sysModel.classFile
Class ClassFile

java.lang.Object
  sysModel.classFile.ClassFile

public class ClassFile
extends java.lang.Object

Represents a Java class file.

Author:

Mathias Ricken

Field Summary

private java.util.ArrayList<AAttributeInfo>	_attributes Attributes of the class.
private short	_classAccessFlags Class access flags.
private ConstantPool	_constantPool Constant pool.
private java.util.ArrayList<FieldInfo>	_fields Fields in the class.
private java.util.ArrayList<ClassPoolInfo>	_interfaces Class information about implemented interfaces.
private short	_majorVersion Major version.
private java.util.ArrayList<MethodInfo>	_methods Methods in the class.
private short	_minorVersion Minor version.
private ClassPoolInfo	_superClass Class information about the superclass.
private ClassPoolInfo	_thisClass Class information about this class.
static int	ACC_ABSTRACT
static int	ACC_ANNOTATION
static int	ACC_BRIDGE
static int	ACC_ENUM
static int	ACC_FINAL
static int	ACC_INTERFACE
static int	ACC_NATIVE
static int	ACC_PRIVATE
static int	ACC_PROTECTED
static int	ACC_PUBLIC
static int	ACC_STATIC
static int	ACC_STRICT
static int	ACC_SYNCHRONIZED
static int	ACC_SYNTHETIC
static int	ACC_TRANSIENT
static int	ACC_VARARGS
static int	ACC_VOLATILE
private static int	JAVA_FILE_MAGIC Java file magic, 0xCAFEBABE.

Constructor Summary

ClassFile(byte[] b)
Constructor.

ClassFile(java.io.InputStream in)
Constructor.

ClassFile(short majorVersion, short minorVersion, short classAccessFlags, java.lang.String thisClassName, java.lang.String superClassName)
Create a new ClassFile instance.

Method Summary

void	addAttribute(AAttributeInfo newAttribute) Add an attribute to the class.
short[]	addConstantPoolItems(APoolInfo[] items) Add new items to the constant pool.
short	addField(java.lang.String className, java.lang.String fieldName, java.lang.String fieldDescriptor, boolean addToFields, short accessFlags) Add the constant pool items for a field "fieldName:fieldDescriptor" in class "className".
short	addMethodToConstantPool(java.lang.String className, java.lang.String methodName, java.lang.String methodDescriptor) Add the constant pool items for a method "methodName:methodDescriptor" in class "className".
short	findMethodInConstantPool(java.lang.String className, java.lang.String methodName, java.lang.String methodDescriptor) Find the method info in the constant pool for a method "methodName:methodDescriptor" in class "className".
AAttributeInfo	getAttribute(java.lang.String name) Return the attribute with the specified name.
java.util.ArrayList<AAttributeInfo>	getAttributes() Accessor for the attributes list.
short	getClassAccessFlags() Accessor for the class access flags.
ConstantPool	getConstantPool() Accessor for the constant pool.
APoolInfo	getConstantPoolItem(short index) Return a constant pool item from this class.
java.util.ArrayList<FieldInfo>	getFields() Accessor for the fields list.
java.util.ArrayList<ClassPoolInfo>	getInterfaces() Accessor for the interface list.
short	getMajorVersion() Accessor for the major version.
java.util.ArrayList<MethodInfo>	getMethods() Accessor for the methods list.
short	getMinorVersion() Accessor for the minor version.
ClassPoolInfo	getSuperClass() Accessor for the superclass.
java.lang.String	getSuperClassName() Return the name of the super class or the empty string, if this class is java.lang.Object.
ClassPoolInfo	getThisClass() Accessor for this class.
java.lang.String	getThisClassName() Return the name of this class.
protected void	readAttributes(java.io.DataInputStream di) Read class file attributes.
protected void	readClassInfo(java.io.DataInputStream di) Read class information.
protected void	readConstantPool(java.io.DataInputStream di) Read constant pool.
protected void	readFields(java.io.DataInputStream di) Read class file fields.
protected void	readHeader(java.io.DataInputStream di) Read a class file header.
protected void	readInterfaces(java.io.DataInputStream di) Read class file interfaces.
protected void	readMethods(java.io.DataInputStream di) Read class file methods.
void	setClassAccessFlags(short classAccessFlags) Mutator for the class access flags.
void	setMajorVersion(short majorVersion) Mutator for the major version.
void	setMinorVersion(short minorVersion) Mutator for the minor version.
void	setSuperClass(ClassPoolInfo cpi) Mutator for the superclass.
void	setThisClass(ClassPoolInfo cpi) Mutator for the this class.
java.lang.String	toString() Return a human-readable version of this class.
java.lang.String	toStringVerbose() Return a verbose human-readable version of this class.
java.lang.String	toStringVerbose(boolean lineNumbers, boolean PCs) Return a verbose human-readable version of this class.
void	write(java.io.OutputStream out) Write class file into stream.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

