Package org.datanucleus.metadata

Examples of org.datanucleus.metadata.DiscriminatorMetaData


                {
                    discrimMapping.setObject(ec, ps, new int[]{param[n]}, value.getClass().getName());
                }
                else if (discrimMetaData.getStrategy() == DiscriminatorStrategy.VALUE_MAP)
                {
                    DiscriminatorMetaData valueDismd = embCmd.getInheritanceMetaData().getDiscriminatorMetaData();
                    discrimMapping.setObject(ec, ps, new int[]{param[n]}, valueDismd.getValue());
                }
                n++;
            }

            for (int i=0; i<javaTypeMappings.size(); i++)
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                refString = value.getClass().getName() + ":" + sm.getInternalObjectId();
            }
            else if (mappingStrategy == XCALIA_MAPPING)
            {
                AbstractClassMetaData cmd = sm.getClassMetaData();
                DiscriminatorMetaData dismd = cmd.getDiscriminatorMetaData();
                String definer = null;
                if (dismd != null && dismd.getValue() != null)
                {
                    definer = dismd.getValue();
                }
                else
                {
                    definer = cmd.getFullClassName();
                }
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        String collDiscName = null;
        if (elemCmd.hasDiscriminatorStrategy()) {
          collDiscName = elemCmd.getDiscriminatorColumnName();
          if (embmd != null && embmd.getDiscriminatorMetaData() != null) {
            // Override if specified under <embedded>
            DiscriminatorMetaData dismd = embmd.getDiscriminatorMetaData();
            ColumnMetaData discolmd = dismd.getColumnMetaData();
            if (discolmd != null && discolmd.getName() != null) {
              collDiscName = discolmd.getName();
            }
          }
          if (collDiscName == null) {
            collDiscName = getPropertyNameForMember(mmd) + ".discrim";
          }
        }

        for (int i=0;i<collSize;i++) {
          Class elementCls = elementType;
          if (collDiscName != null) {
            Object discVal = datastoreEntity.getProperty(collDiscName + "." + i);
            String className =
              org.datanucleus.metadata.MetaDataUtils.getClassNameFromDiscriminatorValue((String)discVal,
                  elemCmd.getDiscriminatorMetaDataRoot(), ec);
            elementCls = clr.classForName(className);
          }

          ObjectProvider embeddedOP = getEmbeddedObjectProvider(elementCls, fieldNumber, null);
          fieldManagerStateStack.addFirst(new FieldManagerState(embeddedOP, embmd, i));
          try {
            embeddedOP.replaceFields(embeddedOP.getClassMetaData().getAllMemberPositions(), this);
          } finally {
            fieldManagerStateStack.removeFirst();
          }
          coll.add(embeddedOP.getObject());
        }
        return getObjectProvider().wrapSCOField(fieldNumber, coll, false, false, true);
      } else if (mmd.hasArray()) {
        // Embedded arrays
        String arrPropName = getPropertyNameForMember(mmd) + ".size";
        Long arrSize = (Long)datastoreEntity.getProperty(arrPropName);
        if (arrSize == null || arrSize == -1) {
          // Size of array not stored or stored as -1, so null on persist
          return null;
        }

        Class elementType = clr.classForName(mmd.getArray().getElementType());
        AbstractClassMetaData elemCmd = mmd.getArray().getElementClassMetaData(clr, ec.getMetaDataManager());
        EmbeddedMetaData embmd =
          mmd.getElementMetaData() != null ? mmd.getElementMetaData().getEmbeddedMetaData() : null;
        Object value = Array.newInstance(elementType, arrSize.intValue());

        // Use discriminator for elements if available
        String arrDiscName = null;
        if (elemCmd.hasDiscriminatorStrategy()) {
          arrDiscName = elemCmd.getDiscriminatorColumnName();
          if (embmd != null && embmd.getDiscriminatorMetaData() != null) {
            // Override if specified under <embedded>
            DiscriminatorMetaData dismd = embmd.getDiscriminatorMetaData();
            ColumnMetaData discolmd = dismd.getColumnMetaData();
            if (discolmd != null && discolmd.getName() != null) {
              arrDiscName = discolmd.getName();
            }
          }
          if (arrDiscName == null) {
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        String collDiscName = null;
        if (elemCmd.hasDiscriminatorStrategy()) {
          collDiscName = elemCmd.getDiscriminatorColumnName();
          if (embmd != null && embmd.getDiscriminatorMetaData() != null) {
            // Override if specified under <embedded>
            DiscriminatorMetaData dismd = embmd.getDiscriminatorMetaData();
            ColumnMetaData discolmd = dismd.getColumnMetaData();
            if (discolmd != null && discolmd.getName() != null) {
              collDiscName = discolmd.getName();
            }
          }
          if (collDiscName == null) {
            collDiscName = getPropertyNameForMember(mmd) + ".discrim";
          }
        }

