Package javassist.bytecode
Class Descriptor
- java.lang.Object
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- javassist.bytecode.Descriptor
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public class Descriptor extends Object
A support class for dealing with descriptors.See chapter 4.3 in "The Java Virtual Machine Specification (2nd ed.)"
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Nested Class Summary
Nested Classes Modifier and Type Class Description static classDescriptor.IteratorAn Iterator over a descriptor.
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Constructor Summary
Constructors Constructor Description Descriptor()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static StringappendParameter(String classname, String desc)Appends a parameter type to the parameter list represented by the given descriptor.static StringappendParameter(CtClass type, String descriptor)Appends a parameter type to the parameter list represented by the given descriptor.static intarrayDimension(String desc)Computes the dimension of the array represented by the given descriptor.static StringchangeReturnType(String classname, String desc)Changes the return type included in the given descriptor.static intdataSize(String desc)Computes the data size specified by the given descriptor.static booleaneqParamTypes(String desc1, String desc2)Returns true if the list of the parameter types of desc1 is equal to that of desc2.static StringgetParamDescriptor(String decl)Returns the signature of the given descriptor.static CtClass[]getParameterTypes(String desc, ClassPool cp)Returns theCtClassobjects representing the parameter types specified by the given descriptor.static CtClassgetReturnType(String desc, ClassPool cp)Returns theCtClassobject representing the return type specified by the given descriptor.static StringinsertParameter(String classname, String desc)Inserts a parameter type at the beginning of the parameter list represented by the given descriptor.static StringinsertParameter(CtClass type, String descriptor)Inserts a parameter type at the beginning of the parameter list represented by the given descriptor.static intnumOfParameters(String desc)Returns the number of the prameters included in the given descriptor.static Stringof(String classname)Converts to a descriptor from a Java class namestatic Stringof(CtClass type)Returns the descriptor representing the given type.static StringofConstructor(CtClass[] paramTypes)Returns the descriptor representing a constructor receiving the given parameter types.static StringofMethod(CtClass returnType, CtClass[] paramTypes)Returns the descriptor representing a method that receives the given parameter types and returns the given type.static StringofParameters(CtClass[] paramTypes)Returns the descriptor representing a list of parameter types.static intparamSize(String desc)Computes the data size of parameters.static Stringrename(String desc, String oldname, String newname)Substitutes a class name in the given descriptor string.static Stringrename(String desc, Map<String,String> map)Substitutes class names in the given descriptor string according to the givenmap.static StringtoArrayComponent(String desc, int dim)Returns the descriptor of the type of the array component.static StringtoClassName(String descriptor)Converts to a Java class name from a descriptor.static CtClasstoCtClass(String desc, ClassPool cp)Returns aCtClassobject representing the type specified by the given descriptor.static StringtoJavaName(String classname)Converts a class name from the internal representation used in the JVM to the normal one used in Java.static StringtoJvmName(String classname)Converts a class name into the internal representation used in the JVM.static StringtoJvmName(CtClass clazz)Returns the internal representation of the class name in the JVM.static StringtoString(String desc)Returns a human-readable representation of the given descriptor.
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Method Detail
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toJvmName
public static String toJvmName(String classname)
Converts a class name into the internal representation used in the JVM.Note that
toJvmName(toJvmName(s))is equivalent totoJvmName(s).
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toJavaName
public static String toJavaName(String classname)
Converts a class name from the internal representation used in the JVM to the normal one used in Java. This method does not deal with an array type name such as "[Ljava/lang/Object;" and "[I;". For such names, usetoClassName().- See Also:
toClassName(String)
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toJvmName
public static String toJvmName(CtClass clazz)
Returns the internal representation of the class name in the JVM.
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toClassName
public static String toClassName(String descriptor)
Converts to a Java class name from a descriptor.- Parameters:
descriptor- type descriptor.
