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package oracle.toplink.essentials.internal.ejb.cmp3.base;
import java.util.*;
import oracle.toplink.essentials.ejb.cmp3.EJBQuery;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.helper.ClassConstants;
import oracle.toplink.essentials.internal.helper.Helper;
import oracle.toplink.essentials.internal.helper.BasicTypeHelperImpl;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.sessions.Session;
import oracle.toplink.essentials.internal.parsing.EJBQLParseTree;
import oracle.toplink.essentials.internal.parsing.ejbql.*;
import oracle.toplink.essentials.internal.localization.ExceptionLocalization;
import oracle.toplink.essentials.sessions.DatabaseRecord;
/**
* Concrete EJB 3.0 query class
*
* To do:
* Internationalize exceptions
* Change TopLink exceptions to exception types used by the spec
* Named Parameters
* Report Query
* firstResultIndex set in query framework
* temporal type parameters
* Change single result to use ReadObjectQuery
**/
public abstract class EJBQueryImpl {
protected DatabaseQuery databaseQuery = null;
protected EntityManagerImpl entityManager = null;
protected String queryName = null;
protected Map parameters = null;
protected int firstResultIndex = -1; // -1 indicates undefined
protected int maxResults = -1; // -1 indicates undefined
protected int maxRows = -1; // -1 indicates undefined
abstract protected void throwNoResultException(String message);
abstract protected void throwNonUniqueResultException(String message);
/**
* Base constructor for EJBQueryImpl. Initializes basic variables.
*/
protected EJBQueryImpl(EntityManagerImpl entityManager) {
parameters = new HashMap();
this.entityManager = entityManager;
}
/**
* Create an EJBQueryImpl with a TopLink query.
* @param query
*/
public EJBQueryImpl(DatabaseQuery query, EntityManagerImpl entityManager) {
this(entityManager);
this.databaseQuery = query;
}
/**
* Build an EJBQueryImpl based on the given ejbql string
* @param ejbql
* @param entityManager
*/
public EJBQueryImpl(String ejbql, EntityManagerImpl entityManager) {
this(ejbql, entityManager, false);
}
/**
* Create an EJBQueryImpl with either a query name or an ejbql string
* @param queryDescription
* @param entityManager
* @param isNamedQuery determines whether to treat the query description as ejbql or a query name
*/
public EJBQueryImpl(String queryDescription, EntityManagerImpl entityManager, boolean isNamedQuery) {
this(entityManager);
if (isNamedQuery) {
this.queryName = queryDescription;
} else {
if (databaseQuery == null) {
databaseQuery = buildEJBQLDatabaseQuery(queryDescription, getActiveSession());
}
}
}
/**
* Internal method to change the wrapped query to a DataModifyQuery if neccessary
*/
protected void setAsSQLModifyQuery(){
if (getDatabaseQuery().isDataReadQuery()){
DataModifyQuery query = new DataModifyQuery();
query.setSQLString(databaseQuery.getSQLString());
query.setIsUserDefined(databaseQuery.isUserDefined());
query.setFlushOnExecute(databaseQuery.getFlushOnExecute());
databaseQuery = query;
}
}
/**
* Internal method to change the wrapped query to a DataReadQuery if neccessary
*/
protected void setAsSQLReadQuery(){
if(getDatabaseQuery().isDataModifyQuery()){
DataReadQuery query = new DataReadQuery();
query.setUseAbstractRecord(false);
query.setSQLString(databaseQuery.getSQLString());
query.setIsUserDefined(databaseQuery.isUserDefined());
query.setFlushOnExecute(databaseQuery.getFlushOnExecute());
databaseQuery = query;
}
}
/**
* Build a DatabaseQuery from an EJBQL string.
* @param ejbql
* @param session the session to get the descriptors for this query for.
* @return a DatabaseQuery representing the given ejbql
*/
public static DatabaseQuery buildEJBQLDatabaseQuery(String ejbql, Session session) {
return buildEJBQLDatabaseQuery(ejbql, null, session);
}
/**
* Build a DatabaseQuery from an EJBQL string.
