Examples of org.eclipse.persistence.descriptors.InheritancePolicy

Package org.eclipse.persistence.descriptors

Examples of org.eclipse.persistence.descriptors.InheritancePolicy

org.eclipse.persistence.descriptors.InheritancePolicy

Purpose: Allows customization of an object's inheritance. The primary supported inheritance model uses a class type indicator column in the table that stores the object's class type. The class-to-type mapping is specified on this policy. The full class name can also be used for the indicator instead of the mapping.
Each subclass can either share their parents table, or in addition add their own table(s).
For legacy models a customized inheritance class-extractor can be provided. This allows Java code to be used to compute the class type to use for a row. When this customized inheritance model is used an only-instances and with-all-subclasses filter expression may be required for concrete and branch querying.

            Object value = getValue(referenceTargetClass, primaryKey);
            if(null == value) {
                DatabaseMapping mapping = (DatabaseMapping) reference.getMapping();
                ClassDescriptor targetDescriptor = mapping.getReferenceDescriptor();
                if(targetDescriptor.hasInheritance()) {
                    InheritancePolicy inheritancePolicy = targetDescriptor.getInheritancePolicy();
                    List<ClassDescriptor> childDescriptors = inheritancePolicy.getAllChildDescriptors();
                    for(ClassDescriptor childDescriptor : childDescriptors) {
                        value = getValue(childDescriptor.getJavaClass(), primaryKey);
                        if(null != value) {
                            return value;
                        }

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    protected void setInheritancePolicy(MetadataDescriptor descriptor) {
        if (m_strategy == null && ! descriptor.isInheritanceSubclass()) {
            // TODO: Log a defaulting message
        }
        
        descriptor.getClassDescriptor().setInheritancePolicy(new InheritancePolicy(descriptor.getClassDescriptor()));
    }

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        ComplexType ct = new ComplexType();
        if (!anonymous) {
            ct.setName(desc.getSchemaReference().getSchemaContextAsQName(workingSchema.getNamespaceResolver()).getLocalPart());
        }


        InheritancePolicy inheritancePolicy = desc.getInheritancePolicyOrNull();
        Extension extension = null;
        if (inheritancePolicy != null && inheritancePolicy.getParentClass() != null) {
            extension = new Extension();
            extension.setBaseType(desc.getSchemaReference().getSchemaContextAsQName(workingSchema.getNamespaceResolver()).getLocalPart());
            ComplexContent complexContent = new ComplexContent();
            complexContent.setExtension(extension);
            ct.setComplexContent(complexContent);

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        // only need to check in the root case since the nested case is handled
        // in the mapping
        if (concreteDescriptor.hasInheritance() && (parent == null)) {
            // look for an xsi:type attribute in the xml document
            InheritancePolicy inheritancePolicy = concreteDescriptor.getInheritancePolicy();
            Class classValue = inheritancePolicy.classFromRow(databaseRow, query.getSession());
            if ((classValue == null) && isXmlDescriptor()) {
                // no xsi:type attribute - look for type indicator on the
                // default root element
                QName leafElementType = ((XMLDescriptor) concreteDescriptor).getDefaultRootElementType();


                // if we have a user-set type, try to get the class from the
                // inheritance policy
                if (leafElementType != null) {
                    XPathQName xpathQName = new XPathQName(leafElementType, row.isNamespaceAware());
                    Object indicator = inheritancePolicy.getClassIndicatorMapping().get(xpathQName);
                    if (indicator != null) {
                        classValue = (Class)indicator;
                    }
                }
            }


            // if we found the class, use it - otherwise, use the descriptor
            // class, if non-abstract
            if (classValue != null) {
                concreteDescriptor = query.getSession().getDescriptor(classValue);
                if ((concreteDescriptor == null) && query.hasPartialAttributeExpressions()) {
                    concreteDescriptor = getDescriptor();
                }
                if (concreteDescriptor == null) {
                    throw QueryException.noDescriptorForClassFromInheritancePolicy(query, classValue);
                }
            } else {
                // make sure the class is non-abstract
                if (Modifier.isAbstract(concreteDescriptor.getJavaClass().getModifiers())) {
                    // throw an exception
                    throw DescriptorException.missingClassIndicatorField(databaseRow, inheritancePolicy.getDescriptor());
                }
            }
        }
        domainObject = concreteDescriptor.getObjectBuilder().buildNewInstance();
        row.setCurrentObject(domainObject);

