Examples of org.eclipse.persistence.queries.ReadObjectQuery

org.eclipse.persistence.queries.ReadObjectQuery

Purpose: Concrete class for all read queries involving a single object.

Responsibilities: Return a single object for the query. Implements the inheritance feature when dealing with abstract descriptors. @author Yvon Lavoie @since TOPLink/Java 1.0

            }


            // PROCESS TRANSFORMATION MAPPINGS
            List transformationMappings = treeObjectBuilder.getTransformationMappings();
            if (null != transformationMappings) {
                ReadObjectQuery query = new ReadObjectQuery();
                query.setSession(session);
                for (int x = 0, transformationMappingsSize = transformationMappings.size(); x < transformationMappingsSize; x++) {
                    AbstractTransformationMapping transformationMapping = (AbstractTransformationMapping)transformationMappings.get(x);
                    transformationMapping.readFromRowIntoObject(transformationRecord, null, currentObject, null, query, session, true);
                }
            }

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                    // value read query
                    databaseQueryToInitialize = new ValueReadQuery();
                }
                else {
                    // read object query for the class mapped to the type
                    databaseQueryToInitialize = new ReadObjectQuery(xrService.getTypeClass(type));
                }
            }
        }
        else {
            databaseQueryToInitialize = new DataModifyQuery();

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                int cacheUsage = ((Integer)valueToApply).intValue();
                ((ObjectLevelReadQuery)query).setCacheUsage(cacheUsage);
                if (cacheUsage == ObjectLevelReadQuery.CheckCacheByExactPrimaryKey
                        || cacheUsage == ObjectLevelReadQuery.CheckCacheByPrimaryKey
                        || cacheUsage == ObjectLevelReadQuery.CheckCacheThenDatabase) {
                    ReadObjectQuery newQuery = new ReadObjectQuery();
                    newQuery.copyFromQuery(query);
                    return newQuery;
                }
            } else if (query.isModifyAllQuery()) {
                int cacheUsage = ((Integer)valueToApply).intValue();
                ((ModifyAllQuery)query).setCacheUsage(cacheUsage);

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            // Allows an query type, or a custom query class.
            DatabaseQuery newQuery = query;
            if (valueToApply.equals(QueryType.ReadAll)) {
                newQuery = new ReadAllQuery();
            } else if (valueToApply.equals(QueryType.ReadObject)) {
                newQuery = new ReadObjectQuery();
            } else if (valueToApply.equals(QueryType.Report)) {
                newQuery = new ReportQuery();
                if (query.isObjectLevelReadQuery()) {
                    ((ReportQuery)newQuery).addAttribute("root", ((ReportQuery)newQuery).getExpressionBuilder());
                }

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                        if (!xrService.descriptorsByQName.containsKey(type)) {
                            databaseQueryToInitialize = new ValueReadQuery();
                        }
                        else {
                            // read object query for the class mapped to the type
                            databaseQueryToInitialize = new ReadObjectQuery(xrService.getTypeClass(type));
                        }
                    }
                    else {
                        // special case - no out args for SP: the return
                        // will be a single int
                        // rowcount
                        databaseQueryToInitialize = new DataModifyQuery();
                    }
                }
                else {
                    if (!xrService.descriptorsByQName.containsKey(type)) {
                      if (type.equals(SXF_QNAME)) {
                        databaseQueryToInitialize = new DataReadQuery();
                      }
                      else {
                        databaseQueryToInitialize = new ValueReadQuery();
                      }
                    }
                    else {
                        // read object query for the class mapped to the type
                        databaseQueryToInitialize = new ReadObjectQuery(xrService.getTypeClass(type));
                    }
                }
            }
        }
        else {

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        // for XMLObjectReferenceMappings we need a non-shared cache, so
        // try and get a Unit Of Work from the XMLContext
        AbstractSession readSession = xmlContext.getReadSession(referenceClass);


