org.apache.jdo.impl.enhancer.classfile
Class Descriptor

java.lang.Object
  extended byorg.apache.jdo.impl.enhancer.classfile.Descriptor
All Implemented Interfaces:
VMConstants

public class Descriptor
extends java.lang.Object
implements VMConstants

A collection of static methods which manipulate type descriptors


Field Summary
 
Fields inherited from interface org.apache.jdo.impl.enhancer.classfile.VMConstants
ACCAbstract, ACCFinal, ACCInterface, ACCNative, ACCPrivate, ACCProtected, ACCPublic, ACCStatic, ACCSuper, ACCSynchronized, ACCTransient, ACCVolatile, CONSTANTClass, CONSTANTDouble, CONSTANTFieldRef, CONSTANTFloat, CONSTANTInteger, CONSTANTInterfaceMethodRef, CONSTANTLong, CONSTANTMethodRef, CONSTANTNameAndType, CONSTANTString, CONSTANTUnicode, CONSTANTUtf8, opc_aaload, opc_aastore, opc_aconst_null, opc_aload, opc_aload_0, opc_aload_1, opc_aload_2, opc_aload_3, opc_anewarray, opc_areturn, opc_arraylength, opc_astore, opc_astore_0, opc_astore_1, opc_astore_2, opc_astore_3, opc_athrow, opc_baload, opc_bastore, opc_bipush, opc_caload, opc_castore, opc_checkcast, opc_d2f, opc_d2i, opc_d2l, opc_dadd, opc_daload, opc_dastore, opc_dcmpg, opc_dcmpl, opc_dconst_0, opc_dconst_1, opc_ddiv, opc_dload, opc_dload_0, opc_dload_1, opc_dload_2, opc_dload_3, opc_dmul, opc_dneg, opc_drem, opc_dreturn, opc_dstore, opc_dstore_0, opc_dstore_1, opc_dstore_2, opc_dstore_3, opc_dsub, opc_dup, opc_dup_x1, opc_dup_x2, opc_dup2, opc_dup2_x1, opc_dup2_x2, opc_f2d, opc_f2i, opc_f2l, opc_fadd, opc_faload, opc_fastore, opc_fcmpg, opc_fcmpl, opc_fconst_0, opc_fconst_1, opc_fconst_2, opc_fdiv, opc_fload, opc_fload_0, opc_fload_1, opc_fload_2, opc_fload_3, opc_fmul, opc_fneg, opc_frem, opc_freturn, opc_fstore, opc_fstore_0, opc_fstore_1, opc_fstore_2, opc_fstore_3, opc_fsub, opc_getfield, opc_getstatic, opc_goto, opc_goto_w, opc_i2b, opc_i2c, opc_i2d, opc_i2f, opc_i2l, opc_i2s, opc_iadd, opc_iaload, opc_iand, opc_iastore, opc_iconst_0, opc_iconst_1, opc_iconst_2, opc_iconst_3, opc_iconst_4, opc_iconst_5, opc_iconst_m1, opc_idiv, opc_if_acmpeq, opc_if_acmpne, opc_if_icmpeq, opc_if_icmpge, opc_if_icmpgt, opc_if_icmple, opc_if_icmplt, opc_if_icmpne, opc_ifeq, opc_ifge, opc_ifgt, opc_ifle, opc_iflt, opc_ifne, opc_ifnonnull, opc_ifnull, opc_iinc, opc_iload, opc_iload_0, opc_iload_1, opc_iload_2, opc_iload_3, opc_imul, opc_ineg, opc_instanceof, opc_invokeinterface, opc_invokespecial, opc_invokestatic, opc_invokevirtual, opc_ior, opc_irem, opc_ireturn, opc_ishl, opc_ishr, opc_istore, opc_istore_0, opc_istore_1, opc_istore_2, opc_istore_3, opc_isub, opc_iushr, opc_ixor, opc_jsr, opc_jsr_w, opc_l2d, opc_l2f, opc_l2i, opc_ladd, opc_laload, opc_land, opc_lastore, opc_lcmp, opc_lconst_0, opc_lconst_1, opc_ldc, opc_ldc_w, opc_ldc2_w, opc_ldiv, opc_lload, opc_lload_0, opc_lload_1, opc_lload_2, opc_lload_3, opc_lmul, opc_lneg, opc_lookupswitch, opc_lor, opc_lrem, opc_lreturn, opc_lshl, opc_lshr, opc_lstore, opc_lstore_0, opc_lstore_1, opc_lstore_2, opc_lstore_3, opc_lsub, opc_lushr, opc_lxor, opc_monitorenter, opc_monitorexit, opc_multianewarray, opc_new, opc_newarray, opc_nop, opc_pop, opc_pop2, opc_putfield, opc_putstatic, opc_ret, opc_return, opc_saload, opc_sastore, opc_sipush, opc_swap, opc_tableswitch, opc_wide, opc_xxxunusedxxx, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, T_TWOWORD, T_UNKNOWN, T_WORD, TC_INTERFACE, TC_OBJECT, TC_STRING
 
Constructor Summary
Descriptor()
           