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        if (referenceDescriptor != null && referenceDescriptor == xmlDescriptor) {
            return false;
        }
        if (xmlDescriptor.hasInheritance() && !xmlDescriptor.getInheritancePolicy().isRootParentDescriptor()) {
            InheritancePolicy inheritancePolicy = xmlDescriptor.getInheritancePolicy();
            XMLField indicatorField = (XMLField) inheritancePolicy.getClassIndicatorField();
            if (indicatorField != null && xsiTypeIndicatorField) {
                Object classIndicatorValueObject = inheritancePolicy.getClassIndicatorMapping().get(xmlDescriptor.getJavaClass());
                String classIndicatorUri = null;
                String classIndicatorLocal= null;
                String classIndicatorPrefix= null;
                if (classIndicatorValueObject instanceof QName) {
                    QName classIndicatorQName = (QName) classIndicatorValueObject;
                    classIndicatorUri = classIndicatorQName.getNamespaceURI();
                    classIndicatorLocal = classIndicatorQName.getLocalPart();
                    classIndicatorPrefix = classIndicatorQName.getPrefix();
                } else {
                    String classIndicatorValue = (String) inheritancePolicy.getClassIndicatorMapping().get(xmlDescriptor.getJavaClass());
                    int nsindex = classIndicatorValue.indexOf(XMLConstants.COLON);
                    String prefix = null;
                    if (nsindex != -1) {
                        classIndicatorLocal = classIndicatorValue.substring(nsindex + 1);
                        prefix = classIndicatorValue.substring(0, nsindex);
                    } else {
                        classIndicatorLocal = classIndicatorValue;
                    }
                    classIndicatorUri = xmlDescriptor.getNonNullNamespaceResolver().resolveNamespacePrefix(prefix);
                }
                if(leafType == null 
                        || isRootElement && record.getMarshaller().getMediaType() == MediaType.APPLICATION_JSON && !record.getMarshaller().isIncludeRoot() 
                        || !(leafType.getLocalPart().equals(classIndicatorLocal))
                        || (classIndicatorUri == null && (leafType.getNamespaceURI() != null && leafType.getNamespaceURI().length() >0))
                        || (classIndicatorUri != null && !classIndicatorUri.equals(leafType.getNamespaceURI()))
                       ){
                    if (inheritancePolicy.hasClassExtractor()) {
                        inheritancePolicy.addClassIndicatorFieldToRow(record);
                    } else {
                        writeXsiTypeAttribute(xmlDescriptor, record, classIndicatorUri, classIndicatorLocal,classIndicatorPrefix, isRootElement);
                    }
                    return true;
                }

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        // 2612538 - the default size of Map (32) is appropriate
        Map clonedExpressions = new IdentityHashMap();
        SQLSelectStatement selectStatement = buildBaseSelectStatement(false, clonedExpressions);


        ClassDescriptor descriptor = getDescriptor();
        InheritancePolicy policy = descriptor.getInheritancePolicy();
        // The onlyInstances expression is only included on leaf descriptor base select,
        // so if a root or branch (!shouldReadSubclasses means leaf), then it must be appended.
        if (policy.shouldReadSubclasses()) {
            Expression indicatorExpression = null;
            // If the descriptor is a single table branch, then select the whole branch in a single query.
            if (this.query.isReadAllQuery() && policy.hasChildren() && !policy.hasMultipleTableChild()) {
                indicatorExpression = policy.getWithAllSubclassesExpression();
            } else {
                indicatorExpression = policy.getOnlyInstancesExpression();                
            }
            if ((indicatorExpression != null) && (selectStatement.getWhereClause() != null)) {
                selectStatement.setWhereClause(selectStatement.getWhereClause().and(indicatorExpression));
            } else if (indicatorExpression != null) {
                selectStatement.setWhereClause((Expression)indicatorExpression.clone());

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        if (getQuery().isReportQuery()) {
            SQLSelectStatement statement = buildReportQuerySelectStatement(false);
            setSQLStatement(statement);
            // For bug 2718118 inheritance with cursors is supported provided there is a read all subclasses view.
        } else if (getDescriptor().hasInheritance() && getDescriptor().getInheritancePolicy().requiresMultipleTableSubclassRead() && getDescriptor().getInheritancePolicy().hasView()) {
            InheritancePolicy inheritancePolicy = getDescriptor().getInheritancePolicy();
            SQLSelectStatement statement = inheritancePolicy.buildViewSelectStatement((ObjectLevelReadQuery)getQuery());
            setSQLStatement(statement);
        } else {
            setSQLStatement(buildNormalSelectStatement());
        }

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        // Check for multiple table inheritance which may require multiple queries.
        if (!getDescriptor().hasInheritance() || !getDescriptor().getInheritancePolicy().requiresMultipleTableSubclassRead()){
            setSQLStatement(buildNormalSelectStatement());
            super.prepareSelectAllRows();
        } else {
            InheritancePolicy policy = getDescriptor().getInheritancePolicy();
            if (policy.hasView()){
                // CR#3158703 if the descriptor has a view, then it requires a single select,
                // so can be prepared.
                setSQLStatement(getDescriptor().getInheritancePolicy().buildViewSelectStatement((ObjectLevelReadQuery)getQuery()));
                super.prepareSelectAllRows();
            } else if ( ((ObjectLevelReadQuery)getQuery()).shouldOuterJoinSubclasses() ){

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        // Check for multiple table inheritance which may require multiple queries.
        if (!getDescriptor().hasInheritance() || !getDescriptor().getInheritancePolicy().requiresMultipleTableSubclassRead()){
            setSQLStatement(buildNormalSelectStatement());
            super.prepareSelectOneRow();
        } else {
            InheritancePolicy policy = getDescriptor().getInheritancePolicy();
            if (policy.hasView()){
                // CR#3158703 if the descriptor has a view, then it requires a single select,
                // so can be prepared.
                setSQLStatement(getDescriptor().getInheritancePolicy().buildViewSelectStatement((ObjectLevelReadQuery)getQuery()));
                super.prepareSelectOneRow();
            } else if ( ((ObjectLevelReadQuery)getQuery()).shouldOuterJoinSubclasses() ){

View Full Code Here

    protected void setInheritancePolicy(MetadataDescriptor descriptor) {
        if (m_strategy == null && ! descriptor.isInheritanceSubclass()) {
            // TODO: Log a defaulting message
        }
        
        descriptor.getClassDescriptor().setInheritancePolicy(new InheritancePolicy(descriptor.getClassDescriptor()));
    }

View Full Code Here

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