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java.lang.Objectorg.apache.derby.iapi.types.DataType
org.apache.derby.iapi.types.NumberDataType
org.apache.derby.iapi.types.SQLReal
public final class SQLReal
SQLReal satisfies the DataValueDescriptor interfaces (i.e., OrderableDataType). It implements a real column, e.g. for storing a column value; it can be specified when constructed to not allow nulls. Nullability cannot be changed after construction, as it affects the storage size and mechanism.
Because OrderableDataType is a subtype of ValueColumn, SQLReal can play a role in either a ValueColumn/Row or a OrderableDataType/Row, interchangeably.
We assume the store has a flag for nullness of the value, and simply return a 0-length array for the stored form when the value is null.
PERFORMANCE: There are likely alot of performance improvements possible for this implementation -- it new's Float more than it probably wants to.
This is called SQLReal even though it maps to the Java float type, to avoid confusion with whether it maps to the SQL float type or not. It doesn't, it maps to the SQL real type.
This is modeled after SQLSmallint.
SQLSmallint
,
Serialized FormField Summary | |
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private static int |
BASE_MEMORY_USAGE
|
private boolean |
isnull
|
(package private) static int |
REAL_LENGTH
|
private float |
value
|
Fields inherited from class org.apache.derby.iapi.types.NumberDataType |
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MAXLONG_PLUS_ONE, MINLONG_MINUS_ONE, ZERO_DECIMAL |
Fields inherited from interface org.apache.derby.iapi.types.NumberDataValue |
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MAX_DECIMAL_PRECISION_SCALE, MIN_DECIMAL_DIVIDE_SCALE |
Fields inherited from interface org.apache.derby.iapi.types.DataValueDescriptor |
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UNKNOWN_LOGICAL_LENGTH |
Fields inherited from interface org.apache.derby.iapi.types.Orderable |
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ORDER_OP_EQUALS, ORDER_OP_GREATEROREQUALS, ORDER_OP_GREATERTHAN, ORDER_OP_LESSOREQUALS, ORDER_OP_LESSTHAN |
Constructor Summary | |
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SQLReal()
no-arg constructor, required by Formattable. |
|
SQLReal(float val)
|
|
SQLReal(java.lang.Float obj)
|
Method Summary | |
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DataValueDescriptor |
cloneValue(boolean forceMaterialization)
Clone this DataValueDescriptor. |
NumberDataValue |
divide(NumberDataValue dividend,
NumberDataValue divisor,
NumberDataValue result)
This method implements the / operator for "real / real". |
BooleanDataValue |
equals(DataValueDescriptor left,
DataValueDescriptor right)
The = operator as called from the language module, as opposed to the storage module. |
int |
estimateMemoryUsage()
Estimate the memory usage in bytes of the data value and the overhead of the class. |
boolean |
getBoolean()
Gets the value in the data value descriptor as a boolean. |
byte |
getByte()
Gets the value in the data value descriptor as a byte. |
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. |
int |
getInt()
Gets the value in the data value descriptor as a int. |
int |
getLength()
Gets the length of the data value. |
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.Object |
getObject()
Gets the value in the data value descriptor as a int. |
short |
getShort()
Gets the value in the data value descriptor as a short. |
java.lang.String |
getString()
Gets the value in the data value descriptor as a String. |
int |
getTypeFormatId()
Return my format identifier. |
java.lang.String |
getTypeName()
Get the SQL name of the datatype |
BooleanDataValue |
greaterOrEquals(DataValueDescriptor left,
DataValueDescriptor right)
The >= operator as called from the language module, as opposed to the storage module. |
BooleanDataValue |
greaterThan(DataValueDescriptor left,
DataValueDescriptor right)
The > operator as called from the language module, as opposed to the storage module. |
int |
hashCode()
|
protected boolean |
isNegative()
This method implements the isNegative method. |
boolean |
isNull()
Return whether the value is null or not. |
BooleanDataValue |
lessOrEquals(DataValueDescriptor left,
DataValueDescriptor right)
The <= operator as called from the language module, as opposed to the storage module. |
BooleanDataValue |
lessThan(DataValueDescriptor left,
DataValueDescriptor right)
The < operator as called from the language module, as opposed to the storage module. |
NumberDataValue |
minus(NumberDataValue result)
This method implements the unary minus operator for real. |
NumberDataValue |
minus(NumberDataValue left,
NumberDataValue right,
NumberDataValue result)
This method implements the - operator for "real - real". |
BooleanDataValue |
notEquals(DataValueDescriptor left,
DataValueDescriptor right)