*
* @param ejbql
* @param session the session to get the descriptors for this query for.
* @param hints a list of hints to be applied to the query
* @return a DatabaseQuery representing the given ejbql
*/
public static DatabaseQuery buildEJBQLDatabaseQuery(String ejbql, Session session, HashMap hints) {
return buildEJBQLDatabaseQuery(null, ejbql, null, session, hints, null);
}
/**
* Build a DatabaseQuery from an EJBQL string.
*
* @param ejbql
* @param session the session to get the descriptors for this query for.
* @param hints a list of hints to be applied to the query
* @param classLoader the class loader to build the query with
* @return a DatabaseQuery representing the given ejbql
*/
public static DatabaseQuery buildEJBQLDatabaseQuery(String ejbql, Session session, HashMap hints, ClassLoader classLoader) {
return buildEJBQLDatabaseQuery(null, ejbql, null, session, hints, classLoader);
}
/**
* Build a DatabaseQuery from an EJBQL string.
* @param ejbql
* @parem flushOnExecute
* @param session the session to get the descriptors for this query for.
* @return a DatabaseQuery representing the given ejbql
*/
public static DatabaseQuery buildEJBQLDatabaseQuery(String ejbql, Boolean flushOnExecute, Session session) {
return buildEJBQLDatabaseQuery(null, ejbql, flushOnExecute, session, null, null);
}
/**
* Build a DatabaseQuery from an EJBQL string.
* @param ejbql
* @parem flushOnExecute
* @param session the session to get the descriptors for this query for.
* @return a DatabaseQuery representing the given ejbql
*/
public static DatabaseQuery buildEJBQLDatabaseQuery(String ejbql, Boolean flushOnExecute, Session session, ClassLoader classLoader) {
return buildEJBQLDatabaseQuery(null, ejbql, flushOnExecute, session, null, classLoader);
}
/**
* Build a DatabaseQuery from an EJBQL string.
*
* @param ejbql
* @parem flushOnExecute
* @param session the session to get the descriptors for this query for.
* @param hints a list of hints to be applied to the query
* @return a DatabaseQuery representing the given ejbql
*/
public static DatabaseQuery buildEJBQLDatabaseQuery(String queryName, String ejbql,
Boolean flushOnExecute, Session session, HashMap hints, ClassLoader classLoader) {
DatabaseQuery databaseQuery = null;
EJBQLParseTree parseTree = EJBQLParser.buildParseTree(queryName, ejbql);
parseTree.setClassLoader(classLoader);
databaseQuery = parseTree.createDatabaseQuery();
databaseQuery.setEJBQLString(ejbql);
parseTree.populateQuery(databaseQuery, (oracle.toplink.essentials.internal.sessions.AbstractSession)session);
//Bug#4646580 Add arguments to query
parseTree.addParametersToQuery(databaseQuery);
((EJBQLCallQueryMechanism)databaseQuery.getQueryMechanism()).getEJBQLCall().setIsParsed(true);
databaseQuery.setFlushOnExecute(flushOnExecute);
//GF#1324 toplink.refresh query hint does not cascade
//cascade by mapping as default for read query
if(databaseQuery.isReadQuery ()) {
databaseQuery.cascadeByMapping();
}
// apply any query hints
applyHints(hints, databaseQuery);
return databaseQuery;
}
/**
* Build a ReadAllQuery from a class and sql string.
*
* @param resultClass
* @param flushOnExecute
* @param sqlString
* @return
*/
public static DatabaseQuery buildSQLDatabaseQuery(Class resultClass, String sqlString) {
return buildSQLDatabaseQuery(resultClass, sqlString, null);
}
/**
* Build a ReadAllQuery from a class and sql string.
*
* @param resultClass
* @param flushOnExecute
* @param sqlString
* @param hints a list of hints to be applied to the query
* @return
*/
public static DatabaseQuery buildSQLDatabaseQuery(Class resultClass, String sqlString, HashMap hints) {
ReadAllQuery query = new ReadAllQuery(resultClass);
query.setSQLString(sqlString);
query.setIsUserDefined(true);
// apply any query hints
applyHints(hints, query);
return query;
}
/**
* Build a ResultSetMappingQuery from a sql result set mapping name and sql string.
