArray() { |
| getterCalled(); |
| Object[] masterElements = masterList.toArray(); |
| Object[] result = new Object[masterElements.length]; |
| for (int i = 0; i < result.length; i++) { |
| result[i] = cache.get(masterElements[i]); |
| } |
| return result; |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public <U> U[] toArray(U[] a) { |
| getterCalled(); |
| Object[] masterElements = masterList.toArray(); |
| if (a.length < masterElements.length) |
| a = (U[]) Array.newInstance(a.getClass().getComponentType(), masterElements.length); |
| for (int i = 0; i < masterElements.length; i++) { |
| a[i] = (U) cache.get(masterElements[i]); |
| } |
| return a; |
| } |
| |
| @Override |
| public void add(int index, Object o) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void clear() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public ListIterator<E> listIterator() { |
| return listIterator(0); |
| } |
| |
| @Override |
| public ListIterator<E> listIterator(final int index) { |
| getterCalled(); |
| return new ListIterator<E>() { |
| ListIterator<T> it = masterList.listIterator(index); |
| T lastMasterElement; |
| E lastElement; |
| boolean haveIterated = false; |
| |
| @Override |
| public void add(Object arg0) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| getterCalled(); |
| return it.hasNext(); |
| } |
| |
| @Override |
| public boolean hasPrevious() { |
| getterCalled(); |
| return it.hasPrevious(); |
| } |
| |
| @Override |
| public E next() { |
| getterCalled(); |
| lastMasterElement = it.next(); |
| lastElement = cache.get(lastMasterElement); |
| haveIterated = true; |
| return lastElement; |
| } |
| |
| @Override |
| public int nextIndex() { |
| getterCalled(); |
| return it.nextIndex(); |
| } |
| |
| @Override |
| public E previous() { |
| getterCalled(); |
| lastMasterElement = it.previous(); |
| lastElement = cache.get(lastMasterElement); |
| haveIterated = true; |
| return lastElement; |
| } |
| |
| @Override |
| public int previousIndex() { |
| getterCalled(); |
| return it.previousIndex(); |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void set(E o) { |
| checkRealm(); |
| if (!haveIterated) |
| throw new IllegalStateException(); |
| |
| cache.put(lastMasterElement, o); |
| |
| lastElement = o; |
| } |
| }; |
| } |
| |
| private int[] indicesOf(Object masterElement) { |
| List<Integer> indices = new ArrayList<>(); |
| |
| for (ListIterator<T> it = masterList.listIterator(); it.hasNext();) { |
| if (masterElement == it.next()) |
| indices.add(Integer.valueOf(it.previousIndex())); |
| } |
| |
| int[] result = new int[indices.size()]; |
| for (int i = 0; i < result.length; i++) { |
| result[i] = indices.get(i).intValue(); |
| } |
| return result; |
| } |
| |
| private void fireListChange(int[] indices, E oldValue, E newValue) { |
| List<ListDiffEntry<E>> differences = new ArrayList<>(indices.length * 2); |
| for (int index : indices) { |
| differences.add(Diffs.createListDiffEntry(index, false, oldValue)); |
| differences.add(Diffs.createListDiffEntry(index, true, newValue)); |
| } |
| fireListChange(Diffs.createListDiff(differences)); |
| } |
| |
| @Override |
| public E remove(int index) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public E set(int index, E o) { |
| checkRealm(); |
| T masterElement = masterList.get(index); |
| return cache.put(masterElement, o); |
| } |
| |
| @Override |
| public Object getObserved() { |
| return masterList; |
| } |
| |
| @Override |
| public DelegatingValueProperty<S, E> getProperty() { |
| return detailProperty; |
| } |
| |
| @Override |
| public Object getElementType() { |
| return detailProperty.getValueType(); |
| } |
| |
| @Override |
| public synchronized void dispose() { |
| if (masterList != null) { |
| masterList.removeListChangeListener(masterListener); |
| masterList.removeStaleListener(staleListener); |
| masterList = null; |
| } |
| |
| if (cache != null) { |
| cache.dispose(); |
| cache = null; |
| } |
| |
| masterListener = null; |
| detailProperty = null; |
| |
| super.dispose(); |
| } |
| } |