org.h2.table

Class SingleColumnResolver

java.lang.Object

org.h2.table.SingleColumnResolver

All Implemented Interfaces:

ColumnResolver

public class SingleColumnResolver
extends java.lang.Object
implements ColumnResolver

The single column resolver is like a table with exactly one row. It is used to parse a simple one-column check constraint.

Method Summary

Methods

Modifier and Type	Method and Description
Column	findColumn(java.lang.String name) Get the column with the specified name.
java.lang.String	getColumnName(Column column) Get the name of the specified column.
Column[]	getColumns() Get the column list.
Column	getRowIdColumn() Get the row id pseudo column, if there is one.
java.lang.String	getSchemaName() Get the schema name or null.
Select	getSelect() Get the select statement.
Column[]	getSystemColumns() Get the list of system columns, if any.
java.lang.String	getTableAlias() Get the table alias.
TableFilter	getTableFilter() Get the table filter.
Value	getValue(Column col) Get the value for the given column.
boolean	hasDerivedColumnList() Returns whether this column resolver has a derived column list.
Expression	optimize(ExpressionColumn expressionColumn, Column col) Get the expression that represents this column.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getTableAlias

public java.lang.String getTableAlias()

Description copied from interface: ColumnResolver

Get the table alias.

Specified by:

getTableAlias in interface ColumnResolver

Returns:

the table alias

getValue

public Value getValue(Column col)

Description copied from interface: ColumnResolver

Get the value for the given column.

Specified by:

getValue in interface ColumnResolver

Parameters:

col - the column

Returns:

the value

getColumns

public Column[] getColumns()

Description copied from interface: ColumnResolver

Get the column list.

Specified by:

getColumns in interface ColumnResolver

Returns:

the column list

findColumn

public Column findColumn(java.lang.String name)

Description copied from interface: ColumnResolver

Get the column with the specified name.

Specified by:

findColumn in interface ColumnResolver

Parameters:

name - the column name, must be a derived name if this column resolver has a derived column list

Returns:

the column with the specified name, or null

getColumnName

public java.lang.String getColumnName(Column column)

Description copied from interface: ColumnResolver

Get the name of the specified column.

Specified by:

getColumnName in interface ColumnResolver

Parameters:

column - column

Returns:

column name

hasDerivedColumnList

public boolean hasDerivedColumnList()

Description copied from interface: ColumnResolver

Returns whether this column resolver has a derived column list.

Specified by:

hasDerivedColumnList in interface ColumnResolver

Returns:

true if this column resolver has a derived column list, false otherwise

getSchemaName

public java.lang.String getSchemaName()

Description copied from interface: ColumnResolver

Get the schema name or null.

Specified by:

getSchemaName in interface ColumnResolver

Returns:

the schema name or null

getTableFilter

public TableFilter getTableFilter()

Description copied from interface: ColumnResolver

Get the table filter.

Specified by:

getTableFilter in interface ColumnResolver

Returns:

the table filter

getSelect

public Select getSelect()

Description copied from interface: ColumnResolver

Get the select statement.

Specified by:

getSelect in interface ColumnResolver

Returns:

the select statement

getSystemColumns

public Column[] getSystemColumns()

Description copied from interface: ColumnResolver

Get the list of system columns, if any.

Specified by:

getSystemColumns in interface ColumnResolver

Returns:

the system columns or null

getRowIdColumn

public Column getRowIdColumn()

Description copied from interface: ColumnResolver

Get the row id pseudo column, if there is one.

Specified by:

getRowIdColumn in interface ColumnResolver

Returns:

the row id column or null

optimize

public Expression optimize(ExpressionColumn expressionColumn,
                  Column col)

Description copied from interface: ColumnResolver

Get the expression that represents this column.

Specified by:

optimize in interface ColumnResolver

Parameters:

expressionColumn - the expression column

col - the column

Returns:

the optimized expression