gnu.bytecode
Class ClassType

java.lang.Object
  gnu.bytecode.Type
      gnu.bytecode.ObjectType
          gnu.bytecode.ClassType

All Implemented Interfaces:

AttrContainer, java.io.Externalizable, java.io.Serializable

Direct Known Subclasses:

PairClassType

public class ClassType
extends ObjectType
implements AttrContainer, java.io.Externalizable

See Also:

Serialized Form

Field Summary

int	access_flags
Method	constructor
static ClassType[]	noClasses

Fields inherited from class gnu.bytecode.ObjectType

flags

Fields inherited from class gnu.bytecode.Type

boolean_ctype, boolean_type, booleanValue_method, byte_type, char_type, clone_method, double_type, doubleValue_method, float_type, floatValue_method, int_type, intValue_method, java_lang_Class_type, long_type, longValue_method, neverReturnsType, nullType, number_type, pointer_type, reflectClass, short_type, string_type, throwable_type, toString_method, tostring_type, typeArray0, void_type

Constructor Summary

ClassType()

ClassType(java.lang.String class_name)

Method Summary

Field	addField() Add a new field to this class.
Field	addField(java.lang.String name) Add a new field to this class, and name the field.
Field	addField(java.lang.String name, Type type)
Field	addField(java.lang.String name, Type type, int flags)
void	addFields() Use reflection to add all the declared fields of this class.
void	addInterface(ClassType newInterface) Add an interface to the list of implemented interfaces.
Method	addMethod(java.lang.String name)
Method	addMethod(java.lang.String name, int flags)
Method	addMethod(java.lang.String name, int flags, Type[] arg_types, Type return_type) Add a method to this ClassType.
Method	addMethod(java.lang.String name, java.lang.String signature, int flags)
Method	addMethod(java.lang.String name, Type[] arg_types, Type return_type, int flags)
void	addMethods(java.lang.Class clas) Use reflection to add all the declared methods of this class.
void	cleanupAfterCompilation() Clear various object references, to help garbage collection.
int	compare(Type other) Return a numeric code showing "subtype" relationship: 1: if other is a pure subtype of this; 0: if has the same values; -1: if this is a pure subtype of other; -2: if they have values in common but neither is a subtype of the other; -3: if the types have no values in common.
int	countMethods(Filter filter, int searchSupers) Count methods matching a given filter.
void	doFixups() Do various fixups after generating code but before we can write it out.
Attribute	getAttributes() Get the (first) Attribute of this container.
short	getClassfileMajorVersion()
short	getClassfileMinorVersion()
CpoolEntry	getConstant(int i)
ConstantPool	getConstants()
Field	getDeclaredField(java.lang.String name) Find a field with the given name declared in this class.
Method	getDeclaredMethod(java.lang.String name, int argCount) Get a method with matching name and number of arguments.
Method	getDeclaredMethod(java.lang.String name, Type[] arg_types) Look for a matching method.
Method	getDeclaredMethods()
Field	getField(java.lang.String name) Find a field with the given name declared in this class or its ancestors.
Field	getField(java.lang.String name, int mask) Find a field with the given name declared in this class or its ancestors.
int	getFieldCount()
Field	getFields() Get the fields of this class.
ClassType[]	getInterfaces()
Method[]	getMatchingMethods(java.lang.String name, Type[] paramTypes, int flags)
Method	getMethod(java.lang.reflect.Method method) Add a method to this ClassType.
Method	getMethod(java.lang.String name, Type[] arg_types)
int	getMethodCount()
Method	getMethods() Get the methods of this class.
Method[]	getMethods(Filter filter, boolean searchSupers)
Method[]	getMethods(Filter filter, int searchSupers) Get methods matching a given filter.
int	getMethods(Filter filter, int searchSupers, Method[] result, int offset) Deprecated.
int	getMethods(Filter filter, int searchSupers, java.util.Vector result, java.lang.String context) Helper to get methods satisfying a filtering predicate.
int	getModifiers() Return the modifiers (access flags) for this class.
ClassType	getOuterLinkType()
java.lang.String	getPackageName()
ClassType	getSuperclass()
boolean	hasOuterLink()
boolean	implementsInterface(ClassType iface) True if this class/interface implements the interface iface.
boolean	isAccessible(ClassType declaring, int modifiers) Check if a component is accessible from this class.
boolean	isInterface()
boolean	isSubclass(ClassType other)
boolean	isSubclass(java.lang.String cname) A more efficient version of isSubclass(ClassType.make(cname)).
static ClassType	make(java.lang.String name) Find a ClassType with the given name, or create a new one.
static ClassType	make(java.lang.String name, ClassType superClass)
void	readExternal(java.io.ObjectInput in)
java.lang.Object	readResolve()
void	setAttributes(Attribute attributes) Set the (list of) Attributes of this container.
void	setClassfileVersion(int major, int minor)
void	setClassfileVersionJava5()
void	setInterface(boolean val)
void	setInterfaces(ClassType[] interfaces)
void	setModifiers(int flags) Set the modifiers (access flags) for this class.
void	setName(java.lang.String name) Sets the name of the class being defined in this classfile.
Field	setOuterLink(ClassType outer) Note that this class needs an other link ("this$0") field.
void	setSourceFile(java.lang.String name) Set the name of the SourceFile associated with this class.
void	setStratum(java.lang.String stratum) Create a SourceDebugExtAttr, if needed, and set the "stratum".
void	setSuper(ClassType superClass)
void	setSuper(java.lang.String name) Set the superclass of the is class.
static byte[]	to_utf8(java.lang.String str) Convert a String to a Utf8 byte array.
java.lang.String	toString()
void	writeExternal(java.io.ObjectOutput out)
byte[]	writeToArray()
void	writeToFile()
void	writeToFile(java.lang.String filename)
void	writeToStream(java.io.OutputStream stream)

