Package org.apache.bcel.util

Class BCELifier

java.lang.Object

org.apache.bcel.classfile.EmptyVisitor

org.apache.bcel.util.BCELifier

All Implemented Interfaces:

Visitor

public class BCELifier
extends EmptyVisitor

This class takes a given JavaClass object and converts it to a Java program that creates that very class using BCEL. This gives new users of BCEL a useful example showing how things are done with BCEL. It does not cover all features of BCEL, but tries to mimic hand-written code as close as possible.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BCELifier.FLAGS	Enum corresponding to flag source.

Field Summary

Fields

Modifier and Type	Field	Description
private static java.lang.String	BASE_PACKAGE
private JavaClass	clazz
private static java.lang.String	CONSTANT_PREFIX
private ConstantPoolGen	constantPoolGen
private java.io.PrintWriter	printWriter

Constructor Summary

Constructors

Constructor	Description
BCELifier(JavaClass clazz, java.io.OutputStream out)	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
(package private) static JavaClass	getJavaClass(java.lang.String name)
static void	main(java.lang.String[] argv)	Default main method.
(package private) static java.lang.String	printArgumentTypes(Type[] argTypes)
private void	printCreate()
(package private) static java.lang.String	printFlags(int flags)
static java.lang.String	printFlags(int flags, BCELifier.FLAGS location)	Return a string with the flag settings
private void	printMain()
(package private) static java.lang.String	printType(java.lang.String signature)
(package private) static java.lang.String	printType(Type type)
void	start()	Start Java code generation
void	visitField(Field field)	Visits a Field.
void	visitJavaClass(JavaClass clazz)	Visits a JavaClass.
void	visitMethod(Method method)	Visits a Method.
void	visitStackMap(StackMap stackMap)	Visits a StackMap attribute.
void	visitStackMapEntry(StackMapEntry stackMapEntry)	Visits a StackMapEntry.
void	visitStackMapType(StackMapType stackMapType)	Visits a StackMapType object.
private void	visitStackMapTypeArray(StackMapType[] types)

Methods inherited from class org.apache.bcel.classfile.EmptyVisitor

visitAnnotation, visitAnnotationDefault, visitAnnotationEntry, visitBootstrapMethods, visitCode, visitCodeException, visitConstantClass, visitConstantDouble, visitConstantDynamic, visitConstantFieldref, visitConstantFloat, visitConstantInteger, visitConstantInterfaceMethodref, visitConstantInvokeDynamic, visitConstantLong, visitConstantMethodHandle, visitConstantMethodref, visitConstantMethodType, visitConstantModule, visitConstantNameAndType, visitConstantPackage, visitConstantPool, visitConstantString, visitConstantUtf8, visitConstantValue, visitDeprecated, visitEnclosingMethod, visitExceptionTable, visitInnerClass, visitInnerClasses, visitLineNumber, visitLineNumberTable, visitLocalVariable, visitLocalVariableTable, visitLocalVariableTypeTable, visitMethodParameter, visitMethodParameters, visitModule, visitModuleExports, visitModuleMainClass, visitModuleOpens, visitModulePackages, visitModuleProvides, visitModuleRequires, visitNestHost, visitNestMembers, visitParameterAnnotation, visitParameterAnnotationEntry, visitSignature, visitSourceFile, visitSynthetic, visitUnknown

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.bcel.classfile.Visitor

visitRecord, visitRecordComponent

Field Detail

BASE_PACKAGE

private static final java.lang.String BASE_PACKAGE

CONSTANT_PREFIX

private static final java.lang.String CONSTANT_PREFIX

clazz

private final JavaClass clazz

printWriter

private final java.io.PrintWriter printWriter

constantPoolGen

private final ConstantPoolGen constantPoolGen

Constructor Detail

BCELifier

public BCELifier(JavaClass clazz,
                 java.io.OutputStream out)

Constructs a new instance.

Parameters:

clazz - Java class to "decompile".

out - where to print the Java program in UTF-8.

Method Detail

getJavaClass

static JavaClass getJavaClass(java.lang.String name)
                       throws java.lang.ClassNotFoundException,
                              java.io.IOException

Throws:

java.lang.ClassNotFoundException

java.io.IOException

main

public static void main(java.lang.String[] argv)
                 throws java.lang.Exception

Default main method.

Parameters:

argv - command line arguments.

Throws:

java.lang.Exception - if an error occurs.

printArgumentTypes

static java.lang.String printArgumentTypes(Type[] argTypes)

printFlags

static java.lang.String printFlags(int flags)

printFlags

public static java.lang.String printFlags(int flags,
                                          BCELifier.FLAGS location)

Return a string with the flag settings

Parameters:

flags - the flags field to interpret.

location - the item type.

Returns:

the formatted string.

Since:

6.0 made public

printType

static java.lang.String printType(java.lang.String signature)

printType

static java.lang.String printType(Type type)

printCreate

private void printCreate()

printMain

private void printMain()

start

public void start()

Start Java code generation

visitField

public void visitField(Field field)

Description copied from interface: Visitor

Visits a Field.

Specified by:

visitField in interface Visitor

Overrides:

visitField in class EmptyVisitor

Parameters:

field - the field.

visitJavaClass

public void visitJavaClass(JavaClass clazz)

Description copied from interface: Visitor

Visits a JavaClass.

Specified by:

visitJavaClass in interface Visitor

Overrides:

visitJavaClass in class EmptyVisitor

Parameters:

clazz - the class.

visitMethod

public void visitMethod(Method method)

Description copied from interface: Visitor

Visits a Method.

Specified by:

visitMethod in interface Visitor

Overrides:

visitMethod in class EmptyVisitor

Parameters:

method - the method.

visitStackMap

public void visitStackMap(StackMap stackMap)

Description copied from interface: Visitor

Visits a StackMap attribute.

Specified by:

visitStackMap in interface Visitor

Overrides:

visitStackMap in class EmptyVisitor

Parameters:

stackMap - the attribute.

visitStackMapEntry

public void visitStackMapEntry(StackMapEntry stackMapEntry)

Description copied from interface: Visitor

Visits a StackMapEntry.

Specified by:

visitStackMapEntry in interface Visitor

Overrides:

visitStackMapEntry in class EmptyVisitor

Parameters:

stackMapEntry - the entry.

visitStackMapType

public void visitStackMapType(StackMapType stackMapType)

Visits a StackMapType object.

Specified by:

visitStackMapType in interface Visitor

Overrides:

visitStackMapType in class EmptyVisitor

Parameters:

stackMapType - object to visit.

Since:

6.7.1

visitStackMapTypeArray

private void visitStackMapTypeArray(StackMapType[] types)