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rename
public static String rename(String desc, String oldname, String newname)
Substitutes a class name in the given descriptor string.- Parameters:
desc- descriptor stringoldname- replaced JVM class namenewname- substituted JVM class name- See Also:
toJvmName(String)
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rename
public static String rename(String desc, Map<String,String> map)
Substitutes class names in the given descriptor string according to the givenmap.- Parameters:
map- a map between replaced and substituted JVM class names.- See Also:
toJvmName(String)
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ofConstructor
public static String ofConstructor(CtClass[] paramTypes)
Returns the descriptor representing a constructor receiving the given parameter types.- Parameters:
paramTypes- parameter types
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ofMethod
public static String ofMethod(CtClass returnType, CtClass[] paramTypes)
Returns the descriptor representing a method that receives the given parameter types and returns the given type.- Parameters:
returnType- return typeparamTypes- parameter types
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ofParameters
public static String ofParameters(CtClass[] paramTypes)
Returns the descriptor representing a list of parameter types. For example, if the given parameter types are twoint, then this method returns"(II)".- Parameters:
paramTypes- parameter types
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appendParameter
public static String appendParameter(String classname, String desc)
Appends a parameter type to the parameter list represented by the given descriptor.classnamemust not be an array type.- Parameters:
classname- parameter type (not primitive type)desc- descriptor
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insertParameter
public static String insertParameter(String classname, String desc)
Inserts a parameter type at the beginning of the parameter list represented by the given descriptor.classnamemust not be an array type.- Parameters:
classname- parameter type (not primitive type)desc- descriptor
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appendParameter
public static String appendParameter(CtClass type, String descriptor)
Appends a parameter type to the parameter list represented by the given descriptor. The appended parameter becomes the last parameter.- Parameters:
type- the type of the appended parameter.descriptor- the original descriptor.
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insertParameter
public static String insertParameter(CtClass type, String descriptor)
Inserts a parameter type at the beginning of the parameter list represented by the given descriptor.- Parameters:
type- the type of the inserted parameter.descriptor- the descriptor of the method.
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changeReturnType
public static String changeReturnType(String classname, String desc)
Changes the return type included in the given descriptor.classnamemust not be an array type.- Parameters:
classname- return typedesc- descriptor
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getParameterTypes
public static CtClass[] getParameterTypes(String desc, ClassPool cp) throws NotFoundException
Returns theCtClassobjects representing the parameter types specified by the given descriptor.- Parameters:
desc- descriptorcp- the class pool used for obtaining aCtClassobject.- Throws:
NotFoundException
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eqParamTypes
public static boolean eqParamTypes(String desc1, String desc2)
Returns true if the list of the parameter types of desc1 is equal to that of desc2. For example, "(II)V" and "(II)I" are equal.
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getParamDescriptor
public static String getParamDescriptor(String decl)
Returns the signature of the given descriptor. The signature does not include the return type. For example, the signature of "(I)V" is "(I)".
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getReturnType
public static CtClass getReturnType(String desc, ClassPool cp) throws NotFoundException
Returns theCtClassobject representing the return type specified by the given descriptor.- Parameters:
desc- descriptorcp- the class pool used for obtaining aCtClassobject.- Throws:
NotFoundException
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numOfParameters
public static int numOfParameters(String desc)
Returns the number of the prameters included in the given descriptor.- Parameters:
desc- descriptor
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toCtClass
public static CtClass toCtClass(String desc, ClassPool cp) throws NotFoundException
Returns aCtClassobject representing the type specified by the given descriptor.This method works even if the package-class separator is not
/but.(period). For example, it acceptsLjava.lang.Object;as well asLjava/lang/Object;.- Parameters:
desc- descriptor.cp- the class pool used for obtaining aCtClassobject.- Throws:
NotFoundException
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arrayDimension
public static int arrayDimension(String desc)
Computes the dimension of the array represented by the given descriptor. For example, if the descriptor is"[[I", then this method returns 2.- Parameters:
desc- the descriptor.- Returns:
- 0 if the descriptor does not represent an array type.
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toArrayComponent
public static String toArrayComponent(String desc, int dim)
Returns the descriptor of the type of the array component. For example, if the given descriptor is"[[Ljava/lang/String;"and the given dimension is 2, then this method returns"Ljava/lang/String;".- Parameters:
desc- the descriptor.dim- the array dimension.
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dataSize
public static int dataSize(String desc)
Computes the data size specified by the given descriptor. For example, if the descriptor is "D", this method returns 2.If the descriptor represents a method type, this method returns (the size of the returned value) - (the sum of the data sizes of all the parameters). For example, if the descriptor is
"(I)D", then this method returns 1 (= 2 - 1).- Parameters:
desc- descriptor
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paramSize
public static int paramSize(String desc)
Computes the data size of parameters. If one of the parameters is double type, the size of that parameter is 2 words. For example, if the given descriptor is"(IJ)D", then this method returns 3. The size of the return type is not computed.- Parameters:
desc- a method descriptor.
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