org.apache.derby.iapi.types
Class BigIntegerDecimal

java.lang.Object
  org.apache.derby.iapi.types.DataType
      org.apache.derby.iapi.types.NumberDataType
          org.apache.derby.iapi.types.BinaryDecimal
              org.apache.derby.iapi.types.BigIntegerDecimal

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, java.lang.Comparable, Formatable, Storable, TypedFormat, DataValueDescriptor, NumberDataValue, Orderable, VariableSizeDataValue

public final class BigIntegerDecimal
extends BinaryDecimal

DECIMAL support using the immutable java.math.BigInteger to perform arithmetic and conversions. Extends BinaryDecimal to use the base support of that class. J2ME/CDC/Foundation includes BigInteger. A BigInteger is used in calculations etc. to represent the integral unscaled value. It is simply created from new BigInteger(data2c). No additional instance fields are used by this class, a possible enhancement would be to keep the BigInteger around but would require calls from the parent class to reset state etc.

See Also:

Serialized Form

Field Summary

private static java.math.BigInteger	MAXLONG_PLUS_ONE
private static java.math.BigInteger	MINLONG_MINUS_ONE
private static java.math.BigInteger	TEN

Fields inherited from class org.apache.derby.iapi.types.BinaryDecimal

data2c, sqlScale

Fields inherited from class org.apache.derby.iapi.types.NumberDataType

ZERO_DECIMAL

Fields inherited from interface org.apache.derby.iapi.types.VariableSizeDataValue

IGNORE_PRECISION

Fields inherited from interface org.apache.derby.iapi.types.NumberDataValue

MAX_DECIMAL_PRECISION_SCALE, MIN_DECIMAL_DIVIDE_SCALE

Fields inherited from interface org.apache.derby.iapi.types.DataValueDescriptor

UNKNOWN_LOGICAL_LENGTH

Fields inherited from interface org.apache.derby.iapi.types.Orderable

ORDER_OP_EQUALS, ORDER_OP_GREATEROREQUALS, ORDER_OP_GREATERTHAN, ORDER_OP_LESSOREQUALS, ORDER_OP_LESSTHAN

Constructor Summary

BigIntegerDecimal()

Method Summary

NumberDataValue	divideNN(NumberDataValue left, NumberDataValue right, NumberDataValue result, int scale) Divide two non-null NumberDataValues using DECIMAL arithmetic.
private BigIntegerDecimal	getBID(DataValueDescriptor value) Obtain a BinaryDecimal that represents the passed in value.
boolean	getBoolean() Gets the value in the data value descriptor as a boolean.
int	getDecimalValuePrecision() Return the SQL precision of this value.
double	getDouble() Gets the value in the data value descriptor as a double.
float	getFloat() Gets the value in the data value descriptor as a float.
long	getLong() Gets the value in the data value descriptor as a long.
DataValueDescriptor	getNewNull() Get a new null value of the same type as this data value.
java.lang.String	getString() Gets the value in the data value descriptor as a String.
NumberDataValue	minus(NumberDataValue result) Negate the number.
void	normalize(DataTypeDescriptor desiredType, DataValueDescriptor source) Default normalization method.
NumberDataValue	plusNN(NumberDataValue left, NumberDataValue right, NumberDataValue result) Add two non-null NumberDataValues using DECIMAL arithmetic.
private static java.math.BigInteger	rescale(java.math.BigInteger bi, int deltaScale) Rescale a BigInteger, a positive delta means the scale is increased, zero no change and negative decrease of scale.
void	setValue(java.lang.String theValue) Set the value from a String, the format is nnnn Scale always set to zero.
void	setWidth(int desiredPrecision, int desiredScale, boolean errorOnTrunc)
NumberDataValue	timesNN(NumberDataValue left, NumberDataValue right, NumberDataValue result) Multiple two non-null NumberDataValues using DECIMAL arithmetic.
java.lang.String	toString()
protected int	typeCompare(DataValueDescriptor arg) Compare two non-null NumberDataValues using DECIMAL arithmetic.

