Sublist.java

package java.util;

/**
 * Title:
 * Description:
 * Copyright:    Copyright (c) 2001
 * Company:
 * @version 1.0
 */

public class Sublist extends AbstractList

  {
        AbstractList m_al=null;
        int m_fromIndex=0;
        int m_toIndex=0;
        int size=0;

        public Sublist(AbstractList ali,int fromIndex,int toIndex)
            {
                 m_al=ali;
                m_toIndex=toIndex;
                m_fromIndex=fromIndex;
        size = size();
             }
    public Object set(int index,Object o)
          {
        if (index < size)
        {
          o = m_al.set(index+m_fromIndex,o);
          if (o != null)
            {
              size++;
              m_toIndex++;
            }
          return o;
        }
        else throw new IndexOutOfBoundsException();
      }

    public Object get(int index) throws IndexOutOfBoundsException
      {
        if (index < size)   return m_al.get(index+m_fromIndex);
        else throw new IndexOutOfBoundsException();
      }

    public void add (int index,Object o)
      {

        if (index <= size)
          {
            m_al.add(index + m_fromIndex,o);
            m_toIndex++;
            size++;

          }
        else   throw new IndexOutOfBoundsException();

      }

    public Object remove(int index,Object o)
      {
       if (index < size)
        {
          Object ob = m_al.remove(index + m_fromIndex);
          if (ob !=null)
          {
            m_toIndex--;
            size--;
          }
          return ob;
        }
      else throw new IndexOutOfBoundsException();
      }

    public boolean addAll(int index, Collection c)
      {
       if (index < size)
        {
          boolean bool = m_al.addAll(index + m_fromIndex,c);
          if (bool)
          {
            int lange = c.size();
            m_toIndex = m_toIndex + lange;
            size =  size + lange;
          }
          return bool;
        }
      else throw new IndexOutOfBoundsException();
      }

        public boolean addAll(Collection c)
      {
          boolean bool = m_al.addAll(m_toIndex,c);
          if (bool)
          {
            int lange = c.size();
            m_toIndex = m_toIndex + lange;
            size =  size + lange;
          }
          return bool;
      }

    public void removeRange (int from,int to)
      {
        if ((from <= to) && (from <= size) && (to <= size))
          {
            m_al.removeRange(from,to);
            int lange = to - from;
            m_toIndex = m_toIndex - lange;
            size = size - lange;
          }
        else
          {
            if (from > to) throw new IllegalArgumentException();
            else throw new IndexOutOfBoundsException();
          }
      }

    public int size()
    {
          return (m_toIndex - m_fromIndex);
    }

}