org.apache.derby.iapi.types

Class SQLLongvarchar

java.lang.Object

org.apache.derby.iapi.types.DataType

org.apache.derby.iapi.types.SQLChar

org.apache.derby.iapi.types.SQLVarchar

org.apache.derby.iapi.types.SQLLongvarchar

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, java.lang.Comparable, Formatable, Storable, StreamStorable, TypedFormat, ConcatableDataValue, DataValueDescriptor, Orderable, StringDataValue, VariableSizeDataValue

Direct Known Subclasses:

CollatorSQLLongvarchar

public class SQLLongvarchar
extends SQLVarchar

SQLLongvarchar represents a LONG VARCHAR value with UCS_BASIC collation. SQLLongvarchar is mostly the same as SQLVarchar, so it is implemented as a subclass of SQLVarchar. Only those methods with different behavior are implemented here.

See Also:

Serialized Form

Field Summary

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

_clobValue, arg_passer, CHAR_HEADER_GENERATOR, RETURN_SPACE_THRESHOLD, stream

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

BOTH, COLLATION_DERIVATION_EXPLICIT, COLLATION_DERIVATION_IMPLICIT, COLLATION_DERIVATION_NONE, COLLATION_TYPE_TERRITORY_BASED, COLLATION_TYPE_TERRITORY_BASED_IDENTICAL, COLLATION_TYPE_TERRITORY_BASED_PRIMARY, COLLATION_TYPE_TERRITORY_BASED_SECONDARY, COLLATION_TYPE_TERRITORY_BASED_TERTIARY, COLLATION_TYPE_UCS_BASIC, LEADING, TRAILING

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

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

IGNORE_PRECISION

Constructor Summary

Constructors

Constructor and Description
SQLLongvarchar()
SQLLongvarchar(java.lang.String val)

Method Summary

Methods

Modifier and Type	Method and Description
DataValueDescriptor	cloneValue(boolean forceMaterialization) Clone this DataValueDescriptor.
StringDataValue	concatenate(StringDataValue leftOperand, StringDataValue rightOperand, StringDataValue result) The SQL concatenation '||' operator.
DataValueDescriptor	getNewNull() Get a new null value of the same type as this data value.
int	getTypeFormatId() Return my format identifier.
java.lang.String	getTypeName() Get the SQL name of the datatype
StringDataValue	getValue(java.text.RuleBasedCollator collatorForComparison) Gets either SQLChar/SQLVarchar/SQLLongvarchar/SQLClob(base classes) or CollatorSQLChar/CollatorSQLVarchar/CollatorSQLLongvarch/CollatorSQLClob (subclasses).
protected void	normalize(DataTypeDescriptor desiredType, java.lang.String sourceValue)
int	typePrecedence() Each built-in type in JSQL has a precedence.

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

growBy, normalize

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

ansiTrim, charLength, cloneHolder, compare, compare, copyState, equals, estimateMemoryUsage, getBoolean, getByte, getCharArray, getCollationKey, getCollatorForCollation, getDate, getDate, getDouble, getFloat, getInt, getLength, getLocaleFinder, getLong, getNewVarchar, getObject, getRawDataAndZeroIt, getShort, getStream, getStreamHeaderGenerator, getStreamWithDescriptor, getString, getTime, getTime, getTimestamp, getTimestamp, getTraceString, greaterOrEquals, greaterThan, hashCode, hashCodeForCollation, hasNonBlankChars, isNull, lessOrEquals, lessThan, like, like, loadStream, locate, lower, notEquals, readExternal, readExternal, readExternalClobFromArray, readExternalFromArray, restoreToNull, returnStream, setBigDecimal, setFrom, setInto, setLocaleFinder, setObjectForCast, setStream, setStreamHeaderFormat, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValueFromResultSet, setWidth, stringCompare, stringCompare, stringCompare, substring, throwStreamingIOException, toString, typeToBigDecimal, upper, writeClobUTF, writeExternal, zeroRawData

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

checkHostVariable, coalesce, compare, compare, compareTo, dataTypeConversion, equals, flip, genericSetObject, getBytes, getTypeName, hasStream, in, invalidFormat, isNotNull, isNullOp, outOfRange, recycle, setInto, setObject, setToNull, 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, coalesce, compare, compare, getBytes, hasStream, in, isNotNull, isNullOp, recycle, setInto, setToNull, setValue, setValue, setValue, setValue, setValue, setValue

