Examples with OrderIndexMapping org.datanucleus.store.rdbms.mapping.java.OrderIndexMapping used on opensource projects

Example 1 with OrderIndexMapping

use of org.datanucleus.store.rdbms.mapping.java.OrderIndexMapping in project datanucleus-rdbms by datanucleus.

the class ClassTable method addOrderColumn.

/**
 * Adds an ordering column to the element table (this) in FK list relationships.
 * Used to store the position of the element in the List.
 * If the <order> provides a mapped-by, this will return the existing column mapping.
 * @param mmd The MetaData of the field/property with the list for the column to map to
 * @return The Mapping for the order column
 */
private JavaTypeMapping addOrderColumn(AbstractMemberMetaData mmd, ClassLoaderResolver clr) {
    Class indexType = Integer.class;
    JavaTypeMapping orderIndexMapping = new OrderIndexMapping();
    orderIndexMapping.initialize(storeMgr, indexType.getName());
    orderIndexMapping.setMemberMetaData(mmd);
    orderIndexMapping.setTable(this);
    IdentifierFactory idFactory = storeMgr.getIdentifierFactory();
    DatastoreIdentifier indexColumnName = null;
    ColumnMetaData colmd = null;
    // Allow for any user definition in OrderMetaData
    OrderMetaData omd = mmd.getOrderMetaData();
    if (omd != null) {
        colmd = (omd.getColumnMetaData() != null && omd.getColumnMetaData().length > 0 ? omd.getColumnMetaData()[0] : null);
        if (omd.getMappedBy() != null) {
            // User has defined ordering using the column(s) of an existing field.
            // Not adding anything so just set table back to "initialised"
            state = TABLE_STATE_INITIALIZED;
            JavaTypeMapping orderMapping = getMemberMapping(omd.getMappedBy());
            if (!(orderMapping instanceof IntegerMapping) && !(orderMapping instanceof LongMapping)) {
                throw new NucleusUserException(Localiser.msg("057022", mmd.getFullFieldName(), omd.getMappedBy()));
            }
            return orderMapping;
        }
        String colName = null;
        if (omd.getColumnMetaData() != null && omd.getColumnMetaData().length > 0 && omd.getColumnMetaData()[0].getName() != null) {
            // User-defined name so create an identifier using it
            colName = omd.getColumnMetaData()[0].getName();
            indexColumnName = idFactory.newColumnIdentifier(colName);
        }
    }
    if (indexColumnName == null) {
        // No name defined so generate one
        indexColumnName = idFactory.newForeignKeyFieldIdentifier(mmd, null, null, storeMgr.getNucleusContext().getTypeManager().isDefaultEmbeddedType(indexType), FieldRole.ROLE_INDEX);
    }
    Column column = addColumn(indexType.getName(), indexColumnName, orderIndexMapping, colmd);
    if (colmd == null || (colmd.getAllowsNull() == null) || (colmd.getAllowsNull() != null && colmd.isAllowsNull())) {
        // User either wants it nullable, or havent specified anything, so make it nullable
        column.setNullable(true);
    }
    storeMgr.getMappingManager().createDatastoreMapping(orderIndexMapping, column, indexType.getName());
    return orderIndexMapping;
}