Examples of org.jpox.store.mapped.mapping.DiscriminatorMapping

org.jpox.store.mapped.mapping.DiscriminatorMapping
Mapping for a discriminator column in a table used in inheritance. The discriminator column is, by default, a String type, typically VARCHAR. It can however be "long" based if the user specifies INTEGER, BIGINT, or NUMERIC as the jdbc-type. In the latter case we make the necessary conversions between value types in this mapping class. This class is for internal use only. It should not be used in user mappings nor extended. @version $Revision: 1.34 $

        if (fieldType != null && !fieldType.equals(mapping.getType()))
        {
            // The field relation is to a table that allows multiple types to be stored (and has a discriminator)
            // and the type we want is not the base type, so we need to restrict the values of the discriminator.
            DiscriminatorMetaData dismd = table.getDiscriminatorMetaData();
            DiscriminatorMapping discriminatorMapping = (DiscriminatorMapping)table.getDiscriminatorMapping(false);
            if (dismd != null && dismd.getStrategy() != DiscriminatorStrategy.NONE)
            {
                // Start with the required class
                BooleanExpression discrExpr = booleanConditionForClassInDiscriminator(qs, fieldType, dismd, discriminatorMapping, te);

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            }


            // Check if the table of the field has a discriminator
            IdentifierFactory idFactory = qs.getStoreManager().getIdentifierFactory();
            DiscriminatorMetaData dismd = table.getDiscriminatorMetaData();
            DiscriminatorMapping discriminatorMapping = (DiscriminatorMapping)table.getDiscriminatorMapping(false);
            if (discriminatorMapping != null)
            {
                // Has a discriminator so do a join to the table of the field and apply a constraint on its discriminator
                LogicSetExpression fieldTblExpr = null;
                if (fieldName == null)

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            {
                // Backwards compatibility only. Creates discriminator in all subclass tables even though not needed
                // TODO Remove this in the future
                if (dismd.getStrategy() == DiscriminatorStrategy.CLASS_NAME)
                {
                    discriminatorMapping = new DiscriminatorMapping(dba, this, dba.getMapping(String.class, storeMgr));
                }
                else if (dismd.getStrategy() == DiscriminatorStrategy.VALUE_MAP)
                {
                    ColumnMetaData disColmd = dismd.getColumnMetaData();
                    if (disColmd != null && disColmd.getJdbcType() != null)
                    {
                        if (disColmd.getJdbcType().equalsIgnoreCase("INTEGER") ||
                                disColmd.getJdbcType().equalsIgnoreCase("BIGINT") ||
                                disColmd.getJdbcType().equalsIgnoreCase("NUMERIC"))
                        {
                            discriminatorMapping = new DiscriminatorMapping(dba, this, dba.getMapping(Long.class, storeMgr));
                        }
                        else
                        {
                            discriminatorMapping = new DiscriminatorMapping(dba, this, dba.getMapping(String.class, storeMgr));
                        }
                    }
                    else
                    {
                        discriminatorMapping = new DiscriminatorMapping(dba, this, dba.getMapping(String.class, storeMgr));
                    }
                }
            }
            else
            {
                // Create discriminator column only in top most table that needs it
                ClassTable tableWithDiscrim = getTableWithDiscriminator();
                if (tableWithDiscrim == this)
                {
                    // No superclass with a discriminator so add it in this table
                    if (dismd.getStrategy() == DiscriminatorStrategy.CLASS_NAME)
                    {
                        discriminatorMapping = new DiscriminatorMapping(dba, this, 
                            dba.getMapping(String.class, storeMgr));
                    }
                    else if (dismd.getStrategy() == DiscriminatorStrategy.VALUE_MAP)
                    {
                        ColumnMetaData disColmd = dismd.getColumnMetaData();
                        if (disColmd != null && disColmd.getJdbcType() != null)
                        {
                            if (disColmd.getJdbcType().equalsIgnoreCase("INTEGER") ||
                                    disColmd.getJdbcType().equalsIgnoreCase("BIGINT") ||
                                    disColmd.getJdbcType().equalsIgnoreCase("NUMERIC"))
                            {
                                discriminatorMapping = new DiscriminatorMapping(dba, this,
                                    dba.getMapping(Long.class, storeMgr));
                            }
                            else
                            {
                                discriminatorMapping = new DiscriminatorMapping(dba, this, 
                                    dba.getMapping(String.class, storeMgr));
                            }
                        }
                        else
                        {
                            discriminatorMapping = new DiscriminatorMapping(dba, this, 
                                dba.getMapping(String.class, storeMgr));
                        }
                    }
                }
            }

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Related Classes of org.jpox.store.mapped.mapping.DiscriminatorMapping

org.jpox.metadata.ColumnMetaData

org.jpox.metadata.DiscriminatorMetaData

org.jpox.store.mapped.DatastoreField

org.jpox.store.mapped.DatastoreIdentifier

org.jpox.store.mapped.expression.ObjectExpression

org.jpox.store.mapped.IdentifierFactory

org.jpox.store.rdbms.table.ClassTable

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