package com.planet_ink.coffee_mud.core.collections; import java.util.*; /* Copyright 2010-2019 Bo Zimmerman Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ public class ReadOnlyCollection<K> implements Collection<K> { private final Collection<K> col; public ReadOnlyCollection(final Collection<K> c) { col=c; } @Override public boolean add(final K e) { throw new java.lang.IllegalArgumentException(); } @Override public boolean addAll(final Collection<? extends K> c) { throw new java.lang.IllegalArgumentException(); } @Override public void clear() { throw new java.lang.IllegalArgumentException(); } @Override public boolean contains(final Object o) { return col.contains(o); } @Override public boolean containsAll(final Collection<?> c) { return col.containsAll(c); } @Override public boolean isEmpty() { return col.isEmpty(); } @Override public Iterator<K> iterator() { return new ReadOnlyIterator<K>(col.iterator()); } @Override public boolean remove(final Object o) { throw new java.lang.IllegalArgumentException(); } @Override public boolean removeAll(final Collection<?> c) { throw new java.lang.IllegalArgumentException(); } @Override public boolean retainAll(final Collection<?> c) { throw new java.lang.IllegalArgumentException(); } @Override public int size() { return col.size(); } @Override public Object[] toArray() { return col.toArray(); } @Override public <T> T[] toArray(final T[] a) { return col.toArray(a); } }