org.axiondb.types
Class BooleanType

java.lang.Object
  org.axiondb.types.BaseDataType
      org.axiondb.types.BooleanType

All Implemented Interfaces:

Comparator, DataType, DataTypeFactory, Serializable

public class BooleanType

extends BaseDataType

A DataType representing a Boolean value.

Version:

$Revision: 1.11 $ $Date: 2004/08/19 02:18:48 $

See Also:

Serialized Form

Constructor Summary

BooleanType()

Method Summary

boolean	accepts(Object value) Returns true iff value is null, or a Boolean.
Object	convert(Object value) Returns a Boolean converted from the given value, or throws IllegalArgumentException if the given value isn't acceptable.
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.
String	getPreferredValueClassName() Returns the "normal" type returned by convert(java.lang.Object).
DataType	makeNewInstance()
Object	read(DataInput in) Instantiate an object of my type from the given DataInput.
boolean	toBoolean(Object value) Convert the given non- null value to a boolean, or throw a SQLException.
String	toString() Returns "boolean"
void	write(Object value, DataOutput out) Writes the given value to the given DataOutput.

Methods inherited from class org.axiondb.types.BaseDataType

compare, getColumnDisplaySize, getLiteralPrefix, getLiteralSuffix, getNullableCode, getScale, getSearchableCode, isCaseSensitive, isCurrency, isUnsigned, successor, supportsSuccessor, toBigDecimal, toBigInteger, toBlob, toByte, toByteArray, toClob, toDate, toDouble, toFloat, toInt, toLong, toNumber, 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

BooleanType

public BooleanType()

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

Returns:

Types.BIT

getPreferredValueClassName

public 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

getComparator

public Comparator getComparator()

Description copied from class: BaseDataType

This base implementation simply returns a ComparableComparator.

Overrides:

getComparator in class BaseDataType

toString

public String toString()

Returns "boolean"

Returns:

"boolean"

toBoolean

public boolean toBoolean(Object value)
                  throws AxionException

Description copied from interface: DataType

Convert the given non- null value to a boolean, or throw a SQLException.

Specified by:

toBoolean in interface DataType

Overrides:

toBoolean in class BaseDataType

Throws:

AxionException

accepts

public boolean accepts(Object value)

Returns true iff value is null, or a Boolean.

Specified by:

accepts in interface DataType

Specified by:

accepts in class BaseDataType

convert

public Object convert(Object value)
               throws IllegalArgumentException

Returns a Boolean converted from the given value, or throws IllegalArgumentException if the given value isn't acceptable.

Specified by:

convert in interface DataType

Specified by:

convert in class BaseDataType

Throws:

IllegalArgumentException

read

public Object read(DataInput in)
            throws 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:

IOException

See Also:

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

write

public void write(Object value,
                  DataOutput out)
           throws IOException

Writes the given value to the given DataOutput. Null values are written as (byte)-1, false values are written as (byte)0, true values are written as (byte)1.

Specified by:

write in interface DataType

Specified by:

write in class BaseDataType

Parameters:

value - the value to write, which must be acceptable

Throws:

IOException

makeNewInstance

public DataType makeNewInstance()

Specified by:

makeNewInstance in interface DataTypeFactory

Specified by:

makeNewInstance in class BaseDataType