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Oracle Fusion Middleware Java API Reference for Oracle TopLink 11g Release 1 (11.1.1) B32476-02 |
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java.lang.Object
oracle.toplink.libraries.asm.ClassWriter
public class ClassWriter
A ClassVisitor
that generates Java class files. More precisely this visitor generates a byte array conforming to the Java class file format. It can be used alone, to generate a Java class "from scratch", or with one or more ClassReader
and adapter class visitor to generate a modified class from one or more existing Java classes.
Constructor Summary | |
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ClassWriter(boolean computeMaxs) Constructs a new ClassWriter object. |
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ClassWriter(boolean computeMaxs, boolean skipUnknownAttributes) Constructs a new ClassWriter object. |
Method Summary | |
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int |
newClass(java.lang.String value) Adds a class reference to the constant pool of the class being build. |
int |
newConst(java.lang.Object cst) Adds a number or string constant to the constant pool of the class being build. |
int |
newConstDouble(double d) |
int |
newConstFloat(float f) |
int |
newConstInt(int i) |
int |
newConstLong(long l) |
int |
newField(java.lang.String owner, java.lang.String name, java.lang.String desc) Adds a field reference to the constant pool of the class being build. |
int |
newMethod(java.lang.String owner, java.lang.String name, java.lang.String desc, boolean itf) Adds a method reference to the constant pool of the class being build. |
int |
newNameType(java.lang.String name, java.lang.String desc) Adds a name and type to the constant pool of the class being build. |
int |
newUTF8(java.lang.String value) Adds an UTF8 string to the constant pool of the class being build. |
byte |
toByteArray() Returns the bytecode of the class that was build with this class writer. |
void |
visit(int version, int access, java.lang.String name, java.lang.String superName, java.lang.String[] interfaces, java.lang.String sourceFile) Visits the header of the class. |
void |
visitAttribute(Attribute attr) Visits a non standard attribute of the class. |
void |
visitEnd() Visits the end of the class. |
void |
visitField(int access, java.lang.String name, java.lang.String desc, java.lang.Object value, Attribute attrs) Visits a field of the class. |
void |
visitInnerClass(java.lang.String name, java.lang.String outerName, java.lang.String innerName, int access) Visits information about an inner class. |
CodeVisitor |
visitMethod(int access, java.lang.String name, java.lang.String desc, java.lang.String[] exceptions, Attribute attrs) Visits a method of the class. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ClassWriter(boolean computeMaxs)
ClassWriter
object.
computeMaxs
- true if the maximum stack size and the maximum number of local variables must be automatically computed. If this flag is true, then the arguments of the visitMaxs
method of the CodeVisitor
returned by the visitMethod
method will be ignored, and computed automatically from the signature and the bytecode of each method.public ClassWriter(boolean computeMaxs, boolean skipUnknownAttributes)
ClassWriter
object.
computeMaxs
- true if the maximum stack size and the maximum number of local variables must be automatically computed. If this flag is true, then the arguments of the visitMaxs
method of the CodeVisitor
returned by the visitMethod
method will be ignored, and computed automatically from the signature and the bytecode of each method.skipUnknownAttributes
- true to silently ignore unknown attributes, or false to throw an exception if an unknown attribute is found.Method Detail |
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public void visit(int version, int access, java.lang.String name, java.lang.String superName, java.lang.String[] interfaces, java.lang.String sourceFile)
visit
in interface ClassVisitor
version
- the class version.access
- the class's access flags (see Constants
). This parameter also indicates if the class is deprecated.name
- the internal name of the class (see getInternalName
).superName
- the internal of name of the super class (see getInternalName
). For interfaces, the super class is Object
. May be null, but only for the java.lang.Object
class.interfaces
- the internal names of the class's interfaces (see getInternalName
). May be null.sourceFile
- the name of the source file from which this class was compiled. May be null.public void visitInnerClass(java.lang.String name, java.lang.String outerName, java.lang.String innerName, int access)
visitInnerClass
in interface ClassVisitor
name
- the internal name of an inner class (see getInternalName
).outerName
- the internal name of the class to which the inner class belongs (see getInternalName
). May be null.innerName
- the (simple) name of the inner class inside its enclosing class. May be null for anonymous inner classes.access
- the access flags of the inner class as originally declared in the enclosing class.public void visitField(int access, java.lang.String name, java.lang.String desc, java.lang.Object value, Attribute attrs)
visitField
in interface ClassVisitor
access
- the field's access flags (see Constants
). This parameter also indicates if the field is synthetic and/or deprecated.name
- the field's name.desc
- the field's descriptor (see Type
).value
- the field's initial value. This parameter, which may be null if the field does not have an initial value, must be an Integer
, a Float
, a Long
, a Double
or a String
(for int, float, long or String fields respectively). This parameter is only used for static fields. Its value is ignored for non static fields, which must be initialized through bytecode instructions in constructors or methods.attrs
- the non standard method attributes, linked together by their next field. May be null.public CodeVisitor visitMethod(int access, java.lang.String name, java.lang.String desc, java.lang.String[] exceptions, Attribute attrs)
CodeVisitor
instance (or null) each time it is called, i.e., it should not return a previously returned visitor.visitMethod
in interface ClassVisitor
access
- the method's access flags (see Constants
). This parameter also indicates if the method is synthetic and/or deprecated.name
- the method's name.desc
- the method's descriptor (see Type
).exceptions
- the internal names of the method's exception classes (see getInternalName
). May be null.attrs
- the non standard method attributes, linked together by their next field. May be null.public void visitAttribute(Attribute attr)
visitAttribute
in interface ClassVisitor
attr
- a non standard class attribute. Must not be null.public void visitEnd()
visitEnd
in interface ClassVisitor
public byte[] toByteArray()
public int newConst(java.lang.Object cst)
Attribute
sub classes, and is normally not needed by class generators or adapters.cst
- the value of the constant to be added to the constant pool. This parameter must be an Integer
, a Float
, a Long
, a Double
or a String
.public int newConstInt(int i)
public int newConstLong(long l)
public int newConstFloat(float f)
public int newConstDouble(double d)
public int newUTF8(java.lang.String value)
Attribute
sub classes, and is normally not needed by class generators or adapters.value
- the String value.public int newClass(java.lang.String value)
Attribute
sub classes, and is normally not needed by class generators or adapters.value
- the internal name of the class.public int newField(java.lang.String owner, java.lang.String name, java.lang.String desc)
Attribute
sub classes, and is normally not needed by class generators or adapters.owner
- the internal name of the field's owner class.name
- the field's name.desc
- the field's descriptor.public int newMethod(java.lang.String owner, java.lang.String name, java.lang.String desc, boolean itf)
Attribute
sub classes, and is normally not needed by class generators or adapters.owner
- the internal name of the method's owner class.name
- the method's name.desc
- the method's descriptor.itf
- true if owner is an interface.public int newNameType(java.lang.String name, java.lang.String desc)
Attribute
sub classes, and is normally not needed by class generators or adapters.name
- a name.desc
- a type descriptor.
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