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/*
 * MappingFieldElement.java
 *
 * Created on March 3, 2000, 1:11 PM
 */

package com.sun.jdo.api.persistence.model.mapping;

import java.util.ArrayList;

import org.netbeans.modules.dbschema.DBMemberElement;

import com.sun.jdo.api.persistence.model.ModelException;

/** 
 *
 * @author raccah
 * @version %I%
 */
public interface MappingFieldElement extends MappingMemberElement
{
	/** Constant representing the jdo default fetch group. 
	 * This is what used to be mandatory for SynerJ.
	 */
	public static final int GROUP_DEFAULT = 1;

	/** Constant representing no fetch group. */
	public static final int GROUP_NONE = 0;

	/** Constant representing an independent fetch group.  All independent 
	 * fetch groups must have a value less than or equal to this constant.
	 */
	public static final int GROUP_INDEPENDENT = -1;

	// TBD:unmap all components, if remove from class remove here too
	//public void clear ();

	/** Determines whether this field element is read only or not.  
	 * @return true if the field is read only, 
	 * false otherwise
	 */
	public boolean isReadOnly ();

	/** Set whether this field element is read only or not.
	 * @param flag - if true, the field element is marked as
	 * read only; otherwise, it is not
	 * @exception ModelException if impossible
	 */
	public void setReadOnly (boolean flag) throws ModelException;

	/** Determines whether this field element is in a concurrency check or not. 
	 * @return true if the field is in a concurrency check, 
	 * false otherwise
	 */
	public boolean isInConcurrencyCheck ();

	/** Set whether this field element is in a concurrency check or not.
	 * @param flag - if true, the field element is marked as
	 * being in a concurrency check; otherwise, it is not
	 * @exception ModelException if impossible
	 */
	public void setInConcurrencyCheck (boolean flag) throws ModelException;

	/** Determines whether this field element is a version field or not.  
	 * @return true if the field is a version field, 
	 * false otherwise
	 */
	public boolean isVersion ();

	/** Set whether this field element is a version field or not.
	 * @param flag - if true, the field element is marked 
	 * as a version field; otherwise, it is not
	 * @exception ModelException if impossible
	 */
	public void setVersion (boolean flag) throws ModelException;

	//====================== fetch group handling ==========================

	/** Get the fetch group of this field element.
	 * @return the fetch group, one of {@link #GROUP_DEFAULT},  
	 * {@link #GROUP_NONE}, or anything less than or equal to 
	 * {@link #GROUP_INDEPENDENT}
	 */
	public int getFetchGroup ();

	/** Set the fetch group of this field element.
	 * @param group - an integer indicating the fetch group, one of:
	 * {@link #GROUP_DEFAULT}, {@link #GROUP_NONE}, or anything less than or
	 * equal to {@link #GROUP_INDEPENDENT}
	 * @exception ModelException if impossible
	 */
	public void setFetchGroup (int group) throws ModelException;

	//======================= column handling ===========================

	/** Returns the list of column names to which this mapping field is 
	 * mapped.
	 * @return the names of the columns mapped by this mapping field
	 */
	public ArrayList getColumns ();

	/** Adds a column to the list of columns mapped by this mapping field.
	 * @param column column element to be added to the mapping
	 * @exception ModelException if impossible
	 */
	public void addColumn (DBMemberElement column) throws ModelException;

	/** Removes a column from the list of columns mapped by this mapping field.
	 * @param columnName the relative name of the column to be removed from 
	 * the mapping
	 * @exception ModelException if impossible
	 */
	public void removeColumn (String columnName) throws ModelException;
}