Package org.codehaus.groovy.ast.tools
Class WideningCategories
- java.lang.Object
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- org.codehaus.groovy.ast.tools.WideningCategories
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public class WideningCategories extends java.lang.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)
andisBigDecCategory(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.
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
WideningCategories.LowestUpperBoundClassNode
ThisClassNode
specialization is used when the lowest upper bound of two types cannot be represented by an existing type.
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Constructor Summary
Constructors Constructor Description WideningCategories()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static boolean
implementsInterfaceOrSubclassOf(ClassNode source, ClassNode targetType)
Determines if the source class implements an interface or subclasses the target type.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
isDouble(ClassNode type)
Used to check if a type is an double or Double.static boolean
isDoubleCategory(ClassNode type)
It is of a double category, if the provided type is a BigDecimal, a float, double.static boolean
isFloat(ClassNode type)
Used to check if a type is a float or Float.static boolean
isFloatingCategory(ClassNode type)
It is of a floating category, if the provided type is a a float, double.static boolean
isInt(ClassNode type)
Used to check if a type is an int or Integer.static boolean
isIntCategory(ClassNode type)
It is of an int category, if the provided type is a byte, char, short, int.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)
static ClassNode
lowestUpperBound(java.util.List<ClassNode> nodes)
Given a list of class nodes, returns the first common supertype.static ClassNode
lowestUpperBound(ClassNode a, ClassNode b)
Given two class nodes, returns the first common supertype, or the class itself if there are equal.
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Method Detail
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isInt
public static boolean isInt(ClassNode type)
Used to check if a type is an int or Integer.- Parameters:
type
- the type to check
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isDouble
public static boolean isDouble(ClassNode type)
Used to check if a type is an double or Double.- Parameters:
type
- the type to check
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isFloat
public static boolean isFloat(ClassNode type)
Used to check if a type is a float or Float.- Parameters:
type
- the type to check
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isIntCategory
public static boolean isIntCategory(ClassNode type)
It is of an int category, if the provided type is a byte, char, short, int.
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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.
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isBigIntCategory
public static boolean isBigIntCategory(ClassNode type)
It is of a BigInteger category, if the provided type is a long category or a BigInteger.
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isBigDecCategory
public static boolean isBigDecCategory(ClassNode type)
It is of a BigDecimal category, if the provided type is a BigInteger category or a BigDecimal.
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isDoubleCategory
public static boolean isDoubleCategory(ClassNode type)
It is of a double category, if the provided type is a BigDecimal, a float, double. C(type)=double
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isFloatingCategory
public static boolean isFloatingCategory(ClassNode type)
It is of a floating category, if the provided type is a a float, double. C(type)=float
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isNumberCategory
public static boolean isNumberCategory(ClassNode type)
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lowestUpperBound
public static ClassNode lowestUpperBound(java.util.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
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lowestUpperBound
public static ClassNode lowestUpperBound(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. This method is not guaranteed to return a class node which corresponds to a real type. For example, if two types have more than one interface in common and are not in the same hierarchy branch, then the returned type will be a virtual type implementing all those interfaces. Calls to this method are supposed to be made with resolved generics. This means that you can have wildcards, but no placeholder.- Parameters:
a
- first class nodeb
- second class node- Returns:
- first common supertype
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implementsInterfaceOrSubclassOf
public static boolean implementsInterfaceOrSubclassOf(ClassNode source, ClassNode targetType)
Determines if the source class implements an interface or subclasses the target type. This method takes thelowest upper bound class node
type into account, allowing to remove unnecessary casts.- Parameters:
source
- the type of interesttargetType
- the target type of interest
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