org.codehaus.groovy.ast.tools

Class WideningCategories

java.lang.Object

org.codehaus.groovy.ast.tools.WideningCategories

public class WideningCategories
extends Object

This class provides helper methods to determine the type from a widening operation for example for a plus operation.
To determine the resulting type of for example a=exp1+exp2 we look at the conditions isIntCategory(ClassNode), isLongCategory(ClassNode), isBigIntCategory(ClassNode), isDoubleCategory(ClassNode) and isBigDecCategory(ClassNode) in that order. The first case applying to exp1 and exp2 is defining the result type of the expression.
If for example you look at x = 1 + 2l we have the first category applying to the number 1 being int, since the 1 is an int. The 2l is a long, therefore the int category will not apply and the result type can't be int. The next category in the list is long, and since both apply to long, the result type is a long.

Author:

Jochen "blackdrag" Theodorou

Constructor Summary

Constructors

Constructor and Description
WideningCategories()

Method Summary

Methods

Modifier and Type	Method and Description
static ClassNode	firstCommonSuperType(ClassNode a, ClassNode b) Given two class nodes, returns the first common supertype, or the class itself if there are equal.
static ClassNode	firstCommonSuperType(List<ClassNode> nodes) Given a list of class nodes, returns the first common supertype.
static boolean	isBigDecCategory(ClassNode type) It is of a BigDecimal category, if the provided type is a BigInteger category or a BigDecimal.
static boolean	isBigIntCategory(ClassNode type) It is of a BigInteger category, if the provided type is a long category or a BigInteger.
static boolean	isDoubleCategory(ClassNode type) It is of a double category, if the provided type is a BigDecimal, a float, double or a wrapper of those.
static boolean	isIntCategory(ClassNode type) It is of an int category, if the provided type is a byte, char, short, int or any of the wrapper.
static boolean	isLongCategory(ClassNode type) It is of a long category, if the provided type is a long, its wrapper or if it is a long category.
static boolean	isNumberCategory(ClassNode type)

Methods inherited from class java.lang.Object

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

Constructor Detail

WideningCategories

public WideningCategories()

Method Detail

isIntCategory

public static boolean isIntCategory(ClassNode type)

It is of an int category, if the provided type is a byte, char, short, int or any of the wrapper.

isLongCategory

public static boolean isLongCategory(ClassNode type)

It is of a long category, if the provided type is a long, its wrapper or if it is a long category.

isBigIntCategory

public static boolean isBigIntCategory(ClassNode type)

It is of a BigInteger category, if the provided type is a long category or a BigInteger.

isBigDecCategory

public static boolean isBigDecCategory(ClassNode type)

It is of a BigDecimal category, if the provided type is a BigInteger category or a BigDecimal.

isDoubleCategory

public static boolean isDoubleCategory(ClassNode type)

It is of a double category, if the provided type is a BigDecimal, a float, double or a wrapper of those. C(type)=double

isNumberCategory

public static boolean isNumberCategory(ClassNode type)

firstCommonSuperType

public static ClassNode firstCommonSuperType(ClassNode a,
                             ClassNode b)

Given two class nodes, returns the first common supertype, or the class itself if there are equal. For example, Double and Float would return Number, while Set and String would return Object.

Parameters:

a - first class node

b - second class node

Returns:

first common supertype

firstCommonSuperType

public static ClassNode firstCommonSuperType(List<ClassNode> nodes)

Given a list of class nodes, returns the first common supertype. For example, Double and Float would return Number, while Set and String would return Object.

Parameters:

nodes - the list of nodes for which to find the first common super type.

Returns:

first common supertype