_majorVersion

private short _majorVersion

Major version.

_minorVersion

private short _minorVersion

Minor version.

_constantPool

private ConstantPool _constantPool

Constant pool.

_classAccessFlags

private short _classAccessFlags

Class access flags.

_thisClass

private ClassPoolInfo _thisClass

Class information about this class.

_superClass

private ClassPoolInfo _superClass

Class information about the superclass.

_interfaces

private java.util.ArrayList<ClassPoolInfo> _interfaces

Class information about implemented interfaces.

_fields

private java.util.ArrayList<FieldInfo> _fields

Fields in the class.

_methods

private java.util.ArrayList<MethodInfo> _methods

Methods in the class.

_attributes

private java.util.ArrayList<AAttributeInfo> _attributes

Attributes of the class.

ACC_PUBLIC

public static final int ACC_PUBLIC

See Also:

Constant Field Values

ACC_PRIVATE

public static final int ACC_PRIVATE

See Also:

Constant Field Values

ACC_PROTECTED

public static final int ACC_PROTECTED

See Also:

Constant Field Values

ACC_STATIC

public static final int ACC_STATIC

See Also:

Constant Field Values

ACC_FINAL

public static final int ACC_FINAL

See Also:

Constant Field Values

ACC_SYNCHRONIZED

public static final int ACC_SYNCHRONIZED

See Also:

Constant Field Values

ACC_VOLATILE

public static final int ACC_VOLATILE

See Also:

Constant Field Values

ACC_BRIDGE

public static final int ACC_BRIDGE

See Also:

Constant Field Values

ACC_TRANSIENT

public static final int ACC_TRANSIENT

See Also:

Constant Field Values

ACC_VARARGS

public static final int ACC_VARARGS

See Also:

Constant Field Values

ACC_NATIVE

public static final int ACC_NATIVE

See Also:

Constant Field Values

ACC_INTERFACE

public static final int ACC_INTERFACE

See Also:

Constant Field Values

ACC_ABSTRACT

public static final int ACC_ABSTRACT

See Also:

Constant Field Values

ACC_STRICT

public static final int ACC_STRICT

See Also:

Constant Field Values

ACC_SYNTHETIC

public static final int ACC_SYNTHETIC

See Also:

Constant Field Values

ACC_ANNOTATION

public static final int ACC_ANNOTATION

See Also:

Constant Field Values

ACC_ENUM

public static final int ACC_ENUM

See Also:

Constant Field Values

JAVA_FILE_MAGIC

private static final int JAVA_FILE_MAGIC

Java file magic, 0xCAFEBABE.

See Also:

Constant Field Values

Constructor Detail

ClassFile

public ClassFile(short majorVersion,
                 short minorVersion,
                 short classAccessFlags,
                 java.lang.String thisClassName,
                 java.lang.String superClassName)

Create a new ClassFile instance.

