| /* |
| * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.corba.se.impl.ior ; |
| |
| import java.util.Collection ; |
| import java.util.List ; |
| import java.util.AbstractList ; |
| import java.util.ListIterator ; |
| import java.util.Iterator ; |
| |
| import com.sun.corba.se.spi.ior.MakeImmutable ; |
| |
| /** Simple class that delegates all List operations to |
| * another list. It also can be frozen, which means that |
| * a number of operations can be performed on the list, |
| * and then the list can be made immutable, so that no |
| * further changes are possible. A FreezableList is frozen |
| * using the makeImmutable method. |
| */ |
| public class FreezableList extends AbstractList { |
| private List delegate = null ; |
| private boolean immutable = false ; |
| |
| public boolean equals( Object obj ) |
| { |
| if (obj == null) |
| return false ; |
| |
| if (!(obj instanceof FreezableList)) |
| return false ; |
| |
| FreezableList other = (FreezableList)obj ; |
| |
| return delegate.equals( other.delegate ) && |
| (immutable == other.immutable) ; |
| } |
| |
| public int hashCode() |
| { |
| return delegate.hashCode() ; |
| } |
| |
| public FreezableList( List delegate, boolean immutable ) |
| { |
| this.delegate = delegate ; |
| this.immutable = immutable ; |
| } |
| |
| public FreezableList( List delegate ) |
| { |
| this( delegate, false ) ; |
| } |
| |
| public void makeImmutable() |
| { |
| immutable = true ; |
| } |
| |
| public boolean isImmutable() |
| { |
| return immutable ; |
| } |
| |
| public void makeElementsImmutable() |
| { |
| Iterator iter = iterator() ; |
| while (iter.hasNext()) { |
| Object obj = iter.next() ; |
| if (obj instanceof MakeImmutable) { |
| MakeImmutable element = (MakeImmutable)obj ; |
| element.makeImmutable() ; |
| } |
| } |
| } |
| |
| // Methods overridden from AbstractList |
| |
| public int size() |
| { |
| return delegate.size() ; |
| } |
| |
| public Object get(int index) |
| { |
| return delegate.get(index) ; |
| } |
| |
| public Object set(int index, Object element) |
| { |
| if (immutable) |
| throw new UnsupportedOperationException() ; |
| |
| return delegate.set(index, element) ; |
| } |
| |
| public void add(int index, Object element) |
| { |
| if (immutable) |
| throw new UnsupportedOperationException() ; |
| |
| delegate.add(index, element) ; |
| } |
| |
| public Object remove(int index) |
| { |
| if (immutable) |
| throw new UnsupportedOperationException() ; |
| |
| return delegate.remove(index) ; |
| } |
| |
| // We also override subList so that the result is a FreezableList. |
| public List subList(int fromIndex, int toIndex) |
| { |
| List list = delegate.subList(fromIndex, toIndex) ; |
| List result = new FreezableList( list, immutable ) ; |
| return result ; |
| } |
| } |