io.parsingdata.metal.expression.comparison

Class ComparisonExpression

java.lang.Object

io.parsingdata.metal.expression.comparison.ComparisonExpression

All Implemented Interfaces:

Expression

Direct Known Subclasses:

Eq, EqNum, EqStr, GtEqNum, GtNum, LtEqNum, LtNum

public abstract class ComparisonExpression
extends Object
implements Expression

Base class for all ComparisonExpression implementations.

Specifies two input ValueExpressions that are to be evaluated and their results compared. Handles evaluation of inputs and resulting lists. The abstract compare(Value, Value) method is then called for individual values.

The value argument may be null, in which case it is not evaluated and the output value is substituted with a list containing only the Value most recently added to the ParseState.

Field Summary

Fields

Modifier and Type	Field and Description
ValueExpression	predicate
ValueExpression	value

Constructor Summary

Constructors

Constructor and Description
ComparisonExpression(ValueExpression value, ValueExpression predicate)

Method Summary

Modifier and Type	Method and Description
abstract boolean	compare(Value left, Value right)
boolean	equals(Object obj)
boolean	eval(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

value

public final ValueExpression value

predicate

public final ValueExpression predicate

Constructor Detail

ComparisonExpression

public ComparisonExpression(ValueExpression value,
                            ValueExpression predicate)

Method Detail

eval

public boolean eval(ParseState parseState,
                    Encoding encoding)

Specified by:

eval in interface Expression

compare

public abstract boolean compare(Value left,
                                Value right)

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