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package java.util;
public class Collections
{
public static List EMPTY_LIST = new ArrayList();
private Collections()
{
}
public static Collection unmodifiableCollection(Collection c)
{
return new UnmodifiableCollection(c);
}
static class UnmodifiableCollection
implements Collection
{
Collection c;
UnmodifiableCollection(Collection c)
{
this.c = c;
}
public int size()
{
return c.size();
}
public boolean isEmpty()
{
return c.isEmpty();
}
public boolean contains(Object o)
{
return c.contains(o);
}
public Object[] toArray()
{
return c.toArray();
}
public Object[] toArray(Object[] a)
{
return c.toArray(a);
}
public Iterator iterator()
{
return new Iterator()
{
Iterator i = c.iterator();
public boolean hasNext()
{
return i.hasNext();
}
public Object next()
{
return i.next();
}
public void remove()
{
throw new RuntimeException();
}
};
}
public boolean add(Object o)
{
throw new RuntimeException();
}
public boolean remove(Object o)
{
throw new RuntimeException();
}
public boolean containsAll(Collection coll)
{
return c.containsAll(coll);
}
public boolean addAll(Collection coll)
{
throw new RuntimeException();
}
public boolean removeAll(Collection coll)
{
throw new RuntimeException();
}
public boolean retainAll(Collection coll)
{
throw new RuntimeException();
}
public void clear()
{
throw new RuntimeException();
}
public String toString()
{
return c.toString();
}
}
public static Set unmodifiableSet(Set s)
{
return new UnmodifiableSet(s);
}
static class UnmodifiableSet
extends UnmodifiableCollection
implements Set
{
UnmodifiableSet(Set s)
{
super(s);
}
public boolean equals(Object o)
{
return c.equals(o);
}
public int hashCode()
{
return c.hashCode();
}
}
public static Map unmodifiableMap(Map map)
{
return new UnmodifiableMap(map);
}
static class UnmodifiableMap
implements Map
{
private Map map;
UnmodifiableMap(Map map)
{
this.map = map;
}
public int size()
{
return map.size();
}
public boolean isEmpty()
{
return map.isEmpty();
}
public boolean containsKey(Object key)
throws ClassCastException, NullPointerException
{
return map.containsKey(key);
}
public boolean containsValue(Object value)
{
return map.containsValue(value);
}
public Object get(Object key)
throws ClassCastException, NullPointerException
{
return map.get(key);
}
public Object put(Object key, Object value)
throws RuntimeException, ClassCastException, IllegalArgumentException, NullPointerException
{
throw new RuntimeException("unsupported operation - map unmodifiable");
}
public Object remove(Object key)
throws RuntimeException
{
throw new RuntimeException("unsupported operation - map unmodifiable");
}
public void putAll(Map t)
throws RuntimeException, ClassCastException, IllegalArgumentException, NullPointerException
{
throw new RuntimeException("unsupported operation - map unmodifiable");
}
public void clear()
throws RuntimeException
{
throw new RuntimeException("unsupported operation - map unmodifiable");
}
public Set keySet()
{
return map.keySet();
}
public Collection values()
{
return map.values();
}
public Set entrySet()
{
return map.entrySet();
}
}
public static List unmodifiableList(List list)
{
return new UnmodifiableList(list);
}
static class UnmodifiableList
extends UnmodifiableCollection
implements List
{
private List list;
UnmodifiableList(List list)
{
super(list);
this.list = list;
}
public boolean equals(Object o)
{
return list.equals(o);
}
public int hashCode()
{
return list.hashCode();
}
public Object get(int index)
{
return list.get(index);
}
public Object set(int index, Object element)
{
throw new RuntimeException();
}
public void add(int index, Object element)
{
throw new RuntimeException();
}
public Object remove(int index)
{
throw new RuntimeException();
}
public int indexOf(Object o)
{
return list.indexOf(o);
}
public int lastIndexOf(Object o)
{
return list.lastIndexOf(o);
}
public boolean addAll(int index, Collection c)
{
throw new RuntimeException();
}
public ListIterator listIterator()
{
return listIterator(0);
}
public ListIterator listIterator(final int index)
{
return new ListIterator()
{
ListIterator i = list.listIterator(index);
public boolean hasNext()
{
return i.hasNext();
}
public Object next()
{
return i.next();
}
public boolean hasPrevious()
{
return i.hasPrevious();
}
public Object previous()
{
return i.previous();
}
public int nextIndex()
{
return i.nextIndex();
}
public int previousIndex()
{
return i.previousIndex();
}
public void remove()
{
throw new RuntimeException();
}
public void set(Object o)
{
throw new RuntimeException();
}
public void add(Object o)
{
throw new RuntimeException();
}
};
}
public List subList(int fromIndex, int toIndex)
{
return new UnmodifiableList(list.subList(fromIndex, toIndex));
}
}
public static Enumeration enumeration(final Collection c)
{
return new Enumeration()
{
Iterator i = c.iterator();
public boolean hasMoreElements()
{
return i.hasNext();
}
public Object nextElement()
{
return i.next();
}
};
}
}
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