*
* @param sqlResultSetMappingName
* @param flushOnExecute
* @param sqlString
* @return
*/
public static DatabaseQuery buildSQLDatabaseQuery(String sqlResultSetMappingName, String sqlString) {
return buildSQLDatabaseQuery(sqlResultSetMappingName, sqlString, null);
}
/**
* Build a ResultSetMappingQuery from a sql result set mapping name and sql string.
*
* @param sqlResultSetMappingName
* @param flushOnExecute
* @param sqlString
* @param hints a list of hints to be applied to the query
* @return
*/
public static DatabaseQuery buildSQLDatabaseQuery(String sqlResultSetMappingName, String sqlString, HashMap hints) {
ResultSetMappingQuery query = new ResultSetMappingQuery();
query.setSQLResultSetMappingName(sqlResultSetMappingName);
query.setSQLString(sqlString);
query.setIsUserDefined(true);
// apply any query hints
applyHints(hints, query);
return query;
}
/**
* Build a DataReadQuery from a sql string.
*/
public static DatabaseQuery buildSQLDatabaseQuery(String sqlString, Boolean flushOnExecute) {
return buildSQLDatabaseQuery(sqlString, new HashMap());
}
/**
* Build a DataReadQuery from a sql string.
*/
public static DatabaseQuery buildSQLDatabaseQuery(String sqlString, HashMap hints) {
DataReadQuery query = new DataReadQuery();
query.setUseAbstractRecord(false);
query.setSQLString(sqlString);
query.setIsUserDefined(true);
// apply any query hints
applyHints(hints, query);
return query;
}
/**
* Execute a ReadQuery by assigning the stored parameter values and running it
* in the database
* @return the results of the query execution
*/
protected Object executeReadQuery() {
Vector parameterValues = processParameters();
//TODO: the following performFlush() call is a temporary workaround for bug 4752493:
// CTS: INMEMORY QUERYING IN EJBQUERY BROKEN DUE TO CHANGE TO USE REPORTQUERY.
// Ideally we should only flush in case the selectionExpression can't be conformed in memory.
// There are two alternative ways to implement that:
// 1. Try running the query with conformInUOW flag first - if it fails with
// QueryException.cannotConformExpression then flush and run the query again -
// now without conforming.
// 2. Implement a new isComformable method on Expression which would determine whether the expression
// could be conformed in memory, flush only in case it returns false.
// Note that doesConform method currently implemented on Expression
// requires object(s) to be confirmed as parameter(s).
// The new isComformable method should not take any objects as parameters,
// it should return false if there could be such an object that
// passed to doesConform causes it to throw QueryException.cannotConformExpression -
// and true otherwise.
boolean shouldResetConformResultsInUnitOfWork = false;
if(isFlushModeAUTO()) {
performPreQueryFlush();
if(getDatabaseQuery().isObjectLevelReadQuery()) {
if(((ObjectLevelReadQuery)getDatabaseQuery()).shouldConformResultsInUnitOfWork()) {
((ObjectLevelReadQuery)getDatabaseQuery()).setCacheUsage(ObjectLevelReadQuery.UseDescriptorSetting);
shouldResetConformResultsInUnitOfWork = true;
}
}
}
try {
// in case it's a user-defined query
if(getDatabaseQuery().isUserDefined()) {
// and there is an active transaction
if(this.entityManager.checkForTransaction(false) != null) {
// verify whether uow has begun early transaction
if(!((oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl)getActiveSession()).wasTransactionBegunPrematurely()) {
// uow begins early transaction in case it hasn't already begun.
((oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl)getActiveSession()).beginEarlyTransaction();
}
}
}
return getActiveSession().executeQuery(getDatabaseQuery(), parameterValues);
} finally {
if(shouldResetConformResultsInUnitOfWork) {
((ObjectLevelReadQuery)getDatabaseQuery()).conformResultsInUnitOfWork();
}
}
}
/**
* Execute an update or delete statement.
