org.objectweb.asm.attrs
Class RuntimeVisibleParameterAnnotations

java.lang.Object
  extended by org.objectweb.asm.Attribute
      extended by org.objectweb.asm.attrs.RuntimeVisibleParameterAnnotations
Direct Known Subclasses:
ASMRuntimeVisibleParameterAnnotations

public class RuntimeVisibleParameterAnnotations
extends Attribute

The RuntimeVisibleParameterAnnotations attribute is a variable length attribute in the attributes table of the method_info structure. The RuntimeVisibleParameterAnnotations attribute records runtime-visible Java programming language annotations on the parameters of the corresponding method. Each method_info structure may contain at most one RuntimeVisibleParameterAnnotations attribute, which records all the runtime-visible Java programming language annotations on the parameters of the corresponding method. The JVM must make these annotations available so they can be returned by the appropriate reflective APIs.

The RuntimeVisibleParameterAnnotations attribute has the following format:

   RuntimeVisibleParameterAnnotations_attribute {
     u2 attribute_name_index;
     u4 attribute_length;
     u1 num_parameters;
     {
       u2 num_annotations;
       annotation annotations[num_annotations];
     } parameter_annotations[num_parameters];
   }
 
 The items of the RuntimeVisibleParameterAnnotations structure are as follows:
 
attribute_name_index
The value of the attribute_name_index item must be a valid index into the constant_pool table. The constant_pool entry at that index must be a CONSTANT_Utf8_info structure representing the string "RuntimeVisibleParameterAnnotations".
attribute_length
The value of the attribute_length item indicates the length of the attribute, excluding the initial six bytes. The value of the attribute_length item is thus dependent on the number of parameters, the number of runtime-visible annotations on each parameter, and their values.
num_parameters
The value of the num_parameters item gives the number of parameters of the method represented by the method_info structure on which the annotation occurs. (This duplicates information that could be extracted from the method descriptor.)
parameter_annotations
Each value of the parameter_annotations table represents all of the runtime-visible annotations on a single parameter. The sequence of values in the table corresponds to the sequence of parameters in the method signature. Each parameter_annotations entry contains the following two items:
num_annotations
The value of the num_annotations item indicates the number of runtime-visible annotations on the parameter corresponding to the sequence number of this parameter_annotations element.
annotations
Each value of the annotations table represents a single runtime-visible annotation on the parameter corresponding to the sequence number of this parameter_annotations element.

Author:
Eugene Kuleshov
See Also:
JSR 175 : A Metadata Facility for the Java Programming Language

Field Summary
 java.util.List parameters
          List of Lists that contains Annotation for each method parameter.
 
Fields inherited from class org.objectweb.asm.Attribute
next, type
 
Constructor Summary
RuntimeVisibleParameterAnnotations()
           
 
Method Summary
protected  Attribute read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels)
          Reads a type attribute.
 java.lang.String toString()
           
protected  ByteVector write(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals)
          Returns the byte array form of this attribute.
 
Methods inherited from class org.objectweb.asm.Attribute
getLabels, isUnknown
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

parameters

public java.util.List parameters
List of Lists that contains Annotation for each method parameter.

Constructor Detail

RuntimeVisibleParameterAnnotations

public RuntimeVisibleParameterAnnotations()
Method Detail

read

protected Attribute read(ClassReader cr,
                         int off,
                         int len,
                         char[] buf,
                         int codeOff,
                         Label[] labels)
Description copied from class: Attribute
Reads a type attribute. This method must return a new Attribute object, of type type, corresponding to the len bytes starting at the given offset, in the given class reader.

Overrides:
read in class Attribute
Parameters:
cr - the class that contains the attribute to be read.
off - index of the first byte of the attribute's content in cr.b. The 6 attribute header bytes, containing the type and the length of the attribute, are not taken into account here.
len - the length of the attribute's content.
buf - buffer to be used to call readUTF8, readClass or readConst.
codeOff - index of the first byte of code's attribute content in cr.b, or -1 if the attribute to be read is not a code attribute. The 6 attribute header bytes, containing the type and the length of the attribute, are not taken into account here.
labels - the labels of the method's code, or null if the attribute to be read is not a code attribute.
Returns:
a new Attribute object corresponding to the given bytes.

write

protected ByteVector write(ClassWriter cw,
                           byte[] code,
                           int len,
                           int maxStack,
                           int maxLocals)
Description copied from class: Attribute
Returns the byte array form of this attribute.

Overrides:
write in class Attribute
Parameters:
cw - the class to which this attribute must be added. This parameter can be used to add to the constant pool of this class the items that corresponds to this attribute.
code - the bytecode of the method corresponding to this code attribute, or null if this attribute is not a code attributes.
len - the length of the bytecode of the method corresponding to this code attribute, or null if this attribute is not a code attribute.
maxStack - the maximum stack size of the method corresponding to this code attribute, or -1 if this attribute is not a code attribute.
maxLocals - the maximum number of local variables of the method corresponding to this code attribute, or -1 if this attribute is not a code attribute.
Returns:
the byte array form of this attribute.

toString

public java.lang.String toString()
Overrides:
toString in class java.lang.Object