The <> operator as called from the language module, as opposed to the storage module. |
NumberDataValue |
plus(NumberDataValue addend1,
NumberDataValue addend2,
NumberDataValue result)
This method implements the + operator for "real + real". |
void |
readExternal(java.io.ObjectInput in)
|
void |
readExternalFromArray(ArrayInputStream in)
Read the DataValueDescriptor from the stream. |
void |
restoreToNull()
Restore this object to its (SQL)null value. |
void |
setBigDecimal(java.lang.Number bigDecimal)
Called for an application setting this value using a BigDecimal |
protected void |
setFrom(DataValueDescriptor theValue)
Set the value of this DataValueDescriptor based on the value of the specified DataValueDescriptor. |
void |
setInto(java.sql.PreparedStatement ps,
int position)
Set the value into a PreparedStatement. |
void |
setInto(java.sql.ResultSet rs,
int position)
Set this value into a ResultSet for a subsequent ResultSet.insertRow or ResultSet.updateRow. |
(package private) void |
setObject(java.lang.Object theValue)
Set the value from a correctly typed Float object. |
void |
setValue(boolean theValue)
Set the value. |
void |
setValue(double theValue)
Set the value of this DataValueDescriptor to the given double value At DataType level just throws an error lower classes will override |
void |
setValue(float theValue)
Set the value of this DataValueDescriptor to the given float value At DataType level just throws an error lower classes will override |
void |
setValue(int theValue)
Set the value of this DataValueDescriptor to the given int value At DataType level just throws an error lower classes will override |
void |
setValue(long theValue)
Set the value of this DataValueDescriptor to the given long value At DataType level just throws an error lower classes will override |
void |
setValue(java.lang.Number theValue)
Common code to handle java.lang.Integer as a Number, used for TINYINT, SMALLINT, INTEGER |
void |
setValue(java.lang.String theValue)
Set the value of this DataValueDescriptor. |
void |
setValueFromResultSet(java.sql.ResultSet resultSet,
int colNumber,
boolean isNullable)
Set the value based on the value for the specified DataValueDescriptor from the specified ResultSet. |
NumberDataValue |
times(NumberDataValue left,
NumberDataValue right,
NumberDataValue result)
This method implements the * operator for "real * real". |
java.lang.String |
toString()
|
protected int |
typeCompare(DataValueDescriptor arg)
Compare this (not null) to a non-null value. |
int |
typePrecedence()
Each built-in type in JSQL has a precedence. |
int |
typeToBigDecimal()
DOUBLE implementation. |
void |
writeExternal(java.io.ObjectOutput out)
|
Methods inherited from class org.apache.derby.iapi.types.NumberDataType |
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absolute, compare, compare, divide, getDecimalValuePrecision, getDecimalValueScale, mod, normalizeDOUBLE, normalizeREAL, normalizeREAL, objectNull, setValue, setValue, sqrt |
Methods inherited from class org.apache.derby.iapi.types.DataType |
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checkHostVariable, cloneHolder, coalesce, compare, compare, compareTo, dataTypeConversion, equals, flip, genericSetObject, getBytes, getDate, getNationalString, getStream, getTime, getTimestamp, getTraceString, getTypeName, hasStream, in, invalidFormat, isNotNull, isNullOp, normalize, outOfRange, recycle, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, throwLangSetMismatch, throwLangSetMismatch |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.apache.derby.iapi.types.DataValueDescriptor |
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checkHostVariable, cloneHolder, coalesce, compare, compare, getBytes, getDate, getStream, getTime, getTimestamp, getTraceString, hasStream, in, isNotNull, isNullOp, normalize, recycle, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue |
Field Detail |
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static final int REAL_LENGTH
private static final int BASE_MEMORY_USAGE
private float value
private boolean isnull
Constructor Detail |
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public SQLReal()
public SQLReal(float val) throws StandardException
StandardException
public SQLReal(java.lang.Float obj) throws StandardException
StandardException
Method Detail |
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public int getInt() throws StandardException
DataType
getInt
in interface DataValueDescriptor
getInt
in class DataType
StandardException
- thrown on failure to convertDataValueDescriptor.getInt()
public byte getByte() throws StandardException
DataType
getByte
in interface DataValueDescriptor
getByte
in class DataType
StandardException
- thrown on failure to convertDataValueDescriptor.getByte()
public short getShort() throws StandardException
DataType
getShort
in interface DataValueDescriptor
getShort
in class DataType
StandardException