Methods inherited from class gnu.bytecode.ObjectType

coerceFromObject, emitCoerceFromObject, getImplementationType, getInternalName, getReflectClass, isExisting, isInstance, promote, setExisting

Methods inherited from class gnu.bytecode.Type

coerceToObject, emitCoerceToObject, emitIsInstance, getName, getSignature, getSize, getSizeInWords, getType, hashCode, isMoreSpecific, isSubtype, isValidJavaTypeName, isVoid, lookupType, lowestCommonSuperType, make, registerTypeForClass, setReflectClass, setSignature, signatureLength, signatureLength, signatureToName, signatureToPrimitive, signatureToType, signatureToType, swappedCompareResult

Methods inherited from class java.lang.Object

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

Field Detail

access_flags

public int access_flags

noClasses

public static final ClassType[] noClasses

constructor

public Method constructor

Constructor Detail

ClassType

public ClassType()

ClassType

public ClassType(java.lang.String class_name)

Method Detail

getClassfileMajorVersion

public short getClassfileMajorVersion()

getClassfileMinorVersion

public short getClassfileMinorVersion()

setClassfileVersion

public void setClassfileVersion(int major,
                                int minor)

setClassfileVersionJava5

public void setClassfileVersionJava5()

make

public static ClassType make(java.lang.String name)

Find a ClassType with the given name, or create a new one. Use this for "library classes", where you need the field/method types, but not one where you are about to generate code for.

Parameters:

name - the name of the class (e..g. "java.lang.String").

make

public static ClassType make(java.lang.String name,
                             ClassType superClass)

getAttributes

public final Attribute getAttributes()

Description copied from interface: AttrContainer

Get the (first) Attribute of this container.

Specified by:

getAttributes in interface AttrContainer

setAttributes

public final void setAttributes(Attribute attributes)

Description copied from interface: AttrContainer

Set the (list of) Attributes of this container.

Specified by:

setAttributes in interface AttrContainer

getConstants

public final ConstantPool getConstants()

getConstant

public final CpoolEntry getConstant(int i)

getModifiers

public final int getModifiers()

Return the modifiers (access flags) for this class.

setModifiers

public final void setModifiers(int flags)

Set the modifiers (access flags) for this class.

hasOuterLink

public final boolean hasOuterLink()

getOuterLinkType

public ClassType getOuterLinkType()

setOuterLink

public final Field setOuterLink(ClassType outer)

Note that this class needs an other link ("this$0") field. This is only allowed if !isExisting(). Adjust any existing "" methods to take the extra implicit parameter.

Parameters:

outer - the outer class

isAccessible

public boolean isAccessible(ClassType declaring,
                            int modifiers)

Check if a component is accessible from this class.

