ContentAssistExtension (EclipseLink 2.7.15, API Reference)

```
public interface ContentAssistExtension
```
This extension can be used to provide additional support to JPQL content assist that is outside the scope of providing proposals related to JPA metadata. It adds support for providing suggestions related to class names, enum constants, table names, column names.
Provisional API: This interface is part of an interim API that is still under development and expected to change significantly before reaching stability. It is available at this early stage to solicit feedback from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken (repeatedly) as the API evolves.

Version:

2.5

See Also:

AbstractJPQLQueryHelper.buildContentAssistProposals(int, ContentAssistExtension)

Author:

Pascal Filion

Since:

2.5

Field Summary

Fields
Modifier and Type Field Description

static ContentAssistExtension NULL_HELPER
The null instance of ContentAssistExtension.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.Iterable<java.lang.String>`	`classNames(java.lang.String prefix, ContentAssistProposals.ClassType type)`	Returns the fully qualified class names filtered by the given prefix and type.
`java.lang.Iterable<java.lang.String>`	`columnNames(java.lang.String tableName, java.lang.String prefix)`	Returns the names of the given table's columns.
`java.lang.Iterable<java.lang.String>`	`tableNames(java.lang.String prefix)`	Returns the names of the database tables filtered by the given prefix.

- Field Detail
  - NULL_HELPER
```
static final ContentAssistExtension NULL_HELPER
```
    The null instance of ContentAssistExtension.
- Method Detail
  - classNames
```
java.lang.Iterable<java.lang.String> classNames(java.lang.String prefix,
                                                ContentAssistProposals.ClassType type)
```
    Returns the fully qualified class names filtered by the given prefix and type.
    
    Parameters:
    
    prefix - The prefix is used to filter, it can be an empty string but never null
    
    type - Determines how to filter the various types of classes
    
    Returns:
    
    The filtered fully qualified class names
  - columnNames
```
java.lang.Iterable<java.lang.String> columnNames(java.lang.String tableName,
                                                 java.lang.String prefix)
```
    Returns the names of the given table's columns.
    
    Parameters:
    
    tableName - The name of the table to retrieve the name of its columns, which is never null
    
    prefix -
    
    Returns:
    
    The column names
  - tableNames
```
java.lang.Iterable<java.lang.String> tableNames(java.lang.String prefix)
```
    Returns the names of the database tables filtered by the given prefix.
    
    Parameters:
    
    prefix - The prefix is used to filter, it can be an empty string but never null
    
    Returns:
    
    The filtered table names