- thrown on failure to convertDataValueDescriptor.getShort()
public long getLong() throws StandardException
DataType
getLong
in interface DataValueDescriptor
getLong
in class DataType
StandardException
- thrown on failure to convertDataValueDescriptor.getLong()
public float getFloat()
DataType
getFloat
in interface DataValueDescriptor
getFloat
in class DataType
DataValueDescriptor.getFloat()
public double getDouble()
DataType
getDouble
in interface DataValueDescriptor
getDouble
in class DataType
DataValueDescriptor.getDouble()
public int typeToBigDecimal()
typeToBigDecimal
in interface DataValueDescriptor
typeToBigDecimal
in class NumberDataType
public boolean getBoolean()
DataType
getBoolean
in interface DataValueDescriptor
getBoolean
in class DataType
DataValueDescriptor.getBoolean()
public java.lang.String getString()
DataValueDescriptor
DataValueDescriptor.getString()
public int getLength()
DataValueDescriptor
DataValueDescriptor.getLength()
public java.lang.Object getObject()
DataType
getObject
in interface DataValueDescriptor
getObject
in class DataType
DataValueDescriptor.getObject()
public java.lang.String getTypeName()
DataValueDescriptor
public int getTypeFormatId()
TypedFormat.getTypeFormatId()
public boolean isNull()
Storable
Storable.isNull()
public void writeExternal(java.io.ObjectOutput out) throws java.io.IOException
java.io.IOException
public void readExternal(java.io.ObjectInput in) throws java.io.IOException
java.io.IOException
Externalizable.readExternal(java.io.ObjectInput)
public void readExternalFromArray(ArrayInputStream in) throws java.io.IOException
DataValueDescriptor
Initialize the data value by reading it's values from the ArrayInputStream. This interface is provided as a way to achieve possible performance enhancement when reading an array can be optimized over reading from a generic stream from readExternal().
in
- The array stream positioned at the beginning of the
byte stream to read from.
java.io.IOException
- Usual error is if you try to read
past limit on the stream.public void restoreToNull()
Storable
Storable.restoreToNull()
protected int typeCompare(DataValueDescriptor arg) throws StandardException
NumberDataType
typeCompare
in class NumberDataType
StandardException
- Thrown on errorpublic DataValueDescriptor cloneValue(boolean forceMaterialization)
DataValueDescriptor
Even though the objects can be modified independently regardless of the
value of forceMaterialization
, both the clone and the
original may be dependent on the store state if
forceMaterialization
is set to false
. An example is if
you need to access the value you just read using cloneValue
after the current transaction has ended, or after the source result set
has been closed.
forceMaterialization
- any streams representing the data value will
be materialized if true
, the data value will be kept as a
stream if possible if false
DataValueDescriptor
with the same initial
value as this.DataValueDescriptor.cloneValue(boolean)
public DataValueDescriptor getNewNull()
DataValueDescriptor
DataValueDescriptor.getNewNull()
public void setValueFromResultSet(java.sql.ResultSet resultSet, int colNumber, boolean isNullable) throws StandardException, java.sql.SQLException
DataValueDescriptor
resultSet
- The specified ResultSet.colNumber
- The 1-based column # into the resultSet.isNullable
- Whether or not the column is nullable
(No need to call wasNull() if not)
StandardException
- Thrown on error
java.sql.SQLException
- Thrown on errorDataValueDescriptor.setValueFromResultSet(java.sql.ResultSet, int, boolean)
public final void setInto(java.sql.PreparedStatement ps, int position) throws java.sql.SQLException
setInto
in interface DataValueDescriptor
setInto
in class DataType
java.sql.SQLException
- Error setting value in PreparedStatementpublic final void setInto(java.sql.ResultSet rs, int position) throws java.sql.SQLException, StandardException
setInto
in interface DataValueDescriptor
setInto
in class DataType
java.sql.SQLException
- thrown by the ResultSet object
StandardException
- thrown by me accessing my value.public void setValue(java.lang.String theValue) throws StandardException
DataType
setValue
in interface DataValueDescriptor
setValue
in class DataType
theValue
- The BigDecimal value to set this DataValueDescriptor to
StandardException
- thrown if string not acceptedpublic void setValue(java.lang.Number theValue) throws StandardException
NumberDataType
setValue
in interface NumberDataValue
setValue
in class NumberDataType
theValue
- An Number containing the value to set this
NumberDataValue to. Null means set the value
to SQL null.
StandardException
- Thrown on errorNumberDataValue.setValue(java.lang.Number)
public void setBigDecimal(java.lang.Number bigDecimal) throws StandardException
setBigDecimal
in interface DataValueDescriptor
setBigDecimal
in class NumberDataType
bigDecimal
- required to be a BigDecimal or null.
