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.

        // 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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        int size = databaseRows.size();
        if (size > 0) {
            AbstractSession session = query.getSession();
            session.startOperationProfile(SessionProfiler.ObjectBuilding, query, SessionProfiler.ALL);
            try {
                InheritancePolicy inheritancePolicy = null;
                if (this.descriptor.hasInheritance()) {
                    inheritancePolicy = this.descriptor.getInheritancePolicy();
                }
                boolean isUnitOfWork = session.isUnitOfWork();
                boolean shouldCacheQueryResults = query.shouldCacheQueryResults();

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        AbstractSession session = query.getSession();
        session.startOperationProfile(SessionProfiler.ObjectBuilding, query, SessionProfiler.ALL);
        try {
            boolean hasNext = resultSet.next();
            if (hasNext) {
                InheritancePolicy inheritancePolicy = null;
                if (this.descriptor.hasInheritance()) {
                    inheritancePolicy = this.descriptor.getInheritancePolicy();
                }
                boolean isUnitOfWork = session.isUnitOfWork();
                boolean shouldCacheQueryResults = query.shouldCacheQueryResults();

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     */
    public Object buildObjectsFromCursorInto(ReadAllQuery query, List databaseRows, Object domainObjects) {
        AbstractSession session = query.getSession();
        session.startOperationProfile(SessionProfiler.ObjectBuilding, query, SessionProfiler.ALL);
        try {
            InheritancePolicy inheritancePolicy = null;
            if (this.descriptor.hasInheritance()) {
                inheritancePolicy = this.descriptor.getInheritancePolicy();
            }
            boolean isUnitOfWork = session.isUnitOfWork();
            boolean shouldCacheQueryResults = query.shouldCacheQueryResults();

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    /**
     * Return an instance of the receivers javaClass. Set the attributes of an instance
     * from the values stored in the database row.
     */
    public Object buildObject(ObjectBuildingQuery query, AbstractRecord databaseRow, JoinedAttributeManager joinManager) {
        InheritancePolicy inheritancePolicy = null;
        if (this.descriptor.hasInheritance()) {
            inheritancePolicy = this.descriptor.getInheritancePolicy();
        }
        AbstractSession session = query.getSession();
        session.startOperationProfile(SessionProfiler.ObjectBuilding, query, SessionProfiler.ALL);

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      * @return
      */
     protected ClassDescriptor getParentDescriptorFromInheritancePolicy(Object parentObj){
         ClassDescriptor realParentDescriptor = m_parentDescriptor;
         if (realParentDescriptor.hasInheritance()){
             InheritancePolicy inheritancePolicy = realParentDescriptor.getInheritancePolicy();
             ClassDescriptor childDescriptor = inheritancePolicy.getDescriptor(parentObj.getClass());
             if (childDescriptor != null){
                 realParentDescriptor = childDescriptor;
             }
         }
         return realParentDescriptor;

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    }


    public Expression getTypeClause() {
        if (typeExpression == null) { 
            if (getDescriptor() !=null && isDowncast()) {
                InheritancePolicy ip = this.getDescriptor().getInheritancePolicy();
                if (ip.isChildDescriptor()) {//or use the isDowncast flag.  Don't need to do anything if its not a downcast
                    //equivalent to typeExpressionBase.type().in(this.getDescriptor().getInheritancePolicy().getChildClasses())
                    typeExpression = ip.getWithAllSubclassesExpression();
                    if (typeExpression == null ) {
                        typeExpression = typeExpressionBase.type().equal(this.getDescriptor().getJavaClass());
                    } else {
                        typeExpression = this.typeExpressionBase.twist(typeExpression, typeExpressionBase);
                    }

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    private 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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        if (inheritancePolicy == null) {
            if(isXMLFormat()) {
                // Lazy initialize to conserve space in non-inherited classes.
                setInheritancePolicy(new org.eclipse.persistence.internal.oxm.QNameInheritancePolicy(this));
            } else {
                setInheritancePolicy(new InheritancePolicy(this));
            }
        }
        return inheritancePolicy;
    }

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