Package org.eclipse.persistence.internal.expressions

Examples of org.eclipse.persistence.internal.expressions.ObjectExpression

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     */
    public ObjectLevelReadQuery getNestedJoinedMappingQuery(Expression expression) {
        // the first element of the list is the passed expression,
        // next one is its base, ...
        // the last one's base is ExpressionBuilder.
        ObjectExpression currentExpression = (ObjectExpression)expression;
        ArrayList<Expression> expressionBaseList = new ArrayList();
        do {
            //skip aggregates since they do not have nested query objects added to JoinedMappingQueries, instead
            //reference mappings on aggregates are added to the parent's joinAttributeManager
            if (!currentExpression.getMapping().isAggregateObjectMapping()){
                expressionBaseList.add(currentExpression);
            }
            currentExpression = (ObjectExpression)currentExpression.getBaseExpression();
        } while(!currentExpression.isExpressionBuilder());
       
        // the last expression in the list is not nested - its mapping should have corresponding nestedQuery.
        DatabaseMapping currentMapping = ((QueryKeyExpression)expressionBaseList.get(expressionBaseList.size() - 1)).getMapping();
        ObjectLevelReadQuery nestedQuery = getJoinedMappingQueries_().get(currentMapping);
       
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        if ((objectExpression.getMapping() == null) || (!objectExpression.getMapping().isJoiningSupported())) {
            throw QueryException.mappingForExpressionDoesNotSupportJoining(objectExpression);
        }

        // Search if any of the expression traverse a 1-m.
        ObjectExpression baseExpression = objectExpression;
        while (!baseExpression.isExpressionBuilder()) {
            //pulled from prepareJoinExpressions
            baseExpression.setShouldUseOuterJoinForMultitableInheritance(true);
           
            if (((QueryKeyExpression)baseExpression).shouldQueryToManyRelationship()) {
                setIsToManyJoinQuery(true);
            }
            if (baseExpression.shouldUseOuterJoin()) {
                setIsOuterJoinedAttributeQuery(true);
            }
            baseExpression = (ObjectExpression)baseExpression.getBaseExpression();
        }
       
        return objectExpression;
    }
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        for (Iterator e = joinedExpressions.iterator(); e.hasNext();) {
            Expression expression = (Expression)e.next();

            // Expression has not yet been validated.
            if (expression.isObjectExpression()) {
                ObjectExpression joinedAttribute = (ObjectExpression)expression;

                // Expression may not have been initialized.
                joinedAttribute.getBuilder().setSession(session.getRootSession(null));
                if (joinedAttribute.getBuilder().getQueryClass() == null){
                    joinedAttribute.getBuilder().setQueryClass(descriptor.getJavaClass());
                }
               
                ClassDescriptor nestedDescriptor = joinedAttribute.getDescriptor();

                // expression may not be valid, no descriptor, validation occurs later.
                if (nestedDescriptor == null) {
                    return lockingClause;
                }
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     * This method is used when computing the nested queries for joined mappings.
     * It recurses computing the nested mapping queries and their join indexes.
     */
    protected void computeNestedQueriesForJoinedExpressions(List joinedExpressions, AbstractSession session, ObjectLevelReadQuery readQuery) {
        for (int index = 0; index < joinedExpressions.size(); index++) {
            ObjectExpression objectExpression = (ObjectExpression)joinedExpressions.get(index);

            // Expression may not have been initialized.
            objectExpression.getBuilder().setSession(session.getRootSession(null));
            if (objectExpression.getBuilder().getQueryClass() == null){
                objectExpression.getBuilder().setQueryClass(descriptor.getJavaClass());
            }
           
            // PERF: Cache join attribute names.
            ObjectExpression baseExpression = objectExpression;
            while (!baseExpression.getBaseExpression().isExpressionBuilder()) {
                baseExpression = (ObjectExpression)baseExpression.getBaseExpression();
            }
            this.addJoinedAttribute(baseExpression.getName());
           
            // Ignore nested
            if ((objectExpression.getBaseExpression() == objectExpression.getBuilder()) && objectExpression.getMapping().isForeignReferenceMapping()) {
                ForeignReferenceMapping mapping = (ForeignReferenceMapping)objectExpression.getMapping();

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     * It iterates through a list of join expressions and adds an index that represents where the
     * fields represented by that expression will appear in the row returned by a read query.
     */
    protected int computeIndexesForJoinedExpressions(List joinedExpressions, int currentIndex, AbstractSession session) {
        for (int index = 0; index < joinedExpressions.size(); index++) {
            ObjectExpression objectExpression = (ObjectExpression)joinedExpressions.get(index);
            DatabaseMapping mapping = objectExpression.getMapping();
            // Ignore nested
            if ((objectExpression.getBaseExpression() == objectExpression.getBuilder()) && (mapping != null) && mapping.isForeignReferenceMapping()) {
                getJoinedMappingIndexes_().put(mapping, new Integer(currentIndex));
            }
            ClassDescriptor descriptor = mapping.getReferenceDescriptor();
            int numberOfFields = 0;
            if (descriptor == null) {
                // Direct-collection mappings do not have descriptor.
                if (mapping.isDirectCollectionMapping()) {
                    numberOfFields = 1;
                } else if (mapping.isDirectMapMapping()) {
                    numberOfFields = 2;
                }
            } else if (objectExpression.isQueryKeyExpression() && objectExpression.isUsingOuterJoinForMultitableInheritance()) {
                numberOfFields = descriptor.getAllFields().size();
            } else {
                numberOfFields = descriptor.getFields().size();
            }
            currentIndex = currentIndex + numberOfFields;
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        if ((objectExpression.getMapping() == null) || (!objectExpression.getMapping().isJoiningSupported())) {
            throw QueryException.mappingForExpressionDoesNotSupportJoining(objectExpression);
        }

