EJBQLCompiledExpression (cayenne-doc: Cayenne Documentation 4.2 API)

```
public interface EJBQLCompiledExpression
```
Represents an EJB QL expression "compiled" in the context of a certain mapping.

Since:

3.0

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`ClassDescriptor`	`getEntityDescriptor(String identifier)`	Returns a ClassDescriptor for the id variable.
`EJBQLExpression`	`getExpression()`	Returns a tree representation of an EJBQL expression.
`List<DbRelationship>`	`getIncomingRelationships(String identifier)`	Returns a collection of relationships that joins identifier with a parent entity.
`PrefetchTreeNode`	`getPrefetchTree()`	Returns prefetched columns tree for fetch joins.
`SQLResult`	`getResult()`	Returns a mapping of the result set columns, or null if this is not a select expression.
`ClassDescriptor`	`getRootDescriptor()`	Returns a descriptor of the root of this expression such as entity being fetched or updated.
`String`	`getSource()`	Returns EJB QL source of the compiled expression if available.

- Method Detail
  - getExpression
```
EJBQLExpression getExpression()
```
    Returns a tree representation of an EJBQL expression.
  - getRootDescriptor
```
ClassDescriptor getRootDescriptor()
```
    Returns a descriptor of the root of this expression such as entity being fetched or updated.
  - getEntityDescriptor
```
ClassDescriptor getEntityDescriptor(String identifier)
```
    Returns a ClassDescriptor for the id variable.
  - getIncomingRelationships
```
List<DbRelationship> getIncomingRelationships(String identifier)
```
    Returns a collection of relationships that joins identifier with a parent entity. Returns null if the identifier corresponds to one of the query roots.
  - getSource
```
String getSource()
```
    Returns EJB QL source of the compiled expression if available.
  - getResult
```
SQLResult getResult()
```
    Returns a mapping of the result set columns, or null if this is not a select expression.
  - getPrefetchTree
```
PrefetchTreeNode getPrefetchTree()
```
    Returns prefetched columns tree for fetch joins.