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jreversepro.common
Class Helper  

java.lang.Object
  jreversepro.common.Helper

All Implemented Interfaces:

KeyWords

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public class Helper

extends java.lang.Object

implements KeyWords

Helper contains a list of assorted methods that 'helps' in manipulating the data present in the class file.

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Field Summary
(package private) static boolean	debugFlag           Debug flag Default value = false.
(package private) static java.lang.String	DEFAULT_VERSION           Working Version Could be compromised

 

Fields inherited from interface jreversepro.common.KeyWords

ANY, BOOLEAN, BREAK, BYTE, CASE, CHAR, CLASS, CLASS_STRING, CLINIT, CLOSE_BRACKET, COND_AND, COND_NOT, COND_OR, CONTINUE, DEFAULT, DEFAULT_PACKAGE, DOUBLE, EQUALTO, FALSE, FLOAT, FOREIGN_CLASS, FOREIGN_OBJ, GOTO, INIT, INSTANCEOF, INT, INTERFACE, JVM_BOOLEAN, JVM_CHAR, JVM_VOID, LANG_OBJECT, LENGTH, LONG, NEW, NULL, OPEN_BRACKET, OPR_EQ, OPR_GE, OPR_GT, OPR_LE, OPR_LT, OPR_NE, OPR_NOT, REFERENCE, RET_ADDR, RETURN, SHORT, SPACE, STATIC, SUPER, SWITCH, THIS, THISCLASS, THROW, TRUE, VOID

 

Constructor Summary
private	Helper()           Private constructor to prevent any instance from being created.

 

Method Summary
static java.util.List	getArguments(java.lang.String aSignature)           Returns the arguments in array form given the JVM signature.
private static java.lang.String	getAtomicValue(java.lang.String value, java.lang.String datatype)           Both boolean and char are represented as integers .
static java.lang.String	getJavaDataType(java.lang.String aDataType, boolean associated)           Determines the Java representation , given the JVM representation of data types.
static java.lang.String	getPackageName(java.lang.String aFullName)           Returns the Package name alone from a fully qualified name.
static java.lang.String	getReturnType(java.lang.String aSignature)           Given the Signature of the method , this provides us the return type.
static int	getSignTokenLength(java.lang.String aDataType)           Determines the length of the JVM datatype representation given the JVM signature.
static java.lang.String	getValue(java.lang.String value, java.lang.String datatype)           Both boolean and char are represented as integers .
static boolean	isBasicType(java.lang.String type)           Checks if the given datatype is a basic data type or not.
static boolean	isDebug()
static void	log(java.lang.Exception ex)
static void	log(java.lang.String logMsg)
static void	logNoEol(java.lang.String logMsg)           Log without end-of-line at the end.
static java.lang.String	lowNbits(java.lang.String aValue, int aNumBits)           Extracts the value of a particular number of bits.
static java.lang.String	replaceEscapeChars(java.lang.String aLiteral)           Inserts a '\' before all the escape characters , line '\n' , '\t' to provide better readability.
private static java.lang.String	representChar(char aChar)           Returns the String representation of the character .
static int	signedToUnsigned(int aByteVal)           Converts a signed 'byte' to an unsigned integer.
static boolean	toggleDebug()           Toggles the debug flag.
static boolean	versionCheck()           Checks for the version compatibility between the system JRE and the JRE for which the application is written for.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

DEFAULT_VERSION

static final java.lang.String DEFAULT_VERSION

Working Version Could be compromised

See Also:

Constant Field Values

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debugFlag

static boolean debugFlag

Debug flag Default value = false.

Constructor Detail

Helper

private Helper()

Private constructor to prevent any instance from being created.

Method Detail

log

public static void log(java.lang.String logMsg)

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log

public static void log(java.lang.Exception ex)

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logNoEol

public static void logNoEol(java.lang.String logMsg)

Log without end-of-line at the end.

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toggleDebug

public static boolean toggleDebug()

Toggles the debug flag.

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isDebug

public static boolean isDebug()

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getPackageName

public static java.lang.String getPackageName(java.lang.String aFullName)

Returns the Package name alone from a fully qualified name.

For Example , if FullName = java/lang/StringBuffer,
then a call to getPackageName(arg) returns the value java.lang.

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getJavaDataType

public static java.lang.String getJavaDataType(java.lang.String aDataType,
                                               boolean associated)

Determines the Java representation , given the JVM representation of data types.

dataType	formatDataType(dataType)
B	byte
C	char
D	double
F	float
I	int
J	long
S	short
V	void
Z	boolean
[Z	boolean [] , array representation
Ljava/lang/String	java/lang/String

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getSignTokenLength

public static int getSignTokenLength(java.lang.String aDataType)

Determines the length of the JVM datatype representation given the JVM signature.

dataType	getSignTokenLength(dataType)(dataType)
all basic data types	1
[XYZ	len(XYZ) + 1
Ljava/lang/String	len(Ljava/lang/String)

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getArguments

public static java.util.List getArguments(java.lang.String aSignature)

Returns the arguments in array form given the JVM signature.

For example , IILjava/lang/String could be returned as
( int , int , java/lang/String ).

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getReturnType

public static java.lang.String getReturnType(java.lang.String aSignature)

Given the Signature of the method , this provides us the return type.

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lowNbits

public static java.lang.String lowNbits(java.lang.String aValue,
                                        int aNumBits)

Extracts the value of a particular number of bits.

For example lowNBits(169 , 5 ) returns (10101001,5) -> 10101 i.e 21
.

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replaceEscapeChars

public static java.lang.String replaceEscapeChars(java.lang.String aLiteral)

Inserts a '\' before all the escape characters , line '\n' , '\t' to provide better readability.

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representChar

private static java.lang.String representChar(char aChar)

Returns the String representation of the character .

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versionCheck

public static boolean versionCheck()

Checks for the version compatibility between the system JRE and the JRE for which the application is written for.

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isBasicType

public static boolean isBasicType(java.lang.String type)

Checks if the given datatype is a basic data type or not.

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getValue

public static java.lang.String getValue(java.lang.String value,
                                        java.lang.String datatype)

Both boolean and char are represented as integers . This takes care of the conversions

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getAtomicValue

private static java.lang.String getAtomicValue(java.lang.String value,
                                               java.lang.String datatype)

Both boolean and char are represented as integers . This takes care of the conversions

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signedToUnsigned

public static int signedToUnsigned(int aByteVal)

Converts a signed 'byte' to an unsigned integer.

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