StandardException
public void setValue(float theValue) throws StandardException
DataType
setValue
in interface DataValueDescriptor
setValue
in class DataType
theValue
- The value to set this DataValueDescriptor to
StandardException
- Thrown on errorpublic void setValue(int theValue)
DataType
setValue
in interface DataValueDescriptor
setValue
in class DataType
theValue
- The value to set this DataValueDescriptor topublic void setValue(long theValue)
DataType
setValue
in interface DataValueDescriptor
setValue
in class DataType
theValue
- The value to set this DataValueDescriptor topublic void setValue(double theValue) throws StandardException
DataType
setValue
in interface DataValueDescriptor
setValue
in class DataType
theValue
- The value to set this DataValueDescriptor to
StandardException
- if outsideRangeForRealpublic void setValue(boolean theValue)
DataType
setValue
in interface DataValueDescriptor
setValue
in class DataType
theValue
- Contains the boolean value to set this toNumberDataValue.setValue(java.lang.Number)
void setObject(java.lang.Object theValue) throws StandardException
setObject
in class NumberDataType
StandardException
protected void setFrom(DataValueDescriptor theValue) throws StandardException
DataType
setFrom
in class DataType
theValue
- The DataValueDescriptor that holds the value to
which we want to set this DataValueDescriptor's value.
StandardException
public int typePrecedence()
DataType
typePrecedence
in interface DataValueDescriptor
typePrecedence
in class DataType
DataValueDescriptor.typePrecedence()
public BooleanDataValue equals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException
equals
in interface DataValueDescriptor
equals
in class DataType
left
- The value on the left side of the =right
- The value on the right side of the =
StandardException
- Thrown on errorpublic BooleanDataValue notEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException
notEquals
in interface DataValueDescriptor
notEquals
in class DataType
left
- The value on the left side of the <>right
- The value on the right side of the <>
StandardException
- Thrown on errorpublic BooleanDataValue lessThan(DataValueDescriptor left, DataValueDescriptor right) throws StandardException
lessThan
in interface DataValueDescriptor
lessThan
in class DataType
left
- The value on the left side of the <right
- The value on the right side of the <
StandardException
- Thrown on errorpublic BooleanDataValue greaterThan(DataValueDescriptor left, DataValueDescriptor right) throws StandardException
greaterThan
in interface DataValueDescriptor
greaterThan
in class DataType
left
- The value on the left side of the >right
- The value on the right side of the >
StandardException
- Thrown on errorpublic BooleanDataValue lessOrEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException
lessOrEquals
in interface DataValueDescriptor
lessOrEquals
in class DataType
left
- The value on the left side of the <=right
- The value on the right side of the <=
StandardException
- Thrown on errorpublic BooleanDataValue greaterOrEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException
greaterOrEquals
in interface DataValueDescriptor
greaterOrEquals
in class DataType
left
- The value on the left side of the >=right
- The value on the right side of the >=
StandardException
- Thrown on errorpublic NumberDataValue plus(NumberDataValue addend1, NumberDataValue addend2, NumberDataValue result) throws StandardException
plus
in interface NumberDataValue
plus
in class NumberDataType
addend1
- One of the addendsaddend2
- The other addendresult
- The result of a previous call to this method, null
if not called yet
StandardException
- Thrown on errorpublic NumberDataValue minus(NumberDataValue left, NumberDataValue right, NumberDataValue result) throws StandardException
minus
in interface NumberDataValue
minus
in class NumberDataType
left
- The value to be subtracted fromright
- The value to be subtractedresult
- The result of a previous call to this method, null
if not called yet
StandardException
- Thrown on errorpublic NumberDataValue times(NumberDataValue left, NumberDataValue right, NumberDataValue result) throws StandardException
left
- The first value to be multipliedright
- The second value to be multipliedresult
- The result of a previous call to this method, null
if not called yet
StandardException
- Thrown on errorpublic NumberDataValue divide(NumberDataValue dividend, NumberDataValue divisor, NumberDataValue result) throws StandardException
divide
in interface NumberDataValue
divide
in class NumberDataType
dividend
- The numeratordivisor
- The denominatorresult
- The result of a previous call to this method, null
if not called yet
StandardException
- Thrown on errorpublic NumberDataValue minus(NumberDataValue result) throws StandardException
result
- The result of a previous call to this method, null
if not called yet
StandardException
- Thrown on errorprotected boolean isNegative()
isNegative
in class NumberDataType
public java.lang.String toString()
toString
in class java.lang.Object
public int hashCode()
hashCode
in class java.lang.Object
public int estimateMemoryUsage()
DataValueDescriptor
|
Built on Thu 2010-12-23 20:49:13+0000, from revision ??? | ||||||||
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