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package java.util;
import java.io.Serializable;
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, Serializable
{
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 UnsupportedOperationException();
}
};
}
public boolean add(Object o)
{
throw new UnsupportedOperationException();
}
public boolean remove(Object o)
{
throw new UnsupportedOperationException();
}
public boolean containsAll(Collection coll)
{
return c.containsAll(coll);
}
public boolean addAll(Collection coll)
{
throw new UnsupportedOperationException();
}
public boolean removeAll(Collection coll)
{
throw new UnsupportedOperationException();
}
public boolean retainAll(Collection coll)
{
throw new UnsupportedOperationException();
}
public void clear()
{
throw new UnsupportedOperationException();
}
public String toString()
{
return c.toString();
}
}
public static Set unmodifiableSet(Set s)
{
return new UnmodifiableSet(s);
}
static class UnmodifiableSet extends UnmodifiableCollection
implements Set, Serializable
{
UnmodifiableSet(Set s)
{
super(s);
}
public boolean equals(Object o)
{
return c.equals(o);
}
public int hashCode()
{
return c.hashCode();
}
}
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 UnsupportedOperationException();
}
public void add(int index, Object element)
{
throw new UnsupportedOperationException();
}
public Object remove(int index)
{
throw new UnsupportedOperationException();
}
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 UnsupportedOperationException();
}
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 UnsupportedOperationException();
}
public void set(Object o)
{
throw new UnsupportedOperationException();
}
public void add(Object o)
{
throw new UnsupportedOperationException();
}
};
}
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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