/
UnionEObjectEList.java
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/
UnionEObjectEList.java
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/*
* Copyright (c) 2005, 2018 IBM Corporation, CEA, and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v20.html
*
* Contributors:
* IBM - initial API and implementation
* Kenn Hussey - 286329, 398462, 535301
* Christian W. Damus (CEA) - 398462
* Kenn Hussey (CEA) - 212765, 403365, 420938, 421756, 432921
*/
package org.eclipse.uml2.common.util;
import java.util.Collection;
import java.util.Iterator;
import java.util.ListIterator;
import org.eclipse.emf.common.notify.NotificationChain;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.InternalEObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.util.EcoreEList;
/**
* An unmodifiable list that represents a union of elements. This list is ideal
* for implementing derived features whose values are obtained from the values
* of other features in a non-trivial way.
*/
public class UnionEObjectEList<E>
extends EcoreEList.UnmodifiableEList<E> {
private static final long serialVersionUID = 1L;
public UnionEObjectEList(InternalEObject owner,
EStructuralFeature eStructuralFeature, int size, Object[] data) {
super(owner, eStructuralFeature, size, data);
}
protected EObject resolveProxy(EObject eObject) {
return eObject.eIsProxy()
? owner.eResolveProxy((InternalEObject) eObject)
: eObject;
}
@SuppressWarnings("unchecked")
@Override
protected E resolve(int index, E object) {
E resolved = (E) resolveProxy((EObject) object);
if (resolved != object) {
E oldObject = (E) data[index];
assign(index, validate(index, resolved));
didSet(index, resolved, oldObject);
return resolved;
} else {
return object;
}
}
@Override
protected boolean canContainNull() {
return false;
}
@Override
protected boolean isUnique() {
return true;
}
@Override
protected boolean useEquals() {
return false;
}
@Override
public boolean contains(Object object) {
boolean result = super.contains(object);
if (!result) {
for (int i = 0; i < size; i++) {
if (resolveProxy((EObject) data[i]) == object) {
return true;
}
}
}
return result;
}
@Override
public int indexOf(Object object) {
int result = super.indexOf(object);
if (result == -1) {
for (int i = 0; i < size; i++) {
if (resolveProxy((EObject) data[i]) == object) {
return i;
}
}
}
return result;
}
@Override
public int lastIndexOf(Object object) {
int result = super.lastIndexOf(object);
if (result == -1) {
for (int i = size - 1; i >= 0; i--) {
if (resolveProxy((EObject) data[i]) == object) {
return i;
}
}
}
return result;
}
@Override
public Iterator<E> iterator() {
return listIterator();
}
@SuppressWarnings("deprecation")
@Override
public ListIterator<E> listIterator() {
return new EListIterator<E>();
}
@SuppressWarnings("deprecation")
@Override
public ListIterator<E> listIterator(int index) {
if (index < 0 || index > size()) {
throw new BasicIndexOutOfBoundsException(index, size);
}
return new EListIterator<E>(index);
}
protected boolean isLoading() {
Resource.Internal eInternalResource = owner.eInternalResource();
return eInternalResource != null && eInternalResource.isLoading();
}
@Override
public NotificationChain basicRemove(Object object,
NotificationChain notifications) {
return isLoading()
? notifications
: super.basicRemove(object, notifications);
}
@Override
public NotificationChain basicAdd(E object, NotificationChain notifications) {
return isLoading()
? notifications
: super.basicAdd(object, notifications);
}
@Override
public boolean add(E object) {
return false;
}
@Override
public void add(int index, E object) {
// do nothing
}
@Override
public void clear() {
// do nothing
}
@Override
public void move(int index, E object) {
// do nothing
}
@Override
public void addUnique(E object) {
// do nothing
}
@Override
public void addUnique(int index, E object) {
// do nothing
}
@Override
public boolean addAllUnique(int index, Collection<? extends E> collection) {
return false;
}
@Override
public E move(int targetIndex, int sourceIndex) {
return null;
}
@Override
public E remove(int index) {
return null;
}
@Override
public boolean addAllUnique(Collection<? extends E> collection) {
return false;
}
}