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

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

import java.util.List;
import java.util.ArrayList;

import org.netbeans.modules.dbschema.TableElement;
import org.netbeans.modules.dbschema.SchemaElement;

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

/** 
 *
 * @author raccah
 * @version %I%
 */
public interface MappingClassElement extends MappingElement
{
	/** Constant representing mapping file extension. */
	public static final String MAPPING_EXTENSION = "mapping";		// NOI18N

	/** Constant representing Consistency level.
	 * NONE_CONSISTENCY implies that no consistency semantics are enforced.
	 */
	public static final int NONE_CONSISTENCY = 0x0;

	/** Constant representing Consistency level.
	 * CHECK_MODIFIED_AT_COMMIT_CONSISTENCY implies that at commit, 
	 * consistency check is enforced for all fetched fields of modified 
	 * objects.
	 */
	public static final int CHECK_MODIFIED_AT_COMMIT_CONSISTENCY  = 0x1;

	/** Constant representing Consistency level.
	 * CHECK_ALL_AT_COMMIT_CONSISTENCY implies that at commit, consistency 
	 * check is enforced for all the fields of objects at this consistency 
	 * level.
	 * Please note that this level is not supported in the current release.
	 */
	public static final int CHECK_ALL_AT_COMMIT_CONSISTENCY  = 0x2;

	/** Constant representing Consistency level.
	 * LOCK_WHEN_MODIFIED_CONSISTENCY implies exclusive lock is obtained for 
	 * data corresponding to this object when an attempt to modify the object 
	 * is made.
	 * Please note that this level is not supported in the current release.
	 */
	public static final int LOCK_WHEN_MODIFIED_CONSISTENCY   = 0x4;

	/** Constant representing Consistency level.
	 * LOCK_WHEN_MODIFIED_CHECK_ALL_AT_COMMIT_CONSISTENCY implies exclusive 
	 * lock is obtained for data corresponding to this object when an attempt 
	 * to modify the object is made.  Also at commit, consistency check is 
	 * enforced for all the fields of objects at this consistency level.
	 * Please note that this level is not supported in the current release.
	 */
	public static final int LOCK_WHEN_MODIFIED_CHECK_ALL_AT_COMMIT_CONSISTENCY =
		CHECK_ALL_AT_COMMIT_CONSISTENCY | LOCK_WHEN_MODIFIED_CONSISTENCY;

	/** Constant representing Consistency level.
	 * LOCK_WHEN_LOADED_CONSISTENCY implies that exclusive lock is 
	 * obtained for data corresponding to this object before accessing it.
	 */
	public static final int LOCK_WHEN_LOADED_CONSISTENCY    = 0x8;

	/** Constant representing Consistency level.
	 * VERSION_CONSISTENCY implies that no lock is obtained for data 
	 * corresponding to this object until it will be updated.
	 */
	public static final int VERSION_CONSISTENCY    = 0x10;

	// TBD
// clears out fields -- equiv to new, can take it out
//	public void clear ();
//	public boolean mapFieldToTable (MappingFieldElement field, 
//		TableElement table);

	/** Returns the version number of this MappingClassElement object.
	 * Please note, the returned version number reflects the version number at 
	 * the last save, NOT the version number of the memory representation.
	 * @return version number
	 */
	public int getVersionNumber ();

	/** Returns true if the version number of this MappingClassElement object
	 * is older than the current version number of the archiving scheme.
	 * @see #getVersionNumber
	 * @return true if it is in need of updating, false otherwise
	 */
	public boolean hasOldVersionNumber ();

	/** This method is called after a MappingClassElement is unarchived 
	 * from a .mapping file.  This method provides a hook to do any checking 
	 * (version number checking) and conversion after unarchiving.
	 * @exception ModelException if impossible
	 */
	public void postUnarchive () throws ModelException;
	
	/** This method is called prior to storing a MappingClassElement in a 
	 * .mapping file.  This method provides a hook to do any conversion 
	 * before archiving.
	 * @exception ModelException if impossible
	 */
	public void preArchive () throws ModelException;

	/** Gets the modified flag for this mapping class.
	 * @return true if there have been (property) changes to this 
	 * class, false otherwise.
	 */
	public boolean isModified ();

	/** Set the modified flag for this mapping class to flag.  This is usually 
	 * set to true by property changes and false 
	 * after a save.
	 * @param flag if true, this class is marked as modified;
	 * if false, it is marked as unmodified.
	 */
	public void setModified (boolean flag);

	/** Gets the consistency level of this mapping class.
	 * @return the consistency level, one of {@link #NONE_CONSISTENCY},
	 * {@link #CHECK_MODIFIED_AT_COMMIT_CONSISTENCY}, 
	 * {@link #CHECK_ALL_AT_COMMIT_CONSISTENCY}, 
	 * {@link #LOCK_WHEN_MODIFIED_CONSISTENCY}, 
	 * {@link #LOCK_WHEN_MODIFIED_CHECK_ALL_AT_COMMIT_CONSISTENCY}, 
	 * {@link #LOCK_WHEN_LOADED_CONSISTENCY}, or 
	 * {@link #VERSION_CONSISTENCY}.
	 */
	public int getConsistencyLevel ();