        if (valueColl != null) {
          Iterator collIter = valueColl.iterator();
          int index = 0;
          while (collIter.hasNext()) {
            Object element = collIter.next();

            ObjectProvider embeddedOP = getEmbeddedObjectProvider(elementType, fieldNumber, element);
            fieldManagerStateStack.addFirst(new FieldManagerState(embeddedOP, embmd, index));
            embeddedOP.provideFields(embeddedOP.getClassMetaData().getAllMemberPositions(), this);

            // Add discriminator for elements if defined
            if (collDiscName != null) {
              EntityUtils.setEntityProperty(datastoreEntity, elemCmd.getDiscriminatorMetaDataRoot(),
                  collDiscName + "." + index, embeddedOP.getClassMetaData().getDiscriminatorValue());
            }

            fieldManagerStateStack.removeFirst();
            index++;
          }
        }
        return;
      } else if (mmd.hasArray()) {
        // Embedded arrays
        // This is stored flat with all property names for the element class gaining a suffix ".{index}"
        // so we have properties like "NAME.0", "PRICE.0", "NAME.1", "PRICE.1" etc.
        Class elementType = clr.classForName(mmd.getArray().getElementType());
        AbstractClassMetaData elemCmd = mmd.getArray().getElementClassMetaData(clr, ec.getMetaDataManager());
        EmbeddedMetaData embmd =
          mmd.getElementMetaData() != null ? mmd.getElementMetaData().getEmbeddedMetaData() : null;

        // Add property for size of array
        String arrBaseName = getPropertyNameForMember(mmd);
        EntityUtils.setEntityProperty(datastoreEntity, mmd, arrBaseName + ".size",
            (value != null ? Array.getLength(value) : -1));

        // Add discriminator for elements if defined
        String arrDiscName = null;
        if (elemCmd.hasDiscriminatorStrategy()) {
          arrDiscName = elemCmd.getDiscriminatorColumnName();
          if (embmd != null && embmd.getDiscriminatorMetaData() != null) {
            // Override if specified under <embedded>
            DiscriminatorMetaData dismd = embmd.getDiscriminatorMetaData();
            ColumnMetaData discolmd = dismd.getColumnMetaData();
            if (discolmd != null && discolmd.getName() != null) {
              arrDiscName = discolmd.getName();
            }
          }
          if (arrDiscName == null) {
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        }

        if (cmd.hasDiscriminatorStrategy())
        {
            // Add discriminator field
            DiscriminatorMetaData discmd = cmd.getDiscriminatorMetaData();
            String fieldName = MongoDBUtils.getFieldName(discmd);
            Object discVal = null;
            if (cmd.getDiscriminatorStrategy() == DiscriminatorStrategy.CLASS_NAME)
            {
                discVal = cmd.getFullClassName();
            }
            else
            {
                discVal = discmd.getValue();
            }
            dbObject.put(fieldName, discVal);
        }

