Examples of org.eclipse.persistence.queries.ObjectLevelReadQuery

org.eclipse.persistence.queries.ObjectLevelReadQuery

Purpose: Abstract class for all read queries using objects.
Description: Contains common behavior for all read queries using objects. @author Yvon Lavoie @since TOPLink/Java 1.0

            //assert !getCommitManager().isActive();
            // This will either throw an exception or do a logic only operation
            // (i.e. mark for later deletion if a deleteObjet query).
            boolean objectLevelRead = (query.isObjectLevelReadQuery() && !query.isReportQuery() && query.shouldMaintainCache());
            if (objectLevelRead) {
                ObjectLevelReadQuery readQuery = (ObjectLevelReadQuery)query;
                if (isAfterWriteChangesButBeforeCommit()) {
                    throw ValidationException.illegalOperationForUnitOfWorkLifecycle(getLifecycle(), "executeQuery(ObjectLevelReadQuery)");
                }
                Object result = readQuery.checkEarlyReturn(this, Record);


                if (result != null) {
                    if (result == InvalidObject.instance) {
                        return null;
                    }
                    return result;
                }


                // Must use the uow connection in these cases.
                // can be certain that commit manager not active as on client.
                if (readQuery.isLockQuery(this) && !wasTransactionBegunPrematurely()) {
                    beginEarlyTransaction();
                }
            } else if (query.isObjectLevelModifyQuery()) {
                return query.executeInUnitOfWork(this, Record);
            }

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            public void setAttributeValueInObject(Object object, Object value) {
                if (!(object instanceof ObjectLevelReadQuery)) {
                    return;
                }
                ObjectLevelReadQuery query = (ObjectLevelReadQuery)object;
                Expression expression = (Expression)value;
                if (expression != null) {
                    expression = expression.rebuildOn(query.getExpressionBuilder());
                }
                query.setSelectionCriteria(expression);
            }
        });
        expressionMapping.setReferenceClass(Expression.class);
        expressionMapping.setXPath(getSecondaryNamespaceXPath() + "criteria");
        descriptor.addMapping(expressionMapping);


        XMLCompositeCollectionMapping argumentsMapping = new XMLCompositeCollectionMapping();


        // Handle translation of argument lists to query-arguments.
        argumentsMapping.setAttributeAccessor(new AttributeAccessor() {
            public Object getAttributeValueFromObject(Object object) {
                DatabaseQuery query = (DatabaseQuery)object;
                List<String> arguments = query.getArguments();
                List<String> types = query.getArgumentTypeNames();
                List<Object> values = query.getArgumentValues();
                Vector queryArguments = new Vector(arguments.size());
                for (int index = 0; index < arguments.size(); index++) {
                    QueryArgument queryArgument = new QueryArgument();
                    queryArgument.setKey(arguments.get(index));
                    if (!types.isEmpty()) {
                        queryArgument.setTypeName(types.get(index));
                    }
                    if (!values.isEmpty()) {
                        queryArgument.setValue(values.get(index));
                    }
                    queryArguments.add(queryArgument);
                }
                return queryArguments;
            }


            public void setAttributeValueInObject(Object object, Object value) {
                DatabaseQuery query = (DatabaseQuery)object;
                List queryArguments = (List)value;
                List<String> arguments = new ArrayList<String>(queryArguments.size());
                List<Class> types = new ArrayList<Class>(queryArguments.size());
                List<Object> values = new ArrayList<Object>(queryArguments.size());
                for (int index = 0; index < queryArguments.size(); index++) {
                    QueryArgument queryArgument = (QueryArgument)queryArguments.get(index);
                    arguments.add((String)queryArgument.getKey());
                    if (queryArgument.getValue() != null) {
                        values.add(queryArgument.getValue());
                    }
                    if (queryArgument.getType() != null) {
                        types.add(queryArgument.getType());
                    }
                }
                query.setArguments(arguments);
                if (!types.isEmpty()) {
                    query.setArgumentTypes(types);
                }
                if (!values.isEmpty()) {
                    query.setArgumentValues(values);
                }
            }
        });
        argumentsMapping.setAttributeName("argumentsMapping");
        argumentsMapping.setXPath(getSecondaryNamespaceXPath() + "arguments/" + getSecondaryNamespaceXPath() + "argument");

