org.apache.lens.cube.metadata

Class ExprColumn

java.lang.Object

org.apache.lens.cube.metadata.CubeColumn

org.apache.lens.cube.metadata.ExprColumn

All Implemented Interfaces:

Named

public class ExprColumn
extends CubeColumn

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ExprColumn.ExprSpec

Field Summary

Fields

Modifier and Type	Field and Description
static char	EXPRESSION_DELIMITER
static char	EXPRESSION_SPEC_DELIMITER

Constructor Summary

Constructors

Constructor and Description
ExprColumn(org.apache.hadoop.hive.metastore.api.FieldSchema column, String displayString, ExprColumn.ExprSpec... expressions)
ExprColumn(org.apache.hadoop.hive.metastore.api.FieldSchema column, String displayString, String expression)
ExprColumn(String name, Map<String,String> props)

Method Summary

Methods

Modifier and Type	Method and Description
void	addExpression(ExprColumn.ExprSpec expression) Add an expression to existing set of expressions for this column
void	addProperties(Map<String,String> props)
boolean	equals(Object obj)
org.apache.hadoop.hive.ql.parse.ASTNode	getAst() Get the AST corresponding to the expression
String	getExpr() Returns the first expression.
List<org.apache.hadoop.hive.ql.parse.ASTNode>	getExpressionASTList()
Collection<String>	getExpressions() Get immutable view of this column's expression strings
Collection<ExprColumn.ExprSpec>	getExpressionSpecs() Get immutable view of this column's expression full spec
String	getType()
int	hashCode()
boolean	removeExpression(String expression) Remove an expression from the set of expressions of this column
String	toString()

Methods inherited from class org.apache.lens.cube.metadata.CubeColumn

getCost, getDescription, getDisplayString, getEndTime, getEndTimeMillisSinceEpoch, getName, getStartTime, getStartTimeMillisSinceEpoch, isColumnAvailableFrom, isColumnAvailableInTimeRange, isColumnAvailableTill

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

EXPRESSION_DELIMITER

public static final char EXPRESSION_DELIMITER

See Also:

Constant Field Values

EXPRESSION_SPEC_DELIMITER

public static final char EXPRESSION_SPEC_DELIMITER

See Also:

Constant Field Values

Constructor Detail

ExprColumn

public ExprColumn(org.apache.hadoop.hive.metastore.api.FieldSchema column,
          String displayString,
          String expression)
           throws LensException

Throws:

LensException

ExprColumn

public ExprColumn(org.apache.hadoop.hive.metastore.api.FieldSchema column,
          String displayString,
          ExprColumn.ExprSpec... expressions)
           throws LensException

Throws:

LensException

ExprColumn

public ExprColumn(String name,
          Map<String,String> props)

Method Detail

getExpr

public String getExpr()

Returns the first expression.

Returns:

the expression

getType

public String getType()

addProperties

public void addProperties(Map<String,String> props)

Overrides:

addProperties in class CubeColumn

hashCode

public int hashCode()

Overrides:

hashCode in class CubeColumn

equals

public boolean equals(Object obj)

Overrides:

equals in class CubeColumn

toString

public String toString()

Overrides:

toString in class CubeColumn

getAst

public org.apache.hadoop.hive.ql.parse.ASTNode getAst()
                                               throws LensException

Get the AST corresponding to the expression

Returns:

the ast

Throws:

LensException

getExpressionASTList

public List<org.apache.hadoop.hive.ql.parse.ASTNode> getExpressionASTList()
                                                                   throws LensException

Throws:

LensException

getExpressions

public Collection<String> getExpressions()

Get immutable view of this column's expression strings

Returns:

getExpressionSpecs

public Collection<ExprColumn.ExprSpec> getExpressionSpecs()

Get immutable view of this column's expression full spec

Returns:

addExpression

public void addExpression(ExprColumn.ExprSpec expression)
                   throws LensException

Add an expression to existing set of expressions for this column

Parameters:

expression -

Throws:

LensException

removeExpression

public boolean removeExpression(String expression)

Remove an expression from the set of expressions of this column

Parameters:

expression -

Returns: