Class ClassFile

Method Details

• addSourceFileAttribute

  public void addSourceFileAttribute(String sourceFileName)

  Adds a "SourceFile" attribute to this class file. (Does not check whether one exists already.)

  Parameters:

  sourceFileName -

• addDeprecatedAttribute

  public void addDeprecatedAttribute()

• getInnerClassesAttribute

  public ClassFile.InnerClassesAttribute getInnerClassesAttribute()

  Find the "InnerClasses" attribute of this class file

  Returns:

  null if this class has no "InnerClasses" attribute

• addInnerClassesAttributeEntry

  public void addInnerClassesAttributeEntry(ClassFile.InnerClassesAttribute.Entry e)

  Create an "InnerClasses" attribute if it does not exist, then add the given entry to the "InnerClasses" attribute.

  Parameters:

  e -

• getThisClassName

  public String getThisClassName()

  Returns:

  The fully qualified name of this class, e.g. "pkg1.pkg2.Outer$Inner"

• setVersion

  public void setVersion(short majorVersion, short minorVersion)

  Sets the major and minor class file version numbers (JVMS 4.1). The class file version defaults to the JDK 1.1 values (45.3) which execute on virtually every JVM.

  Parameters:

  majorVersion -

  minorVersion -

• getMajorVersion

  public short getMajorVersion()

  Returns the current major class file version number.

• getMinorVersion

  public short getMinorVersion()

  Returns the current minor class file version number.

• addConstantClassInfo

  public short addConstantClassInfo(String typeFd)

  Return the constant index number for a "CONSTANT_Class_info" structure to the class file. If the class hasn't been added before, add it to the constant pool. Otherwise return the constant number for that element of the pool.

  See Also:

  • JVM specification, section 4.4.1

• addConstantFieldrefInfo

  public short addConstantFieldrefInfo(String classFd, String fieldName, String fieldFd)

  Add a "CONSTANT_Fieldref_info" structure to the class file.

  See Also:

  • JVM specification, section 4.4.2

• addConstantMethodrefInfo

  public short addConstantMethodrefInfo(String classFd, String methodName, String methodMd)

  Add a "CONSTANT_Methodref_info" structure to the class file.

  See Also:

  • JVM specification, section 4.4.2

• addConstantInterfaceMethodrefInfo

  public short addConstantInterfaceMethodrefInfo(String classFd, String methodName, String methodMd)

  Add a "CONSTANT_InterfaceMethodref_info" structure to the class file.

  See Also:

  • JVM specification, section 4.4.2

• addConstantStringInfo

  public short addConstantStringInfo(String string)

  Add a "CONSTANT_String_info" structure to the class file.

  See Also:

  • JVM specification, section 4.4.3

• addConstantIntegerInfo

  public short addConstantIntegerInfo(int value)

  Add a "CONSTANT_Integer_info" structure to the class file.

  See Also:

  • JVM specification, section 4.4.4

• addConstantFloatInfo

  public short addConstantFloatInfo(float value)

  Add a "CONSTANT_Float_info" structure to the class file.

  See Also:

  • JVM specification, section 4.4.4

• addConstantLongInfo

  public short addConstantLongInfo(long value)

  Add a "CONSTANT_Long_info" structure to the class file.

  See Also:

  • JVM specification, section 4.4.5

• addConstantDoubleInfo

  public short addConstantDoubleInfo(double value)

  Add a "CONSTANT_Double_info" structure to the class file.

  See Also:

  • JVM specification, section 4.4.5

• addConstantUtf8Info

  public short addConstantUtf8Info(String s)

  Adds a "CONSTANT_Utf8_info" structure to the class file if no equal entry exists.

  Returns:

  The index of the already existing or newly created entry

  See Also:

  • JVM specification, section 4.4.7

• addFieldInfo

  public ClassFile.FieldInfo addFieldInfo(short accessFlags, String fieldName, String fieldTypeFd, Object optionalConstantValue)

• addMethodInfo

  public ClassFile.MethodInfo addMethodInfo(short accessFlags, String methodName, String methodMd)

• getConstantPoolInfo

  public ClassFile.ConstantPoolInfo getConstantPoolInfo(short index)

• getConstantClassName

  public String getConstantClassName(short index)

  Parameters:

  index - Index to a CONSTANT_Class_info in the constant pool

  Returns:

  The name of the denoted class in "internal form" (see JVMS 4.2)

• getConstantUtf8

  public String getConstantUtf8(short index)

  Parameters:

  index - Index to a CONSTANT_Utf8_info in the constant pool

  Returns:

  The string represented by the structure

• store

  public void store(OutputStream os) throws IOException

  Write ClassFile to an OutputStream, in "class file" format.

  Notice that if an IOException is thrown, the class file is probably written incompletely and thus invalid. The calling method must take care of this situation, e.g. by closing the output stream and then deleting the file.

  Parameters:

  os -

  Throws:

  IOException

• getSourceResourceName

  public static String getSourceResourceName(String className)

  Construct the name of a resource that could contain the source code of the class with the given name.

  Notice that member types are declared inside a different type, so the relevant source file is that of the outermost declaring class.

  Parameters:

  className - Fully qualified class name, e.g. "pkg1.pkg2.Outer$Inner"

  Returns:

  the name of the resource, e.g. "pkg1/pkg2/Outer.java"

• getClassFileResourceName

  public static String getClassFileResourceName(String className)

  Construct the name of a resource that could contain the class file of the class with the given name.

  Parameters:

  className - Fully qualified class name, e.g. "pkg1.pkg2.Outer$Inner"

  Returns:

  the name of the resource, e.g. "pkg1/pkg2/Outer$Inner.class"

• toByteArray

  public byte[] toByteArray()

  Return the byte code of this ClassFile as a byte array.