Parameters:

majorVersion - major class file version

minorVersion - minor class file version

classAccessFlags - class access flags

thisClassName - class name

superClassName - superclass name

ClassFile

public ClassFile(java.io.InputStream in)
          throws java.io.IOException,
                 java.lang.ClassFormatError

Constructor.

Parameters:

in - input stream with class file

Throws:

java.io.IOException

java.lang.ClassFormatError

ClassFile

public ClassFile(byte[] b)
          throws java.io.IOException,
                 java.lang.ClassFormatError

Constructor.

Parameters:

b - byte array

Throws:

java.io.IOException

java.lang.ClassFormatError

Method Detail

readHeader

protected void readHeader(java.io.DataInputStream di)
                   throws java.io.IOException,
                          java.lang.ClassFormatError

Read a class file header.

Parameters:

di - stream

Throws:

java.io.IOException

java.lang.ClassFormatError

readConstantPool

protected void readConstantPool(java.io.DataInputStream di)
                         throws java.io.IOException,
                                java.lang.ClassFormatError

Read constant pool.

Parameters:

di - stream

Throws:

java.io.IOException

java.lang.ClassFormatError

readClassInfo

protected void readClassInfo(java.io.DataInputStream di)
                      throws java.io.IOException,
                             java.lang.ClassFormatError

Read class information.

Parameters:

di - stream

Throws:

java.io.IOException

java.lang.ClassFormatError

readInterfaces

protected void readInterfaces(java.io.DataInputStream di)
                       throws java.io.IOException,
                              java.lang.ClassFormatError

Read class file interfaces.

Parameters:

di - stream

Throws:

java.io.IOException

java.lang.ClassFormatError

readFields

protected void readFields(java.io.DataInputStream di)
                   throws java.io.IOException,
                          java.lang.ClassFormatError

Read class file fields.

Parameters:

di - stream

Throws:

java.io.IOException

java.lang.ClassFormatError

readMethods

protected void readMethods(java.io.DataInputStream di)
                    throws java.io.IOException,
                           java.lang.ClassFormatError

Read class file methods.

Parameters:

di - stream

Throws:

java.io.IOException

java.lang.ClassFormatError

readAttributes

protected void readAttributes(java.io.DataInputStream di)
                       throws java.io.IOException,
                              java.lang.ClassFormatError

Read class file attributes.

Parameters:

di - stream

Throws:

java.io.IOException

java.lang.ClassFormatError

write

public void write(java.io.OutputStream out)
           throws java.io.IOException

Write class file into stream.

Parameters:

out - stream

Throws:

java.io.IOException

getThisClassName

public java.lang.String getThisClassName()

Return the name of this class.

Returns:

name of this class

getSuperClassName

public java.lang.String getSuperClassName()

Return the name of the super class or the empty string, if this class is java.lang.Object.

Returns:

name of super class

toString

public java.lang.String toString()

Return a human-readable version of this class.

Overrides:

toString in class java.lang.Object

Returns:

string

toStringVerbose

public java.lang.String toStringVerbose()

Return a verbose human-readable version of this class.

Returns:

verbose string

toStringVerbose

public java.lang.String toStringVerbose(boolean lineNumbers,
                                        boolean PCs)

Return a verbose human-readable version of this class.

Parameters:

lineNumbers - print line numbers

PCs - print PC values

Returns:

verbose string

getConstantPoolItem

public APoolInfo getConstantPoolItem(short index)

Return a constant pool item from this class. This reindexes the constant pool item to make sure the indices are still correct.

Parameters:

index - index of the item

Returns:

pool item, or null if out of range

addConstantPoolItems

public short[] addConstantPoolItems(APoolInfo[] items)

Add new items to the constant pool. The items must have been resolved already. The list is pruned to avoid adding items to the pool that are already there.

