com.bea.p13n.expression
Interface UnificationList

public interface UnificationList

An interface for a class that maps variable names to the variable values.

Field Summary

static Byte

NO_BOUND_VALUE A constant that is used as a marker to indicate that there is no value bound for a particular name string.

Method Summary

void	addObject(String name, Object object) Adds a new object to the unbound list.
void	append(UnificationList unificationList) Appends another UnificationList onto the end of this.
void	bind(String name, Object value) Binds a value to a given name.
boolean	contains(Object value) Tests whether this contains the given value.
boolean	containsBound(String value) Tests whether this contains the given value and the value has been bound to a variable name.
Object	getBound(String name, Class classType) Returns the Object that has been bound to a name.
Object	getValue(String name, Class classType) Returns the value of a bound variable or get an unbound value and then bind it.

Field Detail

NO_BOUND_VALUE

public static final Byte NO_BOUND_VALUE

A constant that is used as a marker to indicate that there is no value bound for a particular name string.

Method Detail

addObject

public void addObject(String name,
                      Object object)

Adds a new object to the unbound list.

Parameters:

name - the variable name for the value.

append

public void append(UnificationList unificationList)

Appends another UnificationList onto the end of this.

bind

public void bind(String name,
                 Object value)

Binds a value to a given name.

Parameters:

name - the variable name for the value.

value - the value to be associated with the name.

contains

public boolean contains(Object value)

Tests whether this contains the given value. The contains test is done by matching the references.

Parameters:

value - the Object to be tested for.

Returns:

true if this UnificationList contains the given Object.

containsBound

public boolean containsBound(String value)

Tests whether this contains the given value and the value has been bound to a variable name. The contains test is done by matching the references.

Parameters:

value - the Object to be tested for.

Returns:

true if this UnificationList contains the given Object.

getBound

public Object getBound(String name,
                       Class classType)

Returns the Object that has been bound to a name.

Parameters:

name - the variable name for the value.

classType - the class type of the value requested.

Returns:

a bound value or null if none was found.

getValue

public Object getValue(String name,
                       Class classType)

Returns the value of a bound variable or get an unbound value and then bind it.

Parameters:

name - the variable name for the value.

classType - the class type of the value requested.

Returns:

a bound or unbound value or null if none was found.