Methods inherited from class org.apache.derby.iapi.types.BinaryDecimal

cloneValue, divide, divide, estimateMemoryUsage, getByte, getDecimalValueScale, getInt, getLength, getShort, getTypeFormatId, getTypeName, hashCode, isNegative, isNull, minus, minusNN, plus, readExternal, readExternalFromArray, restoreToNull, setFrom, setValue, setValue, setValue, setValue, setValue, setValue, setValueFromResultSet, times, typePrecedence, typeToBigDecimal, writeExternal

Methods inherited from class org.apache.derby.iapi.types.NumberDataType

absolute, compare, compare, mod, normalizeDOUBLE, normalizeREAL, normalizeREAL, objectNull, setBigDecimal, setObject, setValue, setValue, sqrt

Methods inherited from class org.apache.derby.iapi.types.DataType

checkHostVariable, cloneHolder, coalesce, compare, compare, compareTo, dataTypeConversion, equals, equals, flip, genericSetObject, getBytes, getDate, getNationalString, getObject, getStream, getTime, getTimestamp, getTraceString, getTypeName, greaterOrEquals, greaterThan, hasStream, in, invalidFormat, isNotNull, isNullOp, lessOrEquals, lessThan, notEquals, outOfRange, recycle, setInto, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, throwLangSetMismatch, throwLangSetMismatch

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.derby.iapi.types.DataValueDescriptor

checkHostVariable, cloneHolder, coalesce, compare, compare, equals, getBytes, getDate, getObject, getStream, getTime, getTimestamp, getTraceString, greaterOrEquals, greaterThan, hasStream, in, isNotNull, isNullOp, lessOrEquals, lessThan, notEquals, recycle, setInto, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue

Field Detail

TEN

private static final java.math.BigInteger TEN

MAXLONG_PLUS_ONE

private static final java.math.BigInteger MAXLONG_PLUS_ONE

MINLONG_MINUS_ONE

private static final java.math.BigInteger MINLONG_MINUS_ONE

Constructor Detail

BigIntegerDecimal

public BigIntegerDecimal()

Method Detail

getNewNull

public DataValueDescriptor getNewNull()

Description copied from interface: DataValueDescriptor

Get a new null value of the same type as this data value.

getLong

public long getLong()
             throws StandardException

Description copied from class: DataType

Gets the value in the data value descriptor as a long. Throws an exception if the data value is not receivable as a long.

Specified by:

getLong in interface DataValueDescriptor

Overrides:

getLong in class DataType

Returns:

The data value as a long.

Throws:

StandardException - Thrown on error

getFloat

public float getFloat()
               throws StandardException

Description copied from class: DataType

Gets the value in the data value descriptor as a float. Throws an exception if the data value is not receivable as a float.

Specified by:

getFloat in interface DataValueDescriptor

Overrides:

getFloat in class DataType

Returns:

The data value as a float.

Throws:

StandardException - Thrown on error

getDouble

public double getDouble()
                 throws StandardException

Description copied from class: DataType

Gets the value in the data value descriptor as a double. Throws an exception if the data value is not receivable as a double.

Specified by:

getDouble in interface DataValueDescriptor

Overrides:

getDouble in class DataType

Returns:

The data value as a double.

Throws:

StandardException - Thrown on error

getBoolean

public boolean getBoolean()

Description copied from class: DataType

Gets the value in the data value descriptor as a boolean. Throws an exception if the data value is not receivable as a boolean.

Specified by:

getBoolean in interface DataValueDescriptor

Overrides:

getBoolean in class DataType

Returns:

The data value as a boolean.

setValue

public void setValue(java.lang.String theValue)
              throws StandardException

Set the value from a String, the format is nnnn Scale always set to zero.

