uk.ac.man.cs.rainbow.rapa.data
Class Constant

java.lang.Object
  |
  +--uk.ac.man.cs.rainbow.rapa.data.Expression
        |
        +--uk.ac.man.cs.rainbow.rapa.data.Constant

All Implemented Interfaces:

Argument, Serializable, Value, VariableContainer

public class Constant

extends Expression

See Also:

Serialized Form

Constructor Summary

Constant(String name, Type type)

Method Summary

Value	apply(Unifier u) Apply a unifier to this value to get a new value.
boolean	equals(Value e)
String	getName()
Type	getResultType()
boolean	hasVariable()
boolean	occurs(Substitution s, Variable v) Check whether the variable occurs in this value under the given substitution.
Value	subst(Substitution s) Apply a substitution to this value to get a new value.
String	toString()
Substitution	unify(Substitution s, Value e) Get the substitution which unifies this value with the given value, after applying the given substitution.

Methods inherited from class uk.ac.man.cs.rainbow.rapa.data.Expression

compatableWith, equals, evaluate, getNodeType, subst

Methods inherited from class java.lang.Object

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

Constructor Detail

Constant

public Constant(String name,
                Type type)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

getName

public String getName()

apply

public Value apply(Unifier u)

Description copied from interface: Value

Apply a unifier to this value to get a new value.

Overrides:

apply in class Expression

occurs

public boolean occurs(Substitution s,
                      Variable v)

Description copied from interface: Value

Check whether the variable occurs in this value under the given substitution.

Overrides:

occurs in class Expression

unify

public Substitution unify(Substitution s,
                          Value e)
                   throws NotUnifiable

Description copied from interface: Value

Get the substitution which unifies this value with the given value, after applying the given substitution.

Overrides:

unify in class Expression

Following copied from interface: uk.ac.man.cs.rainbow.rapa.data.Value

Parameters:

subst - The substitution to apply first.

val - The value to unify with this value.

Returns:

The substitution that is the combination of the given substitution and whatever extra substitutions are necessary to unify the two values.

Throws:

NotUnifiable - If the two values cannot be unified.

hasVariable

public boolean hasVariable()

equals

public boolean equals(Value e)

Overrides:

equals in class Expression

subst

public Value subst(Substitution s)

Description copied from interface: Value

Apply a substitution to this value to get a new value.

Overrides:

subst in class Expression

getResultType

public Type getResultType()

Overrides:

getResultType in class Expression