 
Method Summary
static void computeStackTypes(java.lang.String stackSig, java.util.Stack stack)
          stackSig is a signature for a list of types on the JVM stack with the last type in the signature intended to be on the top of JVM stack.
static int countFieldWords(java.lang.String sig)
          Return the number of words of a field based on its signature.
static int countMethodArgWords(java.lang.String sig)
          Return the number of words of arguments to the method based on the method signature
static int countMethodReturnWords(java.lang.String sig)
          Return the number of words of return value for the method based on the method signature
static java.lang.String elementSig(int valueType)
          Return the element type descriptor char for the element type.
static int elementSize(int elementType)
          Return the number of stack words required for a value of the specified type on the operand stack.
static int elementType(java.lang.String sig)
          Return the element type for the first char in the type descriptor string.
static java.lang.String extractArgSig(java.lang.String methodSig)
          Return the stack descriptor for the arguments to a method invocation (not including any "this" argument)
static java.lang.String extractResultSig(java.lang.String methodSig)
          Return the stack descriptor for the result of a method invocation.
static java.lang.String extractReversedArgSig(java.lang.String methodSig)
          Return the reversed stack descriptor for the arguments to a method invocation (not including any "this" argument).
static int nextSigElement(java.lang.String stackSig, int idx)
          stackSig is a signature for the types on the stack with the last type in the signature on the top of stack.
static java.lang.String remapTypes(java.lang.String sig, java.util.Map classTranslations)
          classTranslations contains a set of mappings of class names.
static java.lang.String translateClass(java.lang.String cls, java.util.Map classTranslations)
          classTranslations contains a set of mappings of class names.
static java.lang.String userFieldSig(java.lang.String vmSig)
          Translates a VM type field signature into a user-format signature.
static java.lang.String userFieldSig(java.lang.String vmSig, int idx)
          Translates a VM type field signature into a user-format signature.
static java.lang.String userMethodArgs(java.lang.String methodSig)
          Produce a user consumable representation of a method argument list from the method signature.
static java.lang.String userMethodResult(java.lang.String methodSig)
          Produce a user consumable representation of a method result type from the method signature.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Descriptor

public Descriptor()
Method Detail

countMethodArgWords

public static int countMethodArgWords(java.lang.String sig)
Return the number of words of arguments to the method based on the method signature


countMethodReturnWords

public static int countMethodReturnWords(java.lang.String sig)
Return the number of words of return value for the method based on the method signature


extractResultSig

public static java.lang.String extractResultSig(java.lang.String methodSig)
Return the stack descriptor for the result of a method invocation. Void return values yield "V".


extractArgSig

public static java.lang.String extractArgSig(java.lang.String methodSig)
Return the stack descriptor for the arguments to a method invocation (not including any "this" argument)


extractReversedArgSig

public static java.lang.String extractReversedArgSig(java.lang.String methodSig)
Return the reversed stack descriptor for the arguments to a method invocation (not including any "this" argument). The top of stack element will be first.


countFieldWords

public static int countFieldWords(java.lang.String sig)
Return the number of words of a field based on its signature.


elementType

public static int elementType(java.lang.String sig)
Return the element type for the first char in the type descriptor string.


elementSig

public static java.lang.String elementSig(int valueType)
Return the element type descriptor char for the element type. The element type must be one of the T_ or TC_OBJECT.


elementSize

public static int elementSize(int elementType)
Return the number of stack words required for a value of the specified type on the operand stack.


computeStackTypes

public static void computeStackTypes(java.lang.String stackSig,
                                     java.util.Stack stack)
stackSig is a signature for a list of types on the JVM stack with the last type in the signature intended to be on the top of JVM stack. For each type in the signature, pushes an Integer objects identifying the types on top of the input Stack object.


nextSigElement

public static int nextSigElement(java.lang.String stackSig,
                                 int idx)
stackSig is a signature for the types on the stack with the last type in the signature on the top of stack. idx is the index of the start of a valid signature type element. Return the index of the next element (which may be past the end of the string).


remapTypes

public static java.lang.String remapTypes(java.lang.String sig,
                                          java.util.Map classTranslations)
classTranslations contains a set of mappings of class names. For any types within the input signature which appear as keys in the translation table, change the signature to replace the original type with the translation. Return a string containing the original signature with any translations applied.


translateClass

public static java.lang.String translateClass(java.lang.String cls,
                                              java.util.Map classTranslations)
classTranslations contains a set of mappings of class names. Translate the class name (which may be an array class) according to the entries in the translation table. Return either the original string if no translation applies or else the translated string.


userFieldSig

public static java.lang.String userFieldSig(java.lang.String vmSig)
Translates a VM type field signature into a user-format signature. Just a front for the two argument overload of this method.


userFieldSig

public static java.lang.String userFieldSig(java.lang.String vmSig,
                                            int idx)
Translates a VM type field signature into a user-format signature.


userMethodArgs

public static java.lang.String userMethodArgs(java.lang.String methodSig)
Produce a user consumable representation of a method argument list from the method signature. The return value is ignored.


userMethodResult

public static java.lang.String userMethodResult(java.lang.String methodSig)
Produce a user consumable representation of a method result type from the method signature. The argument list is ignored.



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