bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/ImmutableCollection.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.utils.datastructures;
  13
  14 import java.util.Collection;
  15 import java.util.Iterator;
  16
  17 public abstract class ImmutableCollection<T> implements Collection<T> {
  18
  19         public boolean add(T e) {
  20                 throw new UnsupportedOperationException();
  21         }
  22
  23         public boolean addAll(Collection<? extends T> c) {
  24                 throw new UnsupportedOperationException();
  25         }
  26
  27         public void clear() {
  28                 throw new UnsupportedOperationException();
  29         }
  30
  31         public boolean remove(Object o) {
  32                 throw new UnsupportedOperationException();
  33         }
  34
  35         public boolean removeAll(Collection<?> c) {
  36                 throw new UnsupportedOperationException();
  37         }
  38
  39         public boolean retainAll(Collection<?> c) {
  40                 throw new UnsupportedOperationException();
  41         }
  42
  43         abstract public boolean contains(Object o);
  44         abstract public boolean containsAll(Collection<?> c);
  45         abstract public boolean isEmpty();
  46         abstract public Iterator<T> iterator();
  47         abstract public int size();
  48
  49         public Object[] toArray() {
  50                 Object[] ret = new Object[size()];
  51                 int i=0;
  52                 for(T a : this)
  53                         ret[i++] = a;
  54                 return ret;
  55         }
  56
  57         public <U> U[] toArray(U[] a) {
  58                 // TODO
  59                 throw new UnsupportedOperationException();
  60         }
  61
  62 }