XPLAINFactory (Apache Derby V10.14 Internals)

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Summary:
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Constr |
Method

Detail:
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java.lang.Object
- org.apache.derby.impl.sql.execute.xplain.XPLAINFactory

All Implemented Interfaces:

XPLAINFactoryIF
```
public class XPLAINFactory
extends java.lang.Object
implements XPLAINFactoryIF
```
This is the module implementation of the XPLAINFactoryIF. It gets lazy-loaded when needed. The factory method determines which visitor to use. The visitor is cached in this factory for later reuse.

Field Summary

Fields
Modifier and Type Field Description

private java.lang.String currentSchema
the current cached schema

private XPLAINVisitor currentVisitor
the last instance of a visitor is cached
- Fields inherited from interface org.apache.derby.iapi.sql.execute.xplain.XPLAINFactoryIF
  MODULE

Constructor Summary

Constructors
Constructor Description

XPLAINFactory()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`freeResources()`	uncache the visitor and reset the factory state
`XPLAINVisitor`	`getXPLAINVisitor()`	the factory method, which gets called to determine and return an appropriate XPLAINVisitor instance

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

- Field Detail
  - currentVisitor
```
private XPLAINVisitor currentVisitor
```
    the last instance of a visitor is cached
  - currentSchema
```
private java.lang.String currentSchema
```
    the current cached schema
- Constructor Detail
  - XPLAINFactory
```
public XPLAINFactory()
```
- Method Detail
  - getXPLAINVisitor
```
public XPLAINVisitor getXPLAINVisitor()
                               throws StandardException
```
    the factory method, which gets called to determine and return an appropriate XPLAINVisitor instance
    
    Specified by:
    
    getXPLAINVisitor in interface XPLAINFactoryIF
    
    Returns:
    
    a XPLAINVisitor to traverse the ResultSetStatistics
    
    Throws:
    
    StandardException
    
    See Also:
    
    XPLAINVisitor
  - freeResources
```
public void freeResources()
```
    uncache the visitor and reset the factory state
    
    Specified by:
    
    freeResources in interface XPLAINFactoryIF

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Built on Wed 2018-05-16 16:01:03+0000, from revision ???

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Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.