* @return the number of entities updated or deleted
*/
public int executeUpdate() {
try {
//bug51411440: need to throw IllegalStateException if query executed on closed em
entityManager.verifyOpen();
setAsSQLModifyQuery();
//bug:4294241, only allow modify queries - UpdateAllQuery prefered
if ( !(getDatabaseQuery() instanceof ModifyQuery) ){
throw new IllegalStateException(ExceptionLocalization.buildMessage("incorrect_query_for_execute_update"));
}
// need to throw TransactionRequiredException if there is no active transaction
entityManager.checkForTransaction(true);
//fix for bug:4288845, did not add the parameters to the query
Vector parameterValues = processParameters();
if(isFlushModeAUTO()) {
performPreQueryFlush();
}
Integer changedRows = (Integer)((Session)getActiveSession()).executeQuery(databaseQuery, parameterValues);
return changedRows.intValue();
} catch (RuntimeException e) {
setRollbackOnly();
throw e;
}
}
/**
* Return the cached database query for this EJBQueryImpl. If the query is
* a named query and it has not yet been looked up, the query will be looked up
* and stored as the cached query.
*/
public DatabaseQuery getDatabaseQuery() {
if ((queryName != null) && (databaseQuery == null)) {
// need error checking and appropriate exception for non-existing query
databaseQuery = getActiveSession().getQuery(queryName);
if (databaseQuery != null) {
if (!databaseQuery.isPrepared()){
//prepare the query before cloning, this ensures we do not have to continually prepare on each usage
databaseQuery.prepareCall(getActiveSession(), new DatabaseRecord());
}
//Bug5040609 Make a clone of the original DatabaseQuery for this EJBQuery
databaseQuery = (DatabaseQuery)databaseQuery.clone();
} else {
throw new IllegalArgumentException(ExceptionLocalization.buildMessage("unable_to_find_named_query", new Object[] {queryName}));
}
}
return databaseQuery;
}
/**
* Non-standard method to return results of a ReadQuery that has a containerPoliry
* that returns objects as a collection rather than a List
* @return Collection of results
*/
public Collection getResultCollection() {
//bug51411440: need to throw IllegalStateException if query executed on closed em
entityManager.verifyOpen();
setAsSQLReadQuery();
propagateResultProperties();
//bug:4297903, check container policy class and throw exception if its not the right type
if (getDatabaseQuery() instanceof ReadAllQuery){
Class containerClass = ((ReadAllQuery)getDatabaseQuery()).getContainerPolicy().getContainerClass();
if (! Helper.classImplementsInterface(containerClass, ClassConstants.Collection_Class)){
throw QueryException.invalidContainerClass( containerClass, ClassConstants.Collection_Class );
}
} else if (getDatabaseQuery() instanceof ReadObjectQuery){
//bug:4300879, no support for ReadObjectQuery if a collection is required
throw QueryException.incorrectQueryObjectFound( getDatabaseQuery(), ReadAllQuery.class );
} else if (!(getDatabaseQuery() instanceof ReadQuery)){
throw new IllegalStateException(ExceptionLocalization.buildMessage("incorrect_query_for_get_result_collection"));
}
Object result = executeReadQuery();
return (Collection)result;
}
/**
* Execute the query and return the query results
* as a List.
* @return a list of the results
*/
public List getResultList() {
try {
//bug51411440: need to throw IllegalStateException if query executed on closed em
entityManager.verifyOpen();
setAsSQLReadQuery();
propagateResultProperties();
//bug:4297903, check container policy class and throw exception if its not the right type
if (getDatabaseQuery() instanceof ReadAllQuery){
Class containerClass = ((ReadAllQuery)getDatabaseQuery()).getContainerPolicy().getContainerClass();
if (! Helper.classImplementsInterface(containerClass, ClassConstants.List_Class)){
throw QueryException.invalidContainerClass( containerClass, ClassConstants.List_Class );
}
} else if (getDatabaseQuery() instanceof ReadObjectQuery){
//bug:4300879, handle ReadObjectQuery returning null
throw QueryException.incorrectQueryObjectFound( getDatabaseQuery(), ReadAllQuery.class );
} else if (!(getDatabaseQuery() instanceof ReadQuery)){
throw new IllegalStateException(ExceptionLocalization.buildMessage("incorrect_query_for_get_result_list"));
}
Object result = executeReadQuery();
return (List)result;
} catch (RuntimeException e) {
setRollbackOnly();
throw e;
}
}
/**
* Execute a query that returns a single result.
