Examples of org.apache.openjpa.jdbc.meta.Discriminator

org.apache.openjpa.jdbc.meta.Discriminator
Handles determining the object class of database records. @author Abe White

            verts = getVerticalMappings(mappings[i], subclasses, exps[i],
                subclassMode);
            if (verts.length == 1 && subclasses)
                subclassBits.set(sels.size());


            Discriminator disc = mappings[i].getDiscriminator();
            if (mappings.length > 1 && disc != null && disc.getColumns().length == 0 &&
                disc.getStrategy() instanceof NoneDiscriminatorStrategy)
                ctx.tpcMeta = mappings[i];


            // create criteria select and clone for each vert mapping
            sel = ((JDBCExpressionFactory) facts[i]).getSelectConstructor().
                evaluate(ctx, null, null, exps[i], states[i]);

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            col.setIdentifier(DBIdentifier.newColumn(dcol.name(),delimit()));
        }
        if (!StringUtils.isEmpty(dcol.columnDefinition())) {
            col.setTypeIdentifier(DBIdentifier.newColumnDefinition(dcol.columnDefinition()));
        }
        Discriminator discrim = cm.getDiscriminator();
        switch (dcol.discriminatorType()) {
            case CHAR:
                col.setJavaType(JavaTypes.CHAR);
                discrim.setJavaType(JavaTypes.CHAR);
                break;
            case INTEGER:
                col.setJavaType(JavaTypes.INT);
                if (dcol.length() != 31)
                    col.setSize(dcol.length());
                discrim.setJavaType(JavaTypes.INT);
                break;
            default:
                col.setJavaType(JavaTypes.STRING);
                col.setSize(dcol.length());
                discrim.setJavaType(JavaTypes.STRING);
        }
        cm.getDiscriminator().getMappingInfo().setColumns
            (Arrays.asList(new Column[]{ col }));
    }

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            pstate.field.appendIndex(sql, sel, pstate.joins);
    }


    public void appendType(Select sel, ExpContext ctx, ExpState state, 
        SQLBuffer sql) {
        Discriminator disc = null;
        ClassMapping sup = _class;
        while (sup.getMappedPCSuperclassMapping() != null)
            sup = sup.getMappedPCSuperclassMapping();


        disc = sup.getDiscriminator();


        Column[] cols = null;
        if (disc != null)
            cols = disc.getColumns();
        else
            cols = getColumns(state);


        if (cols == null || cols.length == 0) {
            sql.append("1");

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    /**
     * Makes sure all subclasses of the given type are loaded in the JVM.
     * This is usually done automatically.
     */
    public void loadSubclasses(ClassMapping mapping) {
        Discriminator dsc = mapping.getDiscriminator();
        if (dsc.getSubclassesLoaded())
            return;


        // if the subclass list is set, no need to load subs
        if (mapping.getRepository().getPersistentTypeNames(false,
            _ctx.getClassLoader()) != null) {
            dsc.setSubclassesLoaded(true);
            return;
        }


        try {
            dsc.loadSubclasses(this);
        } catch (ClassNotFoundException cnfe) {
            throw new StoreException(cnfe);
        } catch (SQLException se) {
            throw SQLExceptions.getStore(se, _dict);
        }

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            pstate.field.appendIndex(sql, sel, pstate.joins);
    }


    public void appendType(Select sel, ExpContext ctx, ExpState state, 
        SQLBuffer sql) {
        Discriminator disc = null;
        ClassMapping sup = _class;
        while (sup.getMappedPCSuperclassMapping() != null)
            sup = sup.getMappedPCSuperclassMapping();


        disc = sup.getDiscriminator();


        Column[] cols = null;
        if (disc != null)
            cols = disc.getColumns();
        else
            cols = getColumns(state);


        if (cols == null) {
            sql.append("1");

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    /**
     * Makes sure all subclasses of the given type are loaded in the JVM.
     * This is usually done automatically.
     */
    public void loadSubclasses(ClassMapping mapping) {
        Discriminator dsc = mapping.getDiscriminator();
        if (dsc.getSubclassesLoaded())
            return;


        // if the subclass list is set, no need to load subs
        if (mapping.getRepository().getPersistentTypeNames(false,
            _ctx.getClassLoader()) != null) {
            dsc.setSubclassesLoaded(true);
            return;
        }


        try {
            dsc.loadSubclasses(this);
        } catch (ClassNotFoundException cnfe) {
            throw new StoreException(cnfe);
        } catch (SQLException se) {
            throw SQLExceptions.getStore(se, _dict);
        }

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        Column col = new Column();
        if (!StringUtils.isEmpty(dcol.name()))
            col.setName(dcol.name());
        if (!StringUtils.isEmpty(dcol.columnDefinition()))
            col.setTypeName(dcol.columnDefinition());
        Discriminator discrim = cm.getDiscriminator();
        switch (dcol.discriminatorType()) {
            case CHAR:
                col.setJavaType(JavaTypes.CHAR);
                discrim.setJavaType(JavaTypes.CHAR);
                break;
            case INTEGER:
                col.setJavaType(JavaTypes.INT);
                if (dcol.length() != 31)
                    col.setSize(dcol.length());
                discrim.setJavaType(JavaTypes.INT);
                break;
            default:
                col.setJavaType(JavaTypes.STRING);
                col.setSize(dcol.length());
                discrim.setJavaType(JavaTypes.STRING);
        }
        cm.getDiscriminator().getMappingInfo().setColumns
            (Arrays.asList(new Column[]{ col }));
    }

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        }
        if (sup == null) {
            Version vers = mapping.getVersion();
            if (!bufferCustomInsert(vers, sm, store, customs))
                vers.insert(sm, store, rowMgr);
            Discriminator dsc = mapping.getDiscriminator();
            if (!bufferCustomInsert(dsc, sm, store, customs))
                dsc.insert(sm, store, rowMgr);
        }
    }

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        ClassMapping sup = mapping.getJoinablePCSuperclassMapping();
        if (sup == null) {
            Version vers = mapping.getVersion();
            if (!bufferCustomDelete(vers, sm, store, customs))
                vers.delete(sm, store, rowMgr);
            Discriminator dsc = mapping.getDiscriminator();
            if (!bufferCustomDelete(dsc, sm, store, customs))
                dsc.delete(sm, store, rowMgr);
        }
        mapping.delete(sm, store, rowMgr);


        if (sup != null)
            delete(sm, sup, rowMgr, store, customs);

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            // if we are only updating the version column, we need to add
            // in the primary key select
            mapping.update(sm, store, rowMgr);
        } else {
            // otherwise we need to make sure we update the discriminator too
            Discriminator dsc = mapping.getDiscriminator();
            if (!bufferCustomUpdate(dsc, sm, store, customs))
                dsc.update(sm, store, rowMgr);
        }
    }

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