JDOIsEmpty (Ontopia)

java.lang.Object
- net.ontopia.persistence.query.jdo.JDOIsEmpty

All Implemented Interfaces:

JDOExpressionIF
```
public class JDOIsEmpty
extends Object
implements JDOExpressionIF
```
INTERNAL: JDOQL method: Collection.isEmpty(). Syntax: 'A.isEmpty()'.

Field Summary

Fields
Modifier and Type Field Description

protected JDOValueIF value
- Fields inherited from interface net.ontopia.persistence.query.jdo.JDOExpressionIF
  AND, BOOLEAN, CONTAINS, ENDS_WITH, EQUALS, IS_EMPTY, LIKE, NOT, NOT_EQUALS, OR, SET_OPERATION, STARTS_WITH, VALUE_EXPRESSION

Constructor Summary

Constructors
Constructor Description

JDOIsEmpty(JDOField value)

JDOIsEmpty(JDOValueIF value)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`
`int`	`getType()`	INTERNAL: Returns the type of JDO expression indicated by one of the constants in the `JDOExpressionIF` interface.
`JDOValueIF`	`getValue()`
`int`	`hashCode()`
`String`	`toString()`
`void`	`visit(JDOVisitorIF visitor)`	INTERNAL: Allows the value to be visited.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - value
```
protected JDOValueIF value
```
- Constructor Detail
  - JDOIsEmpty
```
public JDOIsEmpty(JDOField value)
```
  - JDOIsEmpty
```
public JDOIsEmpty(JDOValueIF value)
```
- Method Detail
  - getType
```
public int getType()
```
    Description copied from interface: JDOExpressionIF
    
    INTERNAL: Returns the type of JDO expression indicated by one of the constants in the JDOExpressionIF interface.
    
    Specified by:
    
    getType in interface JDOExpressionIF
  - getValue
```
public JDOValueIF getValue()
```
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - visit
```
public void visit(JDOVisitorIF visitor)
```
    Description copied from interface: JDOExpressionIF
    
    INTERNAL: Allows the value to be visited. This method is used for retrieval of nested data in expressions.
    
    Specified by:
    
    visit in interface JDOExpressionIF