fr.gael.drb.value
Interface Value

All Superinterfaces:

DrbItem

All Known Subinterfaces:

Numeric, NumericArray, ValueArray

All Known Implementing Classes:

AbstractNumericArray, AbstractValueArray, Binary, BinaryInteger, Boolean, BooleanArray, Byte, ByteArray, DateTime, DayTimeDuration, Decimal, DefaultValueArray, Double, DoubleArray, Duration, Float, FloatArray, Int, IntArray, Integer, Long, LongArray, Short, ShortArray, String, UnsignedByte, UnsignedByteArray, UnsignedInt, UnsignedIntArray, UnsignedLong, UnsignedLongArray, UnsignedShort, UnsignedShortArray, YearMonthDuration

public interface Value
extends DrbItem

Generic value wrapper for multiple purposes. This class allows easy evaluation of various kinds of expressions :

• Arithmetic Expressions
• Comparison Expressions
• Logical Expressions

There is no need to know the real type embedded in the value. If required an implicit conversion will be performed at run-time. It is also possible to perform an explicit conversion to any desired type. Each value has an unique type identifier (ID) associated with it. Two value of same type must also have the same ID. A range of ID defined below is reserved to identify primitive. The other ID can be freely used.

Field Summary

static int	ARRAY_ID Array value identifier.
static int	BINARY_ID Binary value identifier.
static int	BINARY_INTEGER_ID BinaryInteger value identifier.
static int	BOOLEAN_ID Boolean value identifier.
static int	BYTE_ID Byte value identifier.
static int	DATE_ID Date value identifier.
static int	DATE_TIME_ID Date/Time value identifier.
static int	DAY_ID Day value identifier.
static int	DAY_TIME_DURATION_ID Day/Time duration value identifier.
static int	DECIMAL_ID Decimal value identifier.
static int	DOUBLE_ID Double value identifier.
static int	DURATION_ID Duration value identifier.
static int	FLOAT_ID Float value identifier.
static int	INT_ID Int value identifier.
static int	INTEGER_ID Integer value identifier.
static int	LONG_ID Long value identifier.
static int	MONTH_DAY_ID Month/Day value identifier.
static int	MONTH_ID Month value identifier.
static int	NULL_ID NULL value identifier.
static int	NUMERIC_ID Numeric value identifier.
static int	OTHER_ID Other value identifier.
static int	SHORT_ID Short value identifier.
static int	STRING_ID String value identifier.
static int	TIME_ID Time value identifier.
static int	UNKNOWN_ID UNKNOWN value identifier.
static int	UNSIGNED_BYTE_ID UnsignedByte value identifier.
static int	UNSIGNED_INT_ID UnsignedInt value identifier.
static int	UNSIGNED_LONG_ID UnsignedLong value identifier.
static int	UNSIGNED_SHORT_ID UnsignedShort value identifier.
static int	YEAR_ID Year value identifier.
static int	YEAR_MONTH_DURATION_ID Year/Month duration value identifier.
static int	YEAR_MONTH_ID Year/Month value identifier.

Fields inherited from interface fr.gael.drb.DrbItem

ATTRIBUTE_ITEM, NODE_ITEM, UNDEFINED_ITEM, VALUE_ITEM

Method Summary

void	assign(Value v) Assign a new Value.
Value	convertTo(int type) Convert the value into the specified type.
int	getPriority() The absolute priority of the value.
int	getType() The type identifier of the value.

Methods inherited from interface fr.gael.drb.DrbItem

getItemType, getName, getNamespaceURI, getValue, rename, setNamespaceURI, setValue

Field Detail

UNKNOWN_ID

static final int UNKNOWN_ID

UNKNOWN value identifier.

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Constant Field Values

NULL_ID

static final int NULL_ID

NULL value identifier.

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BOOLEAN_ID

static final int BOOLEAN_ID

Boolean value identifier.

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BYTE_ID

static final int BYTE_ID

Byte value identifier.

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SHORT_ID

static final int SHORT_ID

Short value identifier.

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INT_ID

static final int INT_ID

Int value identifier.

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LONG_ID

static final int LONG_ID

Long value identifier.

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FLOAT_ID

static final int FLOAT_ID

Float value identifier.

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DOUBLE_ID

static final int DOUBLE_ID

Double value identifier.

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STRING_ID

static final int STRING_ID

String value identifier.

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DATE_ID

static final int DATE_ID

Date value identifier.

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NUMERIC_ID

static final int NUMERIC_ID

Numeric value identifier.

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ARRAY_ID

static final int ARRAY_ID

Array value identifier.

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BINARY_INTEGER_ID

static final int BINARY_INTEGER_ID

BinaryInteger value identifier.

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UNSIGNED_BYTE_ID

static final int UNSIGNED_BYTE_ID

UnsignedByte value identifier.

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UNSIGNED_SHORT_ID

static final int UNSIGNED_SHORT_ID

UnsignedShort value identifier.

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UNSIGNED_INT_ID

static final int UNSIGNED_INT_ID

UnsignedInt value identifier.

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UNSIGNED_LONG_ID

static final int UNSIGNED_LONG_ID

UnsignedLong value identifier.

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DURATION_ID

static final int DURATION_ID

Duration value identifier.

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DAY_TIME_DURATION_ID

static final int DAY_TIME_DURATION_ID

Day/Time duration value identifier.

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YEAR_MONTH_DURATION_ID

static final int YEAR_MONTH_DURATION_ID

Year/Month duration value identifier.

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YEAR_ID

static final int YEAR_ID

Year value identifier.

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YEAR_MONTH_ID

static final int YEAR_MONTH_ID

Year/Month value identifier.

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MONTH_ID

static final int MONTH_ID

Month value identifier.

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MONTH_DAY_ID

static final int MONTH_DAY_ID

Month/Day value identifier.

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DAY_ID

static final int DAY_ID

Day value identifier.

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DATE_TIME_ID

static final int DATE_TIME_ID

Date/Time value identifier.

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TIME_ID

static final int TIME_ID

Time value identifier.

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DECIMAL_ID

static final int DECIMAL_ID

Decimal value identifier.

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INTEGER_ID

static final int INTEGER_ID

Integer value identifier.

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BINARY_ID

static final int BINARY_ID

Binary value identifier.

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OTHER_ID

static final int OTHER_ID

Other value identifier.

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Method Detail

getType

int getType()

The type identifier of the value.

Returns:

an identifier of the value type.

convertTo

Value convertTo(int type)
                throws ClassCastException

Convert the value into the specified type. In case of identity conversion the value itself should be returned. If the conversion is not allowed a ClassCastException is thrown.

Parameters:

type - The target type.

Returns:

The converted value.

Throws:

ClassCastException - the exception

assign

void assign(Value v)

Assign a new Value. An implicit conversion may be performed to make the assignment. This assignment may result in a loss of precision (ex : float to int).

Parameters:

v - the value to be assigned.

getPriority

int getPriority()

The absolute priority of the value.

Returns:

The value priority.