nz.org.venice.parser
Class ExpressionFactory

java.lang.Object
  nz.org.venice.parser.ExpressionFactory

public class ExpressionFactory

extends java.lang.Object

Create an executable expression from the given token and arguments.

Author:

Andrew Leppard

Method Summary

static Expression	newExpression(Expression exp, Expression[] children)
static Expression	newExpression(java.lang.String inputExpressionString)
static Expression	newExpression(Token token) Create an executable terminal expression from the given token.
static Expression	newExpression(Token token, Expression arg1) Create an executable unary expression from the given token and argument.
static Expression	newExpression(Token token, Expression arg1, Expression arg2) Create an executable binary expression from the given token and arguments.
static Expression	newExpression(Token token, Expression arg1, Expression arg2, Expression arg3) Create an executable ternary expression from the given token and arguments.
static Expression	newExpression(Token token, Expression arg1, Expression arg2, Expression arg3, Expression arg4) Create an executable quaternary expression from the given token and arguments.
static Expression	setChild(Expression exp, Expression child, int index)

Methods inherited from class java.lang.Object

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

Method Detail

newExpression

public static Expression newExpression(Token token)

Create an executable terminal expression from the given token.

Parameters:

token - the terminal expression, e.g. a number

Returns:

an executable expression

newExpression

public static Expression newExpression(Token token,
                                       Expression arg1)

Create an executable unary expression from the given token and argument.

Parameters:

token - the unary expression, e.g. "not(X)"

arg1 - the first argument

Returns:

an executable expression

newExpression

public static Expression newExpression(Token token,
                                       Expression arg1,
                                       Expression arg2)

Create an executable binary expression from the given token and arguments.

Parameters:

token - the binary expression, e.g. "X and Y"

arg1 - the first argument

arg2 - the second argument

Returns:

an executable expression

newExpression

public static Expression newExpression(Token token,
                                       Expression arg1,
                                       Expression arg2,
                                       Expression arg3)

Create an executable ternary expression from the given token and arguments.

Parameters:

token - the ternary expression, e.g. "if(X) { Y } else { Z }"

arg1 - the first argument

arg2 - the second argument

arg3 - the third argument

Returns:

an executable expression

newExpression

public static Expression newExpression(Token token,
                                       Expression arg1,
                                       Expression arg2,
                                       Expression arg3,
                                       Expression arg4)

Create an executable quaternary expression from the given token and arguments.

Parameters:

token - the ternary expression, e.g. "if(X) { Y } else { Z }"

arg1 - the first argument

arg2 - the second argument

arg3 - the third argument

arg4 - the fourth argument

Returns:

an executable expression

newExpression

public static Expression newExpression(java.lang.String inputExpressionString)

newExpression

public static Expression newExpression(Expression exp,
                                       Expression[] children)

setChild

public static Expression setChild(Expression exp,
                                  Expression child,
                                  int index)