Class LOBTypeCompiler
- java.lang.Object
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- org.apache.derby.impl.sql.compile.BaseTypeCompiler
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- org.apache.derby.impl.sql.compile.LOBTypeCompiler
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- All Implemented Interfaces:
TypeCompiler
public class LOBTypeCompiler extends BaseTypeCompiler
This class implements TypeCompiler for the SQL LOB types.
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Field Summary
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Fields inherited from interface org.apache.derby.iapi.sql.compile.TypeCompiler
AVG_OP, BOOLEAN_MAXWIDTH_AS_CHAR, DEFAULT_DECIMAL_PRECISION, DEFAULT_DECIMAL_SCALE, DIVIDE_OP, DOUBLE_MAXWIDTH_AS_CHAR, INT_MAXWIDTH_AS_CHAR, LONGINT_MAXWIDTH_AS_CHAR, MAX_DECIMAL_PRECISION_SCALE, MINUS_OP, MOD_OP, PLUS_OP, REAL_MAXWIDTH_AS_CHAR, SMALLINT_MAXWIDTH_AS_CHAR, SUM_OP, TIMES_OP, TINYINT_MAXWIDTH_AS_CHAR
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Constructor Summary
Constructors Constructor Description LOBTypeCompiler()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
compatible(TypeId otherType)
Tell whether this type (LOB) is compatible with the given type.boolean
convertible(TypeId otherType, boolean forDataTypeFunction)
Tell whether this type (LOB) can be converted to the given type.(package private) java.lang.String
dataValueMethodName()
Return the method name to get a Derby DataValueDescriptor object of the correct type and set it to a specific value.int
getCastToCharWidth(DataTypeDescriptor dts)
Return the maximum width for this data type when cast to a char type.java.lang.String
getCorrespondingPrimitiveTypeName()
Get the name of the corresponding Java type.java.lang.String
interfaceName()
Get the name of the interface for this type.(package private) java.lang.String
nullMethodName()
Return the method name to get a Derby DataValueDescriptor object of the correct type set to SQL NULL.boolean
storable(TypeId otherType, ClassFactory cf)
Tell whether this type (LOB) can be stored into from the given type.-
Methods inherited from class org.apache.derby.impl.sql.compile.BaseTypeCompiler
generateDataValue, generateNull, getPrimitiveMethodName, getStoredFormatIdFromTypeId, getTypeCompiler, getTypeId, numberConvertible, numberStorable, pushCollationForDataValue, resolveArithmeticOperation, setTypeId, userTypeStorable
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Method Detail
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convertible
public boolean convertible(TypeId otherType, boolean forDataTypeFunction)
Tell whether this type (LOB) can be converted to the given type.- Parameters:
otherType
- The CompilationType of the other type to compare this type toforDataTypeFunction
- true if this is a type function that requires more liberal behavior (e.g DOUBLE can convert a char but you cannot cast a CHAR to double.- Returns:
- true if the types can be converted, false if conversion is not allowed
- See Also:
TypeCompiler.convertible(org.apache.derby.iapi.types.TypeId, boolean)
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compatible
public boolean compatible(TypeId otherType)
Tell whether this type (LOB) is compatible with the given type.- Parameters:
otherType
- The TypeId of the other type.- Returns:
- true if the types are compatible, false if not compatible
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storable
public boolean storable(TypeId otherType, ClassFactory cf)
Tell whether this type (LOB) can be stored into from the given type.- Parameters:
otherType
- The TypeId of the other type.cf
- A ClassFactory- Returns:
- true if the other type can be stored in a column of this type.
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interfaceName
public java.lang.String interfaceName()
Description copied from interface:TypeCompiler
Get the name of the interface for this type. For example, the interface for a SQLInteger is NumberDataValue. The full path name of the type is returned.- Returns:
- The name of the interface for this type.
- See Also:
TypeCompiler.interfaceName()
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getCorrespondingPrimitiveTypeName
public java.lang.String getCorrespondingPrimitiveTypeName()
Description copied from interface:TypeCompiler
Get the name of the corresponding Java type. For numerics and booleans we will get the corresponding Java primitive type. e Each SQL type has a corresponding Java type. When a SQL value is passed to a Java method, it is translated to its corresponding Java type. For example, a SQL Integer will be mapped to a Java int, but a SQL date will be mapped to a java.sql.Date.- Returns:
- The name of the corresponding Java primitive type.
- See Also:
TypeCompiler.getCorrespondingPrimitiveTypeName()
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getCastToCharWidth
public int getCastToCharWidth(DataTypeDescriptor dts)
Description copied from interface:TypeCompiler
Return the maximum width for this data type when cast to a char type.- Parameters:
dts
- The associated DataTypeDescriptor for this TypeId.- Returns:
- int The maximum width for this data type when cast to a char type.
- See Also:
TypeCompiler.getCastToCharWidth(org.apache.derby.iapi.types.DataTypeDescriptor)
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nullMethodName
java.lang.String nullMethodName()
Description copied from class:BaseTypeCompiler
Return the method name to get a Derby DataValueDescriptor object of the correct type set to SQL NULL. The method named will be called with one argument: a holder object if pushCollationForDataValue() returns false, otherwise two arguments, the second being the collationType.- Specified by:
nullMethodName
in classBaseTypeCompiler
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dataValueMethodName
java.lang.String dataValueMethodName()
Description copied from class:BaseTypeCompiler
Return the method name to get a Derby DataValueDescriptor object of the correct type and set it to a specific value. The method named will be called with two arguments, a value to set the returned value to and a holder object if pushCollationForDataValue() returns false. Otherwise three arguments, the third being the collationType. This implementation returns "getDataValue" to map to the overloaded methods DataValueFactory.getDataValue(type, dvd type)- Overrides:
dataValueMethodName
in classBaseTypeCompiler
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