Package org.pentaho.reporting.engine.classic.core.function

Class ColumnAggregationExpression

java.lang.Object

org.pentaho.reporting.engine.classic.core.function.AbstractExpression

org.pentaho.reporting.engine.classic.core.function.ColumnAggregationExpression

All Implemented Interfaces:

Serializable, Cloneable, Expression

Direct Known Subclasses:

AndExpression, ColumnAverageExpression, ColumnDifferenceExpression, ColumnDivisionExpression, ColumnMaximumExpression, ColumnMinimumExpression, ColumnMultiplyExpression, ColumnSumExpression, OrExpression, SingleValueQueryFunction

public abstract class ColumnAggregationExpression
extends AbstractExpression

The base-class for all expressions that aggregate values from multiple columns.

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ColumnAggregationExpression()	Default Constructor.

Method Summary

Modifier and Type	Method	Description
String[]	getField()	Returns all defined fields as array of strings.
String	getField(int index)	Returns the defined field at the given index-position.
int	getFieldCount()	Returns the number of fields defined in this expression.
protected Object[]	getFieldValues()	Collects the values of all fields defined in the fieldList.
Expression	getInstance()	Return a completly separated copy of this function.
void	setField(int index, String field)	Defines the field in the field-list at the given index.
void	setField(String[] fields)	Defines all fields as array.

Methods inherited from class org.pentaho.reporting.engine.classic.core.function.AbstractExpression

clone, getDataRow, getDependencyLevel, getName, getReportConfiguration, getResourceBundleFactory, getRuntime, isActive, isDeepTraversing, isPreserve, setActive, setDependencyLevel, setName, setPreserve, setRuntime

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.pentaho.reporting.engine.classic.core.function.Expression

getValue

Constructor Detail

ColumnAggregationExpression

protected ColumnAggregationExpression()

Default Constructor.

Method Detail

getFieldValues

protected Object[] getFieldValues()

Collects the values of all fields defined in the fieldList.

Returns:

an Object-array containing all defined values from the datarow

setField

public void setField(int index,
                     String field)

Defines the field in the field-list at the given index.

Parameters:

index - the position in the list, where the field should be defined.

field - the name of the field.

getField

public String getField(int index)

Returns the defined field at the given index-position.

Parameters:

index - the position of the field name that should be queried.

Returns:

the field name at the given position.

getFieldCount

public int getFieldCount()

Returns the number of fields defined in this expression.

Returns:

the number of fields.

getField

public String[] getField()

Returns all defined fields as array of strings.

Returns:

all the fields.

setField

public void setField(String[] fields)

Defines all fields as array. This completely replaces any previously defined fields.

Parameters:

fields - the new list of fields.

getInstance

public Expression getInstance()

Return a completly separated copy of this function. The copy does no longer share any changeable objects with the original function.

Specified by:

getInstance in interface Expression

Overrides:

getInstance in class AbstractExpression

Returns:

a copy of this function.