	/** Set the consistency level of this mapping class.
	 * @param level an integer indicating the consistency level, one of:
	 * {@link #NONE_CONSISTENCY},{@link #CHECK_MODIFIED_AT_COMMIT_CONSISTENCY}, 
	 * {@link #CHECK_ALL_AT_COMMIT_CONSISTENCY}, 
	 * {@link #LOCK_WHEN_MODIFIED_CONSISTENCY}, 
	 * {@link #LOCK_WHEN_MODIFIED_CHECK_ALL_AT_COMMIT_CONSISTENCY}, 
	 * {@link #LOCK_WHEN_LOADED_CONSISTENCY}, or 
	 * {@link #VERSION_CONSISTENCY}.
	 * @exception ModelException if impossible.
	 */
	public void setConsistencyLevel (int level)  throws ModelException;

	//======================= schema handling ===========================

	/** Returns the name of the SchemaElement which represents the 
	 * database used by the tables mapped to this mapping class element.
	 * @return the name of the database root for this mapping class
	 */
	public String getDatabaseRoot ();

	/** Set the database root for this MappingClassElement.
	 * The root represents the database used by the tables mapped to 
	 * this mapping class.
	 * @param root the new database root
	 * @exception ModelException if impossible
	 */
	public void setDatabaseRoot (SchemaElement root) throws ModelException;

	//======================= table handling ===========================

	/** Returns the list of tables (MappingTableElements) used by this mapping 
	 * class.
	 * @return the meta data tables for this mapping class
	 */
	public ArrayList getTables ();

	/** Scans through this mapping class looking for a table whose
	 * name matches the name passed in.
	 * @param name name of the table to find.
	 * @return the meta data table whose name matches the name parameter
	 */
	public MappingTableElement getTable (String name);

	/** Convenience method which accepts a table element and attempts to add 
	 * it as either a primary or secondary table depending on the existing list
	 * of tables and the foreign keys for the table.
	 * @param table table element to be added as either a primary or secondary 
	 * table.
	 * @exception ModelException if impossible
	 */
	public void addTable (TableElement table) throws ModelException;

	/** Set the primary table for this mapping class to the supplied table.
	 * @param table table element to be used as the primary table.
	 * @exception ModelException if impossible
	 */
	public void setPrimaryTable (TableElement table) throws ModelException;

	/** Adds a reference to the supplied table as a secondary table for this
	 * mapping class.  It creates a MappingReferenceKeyElement for the supplied
	 * primary/secondary table pair.
	 * @param parentTable mapping table element which should also be the primary
	 * table.
	 * @param table table element to be used as a secondary table.
	 * @exception ModelException if impossible
	 */
	public MappingReferenceKeyElement addSecondaryTable (MappingTableElement 
		parentTable, TableElement table) throws ModelException;

	/** Removes the reference to the supplied table as a mapped table for this
	 * mapping class.  This works whether the table is the primary table or a 
	 * secondary table.
	 * @param table mapping table element to be removed from this mapping class.
	 * @exception ModelException if impossible
	 */
	public void removeTable (MappingTableElement table) throws ModelException;

	//======================= field handling ===========================

	/** Returns the list of fields (MappingFieldElements) in this mapping 
	 * class.  This list includes both local and relationship fields.
	 * @return the mapping fields in this mapping class
	 */
	public ArrayList getFields ();

	/** Scans through this mapping class looking for a field whose
	 * name matches the name passed in.
	 * @param name name of the field to find.
	 * @return the mapping field whose name matches the name parameter
	 */
	public MappingFieldElement getField (String name);

	/** Adds a field to the list of fields in this mapping class.
	 * @param field field element to be added
	 * @exception ModelException if impossible
	 */
	public void addField (MappingFieldElement field) throws ModelException;

	/** Removes a field from the list of fields in this mapping class.
	 * @param field field element to be removed
	 * @exception ModelException if impossible
	 */
	public void removeField (MappingFieldElement field) throws ModelException;

	/** Returns the list of version fields (MappingFieldElements) in this 
	 * mapping class.  This list only includes fields if the consistency 
	 * level is {@link #VERSION_CONSISTENCY}.
	 * @return the version fields in this mapping class
	 */
	public List getVersionFields ();

	/** Gets the navigable flag for this mapping class.
	 * @return true if lazy initialization will be used, 
	 * false if access to a non-fetched field will result in an
	 * exception.  The default is true.
	 */
	public boolean isNavigable ();

	/** Set the navigable flag for this mapping class to flag.
	 * @param flag if true, lazy initialization will be used;
	 * if false, access to a non-fetched field will result in an
	 * exception.
	 * @exception ModelException if impossible
	 */
	public void setNavigable (boolean flag) throws ModelException;
}