        ReadObjectQuery query = new ReadObjectQuery();
        query.setReferenceClass(referenceClass);
        query.setSession(readSession);


        XMLDescriptor descriptor = (XMLDescriptor) readSession.getDescriptor(referenceClass);
        if (descriptor == null) {
            throw XMLMarshalException.descriptorNotFoundInProject(referenceClass.getName());
        }

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    /**
     * INTERNAL:
     */
    protected ReadObjectQuery getQuery() {
        if (m_query == null) {
            m_query = new ReadObjectQuery(m_parentClass);
            
            Expression selectionCriteria = null;
            Iterator keys = m_queryKeyFields.keySet().iterator();
            ExpressionBuilder builder = new ExpressionBuilder();

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            primaryKeyValues = policy.createPkVectorFromKey(primaryKey, session);
        }
        
        // Get the read object query and apply the properties to it.
        // PERF: use descriptor defined query to avoid extra query creation.
        ReadObjectQuery query = descriptor.getQueryManager().getReadObjectQuery();
        
        if (query == null) {
            // The properties/query hints and setIsExecutionClone etc. is set
            // in the getReadObjectQuery.
            query = getReadObjectQuery(descriptor.getJavaClass(), primaryKeyValues, properties);
        } else {
            query.checkPrepare(session, null);
            query = (ReadObjectQuery)query.clone();
            
            // Apply the properties if there are some.
            QueryHintsHandler.apply(properties, query, session.getLoader());
            
            query.setIsExecutionClone(true);
            query.setSelectionKey(primaryKeyValues);
        }
        
        // Apply any EclipseLink defaults if they haven't been set through
        // the properties.
        if (properties == null || ! properties.containsKey(QueryHints.CACHE_USAGE)) {
            query.conformResultsInUnitOfWork();
        }
        
        return executeQuery(query, lockMode, (UnitOfWork) session);
    }

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            if (! contains(entity, uow)) {
                throw new IllegalArgumentException(ExceptionLocalization.buildMessage("cant_refresh_not_managed_object", new Object[] { entity }));
            }


            // Get the read object query and apply the properties to it.        
            ReadObjectQuery query = getReadObjectQuery(entity, properties);
            
            // Apply any EclipseLink defaults if they haven't been set through
            // the properties.
            if (properties == null || ! properties.containsKey(QueryHints.REFRESH)) {
                query.refreshIdentityMapResult();
            }
            
            if (properties == null || ! properties.containsKey(QueryHints.REFRESH_CASCADE)) {
                query.cascadeByMapping();
            }
            
            Object refreshedEntity = executeQuery(query, lockMode, uow);
            if (refreshedEntity == null) {
                // bug5955326, ReadObjectQuery will now ensure the object is invalidated if refresh returns null.

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    /**
     * Build a selection query for the primary key values.
     */
    protected ReadObjectQuery getReadObjectQuery(Class referenceClass, List primaryKeyValues, Map properties) {
        ReadObjectQuery query = getReadObjectQuery(properties);
        query.setReferenceClass(referenceClass);
        query.setSelectionKey(primaryKeyValues);
        return query;
    }

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Related Classes of org.eclipse.persistence.queries.ReadObjectQuery

org.eclipse.persistence.descriptors.ClassDescriptor

org.eclipse.persistence.descriptors.DescriptorQueryManager

org.eclipse.persistence.descriptors.InterfacePolicy

org.eclipse.persistence.dynamic.DynamicHelper

org.eclipse.persistence.internal.descriptors.CascadeLockingPolicy

org.eclipse.persistence.internal.dynamic.DynamicEntityImpl

org.eclipse.persistence.internal.identitymaps.CacheId

org.eclipse.persistence.internal.jpa.EJBQueryImpl

org.eclipse.persistence.internal.jpa.EntityManagerImpl

org.eclipse.persistence.internal.jpa.QueryHintsHandler$CacheUsageHint

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