        if (cmd.hasVersionStrategy())
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                pushStack(inhmd);
            }
            else if (localName.equals("discriminator"))
            {
                InheritanceMetaData inhmd = (InheritanceMetaData)getStack();
                DiscriminatorMetaData dismd = inhmd.newDiscriminatorMetadata();
                dismd.setColumnName(getAttr(attrs,"column"));
                dismd.setValue(getAttr(attrs,"value"));
                dismd.setStrategy(getAttr(attrs,"strategy"));
                dismd.setIndexed(getAttr(attrs,"indexed"));
                pushStack(dismd);
            }
            else if (localName.equals("query"))
            {
                MetaData emd = getStack();
                if (emd instanceof ClassMetaData)
                {
                    ClassMetaData cmd = (ClassMetaData)emd;
                    QueryMetaData qmd = new QueryMetaData(getAttr(attrs, "name"));
                    qmd.setScope(cmd.getFullClassName());
                    qmd.setLanguage(getAttr(attrs, "language"));
                    qmd.setUnmodifiable(getAttr(attrs, "unmodifiable"));
                    qmd.setResultClass(getAttr(attrs, "result-class"));
                    qmd.setUnique(getAttr(attrs, "unique"));
                    qmd.setFetchPlanName(getAttr(attrs, "fetch-plan"));
                    cmd.addQuery(qmd);
                    pushStack(qmd);
                }
                else if (emd instanceof InterfaceMetaData)
                {
                    InterfaceMetaData imd = (InterfaceMetaData)emd;
                    QueryMetaData qmd = new QueryMetaData(getAttr(attrs, "name"));
                    qmd.setScope(imd.getFullClassName());
                    qmd.setLanguage(getAttr(attrs, "language"));
                    qmd.setUnmodifiable(getAttr(attrs, "unmodifiable"));
                    qmd.setResultClass(getAttr(attrs, "result-class"));
                    qmd.setUnique(getAttr(attrs, "unique"));
                    qmd.setFetchPlanName(getAttr(attrs, "fetch-plan"));
                    imd.addQuery(qmd);
                    pushStack(qmd);
                }
                else if (emd instanceof FileMetaData)
                {
                    FileMetaData filemd = (FileMetaData)emd;
                    QueryMetaData qmd = filemd.newQueryMetadata(getAttr(attrs, "name"));
                    qmd.setLanguage(getAttr(attrs, "language"));
                    qmd.setUnmodifiable(getAttr(attrs, "unmodifiable"));
                    qmd.setResultClass(getAttr(attrs, "result-class"));
                    qmd.setUnique(getAttr(attrs, "unique"));
                    qmd.setFetchPlanName(getAttr(attrs, "fetch-plan"));
                    pushStack(qmd);
                }
            }
            else if (localName.equals("sequence"))
            {
                PackageMetaData pmd = (PackageMetaData)getStack();
                SequenceMetaData seqmd =
                    pmd.newSequenceMetadata(getAttr(attrs,"name"), getAttr(attrs,"strategy"));
                seqmd.setFactoryClass(getAttr(attrs,"factory-class"));
                seqmd.setDatastoreSequence(getAttr(attrs,"datastore-sequence"));
                pushStack(seqmd);
            }
            else if (localName.equals("field"))
            {
                MetaData md = getStack();
                FieldMetaData fmd = newFieldObject(md,attrs);
                if (md instanceof ClassMetaData)
                {
                    ClassMetaData cmd = (ClassMetaData)md;
                    cmd.addMember(fmd);
                }
                else if (md instanceof FetchGroupMetaData)
                {
                    FetchGroupMetaData fgmd = (FetchGroupMetaData)md;
                    fgmd.addMember(fmd);
                }
                else if (md instanceof EmbeddedMetaData)
                {
                    EmbeddedMetaData emd = (EmbeddedMetaData)md;
                    emd.addMember(fmd);
                }
                else if (md instanceof ForeignKeyMetaData)
                {
                    ForeignKeyMetaData fkmd = (ForeignKeyMetaData)md;
                    fkmd.addMember(fmd);
                }
                else if (md instanceof IndexMetaData)
                {
                    IndexMetaData imd = (IndexMetaData)md;
                    imd.addMember(fmd);
                }
                else if (md instanceof UniqueMetaData)
                {
                    UniqueMetaData umd = (UniqueMetaData)md;
                    umd.addMember(fmd);
                }
                pushStack(fmd);
            }
            else if (localName.equals("join"))
            {
                MetaData parent = getStack();
                String tableName = getAttr(attrs, "table");
                String columnName = getAttr(attrs, "column");
                String outer = getAttr(attrs, "outer");
                IndexedValue indexed = IndexedValue.getIndexedValue(getAttr(attrs, "indexed"));
                String unique = getAttr(attrs, "unique");
                String deleteAction = getAttr(attrs, "delete-action");

