java.lang.Object
- org.datanucleus.store.rdbms.key.ColumnOrderedKey

Direct Known Subclasses:

CandidateKey, Index
```
public abstract class ColumnOrderedKey
extends Object
```
Representation of a key that has columns with specified ordering (ascending/descending) for each column (if required).

Field Summary

Fields
Modifier and Type	Field	Description
`protected List<Boolean>`	`columnOrdering`	Column ordering.
`protected List<Column>`	`columns`	Columns that the key relates to.
`protected Map<String,String>`	`extensions`
`protected String`	`name`	Name of the key.
`protected Table`	`table`	Table that the key applies to.

Constructor Summary

Constructors
Constructor Description

ColumnOrderedKey(Table table, Map<String,String> extensions)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addColumn(Column col)`	Class to add a column to the key
`protected void`	`assertSameDatastoreObject(Column col)`	Utility to assert if the column is for a different table.
`boolean`	`equals(Object obj)`	Equality operator.
`String`	`getColumnList()`	Accessor for the column list
`String`	`getColumnList(boolean includeOrdering)`	Method to return the list of columns which the key applies to.
`static String`	`getColumnList(List<Column> cols)`	Method to return the list of columns which the key applies to.
`List<Column>`	`getColumns()`	Accessor for the columns that the key relates to.
`String`	`getName()`	Accessor for the key name.
`Table`	`getTable()`	Accessor for the table
`String`	`getValueForExtension(String key)`
`int`	`hashCode()`	Hashcode operator.
`void`	`setColumn(int seq, Column col)`	Sets a column in a specified position `seq` for this index.
`void`	`setColumnOrdering(String ordering)`
`protected static void`	`setMinSize(List list, int size)`
`void`	`setName(String name)`	Mutator for the key name.

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

- Field Detail
  - columnOrdering
```
protected List<Boolean> columnOrdering
```
    Column ordering. True implies ascending order.
  - extensions
```
protected Map<String,String> extensions
```
  - name
```
protected String name
```
    Name of the key.
  - table
```
protected Table table
```
    Table that the key applies to.
  - columns
```
protected List<Column> columns
```
    Columns that the key relates to.
- Constructor Detail
  - ColumnOrderedKey
```
public ColumnOrderedKey(Table table,
                        Map<String,String> extensions)
```
- Method Detail
  - getValueForExtension
```
public String getValueForExtension(String key)
```
  - addColumn
```
public void addColumn(Column col)
```
    Class to add a column to the key
    
    Parameters:
    
    col - The column to add
  - setColumnOrdering
```
public void setColumnOrdering(String ordering)
```
  - setColumn
```
public void setColumn(int seq,
                      Column col)
```
    Sets a column in a specified position seq for this index.
    
    Parameters:
    
    seq - the specified position for the col
    
    col - the Column
  - getColumnList
```
public String getColumnList(boolean includeOrdering)
```
    Method to return the list of columns which the key applies to.
    
    Parameters:
    
    includeOrdering - Whether to include ordering in the column list when it is specified
    
    Returns:
    
    The column list.
  - setName
```
public void setName(String name)
```
    Mutator for the key name.
    
    Parameters:
    
    name - The key name
  - getName
```
public String getName()
```
    Accessor for the key name.
    
    Returns:
    
    Key name
  - getTable
```
public Table getTable()
```
    Accessor for the table
    
    Returns:
    
    table
  - getColumns
```
public List<Column> getColumns()
```
    Accessor for the columns that the key relates to.
    
    Returns:
    
    the List of columns.
  - getColumnList
```
public String getColumnList()
```
    Accessor for the column list
    
    Returns:
    
    The column list
  - assertSameDatastoreObject
```
protected void assertSameDatastoreObject(Column col)
```
    Utility to assert if the column is for a different table.
    
    Parameters:
    
    col - The column to compare with
  - hashCode
```
public int hashCode()
```
    Hashcode operator.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    The hashcode
  - equals
```
public boolean equals(Object obj)
```
    Equality operator.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    obj - Object to compare against
    
    Returns:
    
    Whether they are equal.
  - setMinSize
```
protected static void setMinSize(List list,
                                 int size)
```
  - getColumnList
```
public static String getColumnList(List<Column> cols)
```
    Method to return the list of columns which the key applies to.
    
    Parameters:
    
    cols - The columns.
    
    Returns:
    
    The column list.

Class ColumnOrderedKey

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

columnOrdering

extensions

name

table

columns

Constructor Detail

ColumnOrderedKey

Method Detail

getValueForExtension

addColumn

setColumnOrdering

setColumn

getColumnList

setName

getName

getTable

getColumns

getColumnList

assertSameDatastoreObject

hashCode

equals

setMinSize

getColumnList