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     * Clone and prepare the JoinedAttributeManager nested JoinedAttributeManager.
     * This is used for nested joining as the JoinedAttributeManager passed to the joined build object.
     */
    public ObjectLevelReadQuery prepareNestedJoins(JoinedAttributeManager joinManager, ObjectBuildingQuery baseQuery, AbstractSession session) {
        // A nested query must be built to pass to the descriptor that looks like the real query execution would.
        ObjectLevelReadQuery nestedQuery = (ObjectLevelReadQuery)((ObjectLevelReadQuery)getSelectionQuery()).deepClone();
        nestedQuery.setSession(session);
        nestedQuery.setShouldUseSerializedObjectPolicy(baseQuery.shouldUseSerializedObjectPolicy());
        // Must cascade for nested partial/join attributes, the expressions must be filter to only the nested ones.
        if (baseQuery.hasPartialAttributeExpressions()) {
            nestedQuery.setPartialAttributeExpressions(extractNestedExpressions(((ObjectLevelReadQuery)baseQuery).getPartialAttributeExpressions(), nestedQuery.getExpressionBuilder(), false));
            // bug 5501751: USING GETALLOWINGNULL() WITH ADDPARTIALATTRIBUTE() BROKEN IN 10.1.3
            // The query against Employee with 
            //   query.addPartialAttribute(builder.getAllowingNull("address"));
            // in case there's no address returns null instead of Address object.
            // Note that in case 
            //   query.addPartialAttribute(builder.getAllowingNull("address").get("city"));
            // in case there's no address an empty Address object (all atributes are nulls) is returned.
            if(nestedQuery.getPartialAttributeExpressions().isEmpty()) {
                if(hasRootExpressionThatShouldUseOuterJoin(((ObjectLevelReadQuery)baseQuery).getPartialAttributeExpressions())) {
                    nestedQuery.setShouldBuildNullForNullPk(true);
                }
            }
        } else {
            if(nestedQuery.getDescriptor().hasFetchGroupManager()) {
                FetchGroup sourceFG = baseQuery.getExecutionFetchGroup();
                if (sourceFG != null) {                    
                    FetchGroup targetFetchGroup = sourceFG.getGroup(getAttributeName());
                    if (targetFetchGroup != null) {
                        nestedQuery.setFetchGroup(targetFetchGroup);
                        nestedQuery.prepareFetchGroup();
                    }
                }
            }
            
            List nestedJoins = extractNestedExpressions(joinManager.getJoinedAttributeExpressions(), nestedQuery.getExpressionBuilder(), false);
            if (nestedJoins.size() > 0) {
                // Recompute the joined indexes based on the nested join expressions.
                nestedQuery.getJoinedAttributeManager().clear();
                nestedQuery.getJoinedAttributeManager().setJoinedAttributeExpressions_(nestedJoins);
                // the next line sets isToManyJoinQuery flag
                nestedQuery.getJoinedAttributeManager().prepareJoinExpressions(session);
                nestedQuery.getJoinedAttributeManager().computeJoiningMappingQueries(session);
                nestedQuery.getJoinedAttributeManager().computeJoiningMappingIndexes(true, session, 0);
            } else if (nestedQuery.hasJoining()) {
                // Clear any mapping level joins.
                nestedQuery.setJoinedAttributeManager(null);
            }
            // Configure nested locking clause.
            if (baseQuery.isLockQuery()) {
                if (((ObjectLevelReadQuery)baseQuery).getLockingClause().isForUpdateOfClause()) {
                    ForUpdateOfClause clause = (ForUpdateOfClause)((ObjectLevelReadQuery)baseQuery).getLockingClause().clone();
                    clause.setLockedExpressions(extractNestedExpressions(clause.getLockedExpressions(), nestedQuery.getExpressionBuilder(), true));
                    nestedQuery.setLockingClause(clause);
                } else {
                    nestedQuery.setLockingClause(((ObjectLevelReadQuery)baseQuery).getLockingClause());
                }
            }
        }
        nestedQuery.setShouldMaintainCache(baseQuery.shouldMaintainCache());
        nestedQuery.setShouldRefreshIdentityMapResult(baseQuery.shouldRefreshIdentityMapResult());


        // For flashback: Must still propagate all properties, as the
        // attributes of this joined attribute may be read later too.
        if (baseQuery.isObjectLevelReadQuery() && ((ObjectLevelReadQuery)baseQuery).hasAsOfClause()) {
            nestedQuery.setAsOfClause(((ObjectLevelReadQuery)baseQuery).getAsOfClause());
        }
        nestedQuery.setCascadePolicy(baseQuery.getCascadePolicy());
        if (nestedQuery.hasJoining()) {
            nestedQuery.getJoinedAttributeManager().computeJoiningMappingQueries(session);
        }
        nestedQuery.setSession(null);
        nestedQuery.setRequiresDeferredLocks(baseQuery.requiresDeferredLocks());


