Source code: jtemporal/util/ReadOnlySet.java

   package jtemporal.util;
   
   import java.util.*;
   import java.io.Serializable;
   
   
   /**
    * Set proxy, restricting operations to read-only.  <BR>
    * <B>For methods description, see java.util.Set</B>
   * @author Thomas Beck
   * @version $Id$
   */
  
  public class ReadOnlySet implements Set, Serializable {
  
    private static final String ERROR_MSG = "This Set is read-only";
    private static final long serialVersionUID = 9826560106639L;
  
    private final Set remoteSet;
  
    public ReadOnlySet(Set s) {
      this.remoteSet = s;
    }
    public boolean contains(Object o) {
      return remoteSet.contains(o);
    }
    public boolean remove(Object o) {
      throw new UnsupportedOperationException(ERROR_MSG);
    }
    public Object[] toArray(Object[] parm1) {
      return remoteSet.toArray(parm1);
    }
    public boolean isEmpty() {
      return remoteSet.isEmpty();
    }
    public int size() {
      return remoteSet.size();
    }
    public boolean containsAll(Collection c) {
      return remoteSet.containsAll(c);
    }
    public Object[] toArray() {
      return remoteSet.toArray();
    }
  
  
    public boolean retainAll(Collection parm1) {
      throw new UnsupportedOperationException(ERROR_MSG);
    }
    public boolean add(Object o) {
      throw new UnsupportedOperationException(ERROR_MSG);
    }
    public void clear() {
      throw new UnsupportedOperationException(ERROR_MSG);
    }
    public Iterator iterator() {
      return new Iterator() {
        private final Iterator remoteIterator = ReadOnlySet.this.remoteSet.iterator();
        public boolean hasNext() {
          return remoteIterator.hasNext();
        }
        public Object next() {
          return remoteIterator.next();
        }
        public void remove() {
          throw new UnsupportedOperationException(ReadOnlySet.ERROR_MSG);
        }
      };
    }
    public boolean addAll(Collection parm1) {
      throw new UnsupportedOperationException(ERROR_MSG);
    }
    public boolean removeAll(Collection parm1) {
      throw new UnsupportedOperationException(ERROR_MSG);
    }
  }