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.

        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() ){

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            }
        }


        // INHERITANCE
        if (xmlDescriptor.hasInheritance()) {
            InheritancePolicy inheritancePolicy = xmlDescriptor.getInheritancePolicy();
            
            if (!inheritancePolicy.hasClassExtractor()) {
                XMLField classIndicatorField = new XMLField(inheritancePolicy.getClassIndicatorFieldName());
                classIndicatorField.setNamespaceResolver(xmlDescriptor.getNamespaceResolver());
                    
                InheritanceNodeValue inheritanceNodeValue = new InheritanceNodeValue();
                inheritanceNodeValue.setInheritancePolicy(inheritancePolicy);

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        if (inheritancePolicy == null) {
            if(getDataFormat() == EISDescriptor.XML) {
                // 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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      * @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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        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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        super.initialize(session);
        XMLDescriptor xmlDescriptor = (XMLDescriptor)getDescriptor();


        // INHERITANCE
        if (xmlDescriptor.hasInheritance()) {
            InheritancePolicy inheritancePolicy = xmlDescriptor.getInheritancePolicy();
            
            if (!inheritancePolicy.hasClassExtractor()) {
                XMLField classIndicatorField = new XMLField(inheritancePolicy.getClassIndicatorFieldName());
                classIndicatorField.setNamespaceResolver(xmlDescriptor.getNamespaceResolver());
            }
        }


        if(!xmlDescriptor.isLazilyInitialized()) {

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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());
        }

View Full Code Here

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