        return nestedQuery;
    }

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     * The nested query clones are stored on the execution (clone) joinManager to avoid cloning per row.
     */
    protected ObjectLevelReadQuery prepareNestedJoinQueryClone(AbstractRecord row, List dataResults, JoinedAttributeManager joinManager, ObjectBuildingQuery sourceQuery, AbstractSession executionSession) {
        // A nested query must be built to pass to the descriptor that looks like the real query execution would,
        // these should be cached on the query during prepare.
        ObjectLevelReadQuery nestedQuery = null;
        // This is also call for partial object reading.
        if (joinManager == null) {
            nestedQuery = prepareNestedJoins(joinManager, sourceQuery, executionSession);
            nestedQuery.setSession(executionSession);
            nestedQuery.setPrefetchedCacheKeys(sourceQuery.getPrefetchedCacheKeys());
            return nestedQuery;
        }
        // PERF: Also store the clone of the nested query on the execution query to avoid
        // cloning per row.
        if (joinManager.getJoinedMappingQueryClones() == null) {
            joinManager.setJoinedMappingQueryClones(new HashMap(5));
        }
        nestedQuery = joinManager.getJoinedMappingQueryClones().get(this);
        if (nestedQuery == null) {
            if (joinManager.getJoinedMappingQueries_() != null) {
                nestedQuery = joinManager.getJoinedMappingQueries_().get(this);
                nestedQuery = (ObjectLevelReadQuery)nestedQuery.clone();
            } else {
                nestedQuery = prepareNestedJoins(joinManager, sourceQuery, executionSession);
            }
            nestedQuery.setSession(executionSession);
            //CR #4365 - used to prevent infinite recursion on refresh object cascade all
            nestedQuery.setQueryId(joinManager.getBaseQuery().getQueryId());
            nestedQuery.setExecutionTime(joinManager.getBaseQuery().getExecutionTime());
            joinManager.getJoinedMappingQueryClones().put(this, nestedQuery);
        }
        nestedQuery.setPrefetchedCacheKeys(sourceQuery.getPrefetchedCacheKeys());
        // Must also set data results to the nested query if it uses to-many joining.
        if (nestedQuery.hasJoining() && nestedQuery.getJoinedAttributeManager().isToManyJoin()) {
            // The data results only of the child object are required, they must also be trimmed.
            List nestedDataResults = dataResults;
            if (nestedDataResults == null) {
                // Extract the primary key of the source object, to filter only the joined rows for that object.
                Object sourceKey = this.descriptor.getObjectBuilder().extractPrimaryKeyFromRow(row, executionSession);
                nestedDataResults = joinManager.getDataResultsByPrimaryKey().get(sourceKey);
            }
            nestedDataResults = new ArrayList(nestedDataResults);
            Object indexObject = joinManager.getJoinedMappingIndexes_().get(this);
            // Trim results to start at nested row index.
            for (int index = 0; index < nestedDataResults.size(); index++) {
                AbstractRecord sourceRow = (AbstractRecord)nestedDataResults.get(index);                        
                nestedDataResults.set(index, trimRowForJoin(sourceRow, indexObject, executionSession));
            }
            nestedQuery.getJoinedAttributeManager().setDataResults(nestedDataResults, executionSession);
        }
        nestedQuery.setRequiresDeferredLocks(sourceQuery.requiresDeferredLocks());
        return nestedQuery;
    }

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            super(QueryHints.BATCH, "");
        }
    
        DatabaseQuery applyToDatabaseQuery(Object valueToApply, DatabaseQuery query, ClassLoader loader, AbstractSession activeSession) {
            if (query.isObjectLevelReadQuery() && !query.isReportQuery()) {
                ObjectLevelReadQuery objectQuery = (ObjectLevelReadQuery)query;
                StringTokenizer tokenizer = new StringTokenizer((String)valueToApply, ".");
                if (tokenizer.countTokens() < 2){
                    throw QueryException.queryHintDidNotContainEnoughTokens(query, QueryHints.BATCH, valueToApply);
                }
                // ignore the first token since we are assuming an alias to the primary class
                // e.g. In e.phoneNumbers we will assume "e" refers to the base of the query
                String previousToken = tokenizer.nextToken();
                objectQuery.checkDescriptor(activeSession);
                ClassDescriptor descriptor = objectQuery.getDescriptor();
                Expression expression = objectQuery.getExpressionBuilder();
                while (tokenizer.hasMoreTokens()) {
                    String token = tokenizer.nextToken();
                    DatabaseMapping mapping = descriptor.getObjectBuilder().getMappingForAttributeName(token);
                    if (mapping == null) {
                        // Allow batching of subclass mappings.
                        if (!descriptor.hasInheritance()) {
                            throw QueryException.queryHintNavigatedNonExistantRelationship(query, QueryHints.BATCH, valueToApply, previousToken + "." + token);
                        }
                    } else if (!mapping.isForeignReferenceMapping() && !mapping.isAggregateObjectMapping()) {
                        throw QueryException.queryHintNavigatedIllegalRelationship(query, QueryHints.BATCH, valueToApply, previousToken + "." + token);
                    }
                    expression = expression.get(token);
                    previousToken = token;
                    if (mapping != null){
                        descriptor = mapping.getReferenceDescriptor();
                    }
                }
                objectQuery.addBatchReadAttribute(expression);
            } else {
                throw new IllegalArgumentException(ExceptionLocalization.buildMessage("ejb30-wrong-type-for-query-hint",new Object[]{getQueryId(query), name, getPrintValue(valueToApply)}));
            }
            return query;
        }