* @return the result
* @throws EntityNotFoundException if there is no result
* @throws NonUniqueResultException if more than one result
*/
public Object getSingleResult() {
boolean rollbackOnException = true;
try {
//bug51411440: need to throw IllegalStateException if query executed on closed em
entityManager.verifyOpen();
setAsSQLReadQuery();
propagateResultProperties();
//bug:4301674, requires lists to be returned from ReadAllQuery objects
if (getDatabaseQuery() instanceof ReadAllQuery){
Class containerClass = ((ReadAllQuery)getDatabaseQuery()).getContainerPolicy().getContainerClass();
if (! Helper.classImplementsInterface(containerClass, ClassConstants.List_Class)){
throw QueryException.invalidContainerClass( containerClass, ClassConstants.List_Class );
}
} else if (!(getDatabaseQuery() instanceof ReadQuery)){
throw new IllegalStateException(ExceptionLocalization.buildMessage("incorrect_query_for_get_single_result"));
}
Object result = executeReadQuery();
if (result instanceof List){
List results = (List)result;
if (results.isEmpty()) {
rollbackOnException = false;
throwNoResultException(ExceptionLocalization.buildMessage("no_entities_retrieved_for_get_single_result", (Object[])null));
} else if (results.size() > 1) {
rollbackOnException = false;
throwNonUniqueResultException(ExceptionLocalization.buildMessage("too_many_results_for_get_single_result", (Object[])null));
}
return results.get(0);
}else{
if (result == null) {
rollbackOnException = false;
throwNoResultException(ExceptionLocalization.buildMessage("no_entities_retrieved_for_get_single_result", (Object[])null));
}
return result;
}
} catch (RuntimeException e) {
if(rollbackOnException) {
setRollbackOnly();
}
throw e;
}
}
/**
* Internal method to add the parameters values to the query prior to execution.
* Returns a list of parameter values in the order the parameters are
* defined for the databaseQuery.
*/
protected Vector processParameters() {
if (databaseQuery == null) {
getDatabaseQuery();
}
List arguments = databaseQuery.getArguments();
if (arguments.isEmpty()) {
Iterator params = parameters.keySet().iterator();
while (params.hasNext()) {
databaseQuery.addArgument((String)params.next());
}
arguments = databaseQuery.getArguments();
}
// now create parameterValues in the same order as the argument list
Vector parameterValues = new Vector(arguments.size());
for (Iterator i = arguments.iterator(); i.hasNext();) {
String name = (String)i.next();
if (parameters.containsKey(name)) {
parameterValues.add(parameters.get(name));
} else {
// Error: missing actual parameter value
throw new IllegalStateException(ExceptionLocalization.buildMessage("missing_parameter_value", new Object[]{name}));
}
}
return parameterValues;
}
/**
* Replace the cached query with the given query.
*/
public void setDatabaseQuery(DatabaseQuery query) {
databaseQuery = query;
}
/**
* Set the position of the first result to retrieve.
* @param start position of the first result, numbered from 0
*/
protected void setFirstResultInternal(int startPosition) {
if (startPosition < 0) {
throw new IllegalArgumentException(ExceptionLocalization.buildMessage("negative_start_position", (Object[])null));
}
firstResultIndex = startPosition;
}
/**
* Set implementation-specific hints.
*
* @param hints a list of hints to be applied to the query
* @param query the query to apply the hints to
*/
protected static void applyHints(HashMap hints, DatabaseQuery query) {
QueryHintsHandler.apply(hints, query);
}
/**
* Spec. 3.5.2:
* "FlushMode.AUTO is set on the Query object, or if
* the flush mode setting for the persistence context is AUTO (the default)
* and a flush mode setting has not been specified for the Query object,
* the persistence provider is responsible for ensuring that all updates
* to the state of all entities in the persistence context which could potentially
* affect the result of the query are visible to the processing of the query."
