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/*
* MappingReferenceKeyElement.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.*;
import com.sun.jdo.api.persistence.model.ModelException;
/**
* This is an element which represents a relationship between two tables
* (primary and secondary). It should not be used for relationship fields
* (MappingRelationshipElement has its own set of pairs). It can be thought
* of as a "fake foreign key" meaning it designates the column pairs used to
* join the primary table with a secondary table. It is analagous to a
* foreign key and may in fact contain identical pairs as the foreign key,
* but this is not a requirement. The foreign key may define a different
* set of pairs or may not exist at all. Although any set of pairs is legal,
* the user should be careful to define pairs which represent a logical
* relationship between the two tables. The relationship should be set up as
* follows:
* First, set a primary table for the mapping class. Doing this sets up a
* "fake primary key" for the associated mapping table element. Next, add
* a secondary table and set up the pairs which establish the connection
* on the returned reference key object. This sets up whatever "fake primary
* key" information is necessary on the secondary table's mapping table,
* establishes the primary to secondary relationship via the reference keys,
* and puts the pair information into the "fake foreign key".
*
* @author Mark Munro
* @author Rochelle Raccah
* @version %I%
*/
public interface MappingReferenceKeyElement
extends MappingMemberElement, ReferenceKey
{
//======================= table handling ===========================
/** Returns the mapping table element for this referencing key.
* @return the meta data table for this referencing key
*/
public MappingTableElement getTable ();
/** Set the mapping table for this referencing key to the supplied table.
* @param table mapping table element to be used with this key.
* @exception ModelException if impossible
*/
public void setTable (MappingTableElement table) throws ModelException;
//======================= column handling ===========================
/** Returns the list of relative column pair names in this referencing key.
* @return the names of the column pairs in this referencing key
*/
public ArrayList getColumnPairNames ();
/** Remove a column pair from the holder. This method can be used to
* remove a pair by name when it cannot be resolved to an actual pair.
* @param pairName the relative name of the column pair to remove
* @throws ModelException if impossible
*/
public void removeColumnPair (String pairName) throws ModelException;
/** Remove some column pairs from the holder. This method can be used to
* remove pairs by name when they cannot be resolved to actual pairs.
* @param pairNames the relative names of the column pairs to remove
* @throws ModelException if impossible
*/
public void removeColumnPairs (ArrayList pairNames) throws ModelException;
//==== redefined from ReferenceKey to narrow Exception->ModelException ===
/** Add a new column pair to the holder.
* @param pair the pair to add
* @throws ModelException if impossible
*/
public void addColumnPair (ColumnPairElement pair) throws ModelException;
/** Add some new column pairs to the holder.
* @param pairs the column pairs to add
* @throws ModelException if impossible
*/
public void addColumnPairs (ColumnPairElement[] pairs)
throws ModelException;
/** Remove a column pair from the holder.
* @param pair the column pair to remove
* @throws ModelException if impossible
*/
public void removeColumnPair (ColumnPairElement pair)
throws ModelException;
/** Remove some column pairs from the holder.
* @param pairs the column pairs to remove
* @throws ModelException if impossible
*/
public void removeColumnPairs (ColumnPairElement[] pairs)
throws ModelException;
/** Set the column pairs for this holder.
* Previous column pairs are removed.
* @param pairs the new column pairs
* @throws ModelException if impossible
*/
public void setColumnPairs (ColumnPairElement[] pairs)
throws ModelException;
}
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