                JoinMetaData joinmd = null;
                if (parent instanceof AbstractMemberMetaData)
                {
                    AbstractMemberMetaData fmd = (AbstractMemberMetaData)parent;
                    joinmd = fmd.newJoinMetadata();
                }
                else if (parent instanceof AbstractClassMetaData)
                {
                    AbstractClassMetaData cmd = (AbstractClassMetaData)parent;
                    joinmd = new JoinMetaData();
                    cmd.addJoin(joinmd);
                }
                else if (parent instanceof InheritanceMetaData)
                {
                    InheritanceMetaData inhmd = (InheritanceMetaData)parent;
                    joinmd = inhmd.newJoinMetadata();
                }
                joinmd.setTable(tableName);
                joinmd.setColumnName(columnName);
                joinmd.setOuter(outer);
                joinmd.setIndexed(indexed);
                joinmd.setUnique(unique);
                joinmd.setDeleteAction(deleteAction);
                pushStack(joinmd);
            }
            else if (localName.equals("map"))
            {
                AbstractMemberMetaData fmd = (AbstractMemberMetaData)getStack();
                MapMetaData mapmd = fmd.newMapMetaData();
                mapmd.setKeyType(getAttr(attrs,"key-type"));
                mapmd.setEmbeddedKey(getAttr(attrs,"embedded-key"));
                mapmd.setSerializedKey(getAttr(attrs,"serialized-key"));
                mapmd.setDependentKey(getAttr(attrs,"dependent-key"));
                mapmd.setValueType(getAttr(attrs,"value-type"));
                mapmd.setEmbeddedValue(getAttr(attrs,"embedded-value"));
                mapmd.setSerializedValue(getAttr(attrs,"serialized-value"));
                mapmd.setDependentValue(getAttr(attrs,"dependent-value"));
                pushStack(mapmd);
            }
            else if (localName.equals("array"))
            {
                AbstractMemberMetaData fmd = (AbstractMemberMetaData)getStack();
                ArrayMetaData arrmd = fmd.newArrayMetaData();
                arrmd.setElementType(getAttr(attrs, "element-type"));
                arrmd.setEmbeddedElement(getAttr(attrs, "embedded-element"));
                arrmd.setSerializedElement(getAttr(attrs, "serialized-element"));
                arrmd.setDependentElement(getAttr(attrs, "dependent-element"));
                pushStack(arrmd);
            }
            else if (localName.equals("collection"))
            {
                AbstractMemberMetaData fmd = (AbstractMemberMetaData)getStack();
                CollectionMetaData collmd = fmd.newCollectionMetaData();
                collmd.setElementType(getAttr(attrs,"element-type"));
                collmd.setEmbeddedElement(getAttr(attrs,"embedded-element"));
                collmd.setSerializedElement(getAttr(attrs,"serialized-element"));
                collmd.setDependentElement(getAttr(attrs,"dependent-element"));
                pushStack(collmd);
            }
            else if (localName.equals("column"))
            {
                MetaData md = getStack();
                ColumnMetaData colmd = new ColumnMetaData();
                colmd.setName(getAttr(attrs,"name"));
                colmd.setTarget(getAttr(attrs,"target"));
                colmd.setTargetMember(getAttr(attrs,"target-field"));
                colmd.setJdbcType(getAttr(attrs,"jdbc-type"));
                colmd.setSqlType(getAttr(attrs,"sql-type"));
                colmd.setLength(getAttr(attrs,"length"));
                colmd.setScale(getAttr(attrs,"scale"));
                colmd.setAllowsNull(getAttr(attrs,"allows-null"));
                colmd.setDefaultValue(getAttr(attrs,"default-value"));
                colmd.setInsertValue(getAttr(attrs,"insert-value"));
                if (md instanceof AbstractMemberMetaData)
                {
                    AbstractMemberMetaData fmd = (AbstractMemberMetaData)md;
                    fmd.addColumn(colmd);
                }
                else if (md instanceof AbstractElementMetaData)
                {
                    AbstractElementMetaData elemd = (AbstractElementMetaData)md;
                    elemd.addColumn(colmd);
                }
                else if (md instanceof JoinMetaData)
                {
                    JoinMetaData jnmd = (JoinMetaData)md;
                    jnmd.addColumn(colmd);
                }
                else if (md instanceof IdentityMetaData)
                {
                    IdentityMetaData idmd = (IdentityMetaData)md;
                    idmd.addColumn(colmd);
                }
                else if (md instanceof ForeignKeyMetaData)
                {
                    ForeignKeyMetaData fkmd = (ForeignKeyMetaData)md;
                    fkmd.addColumn(colmd);
                }
                else if (md instanceof IndexMetaData)