Parameters:

declaring - the class containing the component (a field, method, or inner class)

modifiers - the access flags of the component

Returns:

true if the specified component can be accessed from this class.

setName

public void setName(java.lang.String name)

Sets the name of the class being defined in this classfile.

Overrides:

setName in class Type

Parameters:

name - the name to give to the class

setStratum

public void setStratum(java.lang.String stratum)

Create a SourceDebugExtAttr, if needed, and set the "stratum". The stratum is typically a programming language such as "JSP", "Scheme", or "Java" (the default).

setSourceFile

public void setSourceFile(java.lang.String name)

Set the name of the SourceFile associated with this class.

setSuper

public void setSuper(java.lang.String name)

Set the superclass of the is class.

Parameters:

name - name of super class, or null if this is "Object".

setSuper

public void setSuper(ClassType superClass)

getSuperclass

public ClassType getSuperclass()

getPackageName

public java.lang.String getPackageName()

getInterfaces

public ClassType[] getInterfaces()

Returns:

the interfaces this class is declared to implement (not those inherited from its superclass/superinterfaces).

setInterfaces

public void setInterfaces(ClassType[] interfaces)

addInterface

public void addInterface(ClassType newInterface)

Add an interface to the list of implemented interfaces.

isInterface

public final boolean isInterface()

setInterface

public final void setInterface(boolean val)

getFields

public final Field getFields()

Get the fields of this class.

getFieldCount

public final int getFieldCount()

getDeclaredField

public Field getDeclaredField(java.lang.String name)

Find a field with the given name declared in this class.

Returns:

the matching field, or null if there is no such field.

getField

public Field getField(java.lang.String name,
                      int mask)

Find a field with the given name declared in this class or its ancestors.

Parameters:

name - the name of the field.

mask - of match a field whose modifiers has one of these bits set. Howeve, if mask is -1, ignore the access flags.

Returns:

the matching field, or null if there is no such field.

getField

public Field getField(java.lang.String name)

Find a field with the given name declared in this class or its ancestors.

Returns:

the matching field, or null if there is no such field.

addField

public Field addField()

Add a new field to this class.

addField

public Field addField(java.lang.String name)

Add a new field to this class, and name the field.

Parameters:

name - the name of the new field

addField

public final Field addField(java.lang.String name,
                            Type type)

addField

public final Field addField(java.lang.String name,
                            Type type,
                            int flags)

addFields

public void addFields()

Use reflection to add all the declared fields of this class. Does not add private or package-private fields. Does not check for duplicate (already-known) fields. Is not thread-safe if another thread may access this ClassType.

getMethods

public final Method getMethods()

Get the methods of this class.

getMethodCount

public final int getMethodCount()

addMethod

public Method addMethod(java.lang.String name)

addMethod

public Method addMethod(java.lang.String name,
                        int flags)

addMethod

public Method addMethod(java.lang.String name,
                        Type[] arg_types,
                        Type return_type,
                        int flags)

addMethod

public Method addMethod(java.lang.String name,
                        int flags,
                        Type[] arg_types,
                        Type return_type)

Add a method to this ClassType. If an existing method matches, return that. Otherwise, create a new one. In contrast, the other addMethod methods always create new Methods.

addMethod

public Method addMethod(java.lang.String name,
                        java.lang.String signature,
                        int flags)

getMethod

public Method getMethod(java.lang.reflect.Method method)

Add a method to this ClassType. If an existing method matches, return that. Otherwise, create a new one.

getDeclaredMethods

public final Method getDeclaredMethods()

countMethods

public final int countMethods(Filter filter,
                              int searchSupers)

Count methods matching a given filter.

Parameters:

filter - to select methods to return

searchSupers - 0 if only current class should be searched, 1 if superclasses should also be searched, 2 if super-interfaces should also be search

Returns:

number of methods that match

getMethods

public Method[] getMethods(Filter filter,
                           boolean searchSupers)

getMethods

public Method[] getMethods(Filter filter,
                           int searchSupers)

Get methods matching a given filter.

Parameters:

filter - to select methods to return

searchSupers - 0 if only current class should be searched, 1 if superclasses should also be searched, 2 if super-interfaces should also be searched

Returns:

a fresh array containing the methods satisfying the filter

getMethods

public int getMethods(Filter filter,
                      int searchSupers,
                      Method[] result,
                      int offset)

Deprecated.

