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Class espresso.classfile.javaclass.ClassParser 

java.lang.Object
   |
   +----espresso.classfile.javaclass.ClassParser
public final class ClassParser
extends Object
implements Constants
Wrapper class that parses a given Java .class file. The method parse returns a JavaClass object on success. When an I/O error or an inconsistency occurs an appropiate exception is propagated back to the caller. The structure and the names comply, except for a few conveniences, exactly with the JVM specification 1.0. See this paper for further details about the structure of a bytecode file.

Variable Index

o access_flags
o attributes
o class_name_index
o constant_pool
o fields
o file
o file_name
o interfaces
o major
o methods
o minor
o superclass_name_index

Constructor Index

o ClassParser(InputStream, String)
Parse class from the given stream.
o ClassParser(String)
Parse class from given .class file.
o ClassParser(String, String)
Parse class from given .class file in a ZIP-archive

Method Index

o parse()
Parse the given Java class file and return an object that represents the contained data, i.e.
o readAttributes()
Read information about the attributes of the attributes of the class.
o readClassInfo()
Read information about the class and its super class.
o readConstantPool()
Read constant pool entries.
o readFields()
Read information about the fields of the class, i.e.
o readID()
Check whether the header of the file is ok.
o readInterfaces()
Read information about the interfaces implemented by this class.
o readMethods()
Read information about the methods of the class.
o readVersion()
Read major and minor version of compiler which created the file.

Variables

o file 
 private DataInputStream file
o file_name 
 private String file_name
o class_name_index 
 private int class_name_index
o superclass_name_index 
 private int superclass_name_index
o major 
 private int major
o minor 
 private int minor
o access_flags 
 private int access_flags
o interfaces 
 private int interfaces[]
o constant_pool 
 private ConstantPool constant_pool
o fields 
 private Field fields[]
o methods 
 private Method methods[]
o attributes 
 private Attribute attributes[]

Constructors

o ClassParser 
 public ClassParser(InputStream file,
                    String file_name)
Parse class from the given stream.

Parameters:
file - Input stream
file_name - File name
o ClassParser 
 public ClassParser(String file_name) throws IOException
Parse class from given .class file.

Parameters:
file_name - file name
o ClassParser 
 public ClassParser(String zip_file,
                    String file_name) throws IOException
Parse class from given .class file in a ZIP-archive

Parameters:
file_name - file name

Methods

o parse 
 public JavaClass parse() throws IOException, ClassFormatError
Parse the given Java class file and return an object that represents the contained data, i.e. constants, methods, fields and commands. A ClassFormatError is raised, if the file is not a valid .class file. (This does not include verification of the byte code as it is performed by the java interpreter).

Returns:
Class object representing the parsed class file
o readAttributes 
 private final void readAttributes() throws IOException, ClassFormatError
Read information about the attributes of the attributes of the class.

o readClassInfo 
 private final void readClassInfo() throws IOException, ClassFormatError
Read information about the class and its super class.

o readConstantPool 
 private final void readConstantPool() throws IOException, ClassFormatError
Read constant pool entries.

o readFields 
 private final void readFields() throws IOException, ClassFormatError
Read information about the fields of the class, i.e. its variables.

o readID 
 private final void readID() throws IOException, ClassFormatError
Check whether the header of the file is ok. Of course, this has to be the first action on successive file reads.

o readInterfaces 
 private final void readInterfaces() throws IOException, ClassFormatError
Read information about the interfaces implemented by this class.

o readMethods 
 private final void readMethods() throws IOException, ClassFormatError
Read information about the methods of the class.

o readVersion 
 private final void readVersion() throws IOException, ClassFormatError
Read major and minor version of compiler which created the file. 

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