org.jsimpledb.parse.expr

Class ConstValue

java.lang.Object

org.jsimpledb.parse.expr.AbstractValue

org.jsimpledb.parse.expr.ConstValue

All Implemented Interfaces:

Value

public final class ConstValue
extends AbstractValue

A constant, read-only Value.

Field Summary

Fields inherited from interface org.jsimpledb.parse.expr.Value

EQ, GT, LT, NO_VALUE

Constructor Summary

Constructors

Constructor and Description
ConstValue(Object value) Constructor.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
Object	get(ParseSession session) Evaluate this value within the given context.
Class<?>	getType(ParseSession session) Get the type of this value without evaluating it.
int	hashCode()
String	toString()

Methods inherited from class org.jsimpledb.parse.expr.AbstractValue

add, and, asLValue, checkBoolean, checkIntegral, checkNotNull, checkNumeric, checkType, compare, divide, invert, lshift, mod, multiply, negate, or, rshift, subtract, urshift, xor, xxcrement

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ConstValue

public ConstValue(Object value)

Constructor.

Parameters:

value - constant result of evaluating this value

Method Detail

get

public Object get(ParseSession session)

Description copied from interface: Value

Evaluate this value within the given context.

Normally this method should only be invoked once, and the result cached, because evaluation could have side effects.

Parameters:

session - parse session

Returns:

the evaluated result

getType

public Class<?> getType(ParseSession session)

Description copied from interface: Value

Get the type of this value without evaluating it.

This should perform a best-effort attempt to determine the type, but should not invoke get(). If the type is unknown, Object.class should be returned.

Specified by:

getType in interface Value

Overrides:

getType in class AbstractValue

Parameters:

session - parse session

Returns:

the expected type of the evaluated result

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object