com.google.visualization.datasource.query
Class SimpleColumn

java.lang.Object
  com.google.visualization.datasource.query.AbstractColumn
      com.google.visualization.datasource.query.SimpleColumn

public class SimpleColumn
extends AbstractColumn

A column referred to by an explicit string ID.

Author:

Yonatan B.Y.

Constructor Summary

SimpleColumn(String columnId)
Creates a new instance of this class, with the given column ID.

Method Summary

boolean	equals(Object o)
List<AggregationColumn>	getAllAggregationColumns() Returns a list of all aggregation columns.
List<ScalarFunctionColumn>	getAllScalarFunctionColumns() Returns a list of all scalar function columns.
List<String>	getAllSimpleColumnIds() Returns a list of all simple (primitive) column IDs included in this AbstractColumn.
List<SimpleColumn>	getAllSimpleColumns() Returns a list of all simple columns.
String	getColumnId() Returns the column ID.
String	getId() Returns a string ID for this column.
ValueType	getValueType(DataTable dataTable) Returns the value type of the column.
int	hashCode()
String	toQueryString() Returns a string that when parsed by the query parser, should return an identical column.
String	toString()
void	validateColumn(DataTable dataTable) Checks if the column is valid.

Methods inherited from class com.google.visualization.datasource.query.AbstractColumn

getCell, getValue

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SimpleColumn

public SimpleColumn(String columnId)

Creates a new instance of this class, with the given column ID.

Parameters:

columnId - The column ID.

Method Detail

getColumnId

public String getColumnId()

Returns the column ID.

Returns:

The column ID.

getId

public String getId()

Description copied from class: AbstractColumn

Returns a string ID for this column. It can be already existing in the instance, or generated upon request, depending on the specific class implementation.

Specified by:

getId in class AbstractColumn

Returns:

The string ID for this column.

getAllSimpleColumnIds

public List<String> getAllSimpleColumnIds()

Description copied from class: AbstractColumn

Returns a list of all simple (primitive) column IDs included in this AbstractColumn. This is a list to support calculated columns in the future. For example, a simple column would just return a list containing its own ID. An aggregation column would just return a list containing the ID of its aggregated column. In future, when calculated columns are introduced, a calculated column will return a list with more than one element.

Specified by:

getAllSimpleColumnIds in class AbstractColumn

Returns:

A list of all simple column IDs included in this AbstractColumn.

equals

public boolean equals(Object o)

Specified by:

equals in class AbstractColumn

hashCode

public int hashCode()

Specified by:

hashCode in class AbstractColumn

toString

public String toString()

Overrides:

toString in class Object

getAllSimpleColumns

public List<SimpleColumn> getAllSimpleColumns()

Returns a list of all simple columns. In this case, returns only itself.

Specified by:

getAllSimpleColumns in class AbstractColumn

Returns:

A list of all simple columns.

getAllAggregationColumns

public List<AggregationColumn> getAllAggregationColumns()

Returns a list of all aggregation columns. In this case, returns an empty list.

Specified by:

getAllAggregationColumns in class AbstractColumn

Returns:

A list of all aggregation columns.

getAllScalarFunctionColumns

public List<ScalarFunctionColumn> getAllScalarFunctionColumns()

Returns a list of all scalar function columns. In this case, returns an empty list.

Specified by:

getAllScalarFunctionColumns in class AbstractColumn

Returns:

A list of all scalar function columns.

validateColumn

public void validateColumn(DataTable dataTable)

Checks if the column is valid. In this case always does nothing.

Specified by:

validateColumn in class AbstractColumn

Parameters:

dataTable - The data table.

getValueType

public ValueType getValueType(DataTable dataTable)

Returns the value type of the column. In this case returns the value type of the column itself.

Specified by:

getValueType in class AbstractColumn

Parameters:

dataTable - The data table.

Returns:

the value type of the column.

toQueryString

public String toQueryString()

Description copied from class: AbstractColumn

Returns a string that when parsed by the query parser, should return an identical column.

Specified by:

toQueryString in class AbstractColumn

Returns:

A string form of this column.