Helper to get methods satisfying a filtering predicate.

Parameters:

filter - to select methods to return

searchSupers - 0 if only current class should be searched, 1 if superclasses should also be searched, 2 if super-interfaces should also be searched

result - array to place selected methods in

offset - start of where in result to place result

Returns:

number of methods placed in result array

getMethods

public int getMethods(Filter filter,
                      int searchSupers,
                      java.util.Vector result,
                      java.lang.String context)

Helper to get methods satisfying a filtering predicate.

Overrides:

getMethods in class ObjectType

Parameters:

filter - to select methods to return

searchSupers - 0 if only current class should be searched, 1 if superclasses should also be searched, 2 if super-interfaces should also be searched

result - Vector to add selected methods in

context - If non-null, skip if class not visible in named package.

Returns:

number of methods placed in result array

getDeclaredMethod

public Method getDeclaredMethod(java.lang.String name,
                                Type[] arg_types)

Look for a matching method.

Parameters:

name - method name

arg_types - parameter types that must match. Can also be null, to match any parameter type list. Otherwise, an element of arg_types must be the same type (equals), though a null element of arg_types is a wildcard that matches any type.

getDeclaredMethod

public Method getDeclaredMethod(java.lang.String name,
                                int argCount)

Get a method with matching name and number of arguments.

getMethod

public Method getMethod(java.lang.String name,
                        Type[] arg_types)

addMethods

public void addMethods(java.lang.Class clas)

Use reflection to add all the declared methods of this class. Does not add constructors nor private or package-private methods. Does not check for duplicate (already-known) methods.

Parameters:

clas - should be the same as getReflectClass().

getMatchingMethods

public Method[] getMatchingMethods(java.lang.String name,
                                   Type[] paramTypes,
                                   int flags)

doFixups

public void doFixups()

Do various fixups after generating code but before we can write it out. This includes assigning constant pool indexes where needed, finalizing labels, etc.

writeToStream

public void writeToStream(java.io.OutputStream stream)
                   throws java.io.IOException

Throws:

java.io.IOException

writeToFile

public void writeToFile(java.lang.String filename)
                 throws java.io.IOException

Throws:

java.io.IOException

writeToFile

public void writeToFile()
                 throws java.io.IOException

Throws:

java.io.IOException

writeToArray

public byte[] writeToArray()

to_utf8

public static byte[] to_utf8(java.lang.String str)

Convert a String to a Utf8 byte array.

Parameters:

str - the input String.

Returns:

the input encoded as a utf8 byte array.

implementsInterface

public final boolean implementsInterface(ClassType iface)

True if this class/interface implements the interface iface.

isSubclass

public final boolean isSubclass(java.lang.String cname)

A more efficient version of isSubclass(ClassType.make(cname)). Does not cause the named class be loaded if it hasn't been.

Parameters:

cname - a class name - cannot be an interface name

isSubclass

public final boolean isSubclass(ClassType other)

compare

public int compare(Type other)

Description copied from class: Type

Return a numeric code showing "subtype" relationship: 1: if other is a pure subtype of this; 0: if has the same values; -1: if this is a pure subtype of other; -2: if they have values in common but neither is a subtype of the other; -3: if the types have no values in common. "Same member" is rather loose; by "A is a subtype of B" we mean that all instance of A can be "widened" to B. More formally, A.compare(B) returns: 1: all B values can be converted to A without a coercion failure (i.e. a ClassCastException or overflow or major loss of information), but not vice versa. 0: all A values can be converted to B without a coercion failure and vice versa; -1: all A values can be converted to B without a coercion failure not not vice versa; -2: there are (potentially) some A values that can be converted to B, and some B values can be converted to A; -3: there are no A values that can be converted to B, and neither are there any B values that can be converted to A.

Overrides:

compare in class ObjectType

toString

public java.lang.String toString()

Overrides:

toString in class Type

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Throws:

java.io.IOException

java.lang.ClassNotFoundException

readResolve

public java.lang.Object readResolve()
                             throws java.io.ObjectStreamException

Throws:

java.io.ObjectStreamException

cleanupAfterCompilation

public void cleanupAfterCompilation()

Clear various object references, to help garbage collection.