Constructor Detail

SQLLongvarchar

public SQLLongvarchar()

SQLLongvarchar

public SQLLongvarchar(java.lang.String val)

Method Detail

getTypeName

public java.lang.String getTypeName()

Description copied from interface: DataValueDescriptor

Get the SQL name of the datatype

Specified by:

getTypeName in interface DataValueDescriptor

Overrides:

getTypeName in class SQLVarchar

Returns:

The SQL name of the datatype

cloneValue

public DataValueDescriptor cloneValue(boolean forceMaterialization)

Description copied from interface: DataValueDescriptor

Clone this DataValueDescriptor. Results in a new object that has the same value as this but can be modified independently.

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.

Specified by:

cloneValue in interface DataValueDescriptor

Overrides:

cloneValue in class SQLVarchar

Parameters:

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

Returns:

A clone of the DataValueDescriptor with the same initial value as this.

See Also:

DataValueDescriptor.cloneValue(boolean)

getNewNull

public DataValueDescriptor getNewNull()

Description copied from interface: DataValueDescriptor

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

Specified by:

getNewNull in interface DataValueDescriptor

Overrides:

getNewNull in class SQLVarchar

See Also:

DataValueDescriptor.getNewNull()

getValue

public StringDataValue getValue(java.text.RuleBasedCollator collatorForComparison)

Description copied from interface: StringDataValue

Gets either SQLChar/SQLVarchar/SQLLongvarchar/SQLClob(base classes) or CollatorSQLChar/CollatorSQLVarchar/CollatorSQLLongvarch/CollatorSQLClob (subclasses). Whether this method returns the base class or the subclass depends on the value of the RuleBasedCollator. If RuleBasedCollator is null, then the object returned would be baseclass otherwise it would be subcalss.

Specified by:

getValue in interface StringDataValue

Overrides:

getValue in class SQLVarchar

See Also:

StringDataValue.getValue(RuleBasedCollator)

getTypeFormatId

public int getTypeFormatId()

Return my format identifier.

Specified by:

getTypeFormatId in interface TypedFormat

Overrides:

getTypeFormatId in class SQLVarchar

Returns:

The identifier. (A UUID stuffed in an array of 16 bytes).

See Also:

TypedFormat.getTypeFormatId()

normalize

protected void normalize(DataTypeDescriptor desiredType,
             java.lang.String sourceValue)
                  throws StandardException

Overrides:

normalize in class SQLVarchar

Throws:

StandardException

concatenate

public StringDataValue concatenate(StringDataValue leftOperand,
                          StringDataValue rightOperand,
                          StringDataValue result)
                            throws StandardException

Description copied from interface: StringDataValue

The SQL concatenation '||' operator.

Specified by:

concatenate in interface StringDataValue

Overrides:

concatenate in class SQLChar

Parameters:

leftOperand - String on the left hand side of '||'

rightOperand - String on the right hand side of '||'

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

Returns:

A ConcatableDataValue containing the result of the '||'

Throws:

StandardException - Thrown on error

See Also:

StringDataValue.concatenate(org.apache.derby.iapi.types.StringDataValue, org.apache.derby.iapi.types.StringDataValue, org.apache.derby.iapi.types.StringDataValue)

typePrecedence

public int typePrecedence()

Description copied from class: DataType

Each built-in type in JSQL has a precedence. This precedence determines how to do type promotion when using binary operators. For example, float has a higher precedence than int, so when adding an int to a float, the result type is float. The precedence for some types is arbitrary. For example, it doesn't matter what the precedence of the boolean type is, since it can't be mixed with other types. But the precedence for the number types is critical. The SQL standard requires that exact numeric types be promoted to approximate numeric when one operator uses both. Also, the precedence is arranged so that one will not lose precision when promoting a type.

Specified by:

typePrecedence in interface DataValueDescriptor

Overrides:

typePrecedence in class SQLVarchar

Returns:

The precedence of this type.

See Also:

DataValueDescriptor.typePrecedence()