dk.rode.thesis.interpreter
Enum CompareExpression.Comparison

java.lang.Object
  java.lang.Enum<CompareExpression.Comparison>
      dk.rode.thesis.interpreter.CompareExpression.Comparison

All Implemented Interfaces:

Serializable, Comparable<CompareExpression.Comparison>

Enclosing class:

CompareExpression<E extends Comparable<? super E>>

public static enum CompareExpression.Comparison
extends Enum<CompareExpression.Comparison>

The comparison type to be performed by a compare expression.

Author:

Gunni Rode / rode.dk

Enum Constant Summary

EQUAL
Compares expression a and b to see if they are equal.

GREATER
Compares expression a and b to see if a is greater.

GREATER_EQUAL
Compares expression a and b to see if a is equal or greater.

NOT_EQUAL
Compares expression a and b to see if they are not equal.

SMALLER
Compares expression a and b to see if a is smaller.

SMALLER_EQUAL
Compares expression a and b to see if a is smaller or equal.

Method Summary

protected abstract String	asSymbol() Return the symbol of this comparison type.
protected abstract boolean	matches(int value) Return true if this comparison type matches the value supplied as value, false if not.
static CompareExpression.Comparison	valueOf(String name) Returns the enum constant of this type with the specified name.
static CompareExpression.Comparison[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

EQUAL

public static final CompareExpression.Comparison EQUAL

Compares expression a and b to see if they are equal.

GREATER

public static final CompareExpression.Comparison GREATER

Compares expression a and b to see if a is greater.

GREATER_EQUAL

public static final CompareExpression.Comparison GREATER_EQUAL

Compares expression a and b to see if a is equal or greater.

NOT_EQUAL

public static final CompareExpression.Comparison NOT_EQUAL

Compares expression a and b to see if they are not equal.

SMALLER

public static final CompareExpression.Comparison SMALLER

Compares expression a and b to see if a is smaller.

SMALLER_EQUAL

public static final CompareExpression.Comparison SMALLER_EQUAL

Compares expression a and b to see if a is smaller or equal.

Method Detail

asSymbol

protected abstract String asSymbol()

Return the symbol of this comparison type.

Returns:

The symbol; never null;

matches

protected abstract boolean matches(int value)

Return true if this comparison type matches the value supplied as value, false if not.

Parameters:

value - The value to test.

Returns:

True if this comparison type matches value, false if it does not.

valueOf

public static CompareExpression.Comparison valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

values

public static CompareExpression.Comparison[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (CompareExpression.Comparison c : CompareExpression.Comparison.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared