org.openspaces.jpa.openjpa.query

Class AggregationFunction

java.lang.Object

org.openspaces.jpa.openjpa.query.AggregationFunction

All Implemented Interfaces:

Serializable, org.apache.openjpa.kernel.exps.Value, ExpressionNode

public class AggregationFunction
extends Object
implements org.apache.openjpa.kernel.exps.Value, ExpressionNode

An aggregation function representation. Supports the following aggregations: Sum, Minimum, Maximum, Count & Average.

Since:

8.0

Author:

idan

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AggregationFunction.AggregationType Aggregation function type

Nested classes/interfaces inherited from interface org.openspaces.jpa.openjpa.query.ExpressionNode

ExpressionNode.NodeType

Constructor Summary

Constructors

Constructor and Description
AggregationFunction(org.apache.openjpa.kernel.exps.Value path, AggregationFunction.AggregationType type)

Method Summary

Modifier and Type	Method and Description
void	acceptVisit(org.apache.openjpa.kernel.exps.ExpressionVisitor visitor) Accept a visit from a tree visitor.
void	appendSql(StringBuilder sql) Appends the node SQL string to the string builder.
AggregationFunction.AggregationType	getAggregationType()
String	getAlias() Return select item alias
org.apache.openjpa.meta.ClassMetaData	getMetaData() Return any associated persistent type.
String	getName()
ExpressionNode.NodeType	getNodeType() Gets the node type
org.apache.openjpa.kernel.exps.Path	getPath()
org.apache.openjpa.kernel.exps.Value	getSelectAs() Return 'this' concrete class if alias is set, otherwise null
Class	getType() Return the expected type for this value, or Object if the type is unknown.
boolean	isAggregate() Return true if this value is an aggregate.
boolean	isVariable() Return true if this value is a variable.
boolean	isXPath() Return true if this value is an XML Path.
void	setAlias(String alias) Set select item alias
void	setImplicitType(Class type) Set the implicit type of the value, based on how it is used in the filter.
void	setMetaData(org.apache.openjpa.meta.ClassMetaData meta) Associate a persistent type with this value.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregationFunction

public AggregationFunction(org.apache.openjpa.kernel.exps.Value path,
                           AggregationFunction.AggregationType type)

Method Detail

getType

public Class getType()

Return the expected type for this value, or Object if the type is unknown.

Specified by:

getType in interface org.apache.openjpa.kernel.exps.Value

setImplicitType

public void setImplicitType(Class type)

Set the implicit type of the value, based on how it is used in the filter. This method is only called on values who return Object from getType().

Specified by:

setImplicitType in interface org.apache.openjpa.kernel.exps.Value

isVariable

public boolean isVariable()

Return true if this value is a variable.

Specified by:

isVariable in interface org.apache.openjpa.kernel.exps.Value

isAggregate

public boolean isAggregate()

Return true if this value is an aggregate.

Specified by:

isAggregate in interface org.apache.openjpa.kernel.exps.Value

isXPath

public boolean isXPath()

Return true if this value is an XML Path.

Specified by:

isXPath in interface org.apache.openjpa.kernel.exps.Value

getMetaData

public org.apache.openjpa.meta.ClassMetaData getMetaData()

Return any associated persistent type.

Specified by:

getMetaData in interface org.apache.openjpa.kernel.exps.Value

setMetaData

public void setMetaData(org.apache.openjpa.meta.ClassMetaData meta)

Associate a persistent type with this value.

Specified by:

setMetaData in interface org.apache.openjpa.kernel.exps.Value

acceptVisit

public void acceptVisit(org.apache.openjpa.kernel.exps.ExpressionVisitor visitor)

Accept a visit from a tree visitor.

Specified by:

acceptVisit in interface org.apache.openjpa.kernel.exps.Value

getAlias

public String getAlias()

Return select item alias

Specified by:

getAlias in interface org.apache.openjpa.kernel.exps.Value

setAlias

public void setAlias(String alias)

Set select item alias

Specified by:

setAlias in interface org.apache.openjpa.kernel.exps.Value

getSelectAs

public org.apache.openjpa.kernel.exps.Value getSelectAs()

Return 'this' concrete class if alias is set, otherwise null

Specified by:

getSelectAs in interface org.apache.openjpa.kernel.exps.Value

getPath

public org.apache.openjpa.kernel.exps.Path getPath()

Specified by:

getPath in interface org.apache.openjpa.kernel.exps.Value

getName

public String getName()

Specified by:

getName in interface org.apache.openjpa.kernel.exps.Value

toString

public String toString()

Overrides:

toString in class Object

getAggregationType

public AggregationFunction.AggregationType getAggregationType()

appendSql

public void appendSql(StringBuilder sql)

Description copied from interface: ExpressionNode

Appends the node SQL string to the string builder.

Specified by:

appendSql in interface ExpressionNode

Parameters:

sql - The SQL string builder to append to.

getNodeType

public ExpressionNode.NodeType getNodeType()

Description copied from interface: ExpressionNode

Gets the node type

Specified by:

getNodeType in interface ExpressionNode

Returns:

The node type.