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            super(QueryHints.FETCH, "");
        }
    
        DatabaseQuery applyToDatabaseQuery(Object valueToApply, DatabaseQuery query, ClassLoader loader, AbstractSession activeSession) {
            if (query.isObjectLevelReadQuery() && !query.isReportQuery()) {
                ObjectLevelReadQuery olrq = (ObjectLevelReadQuery)query;
                StringTokenizer tokenizer = new StringTokenizer((String)valueToApply, ".");
                if (tokenizer.countTokens() < 2){
                    throw QueryException.queryHintDidNotContainEnoughTokens(query, QueryHints.FETCH, valueToApply);
                }
                // ignore the first token since we are assuming read all query
                // e.g. In e.phoneNumbers we will assume "e" refers to the base of the query
                String previousToken = tokenizer.nextToken();
                olrq.checkDescriptor(activeSession);
                ClassDescriptor descriptor = olrq.getDescriptor();
                Expression expression = olrq.getExpressionBuilder();
                while (tokenizer.hasMoreTokens()){
                    String token = tokenizer.nextToken();
                    ForeignReferenceMapping frMapping = null;
                    DatabaseMapping mapping = descriptor.getObjectBuilder().getMappingForAttributeName(token);
                    if (mapping == null){
                        throw QueryException.queryHintNavigatedNonExistantRelationship(query, QueryHints.FETCH, valueToApply, previousToken + "." + token);
                    } else if (!mapping.isForeignReferenceMapping()){
                        while (mapping.isAggregateObjectMapping() && tokenizer.hasMoreTokens()){
                            expression = expression.get(token);
                            token = tokenizer.nextToken();
                            descriptor = ((org.eclipse.persistence.mappings.AggregateObjectMapping)mapping).getReferenceDescriptor();
                            mapping = descriptor.getObjectBuilder().getMappingForAttributeName(token);
                        }
                        if (!mapping.isForeignReferenceMapping()){
                            throw QueryException.queryHintNavigatedIllegalRelationship(query, QueryHints.FETCH, valueToApply, previousToken + "." + token);
                        }
                    }
                    frMapping = (ForeignReferenceMapping)mapping;
                    descriptor = frMapping.getReferenceDescriptor();
                    if (frMapping.isCollectionMapping()){
                        expression = expression.anyOf(token, false);
                    } else {
                        expression = expression.get(token);
                    }
                    previousToken = token;
                }
                olrq.addJoinedAttribute(expression);
            } else {
                throw new IllegalArgumentException(ExceptionLocalization.buildMessage("ejb30-wrong-type-for-query-hint",new Object[]{getQueryId(query), name, getPrintValue(valueToApply)}));
            }
            return query;
        }

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            super(QueryHints.LEFT_FETCH, "");
        }
    
