Java Doc for PercentageExpression.java in » Report » pentaho-report » org » jfree » report » function » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Report » pentaho report » org.jfree.report.function

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.jfree.report.function .AbstractExpression

org.jfree.report.function .PercentageExpression

All known Subclasses:   org.jfree.report.function .ItemColumnQuotientExpression,
PercentageExpression
public class PercentageExpression extends AbstractExpression (Code)
Computes the percentage for a column in relation to a base column.
The function undestands two parameters. The dividend parameter is required and denotes the name of an ItemBand-field which is used as dividend. The divisor parameter is required and denotes the name of an ItemBand-field which is uses as divisor.
If either the divident or the divisor are not numeric, the expression will return null.
The formula used is as follows:
Percent := divident / divisor

If the flag useDifference is set, the difference between base and subject is used instead.
Percent := (divisor - divident) / divisor

author:
   Heiko Evermann
author:
   Thomas Morgner

Constructor Summary
public PercentageExpression()
     Constructs a new function.

Method Summary
public String getDividend()
     Returns the field used as dividend by the function.
public String getDivisor()
     Returns the field used as divisor by the function.
public int getRoundingMode()
     Returns the defined rounding mode.
public int getScale()
     Returns the scale for the divide-operation.
public Object getValue()
     Return the current function value.
public boolean isUseDifference()
     Returns whether the difference between divident and divisor should be used as real divisor.
public void setDividend(String dividend)
     Sets the field name to be used as dividend for the function.
public void setDivisor(String divisor)
     Sets the field name to be used as divisor for the function.
public void setRoundingMode(int roundingMode)
     Defines the rounding mode.
public void setScale(int scale)
     Defines the scale for the divide-operation.
public void setUseDifference(boolean useDifference)
     Defines whether the difference between divident and divisor should be used as real divisor.

Constructor Detail
PercentageExpression
public PercentageExpression()(Code)
Constructs a new function.
Initially the function has no name...be sure to assign one before using the function.

Method Detail
getDividend
public String getDividend()(Code)
Returns the field used as dividend by the function.
The field name corresponds to a column name in the report's data-row. The field name.

getDivisor
public String getDivisor()(Code)
Returns the field used as divisor by the function.
The field name corresponds to a column name in the report's data-row. The field name.

getRoundingMode
public int getRoundingMode()(Code)
Returns the defined rounding mode. This influences the precision of the divide-operation. the rounding mode.
See Also:   java.math.BigDecimal.divide(java.math.BigDecimalint)

getScale
public int getScale()(Code)
Returns the scale for the divide-operation. The scale influences the precision of the division. the scale.

getValue
public Object getValue()(Code)
Return the current function value.
The value is calculated as the quotient of two columns: the dividend column and the divisor column. If the divisor is zero, the return value is "n/a"; The quotient

isUseDifference
public boolean isUseDifference()(Code)
Returns whether the difference between divident and divisor should be used as real divisor. true, if the difference is used, false if the divident is used directly.

setDividend
public void setDividend(String dividend)(Code)
Sets the field name to be used as dividend for the function.
The field name corresponds to a column name in the report's data-row.
Parameters:
  dividend - the field name.

setDivisor
public void setDivisor(String divisor)(Code)
Sets the field name to be used as divisor for the function.
The field name corresponds to a column name in the report's data-row.
Parameters:
  divisor - the field name.

setRoundingMode
public void setRoundingMode(int roundingMode)(Code)
Defines the rounding mode. This influences the precision of the divide-operation.
Parameters:
  roundingMode - the rounding mode.
See Also:   java.math.BigDecimal.divide(java.math.BigDecimalint)

setScale
public void setScale(int scale)(Code)
Defines the scale for the divide-operation. The scale influences the precision of the division.
Parameters:
  scale - the scale.

setUseDifference
public void setUseDifference(boolean useDifference)(Code)
Defines whether the difference between divident and divisor should be used as real divisor.
Parameters:
  useDifference - true, if the difference is used, false if the divident is used directly.

Methods inherited from org.jfree.report.function.AbstractExpression
public Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public DataRow getDataRow()(Code)(Java Doc)
public int getDependencyLevel()(Code)(Java Doc)
public Expression getInstance()(Code)(Java Doc)
public String getName()(Code)(Java Doc)
public Configuration getReportConfiguration()(Code)(Java Doc)
public ResourceBundleFactory getResourceBundleFactory()(Code)(Java Doc)
public ExpressionRuntime getRuntime()(Code)(Java Doc)
final public boolean isActive()(Code)(Java Doc)
public boolean isDeepTraversing()(Code)(Java Doc)
public boolean isPreserve()(Code)(Java Doc)
final public void setActive(boolean active)(Code)(Java Doc)
public void setDependencyLevel(int level)(Code)(Java Doc)
public void setName(String name)(Code)(Java Doc)
public void setPreserve(boolean preserve)(Code)(Java Doc)
public void setRuntime(ExpressionRuntime runtime)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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