Specified by:

setValue in interface DataValueDescriptor

Overrides:

setValue in class DataType

Parameters:

theValue - The BigDecimal value to set this DataValueDescriptor to

Throws:

StandardException

getString

public java.lang.String getString()

Description copied from interface: DataValueDescriptor

Gets the value in the data value descriptor as a String. Throws an exception if the data value is not a string.

Returns:

The data value as a String.

getDecimalValuePrecision

public int getDecimalValuePrecision()

Return the SQL precision of this value.

Specified by:

getDecimalValuePrecision in interface NumberDataValue

Overrides:

getDecimalValuePrecision in class NumberDataType

typeCompare

protected int typeCompare(DataValueDescriptor arg)
                   throws StandardException

Compare two non-null NumberDataValues using DECIMAL arithmetic.

Specified by:

typeCompare in class NumberDataType

Throws:

StandardException - Thrown on error

plusNN

public NumberDataValue plusNN(NumberDataValue left,
                              NumberDataValue right,
                              NumberDataValue result)
                       throws StandardException

Add two non-null NumberDataValues using DECIMAL arithmetic. Uses add() to perform the calculation.

Specified by:

plusNN in class BinaryDecimal

Throws:

StandardException

minus

public NumberDataValue minus(NumberDataValue result)
                      throws StandardException

Negate the number.

Parameters:

result - The result of the previous call to this method, null if not called yet.

Returns:

- operand

Throws:

StandardException - Thrown on error, if result is non-null then its value will be unchanged.

See Also:

NumberDataValue.minus(org.apache.derby.iapi.types.NumberDataValue)

timesNN

public NumberDataValue timesNN(NumberDataValue left,
                               NumberDataValue right,
                               NumberDataValue result)
                        throws StandardException

Multiple two non-null NumberDataValues using DECIMAL arithmetic. Uses BigInteger.multipy() to perform the calculation. Simply multiply the unscaled values and add the scales, proof: left * right = (left_unscaled * 10^-left_scale) * (right_unscaled * 10^-right_scale) = (left_unscaled * 10^-left_scale) * (right_unscaled * 10^-right_scale) = (left_unscaled * right_unscaled) * 10^-(left_scale + right_scale)

Specified by:

timesNN in class BinaryDecimal

Throws:

StandardException

divideNN

public NumberDataValue divideNN(NumberDataValue left,
                                NumberDataValue right,
                                NumberDataValue result,
                                int scale)
                         throws StandardException

Divide two non-null NumberDataValues using DECIMAL arithmetic. Uses divide() to perform the calculation. Simply multiply the unscaled values and subtract the scales, proof: left / right = (left_unscaled * 10^-left_scale) / (right_unscaled * 10^-right_scale) = (left_unscaled / right_unscaled) * (10^-left_scale / 10^-right_scale) = (left_unscaled / right_unscaled) * (10^-(left_scale-right_scale))

Specified by:

divideNN in class BinaryDecimal

Throws:

StandardException

normalize

public void normalize(DataTypeDescriptor desiredType,
                      DataValueDescriptor source)
               throws StandardException

Description copied from class: DataType

Default normalization method. No information needed from DataTypeDescriptor.

Specified by:

normalize in interface DataValueDescriptor

Overrides:

normalize in class DataType

Parameters:

desiredType - The type to normalize the source column to

source - The value to normalize

Throws:

StandardException - Thrown normalization error.

setWidth

public void setWidth(int desiredPrecision,
                     int desiredScale,
                     boolean errorOnTrunc)
              throws StandardException

Throws:

StandardException

getBID

private BigIntegerDecimal getBID(DataValueDescriptor value)
                          throws StandardException

Obtain a BinaryDecimal that represents the passed in value.

Throws:

StandardException

rescale

private static java.math.BigInteger rescale(java.math.BigInteger bi,
                                            int deltaScale)

Rescale a BigInteger, a positive delta means the scale is increased, zero no change and negative decrease of scale. It is up to the caller to manage the actual scale of the value, e.g. don't allow the scale to go negative.

Parameters:

bi - value to be rescaled

deltaScale - change of scale

Returns:

rescaled value

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object