/**
 * <copyright>
 *
 * Service Data Objects
 * Version 2.0
 * Licensed Materials - Property of BEA and IBM
 *
 * (c) Copyright BEA Systems, Inc. and International Business Machines Corp 2005.  All rights reserved.
 *
 * </copyright>
 * 
 */

package commonj.sdo;

/**
 * A sequence is a heterogeneous list of {@link Property properties} and corresponding values.
 * It represents an ordered arbitrary mixture of data values from more than one property of a {@link DataObject data object}.
 */
public interface Sequence
{
  /**
   * Returns the number of entries in the sequence.
   * @return the number of entries.
   */
  int size();

  /**
   * Returns the property for the given entry index.
   * Returns <code>null</code> for mixed text entries.
   * @param index the index of the entry.
   * @return the property or <code>null</code> for the given entry index.
   */
  Property getProperty(int index);
  
  /**
   * Returns the property value for the given entry index.
   * @param index the index of the entry.
   * @return the value for the given entry index.
   */
  Object getValue(int index);
  
  /**
   * Sets the entry at a specified index to the new value.
   * @param index the index of the entry.
   * @param value the new value for the entry.
   */
  Object setValue(int index, Object value);

  /**
   * Adds a new entry with the specified property name and value
   * to the end of the entries.
   * @param propertyName the name of the entry's property.
   * @param value the value for the entry.
   */
  boolean add(String propertyName, Object value);

  /**
   * Adds a new entry with the specified property index and value
   * to the end of the entries.
   * @param propertyIndex the index of the entry's property.
   * @param value the value for the entry.
   */
  boolean add(int propertyIndex, Object value);

  /**
   * Adds a new entry with the specified property and value
   * to the end of the entries.
   * @param property the property of the entry.
   * @param value the value for the entry.
   */
  boolean add(Property property, Object value);

  /**
   * Adds a new entry with the specified property name and value
   * at the specified entry index.
   * @param index the index at which to add the entry.
   * @param propertyName the name of the entry's property.
   * @param value the value for the entry.
   */
  void add(int index, String propertyName, Object value);

  /**
   * Adds a new entry with the specified property index and value
   * at the specified entry index.
   * @param index the index at which to add the entry.
   * @param propertyIndex the index of the entry's property.
   * @param value the value for the entry.
   */
  void add(int index, int propertyIndex, Object value);

  /**
   * Adds a new entry with the specified property and value
   * at the specified entry index.
   * @param index the index at which to add the entry.
   * @param property the property of the entry.
   * @param value the value for the entry.
   */
  void add(int index, Property property, Object value);
 
  /**
   * Removes the entry at the given entry index.
   * @param index the index of the entry.
   */
  void remove(int index);

  /**
   * Moves the entry at <code>fromIndex</code> to <code>toIndex</code>.
   * @param toIndex the index of the entry destination.
   * @param fromIndex the index of the entry to move.
   */
  void move(int toIndex, int fromIndex);
  
  /**
   * Adds a new entry with the SDO text Property
   * to the end of the Sequence.
   * Same as add(property, text) where property is the SDO text Property.
   * @param text value of the entry.
   */
  void add(String text);

  /**
   * Adds a new entry with the SDO text Property
   * at the given index.
   * Same as add(index, property, text) where property is the SDO text Property.
   * @param index the index at which to add the entry.
   * @param text value of the entry.
   */
  void add(int index, String text);
  
}