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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
* INTERNAL
* Purpose: This represents an EJBQL parse tre
*
Responsibilities:
* - Maintain the context for the expression generation
*
- Build an initial expression
*
- Return a reference class for the expression
*
- Maintain the root node for the query
*
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class EJBQLParseTree extends ParseTree {
/**
* EJBQLParseTree constructor comment.
*/
public EJBQLParseTree() {
super();
}
/**
* INTERNAL
* Build the context to be used when generating the expression from the parse tree
*/
public GenerationContext buildContext(ReadQuery readQuery, AbstractSession session) {
GenerationContext contextForGeneration = super.buildContext(readQuery, session);
contextForGeneration.setBaseQueryClass(readQuery.getReferenceClass());
return contextForGeneration;
}
/**
* INTERNAL
* Build the context to be used when generating the expression from the
* subquery parse tree.
*/
private GenerationContext buildSubqueryContext(ReadQuery readQuery, GenerationContext outer) {
GenerationContext context = new SelectGenerationContext(outer, this);
context.setBaseQueryClass(readQuery.getReferenceClass());
return context;
}
/**
* Add all of the relevant query settings from an EJBQLParseTree to the given
* database query.
* @param query The query to populate
* @param outer the GenerationContext of the outer EJBQL query.
* @return the GenerationContext for the subquery
*/
public GenerationContext populateSubquery(ObjectLevelReadQuery readQuery, GenerationContext outer) {
GenerationContext innerContext = buildSubqueryContext(readQuery, outer);
populateReadQueryInternal(readQuery, innerContext);
return innerContext;
}
/**
* Add all of the relevant query settings from an EJBQLParseTree to the given
* database query.
* @param query The query to populate
* @param session The sessionto use to information such as descriptors.
*/
public void populateQuery(DatabaseQuery query, AbstractSession session) {
if (query.isObjectLevelReadQuery()) {
ObjectLevelReadQuery objectQuery = (ObjectLevelReadQuery)query;
GenerationContext generationContext = buildContext(objectQuery, session);
populateReadQueryInternal(objectQuery, generationContext);
} else if (query.isUpdateAllQuery()) {
UpdateAllQuery updateQuery = (UpdateAllQuery)query;
GenerationContext generationContext = buildContext(updateQuery, session);
populateModifyQueryInternal(updateQuery, generationContext);
addUpdatesToQuery(updateQuery, generationContext);
} else if (query.isDeleteAllQuery()) {
DeleteAllQuery deleteQuery = (DeleteAllQuery)query;
GenerationContext generationContext = buildContext(deleteQuery, session);
populateModifyQueryInternal(deleteQuery, generationContext);
}
}
private void populateReadQueryInternal(ObjectLevelReadQuery objectQuery,
GenerationContext generationContext) {
// Get the reference class if it does not exist. This is done
// for dynamic queries in EJBQL 3.0
if (objectQuery.getReferenceClass() == null) {
// Adjust the reference class if necessary
adjustReferenceClassForQuery(objectQuery, generationContext);
}
// Initialize the base expression in the generation context
initBaseExpression(objectQuery, generationContext);
// Validate parse tree
validate(generationContext.getSession(), getClassLoader());
// Apply the query node to the query (this will be a SelectNode for a read query)
applyQueryNodeToQuery(objectQuery, generationContext);
// Verify the SELECT is valid (valid alias, etc)
verifySelect(objectQuery, generationContext);
// This is what it's all about...
setSelectionCriteriaForQuery(objectQuery, generationContext);
// Add any ordering
addOrderingToQuery(objectQuery, generationContext);
// Add any grouping
addGroupingToQuery(objectQuery, generationContext);
// Add having
addHavingToQuery(objectQuery, generationContext);
// Add non fetch joined variables
addNonFetchJoinAttributes(objectQuery, generationContext);
}
private void populateModifyQueryInternal(ModifyAllQuery query,
GenerationContext generationContext) {
if (query.getReferenceClass() == null) {
// Adjust the reference class if necessary
adjustReferenceClassForQuery(query, generationContext);
}
query.setSession(generationContext.getSession());
// Initialize the base expression in the generation context
initBaseExpression(query, generationContext);
// Validate parse tree
validate(generationContext.getSession(), getClassLoader());
// Apply the query node to the query
applyQueryNodeToQuery(query, generationContext);
setSelectionCriteriaForQuery(query, generationContext);
}
}