Examples of org.apache.cayenne.query.SQLResultSetMapping

org.apache.cayenne.query.SQLResultSetMapping
A metadata object that defines how a DataRow can be converted to result objects. This object provides mapping in a JPA-compliant manner, i.e. the DataRow is mapped either to a single Object or an Object[]. Each object (single result object or an array element object) can be a scalar or a Persistent object. @since 3.0 @author Andrus Adamchik

    
    /**
     * @since 3.0
     */
    public SQLResultSetMapping getResultSetMapping(String name) {
        SQLResultSetMapping result = resultSetMappingCache.get(name);


        if (result == null) {
            // reconstruct cache just in case some of the datamaps
            // have changed and now contain the required information
            constructCache();

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        compiled.setRootId(rootId);
        compiled.setDescriptorsById(descriptorsById);
        compiled.setIncomingById(incomingById);


        if (resultSetMappings != null) {
            SQLResultSetMapping mapping = new SQLResultSetMapping();


            for (int i = 0; i < resultSetMappings.size(); i++) {
                Object nextMapping = resultSetMappings.get(i);
                if (nextMapping instanceof String) {
                    mapping.addColumnResult((String) nextMapping);
                }
                else if (nextMapping instanceof EJBQLExpression) {
                    mapping.addEntityResult(compileEntityResult(
                            (EJBQLExpression) nextMapping,
                            i));
                }
            }

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            List<DataRow> mainRows = response.firstList();
            if (mainRows != null && !mainRows.isEmpty()) {


                ObjectConversionStrategy converter;


                SQLResultSetMapping rsMapping = metadata.getResultSetMapping();
                if (rsMapping == null) {
                    converter = new SingleObjectConversionStrategy();
                }
                else {


                    int entityResultCount = 0;
                    int columnResultCount = 0;
                    for (Object result : rsMapping.getResultDescriptors()) {
                        if (result instanceof String) {
                            columnResultCount++;
                        }
                        else {
                            entityResultCount++;

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        void convert(List<DataRow> mainRows) {


            List<DataRow> normalized;


            // convert data rows to standardized format...
            SQLResultSetMapping rsMapping = metadata.getResultSetMapping();
            if (rsMapping != null) {
                // expect 1 and only 1 entityMapping...
                EntityResult entityMapping = rsMapping.getEntityResult(0);
                normalized = toNormalizedDataRows(entityMapping, mainRows);
            }
            else {
                normalized = mainRows;
            }

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    class SingleScalarConversionStrategy extends ObjectConversionStrategy {


        @Override
        void convert(List<DataRow> mainRows) {


            SQLResultSetMapping rsMapping = metadata.getResultSetMapping();


            int rowsLen = mainRows.size();


            List objects = new ArrayList(rowsLen);
            String column = rsMapping.getColumnResult(0);


            // add scalars to the result
            for (DataRow row : mainRows) {
                objects.add(row.get(column));
            }

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        void convert(List<DataRow> mainRows) {


            int rowsLen = mainRows.size();
            List<Object[]> objects = new ArrayList<Object[]>(rowsLen);


            SQLResultSetMapping rsMapping = metadata.getResultSetMapping();


            // pass 1 - init Object[]'s and resolve scalars for each row


            int resultWidth = rsMapping.getResultDescriptors().size();
            int[] entityPositions = rsMapping.getEntityResultPositions();
            int[] columnPositions = rsMapping.getColumnResultPositions();


            for (DataRow row : mainRows) {
                Object[] resultRow = new Object[resultWidth];
                for (int i = 0; i < columnPositions.length; i++) {
                    int pos = columnPositions[i];
                    resultRow[pos] = row.get(rsMapping.getColumnResult(pos));
                }
                objects.add(resultRow);
            }


            // pass 2 - resolve individual object columns, and then update the rows...
            List[] resultLists = new List[entityPositions.length];
            for (int i = 0; i < entityPositions.length; i++) {
                int pos = entityPositions[i];
                EntityResult entityMapping = rsMapping.getEntityResult(pos);
                List<DataRow> normalized = toNormalizedDataRows(entityMapping, mainRows);


                List<Persistent> nextResult = toObjects(entityMapping
                        .getClassDescriptor(domain.getEntityResolver()), null, normalized);

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    /**
     * Returns a positional EntityResult, incrementing position index on each call.
     */
    EntityResult nextEntityResult() {


        SQLResultSetMapping resultSetMapping = compiledExpression.getResultSetMapping();
        if (resultSetMapping == null) {
            throw new EJBQLException(
                    "No result set mapping exists for expression, can't map EntityResult");
        }


        return resultSetMapping.getEntityResult(resultDescriptorPosition++);
    }

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    /**
     * Returns a positional column alias, incrementing position index on each call.
     */
    String nextColumnAlias() {


        SQLResultSetMapping resultSetMapping = compiledExpression.getResultSetMapping();
        if (resultSetMapping == null) {
            throw new EJBQLException(
                    "No result set mapping exists for expression, can't map column aliases");
        }


        return resultSetMapping.getColumnResult(resultDescriptorPosition++);
    }

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        @Override
        public boolean onStartNode(ProjectPath path) {
            JpaSqlResultSetMapping jpaMapping = (JpaSqlResultSetMapping) path.getObject();


            SQLResultSetMapping mapping = new SQLResultSetMapping(jpaMapping.getName());


            for (JpaColumnResult c : jpaMapping.getColumnResults()) {
                mapping.addColumnResult(c.getName());
            }


            for (JpaEntityResult e : jpaMapping.getEntityResults()) {


                EntityResult result = new EntityResult(e.getEntityClassName());

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    /**
     * @since 3.0
     */
    public SQLResultSetMapping getResultSetMapping(String name) {
        SQLResultSetMapping rsMapping = resultSetMappings.get(name);
        if (rsMapping != null) {
            return rsMapping;
        }


        return namespace != null ? namespace.getResultSetMapping(name) : null;

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org.apache.cayenne.access.DataDomainQueryAction

org.apache.cayenne.access.DataDomainQueryAction$MixedConversionStrategy

org.apache.cayenne.access.DataDomainQueryAction$SingleObjectConversionStrategy

org.apache.cayenne.access.DataDomainQueryAction$SingleScalarConversionStrategy

org.apache.cayenne.access.jdbc.EJBQLTranslationContext

org.apache.cayenne.ejbql.parser.Compiler

org.apache.cayenne.ejbql.parser.Compiler$SelectExpressionVisitor

org.apache.cayenne.jpa.bridge.DataMapConverter$JpaSQLResultSetMappingVisitor

org.apache.cayenne.map.DataMap

org.apache.cayenne.map.EntityResolver

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