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

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

All Implemented Interfaces:

Argument, Serializable, Value, VariableContainer

Direct Known Subclasses:

Variable.Named

public class Variable

extends Expression

See Also:

Serialized Form

Inner Class Summary

static class

Variable.Named

Constructor Summary

Variable()

Variable(Type type)

Method Summary

Value	apply(Unifier u) Apply a unifier to this value to get a new value.
void	compatableWith(Argument arg) Check that this value is compatable with the argument.
boolean	equals(Value e)
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

equals, evaluate, getNodeType, subst

Methods inherited from class java.lang.Object

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

Constructor Detail

Variable

public Variable()

Variable

public Variable(Type type)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

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

compatableWith

public void compatableWith(Argument arg)

Description copied from interface: Value

Check that this value is compatable with the argument.

Overrides:

compatableWith in class Expression

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

See Also:

GeneralSubstitution

getResultType

public Type getResultType()

Overrides:

getResultType in class Expression