                {
                    IndexMetaData idxmd = (IndexMetaData)md;
                    idxmd.addColumn(colmd);
                }
                else if (md instanceof UniqueMetaData)
                {
                    UniqueMetaData unimd = (UniqueMetaData)md;
                    unimd.addColumn(colmd);
                }
                else if (md instanceof OrderMetaData)
                {
                    OrderMetaData ormd = (OrderMetaData)md;
                    ormd.addColumn(colmd);
                }
                else if (md instanceof DiscriminatorMetaData)
                {
                    DiscriminatorMetaData dismd = (DiscriminatorMetaData)md;
                    dismd.setColumnMetaData(colmd);
                }
                else if (md instanceof VersionMetaData)
                {
                    VersionMetaData vermd = (VersionMetaData)md;
                    vermd.addColumn(colmd);
                }
                else if (md instanceof AbstractClassMetaData)
                {
                    AbstractClassMetaData cmd = (AbstractClassMetaData)md;
                    cmd.addUnmappedColumn(colmd);
                }
                else if (md instanceof PrimaryKeyMetaData)
                {
                    PrimaryKeyMetaData pkmd = (PrimaryKeyMetaData)md;
                    pkmd.addColumn(colmd);
                }
                pushStack(colmd);
            }
            else if (localName.equals("element"))
            {
                AbstractMemberMetaData fmd = (AbstractMemberMetaData)getStack();
                ElementMetaData elemmd = new ElementMetaData();
                elemmd.setColumnName(getAttr(attrs, "column"));
                elemmd.setDeleteAction(getAttr(attrs, "delete-action"));
                elemmd.setUpdateAction(getAttr(attrs, "update-action"));
                elemmd.setIndexed(IndexedValue.getIndexedValue(getAttr(attrs, "indexed")));
                elemmd.setUnique(getAttr(attrs, "unique"));
                elemmd.setMappedBy(getAttr(attrs, "mapped-by"));
                fmd.setElementMetaData(elemmd);
                pushStack(elemmd);
            }
            else if (localName.equals("key"))
            {
                AbstractMemberMetaData fmd = (AbstractMemberMetaData)getStack();
                KeyMetaData keymd = new KeyMetaData();
                keymd.setColumnName(getAttr(attrs, "column"));
                keymd.setDeleteAction(getAttr(attrs, "delete-action"));
                keymd.setUpdateAction(getAttr(attrs, "update-action"));
                keymd.setIndexed(IndexedValue.getIndexedValue(getAttr(attrs, "indexed")));
                keymd.setUnique(getAttr(attrs, "unique"));
                keymd.setMappedBy(getAttr(attrs, "mapped-by"));
                fmd.setKeyMetaData(keymd);
                pushStack(keymd);
            }
            // New value
            else if (localName.equals("value"))
            {
                AbstractMemberMetaData fmd = (AbstractMemberMetaData)getStack();
                ValueMetaData valuemd = new ValueMetaData();
                valuemd.setColumnName(getAttr(attrs, "column"));
                valuemd.setDeleteAction(getAttr(attrs, "delete-action"));
                valuemd.setUpdateAction(getAttr(attrs, "update-action"));
                valuemd.setIndexed(IndexedValue.getIndexedValue(getAttr(attrs, "indexed")));
                valuemd.setUnique(getAttr(attrs, "unique"));
                valuemd.setMappedBy(getAttr(attrs, "mapped-by"));
                fmd.setValueMetaData(valuemd);
                pushStack(valuemd);
            }
            // New fetch-group
            else if (localName.equals("fetch-group"))
            {
                MetaData md = getStack();
                FetchGroupMetaData fgmd = new FetchGroupMetaData(getAttr(attrs,"name"));
                fgmd.setPostLoad(getAttr(attrs,"post-load"));
                if (md instanceof FetchGroupMetaData)
                {
                    FetchGroupMetaData fgmdParent = (FetchGroupMetaData)md;
                    fgmdParent.addFetchGroup(fgmd);
                }
                else if (md instanceof AbstractClassMetaData)
                {
                    AbstractClassMetaData cmd = (AbstractClassMetaData)md;
                    cmd.addFetchGroup(fgmd);
                }
                else if (md instanceof FetchPlanMetaData)
                {
                    FetchPlanMetaData fpmd = (FetchPlanMetaData)md;
                    fpmd.addFetchGroup(fgmd);
                }
                pushStack(fgmd);
            }
            else if (localName.equals("extension"))
            {
                MetaData md = getStack();
                md.addExtension(getAttr(attrs,"vendor-name"), getAttr(attrs,"key"), getAttr(attrs,"value"));
            }
            else if (localName.equals("version"))
            {