        // Search if any of the expression traverse a 1-m.
        ObjectExpression baseExpression = objectExpression;
        while (!baseExpression.isExpressionBuilder()) {
            if (((QueryKeyExpression)baseExpression).shouldQueryToManyRelationship()) {
                setIsToManyJoinQuery(true);
            }
            if (baseExpression.shouldUseOuterJoin()) {
                setIsOuterJoinedAttributeQuery(true);
            }
            baseExpression = (ObjectExpression)baseExpression.getBaseExpression();
        }
    }
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        for (Iterator e = joinedExpressions.iterator(); e.hasNext();) {
            Expression expression = (Expression)e.next();

            // Expression has not yet been validated.
            if (expression.isObjectExpression()) {
                ObjectExpression joinedAttribute = (ObjectExpression)expression;

                // Expression may not have been initialized.
                joinedAttribute.getBuilder().setSession(session.getRootSession(null));
                if (joinedAttribute.getBuilder().getQueryClass() == null){
                    joinedAttribute.getBuilder().setQueryClass(descriptor.getJavaClass());
                }
               
                ClassDescriptor nestedDescriptor = joinedAttribute.getDescriptor();

                // expression may not be valid, no descriptor, validation occurs later.
                if (nestedDescriptor == null) {
                    return lockingClause;
                }
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     * It recurses computing the nested mapping queries.
     */
    protected void computeNestedQueriesForBatchReadExpressions(List<Expression> batchReadExpressions) {
        int size = batchReadExpressions.size();
        for (int index = 0; index < size; index++) {
            ObjectExpression objectExpression = (ObjectExpression)batchReadExpressions.get(index);

            // Expression may not have been initialized.
            ExpressionBuilder builder = objectExpression.getBuilder();
            builder.setSession(getSession().getRootSession(null));
            builder.setQueryClass(getReferenceClass());           
           
            // PERF: Cache join attribute names.
            ObjectExpression baseExpression = objectExpression;
            while (!baseExpression.getBaseExpression().isExpressionBuilder()) {
                baseExpression = (ObjectExpression)baseExpression.getBaseExpression();
            }
            this.batchFetchPolicy.getAttributes().add(baseExpression.getName());
           
            // Ignore nested
            if (objectExpression.getBaseExpression().isExpressionBuilder()) {
                DatabaseMapping mapping = objectExpression.getMapping();
                if ((mapping != null) && mapping.isForeignReferenceMapping()) {
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     * It recurses computing the nested mapping queries.
     */
    protected void computeNestedQueriesForBatchReadExpressions(List<Expression> batchReadExpressions) {
        int size = batchReadExpressions.size();
        for (int index = 0; index < size; index++) {
            ObjectExpression objectExpression = (ObjectExpression)batchReadExpressions.get(index);

            // Expression may not have been initialized.
            ExpressionBuilder builder = objectExpression.getBuilder();
            builder.setSession(getSession().getRootSession(null));
            builder.setQueryClass(getReferenceClass());           
           
            // PERF: Cache join attribute names.
            ObjectExpression baseExpression = objectExpression;
            while (!baseExpression.getBaseExpression().isExpressionBuilder()) {
                baseExpression = (ObjectExpression)baseExpression.getBaseExpression();
            }
            this.batchFetchPolicy.getAttributes().add(baseExpression.getName());
           
            // Ignore nested
            if (objectExpression.getBaseExpression().isExpressionBuilder()) {
                DatabaseMapping mapping = objectExpression.getMapping();
                if ((mapping != null) && mapping.isForeignReferenceMapping()) {
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     * This method is used when computing the nested queries for joined mappings.
     * It recurses computing the nested mapping queries and their join indexes.
     */
    protected void computeNestedQueriesForJoinedExpressions(List joinedExpressions, AbstractSession session, ObjectLevelReadQuery readQuery) {
        for (int index = 0; index < joinedExpressions.size(); index++) {
            ObjectExpression objectExpression = (ObjectExpression)joinedExpressions.get(index);

            // Expression may not have been initialized.
            objectExpression.getBuilder().setSession(session.getRootSession(null));
            if (objectExpression.getBuilder().getQueryClass() == null){
                objectExpression.getBuilder().setQueryClass(descriptor.getJavaClass());
            }
           
            // PERF: Cache join attribute names.
            ObjectExpression baseExpression = objectExpression;
            while (!baseExpression.getBaseExpression().isExpressionBuilder()) {
                baseExpression = (ObjectExpression)baseExpression.getBaseExpression();
            }
            this.addJoinedAttribute(baseExpression.getName());
           
            // Ignore nested
            if ((objectExpression.getBaseExpression() == objectExpression.getBuilder()) && objectExpression.getMapping().isForeignReferenceMapping()) {
                ForeignReferenceMapping mapping = (ForeignReferenceMapping)objectExpression.getMapping();

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Related Classes of org.eclipse.persistence.internal.expressions.ObjectExpression

  • org.eclipse.persistence.descriptors.ClassDescriptor
  • org.eclipse.persistence.internal.jpa.querydef.FromImpl
  • org.eclipse.persistence.internal.queries.JoinedAttributeManager
  • org.eclipse.persistence.mappings.DatabaseMapping
  • org.eclipse.persistence.mappings.ForeignReferenceMapping
  • org.eclipse.persistence.queries.ObjectLevelReadQuery
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