CollectionExpression (JDO API 3.2.1-SNAPSHOT API)

Type Parameters:

T - Java type being represented here

E - Element type of the collection being represented here

All Superinterfaces:

Expression<T>

All Known Subinterfaces:

ListExpression<T,E>
```
public interface CollectionExpression<T extends Collection<E>,E>
extends Expression<T>
```
Representation of a collection in a query.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`BooleanExpression`	`contains(E elem)`	Method returning whether the specified element is contained in this collection.
`BooleanExpression`	`contains(Expression<E> expr)`	Method returning whether the specified element expression is contained in this collection.
`BooleanExpression`	`isEmpty()`	Method returning whether the collection is empty.
`NumericExpression<Integer>`	`size()`	Method returning an expression for the size of the collection

Methods inherited from interface javax.jdo.query.Expression
as, cast, count, countDistinct, eq, eq, instanceOf, ne, ne

- Method Detail
  - contains
```
BooleanExpression contains(Expression<E> expr)
```
    Method returning whether the specified element expression is contained in this collection.
    
    Parameters:
    
    expr - The element expression
    
    Returns:
    
    Whether it is contained here
  - contains
```
BooleanExpression contains(E elem)
```
    Method returning whether the specified element is contained in this collection.
    
    Parameters:
    
    elem - The element
    
    Returns:
    
    Whether it is contained here
  - isEmpty
```
BooleanExpression isEmpty()
```
    Method returning whether the collection is empty.
    
    Returns:
    
    Whether it is empty
  - size
```
NumericExpression<Integer> size()
```
    Method returning an expression for the size of the collection
    
    Returns:
    
    The size