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.ObjectThis 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 SummaryNested Classes Modifier and Type Class Description static classWideningCategories.LowestUpperBoundClassNodeThisClassNodespecialization is used when the lowest upper bound of two types cannot be represented by an existing type.
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Constructor SummaryConstructors Constructor Description WideningCategories()
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Method SummaryAll Methods Static Methods Concrete Methods Modifier and Type Method Description static booleanimplementsInterfaceOrSubclassOf(ClassNode source, ClassNode targetType)Determines if the source class implements an interface or subclasses the target type.static booleanisBigDecCategory(ClassNode type)It is of a BigDecimal category, if the provided type is a BigInteger category or a BigDecimal.static booleanisBigIntCategory(ClassNode type)It is of a BigInteger category, if the provided type is a long category or a BigInteger.static booleanisDouble(ClassNode type)Used to check if a type is an double or Double.static booleanisDoubleCategory(ClassNode type)It is of a double category, if the provided type is a BigDecimal, a float, double.static booleanisFloat(ClassNode type)Used to check if a type is a float or Float.static booleanisFloatingCategory(ClassNode type)It is of a floating category, if the provided type is a a float, double.static booleanisInt(ClassNode type)Used to check if a type is an int or Integer.static booleanisIntCategory(ClassNode type)It is of an int category, if the provided type is a byte, char, short, int.static booleanisLongCategory(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 booleanisNumberCategory(ClassNode type)static ClassNodelowestUpperBound(java.util.List<ClassNode> nodes)Given a list of class nodes, returns the first common supertype.static ClassNodelowestUpperBound(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- 
isIntpublic 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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isDoublepublic 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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isFloatpublic 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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isIntCategorypublic 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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isLongCategorypublic 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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isBigIntCategorypublic 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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isBigDecCategorypublic 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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isDoubleCategorypublic 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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isFloatingCategorypublic 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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isNumberCategorypublic static boolean isNumberCategory(ClassNode type) 
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lowestUpperBoundpublic 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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lowestUpperBoundpublic 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 node
- b- second class node
- Returns:
- first common supertype
 
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implementsInterfaceOrSubclassOfpublic 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 nodetype into account, allowing to remove unnecessary casts.- Parameters:
- source- the type of interest
- targetType- the target type of interest
 
 
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