The function first goes through the list and identifies all those value items (int, long, float, double, ASCII, and Unicode) that are already in the pool. If an item is already in the pool, it is not added again. Furthermore, if an item is an ASCII or Unicode UTF item, then all the references to that item present in the list of new items are changed to point to the item in pool. This is only done for ASCII and Unicode UTF items since they are the only ones referenced from other items.

This process is repeated for all reference items (class, field, method, interface method, name-and-type, and string) in the list. Here, only name-and-type and class are referenced from other items, so references to them are changed to point to the pool if they are already in the pool.

Finally, items not yet in the pool are added.

Parameters:

items - array of new items

Returns:

array with indices of added items

addAttribute

public void addAttribute(AAttributeInfo newAttribute)

Add an attribute to the class.

Parameters:

newAttribute - new attribute

getAttribute

public AAttributeInfo getAttribute(java.lang.String name)

Return the attribute with the specified name.

Parameters:

name - attribute name

Returns:

attribute or null if not found

getMinorVersion

public short getMinorVersion()

Accessor for the minor version.

Returns:

minor version

setMinorVersion

public void setMinorVersion(short minorVersion)

Mutator for the minor version.

Parameters:

minorVersion - new minor version

getMajorVersion

public short getMajorVersion()

Accessor for the major version.

Returns:

major version

setMajorVersion

public void setMajorVersion(short majorVersion)

Mutator for the major version.

Parameters:

majorVersion - new major version

getClassAccessFlags

public short getClassAccessFlags()

Accessor for the class access flags.

Returns:

access flags

setClassAccessFlags

public void setClassAccessFlags(short classAccessFlags)

Mutator for the class access flags.

Parameters:

classAccessFlags - new flags

getSuperClass

public ClassPoolInfo getSuperClass()

Accessor for the superclass.

Returns:

superclass information

setSuperClass

public void setSuperClass(ClassPoolInfo cpi)

Mutator for the superclass.

Parameters:

cpi - superclass information

getThisClass

public ClassPoolInfo getThisClass()

Accessor for this class.

Returns:

this class

setThisClass

public void setThisClass(ClassPoolInfo cpi)

Mutator for the this class.

Parameters:

cpi - this class information

getInterfaces

public java.util.ArrayList<ClassPoolInfo> getInterfaces()

Accessor for the interface list.

Returns:

interface list

getFields

public java.util.ArrayList<FieldInfo> getFields()

Accessor for the fields list.

Returns:

fields list

getMethods

public java.util.ArrayList<MethodInfo> getMethods()

Accessor for the methods list.

Returns:

methods list

getAttributes

public java.util.ArrayList<AAttributeInfo> getAttributes()

Accessor for the attributes list.

Returns:

methods list

getConstantPool

public ConstantPool getConstantPool()

Accessor for the constant pool.

Returns:

methods list

addMethodToConstantPool

public short addMethodToConstantPool(java.lang.String className,
                                     java.lang.String methodName,
                                     java.lang.String methodDescriptor)

Add the constant pool items for a method "methodName:methodDescriptor" in class "className".

Parameters:

className - class name

methodName - method name

methodDescriptor - method descriptor

Returns:

constant pool index of method info

addField

public short addField(java.lang.String className,
                      java.lang.String fieldName,
                      java.lang.String fieldDescriptor,
                      boolean addToFields,
                      short accessFlags)

Add the constant pool items for a field "fieldName:fieldDescriptor" in class "className".

Parameters:

className - class name

fieldName - field name

fieldDescriptor - field descriptor

addToFields - true if a new field should be added to the fields list as well

accessFlags - access flags (only if addToFields is true)

Returns:

constant pool index of field info

findMethodInConstantPool

public short findMethodInConstantPool(java.lang.String className,
                                      java.lang.String methodName,
                                      java.lang.String methodDescriptor)

Find the method info in the constant pool for a method "methodName:methodDescriptor" in class "className".

Parameters:

className - class name

methodName - method name

methodDescriptor - method descriptor

Returns:

constant pool index of the method, or 0 if not found