org.axiondb.types
Class DoubleType

java.lang.Object
  org.axiondb.types.BaseDataType
      org.axiondb.types.BaseNumberDataType
          org.axiondb.types.DoubleType

All Implemented Interfaces:

java.io.Serializable, java.util.Comparator, DataType, DataTypeFactory

public class DoubleType
extends BaseNumberDataType

A DataTyperepresenting a double value.

Version:

$Revision: 1.1 $ $Date: 2005/05/02 22:29:40 $

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.axiondb.DataType

DataType.BinaryRepresentation, DataType.ExactNumeric, DataType.NonFixedPrecision

Constructor Summary

DoubleType()

Method Summary

int	compare(java.lang.Object a, java.lang.Object b)
java.lang.Object	convert(java.lang.Object value) Returns a Double converted from the given value , or throws IllegalArgumentExceptionif the given value isn't acceptable.
int	getColumnDisplaySize() Value returned by ResultSetMetaData#getColumnDisplaySizefor this data type.
protected java.util.Comparator	getComparator() This base implementation simply returns a ComparableComparator.
int	getJdbcType() Returns the JDBC type codemost closely matching this type.
int	getPrecision() Value returned by ResultSetMetaData#getPrecisionfor this data type.
int	getPrecisionRadix() Indicates radix used to compute maximum number of significant digits for this datatype, as returned by DataType.getPrecision().
java.lang.String	getPreferredValueClassName() Returns the "normal" type returned by DataType.convert(java.lang.Object).
int	getScale() Value returned by ResultSetMetaData#getScalefor this data type.
DataType	makeNewInstance() Creates a new instance of this DataType implementation.
java.lang.Object	read(java.io.DataInput in) Instantiate an object of my type from the given DataInput.
java.lang.Object	successor(java.lang.Object value) Returns the successor for the given value.
boolean	supportsSuccessor() true
java.lang.String	toString() Returns "double"
void	write(java.lang.Object value, java.io.DataOutput out) Write an object of my type to the given DataOutput.

Methods inherited from class org.axiondb.types.BaseNumberDataType

accepts, toNumber

Methods inherited from class org.axiondb.types.BaseDataType

getLiteralPrefix, getLiteralSuffix, getNullableCode, getSearchableCode, isCaseSensitive, isCurrency, isUnsigned, toBigDecimal, toBigInteger, toBlob, toBoolean, toByte, toByteArray, toClob, toDate, toDouble, toFloat, toInt, toLong, toShort, toString, toTime, toTimestamp, toURL

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

DoubleType

public DoubleType()

Method Detail

getJdbcType

public int getJdbcType()

Description copied from interface: DataType

Returns the JDBC type codemost closely matching this type.

Specified by:

getJdbcType in interface DataType

Specified by:

getJdbcType in class BaseDataType

getPreferredValueClassName

public java.lang.String getPreferredValueClassName()

Description copied from interface: DataType

Returns the "normal" type returned by DataType.convert(java.lang.Object). Returns java.lang.Object if unknown.

Specified by:

getPreferredValueClassName in interface DataType

Overrides:

getPreferredValueClassName in class BaseDataType

See Also:

AxionResultSetMetaData.getColumnClassName(int)

getPrecision

public int getPrecision()

Description copied from interface: DataType

Value returned by ResultSetMetaData#getPrecisionfor this data type.

Specified by:

getPrecision in interface DataType

Overrides:

getPrecision in class BaseDataType

See Also:

ResultSetMetaData.getPrecision(int)

getPrecisionRadix

public int getPrecisionRadix()

Description copied from interface: DataType

Indicates radix used to compute maximum number of significant digits for this datatype, as returned by DataType.getPrecision().

Specified by:

getPrecisionRadix in interface DataType

Overrides:

getPrecisionRadix in class BaseDataType

Returns:

radix used to compute value of DataType.getPrecision(), typically 2 or 10.

getScale

public int getScale()

Description copied from interface: DataType

Value returned by ResultSetMetaData#getScalefor this data type.

Specified by:

getScale in interface DataType

Overrides:

getScale in class BaseDataType

See Also:

ResultSetMetaData.getScale(int)

getColumnDisplaySize

public int getColumnDisplaySize()

Description copied from interface: DataType

Value returned by ResultSetMetaData#getColumnDisplaySizefor this data type.

Specified by:

getColumnDisplaySize in interface DataType

Overrides:

getColumnDisplaySize in class BaseDataType

See Also:

ResultSetMetaData.getColumnDisplaySize(int)

toString

public java.lang.String toString()

Returns "double"

Overrides:

toString in class java.lang.Object

Returns:

"double"

convert

public java.lang.Object convert(java.lang.Object value)
                         throws AxionException

Returns a Double converted from the given value , or throws IllegalArgumentExceptionif the given value isn't acceptable.

Specified by:

convert in interface DataType

Overrides:

convert in class BaseNumberDataType

Throws:

AxionException

read

public java.lang.Object read(java.io.DataInput in)
                      throws java.io.IOException

Description copied from interface: DataType

Instantiate an object of my type from the given DataInput. The next sequence of bytes to be read from the DataInput will have been written by DataType.write(java.lang.Object, java.io.DataOutput).

Specified by:

read in interface DataType

Specified by:

read in class BaseDataType

Throws:

java.io.IOException

See Also:

write(java.lang.Object, java.io.DataOutput)

supportsSuccessor

public boolean supportsSuccessor()

true

Specified by:

supportsSuccessor in interface DataType

Overrides:

supportsSuccessor in class BaseNumberDataType

successor

public java.lang.Object successor(java.lang.Object value)
                           throws java.lang.IllegalArgumentException

Description copied from interface: DataType

Returns the successor for the given value. For example, the successor of the integer 1 is 2.

Specified by:

successor in interface DataType

Overrides:

successor in class BaseDataType

Throws:

java.lang.IllegalArgumentException

write

public void write(java.lang.Object value,
                  java.io.DataOutput out)
           throws java.io.IOException

Description copied from interface: DataType

Write an object of my type to the given DataOutput.

Specified by:

write in interface DataType

Specified by:

write in class BaseDataType

Parameters:

value - the value to write, which must be acceptableto this DataType

Throws:

java.io.IOException

makeNewInstance

public DataType makeNewInstance()

Description copied from interface: DataType

Creates a new instance of this DataType implementation.

Specified by:

makeNewInstance in interface DataType

Specified by:

makeNewInstance in interface DataTypeFactory

Specified by:

makeNewInstance in class BaseDataType

Returns:

new instance of this DataType implementation.

compare

public int compare(java.lang.Object a,
                   java.lang.Object b)

Specified by:

compare in interface java.util.Comparator

Overrides:

compare in class BaseDataType

getComparator

protected java.util.Comparator getComparator()

Description copied from class: BaseDataType

This base implementation simply returns a ComparableComparator.

Overrides:

getComparator in class BaseDataType