        DatabaseQuery applyToDatabaseQuery(Object valueToApply, DatabaseQuery query, ClassLoader loader, AbstractSession activeSession) {
            if (query.isObjectLevelReadQuery() && !query.isReportQuery()) {
                ObjectLevelReadQuery olrq = (ObjectLevelReadQuery)query;
                StringTokenizer tokenizer = new StringTokenizer((String)valueToApply, ".");
                if (tokenizer.countTokens() < 2){
                    throw QueryException.queryHintDidNotContainEnoughTokens(query, QueryHints.LEFT_FETCH, valueToApply);
                }
                // ignore the first token since we are assuming read all query
                // e.g. In e.phoneNumbers we will assume "e" refers to the base of the query
                String previousToken = tokenizer.nextToken();
                olrq.checkDescriptor(activeSession);
                ClassDescriptor descriptor = olrq.getDescriptor();
                Expression expression = olrq.getExpressionBuilder();
                while (tokenizer.hasMoreTokens()){
                    String token = tokenizer.nextToken();
                    ForeignReferenceMapping frMapping = null;
                    DatabaseMapping mapping = descriptor.getObjectBuilder().getMappingForAttributeName(token);
                    if (mapping == null){
                        throw QueryException.queryHintNavigatedNonExistantRelationship(query, QueryHints.LEFT_FETCH, valueToApply, previousToken + "." + token);
                    } else if (!mapping.isForeignReferenceMapping()){
                        while (mapping.isAggregateObjectMapping() && tokenizer.hasMoreTokens()){
                            expression = expression.get(token);
                            token = tokenizer.nextToken();
                            descriptor = ((org.eclipse.persistence.mappings.AggregateObjectMapping)mapping).getReferenceDescriptor();
                            mapping = descriptor.getObjectBuilder().getMappingForAttributeName(token);
                        }
                        if (!mapping.isForeignReferenceMapping()){
                            throw QueryException.queryHintNavigatedIllegalRelationship(query, QueryHints.LEFT_FETCH, valueToApply, previousToken + "." + token);
                        }
                    }
                    frMapping = (ForeignReferenceMapping)mapping;
                    descriptor = frMapping.getReferenceDescriptor();
                    if (frMapping.isCollectionMapping()){
                        expression = expression.anyOfAllowingNone(token, false);
                    } else {
                        expression = expression.getAllowingNull(token);
                    }
                    previousToken = token;
                }
                olrq.addJoinedAttribute(expression);
            } else {
                throw new IllegalArgumentException(ExceptionLocalization.buildMessage("ejb30-wrong-type-for-query-hint",new Object[]{getQueryId(query), name, getPrintValue(valueToApply)}));
            }
            return query;
        }

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     * INTERNAL:
     * Clone and prepare the JoinedAttributeManager nested JoinedAttributeManager.
     * This is used for nested joining as the JoinedAttributeManager passed to the joined build object.
     */
    public ObjectLevelReadQuery prepareNestedJoins(JoinedAttributeManager joinManager, ObjectBuildingQuery baseQuery, AbstractSession session) {
        ObjectLevelReadQuery nestedQuery = super.prepareNestedJoins(joinManager, baseQuery, session);
        nestedQuery.setShouldMaintainCache(false);
        return nestedQuery;
    }

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            this.getJoinedAttributeMappings().add(mapping);
            
            // focus on the base expression.  Nested queries will handle nested expressions, and only need to be processed once
            if (mapping.isForeignReferenceMapping() && !getJoinedMappingQueries_().containsKey(mapping)) {
                // A nested query must be built to pass to the descriptor that looks like the real query execution would.
                ObjectLevelReadQuery nestedQuery = ((ForeignReferenceMapping)mapping).prepareNestedJoins(this, readQuery, session);
                if (nestedQuery != null) {
                    // Register the nested query to be used by the mapping for all the objects.
                    getJoinedMappingQueries_().put(mapping, nestedQuery);
                }
                if (mapping.isCollectionMapping()){

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                // Direct-collection mappings do not have descriptor.
                if (mapping.isDirectCollectionMapping()) {
                    numberOfFields = 1;
                }
            } else {
                ObjectLevelReadQuery nestedQuery = getNestedJoinedMappingQuery(objectExpression);
                FetchGroup fetchGroup = null;
                if(descriptor.hasFetchGroupManager()) {
                    fetchGroup = nestedQuery.getExecutionFetchGroup();
                }
                if(fetchGroup != null) {
                    numberOfFields = nestedQuery.getFetchGroupNonNestedFieldsSet(mapping).size();
                } else {
                    if (objectExpression.isQueryKeyExpression() && objectExpression.isUsingOuterJoinForMultitableInheritance()) {
                        numberOfFields = descriptor.getAllSelectionFields(nestedQuery).size();
                    } else {
                        numberOfFields = descriptor.getSelectionFields(nestedQuery).size();

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org.eclipse.persistence.descriptors.ClassDescriptor

org.eclipse.persistence.descriptors.FetchGroupManager

org.eclipse.persistence.descriptors.InterfacePolicy

org.eclipse.persistence.descriptors.TablePerClassPolicy

org.eclipse.persistence.expressions.Expression

org.eclipse.persistence.expressions.ExpressionBuilder

org.eclipse.persistence.internal.databaseaccess.DatabaseCall

org.eclipse.persistence.internal.descriptors.OptimisticLockingPolicy

org.eclipse.persistence.internal.expressions.FieldExpression

org.eclipse.persistence.internal.expressions.ForUpdateOfClause

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