*/
protected boolean isFlushModeAUTO() {
if(getDatabaseQuery().getFlushOnExecute() != null) {
return getDatabaseQuery().getFlushOnExecute().booleanValue();
} else {
return entityManager.isFlushModeAUTO();
}
}
/**
* Set an implementation-specific hint.
* If the hint name is not recognized, it is silently ignored.
* @param hintName
* @param value
* @throws IllegalArgumentException if the second argument is not
* valid for the implementation
*/
protected void setHintInternal(String hintName, Object value) {
QueryHintsHandler.apply(hintName, value, getDatabaseQuery());
}
/**
* Set the maximum number of results to retrieve.
* @param maxResult
*/
public void setMaxResultsInternal(int maxResult) {
if (maxResult < 0) {
throw new IllegalArgumentException(ExceptionLocalization.buildMessage("negative_max_result", (Object[])null));
}
this.maxResults = maxResult;
}
/** */
protected void propagateResultProperties() {
DatabaseQuery databaseQuery = getDatabaseQuery();
if (databaseQuery.isReadQuery()) {
ReadQuery readQuery = (ReadQuery)databaseQuery;
if (maxResults >= 0) {
maxRows = maxResults + ((firstResultIndex >= 0) ? firstResultIndex : 0);
readQuery.setMaxRows(maxRows);
maxResults = -1;
}
if (firstResultIndex > -1) {
readQuery.setFirstResult(firstResultIndex);
firstResultIndex = -1;
}
}
}
/**
* Bind an argument to a named parameter.
* @param name the parameter name
* @param value
*/
protected void setParameterInternal(String name, Object value) {
int index = getDatabaseQuery().getArguments().indexOf(name);
if (getDatabaseQuery().getEJBQLString() != null){ //only non native queries
if (index == -1){
throw new IllegalArgumentException(ExceptionLocalization.buildMessage("ejb30-wrong-argument-name",new Object[]{name, getDatabaseQuery().getEJBQLString()}));
}
if (!isValidActualParameter(value, getDatabaseQuery().getArgumentTypes().get(index))) {
throw new IllegalArgumentException(ExceptionLocalization.buildMessage("ejb30-incorrect-parameter-type", new Object[] {name, value.getClass(), getDatabaseQuery().getArgumentTypes().get(index), getDatabaseQuery().getEJBQLString()}));
}
}
parameters.put(name, value);
}
/**
* Bind an argument to a positional parameter.
* @param position
* @param value
*/
protected void setParameterInternal(int position, Object value) {
String pos = (new Integer(position)).toString();
int index = getDatabaseQuery().getArguments().indexOf(pos);
if (getDatabaseQuery().getEJBQLString() != null){ //only non native queries
if (index == -1) {
throw new IllegalArgumentException(ExceptionLocalization.buildMessage("ejb30-wrong-argument-index", new Object[]{position, getDatabaseQuery().getEJBQLString()}));
}
if (!isValidActualParameter(value, getDatabaseQuery().getArgumentTypes().get(index))) {
throw new IllegalArgumentException(ExceptionLocalization.buildMessage("ejb30-incorrect-parameter-type", new Object[] {position, value.getClass(), getDatabaseQuery().getArgumentTypes().get(index), getDatabaseQuery().getEJBQLString()}));
}
}
parameters.put(pos, value);
}
protected boolean isValidActualParameter(Object value, Object parameterType) {
if (value == null) {
return true;
} else {
return BasicTypeHelperImpl.getInstance().isAssignableFrom(parameterType, value.getClass());
}
}
protected Session getActiveSession() {
return entityManager.getActiveSession();
}
protected void performPreQueryFlush(){
if (this.entityManager.shouldFlushBeforeQuery()){
this.entityManager.flush();
}
}
protected void setRollbackOnly() {
entityManager.setRollbackOnly();
}
}