                AbstractClassMetaData cmd = (AbstractClassMetaData)getStack();
                VersionMetaData vermd = cmd.newVersionMetadata();
                vermd.setStrategy(getAttr(attrs,"strategy")).setColumnName(getAttr(attrs,"column"));
                vermd.setIndexed(IndexedValue.getIndexedValue(getAttr(attrs,"indexed")));
                pushStack(vermd);
            }
            else if (localName.equals("index"))
            {
                MetaData md = getStack();
                IndexMetaData idxmd = new IndexMetaData();
                idxmd.setName(getAttr(attrs,"name"));
                idxmd.setTable(getAttr(attrs,"table"));
                idxmd.setUnique(getAttr(attrs,"unique"));
                if (md instanceof AbstractClassMetaData)
                {
                    AbstractClassMetaData cmd = (AbstractClassMetaData)md;
                    cmd.addIndex(idxmd);
                }
                else if (md instanceof AbstractMemberMetaData)
                {
                    AbstractMemberMetaData fmd = (AbstractMemberMetaData)md;
                    fmd.setIndexMetaData(idxmd);
                }
                else if (md instanceof JoinMetaData)
                {
                    JoinMetaData jmd = (JoinMetaData)md;
                    jmd.setIndexMetaData(idxmd);
                }
                else if (md instanceof AbstractElementMetaData)
                {
                    AbstractElementMetaData elmd = (AbstractElementMetaData)md;
                    elmd.setIndexMetaData(idxmd);
                }
                else if (md instanceof OrderMetaData)
                {
                    OrderMetaData omd = (OrderMetaData)md;
                    omd.setIndexMetaData(idxmd);
                }
                else if (md instanceof VersionMetaData)
                {
                    VersionMetaData vermd = (VersionMetaData)md;
                    vermd.setIndexMetaData(idxmd);
                }
                else if (md instanceof DiscriminatorMetaData)
                {
                    DiscriminatorMetaData dismd = (DiscriminatorMetaData)md;
                    dismd.setIndexMetaData(idxmd);
                }
                pushStack(idxmd);
            }
            else if (localName.equals("unique"))
            {
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                        classMetaDataByEntityName.put(cmd.getEntityName(), cmd);
                    }
                    if (cmd.getInheritanceMetaData() != null)
                    {
                        // Register the metadata under the discriminator name
                        DiscriminatorMetaData dismd = cmd.getInheritanceMetaData().getDiscriminatorMetaData();
                        if (dismd != null)
                        {
                            if (dismd.getStrategy() == DiscriminatorStrategy.CLASS_NAME)
                            {
                                classMetaDataByDiscriminatorName.put(cmd.getFullClassName(), cmd);
                            }
                            else if (dismd.getStrategy() == DiscriminatorStrategy.VALUE_MAP)
                            {
                                classMetaDataByDiscriminatorName.put(dismd.getValue(), cmd);
                            }
                        }
                    }
                }
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     * @return The Query Statement for iterating through objects with a discriminator column
     */
    public QueryExpression getQueryStatement(DatastoreIdentifier candidateAlias)
    {
        QueryExpression stmt = null;
        DiscriminatorMetaData dismd = candidateTable.getDiscriminatorMetaData();
        JavaTypeMapping discriminatorMapping = candidateTable.getDiscriminatorMapping(true);
        if (discriminatorMapping != null)
        {
            // Use discriminator metadata from the place where the discriminator mapping is defined
            dismd = discriminatorMapping.getDatastoreContainer().getDiscriminatorMetaData();
        }
        boolean hasDiscriminator = (discriminatorMapping != null && dismd.getStrategy() != DiscriminatorStrategy.NONE);

        LogicSetExpression discrimTableExpr = null;
        if (selectTable != null)
        {
            // Select the required "selectTable"
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        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);

                // Add "or" condition for any of its possible subclasses (if any)
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                return new BooleanLiteral(qs, mapping, true).eq(new BooleanLiteral(qs, mapping, true));
            }

            // 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;
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Related Classes of org.datanucleus.metadata.DiscriminatorMetaData

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