package org.odmg;

/**
 * The ODMG List collection.
 * A <code>DList</code> collection is an ordered collection that provides
 * efficient insertion and removal of elements at arbitrary positions in the
 * list, but it also supports indexed access. The beginning index value is 0.
 * When an element is added at a given position in the list, the index of all
 * subsequent elements is increased by 1. Similarly, when an element is removed
 * from the list, the index of all subsequent elements is decreased by 1.
 * <p>
 * All of the operations defined by the JavaSoft <code>List</code>
 * interface are supported by an ODMG implementation of <code>DList</code>,
 * the exception <code>UnsupportedOperationException</code> is not thrown when a
 * call is made to any of the <code>List</code> methods.
 * @author	David Jordan (as Java Editor of the Object Data Management Group)
 * @version ODMG 3.0
 */
// * @see com.sun.java.util.collections.UnsupportedOperationException

public interface DList extends DCollection, java.util.List
{
    /**
     * Creates a new <code>DList</code> object that contains the contents of this
     * <code>DList</code> object concatenated
     * with the contents of the <code>otherList</code> object.
     * @param	otherList	The list whose elements are placed at the end of the list
     * returned by this method.
     * @return	A new <code>DList</code> that is the concatenation of this list and
     * the list referenced by <code>otherList</code>.
     */
    public DList concat(DList otherList);
}