io.parsingdata.metal.expression.value

Class BinaryValueExpression

java.lang.Object

io.parsingdata.metal.expression.value.BinaryValueExpression

All Implemented Interfaces:

ValueExpression

Direct Known Subclasses:

Add, And, Cat, Div, Mod, Mul, Or, ShiftLeft, ShiftRight, Sub

public abstract class BinaryValueExpression
extends Object
implements ValueExpression

Base class for ValueExpressions with two operands.

A BinaryValueExpression implements a ValueExpression that has two operands: left and right (both ValueExpressions). Both operands are themselves first evaluated. If at least one of the operands evaluates to Optional.empty(), the result of the ValueExpression itself will be empty as well.

For lists, values with the same index are evaluated in this manner. If lists are of unequal length, the result is a list with evaluated values the same size as the shortest list, appended with empty values to match the size of the longest list.

To implement a BinaryValueExpression, only the eval(Value, Value, ParseState, Encoding) must be implemented, handling the case of evaluating two values. This base class takes care of evaluating the operands and handling list semantics.

See Also:

UnaryValueExpression

Field Summary

Fields

Modifier and Type	Field and Description
ValueExpression	left
ValueExpression	right

Constructor Summary

Constructors

Constructor and Description
BinaryValueExpression(ValueExpression left, ValueExpression right)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
ImmutableList<Optional<Value>>	eval(ParseState parseState, Encoding encoding)
abstract Optional<Value>	eval(Value left, Value right, ParseState parseState, Encoding encoding)
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

left

public final ValueExpression left

right

public final ValueExpression right

Constructor Detail

BinaryValueExpression

public BinaryValueExpression(ValueExpression left,
                             ValueExpression right)

Method Detail

eval

public ImmutableList<Optional<Value>> eval(ParseState parseState,
                                           Encoding encoding)

Specified by:

eval in interface ValueExpression

eval

public abstract Optional<Value> eval(Value left,
                                     Value right,
                                     ParseState parseState,
                                     Encoding encoding)

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object