Package org.aksw.commons.util.algebra

Interface ExprOps<E,V>

public interface ExprOps<E,V>

Method Summary

Modifier and Type	Method	Description
V	asVar(E expr)	Get the expression as a variable - null if it is not a variable
E	copy(E proto, List<E> subEs)	Create a copy of an expression that serves as a prototype with the given sub expressions
static <E, V> Set<E>	getLeafs(ExprOps<E,V> exprOps, E expr)	Gets the leaf expressions of the given expression - i.e.
List<E>	getSubExprs(E expr)	Return an expression's immediate sub expressions
boolean	isFunction(E expr)	Return true iff the argument is a function expression
default boolean	isVar(E expr)
static <E, V> E	replace(ExprOps<E,V> exprOps, E expr, Function<? super E,? extends E> fn)
static <E, V> E	replaceTopDown(ExprOps<E,V> exprOps, E expr, Function<? super E,? extends E> fn)	Pre order is probably not that useful
String	toString(E expr)	Return a string representation of an expression
default Set<V>	varsMentioned(E expr)	Returns all variables mentioned in an expression.
static <E, V> Set<V>	varsMentioned(ExprOps<E,V> exprOps, E expr)	Computes the used variables.
E	varToExpr(V var)	Create an expression that represents the given variable

Method Details

getSubExprs

List<E> getSubExprs(E expr)

Return an expression's immediate sub expressions

copy

E copy(E proto,
 List<E> subEs)

Create a copy of an expression that serves as a prototype with the given sub expressions

isFunction

boolean isFunction(E expr)

Return true iff the argument is a function expression

asVar

V asVar(E expr)

Get the expression as a variable - null if it is not a variable

varToExpr

E varToExpr(V var)

Create an expression that represents the given variable

toString

String toString(E expr)

Return a string representation of an expression

isVar

default boolean isVar(E expr)

varsMentioned

default Set<V> varsMentioned(E expr)

Returns all variables mentioned in an expression. This method is provided for convenience.

varsMentioned

static <E,
V> Set<V> varsMentioned(ExprOps<E,V> exprOps,
 E expr)

Computes the used variables. Prefer varsMentioned(Object) for applications.

getLeafs

static <E,
V> Set<E> getLeafs(ExprOps<E,V> exprOps,
 E expr)

Gets the leaf expressions of the given expression - i.e. those expressions that themselves do not have any sub expressions.

replace

static <E,
V> E replace(ExprOps<E,V> exprOps,
 E expr,
 Function<? super E,? extends E> fn)

replaceTopDown

static <E,
V> E replaceTopDown(ExprOps<E,V> exprOps,
 E expr,
 Function<? super E,? extends E> fn)

Pre order is probably not that useful