Constructor Detail

• ClassFileMetaData

  public ClassFileMetaData(byte[] byteCode)

Method Detail

• containsUtf8

  public boolean containsUtf8(String value)

  Checks if the constant pool contains the provided 'raw' string. These are used as source material for further JVM types, such as string constants, type references, etcetera.

• usesClass

  public boolean usesClass(String className)

  Checks if the constant pool contains a reference to the provided class. NB: Most uses of a type do NOT show up as a class in the constant pool. For example, the parameter types and return type of any method you invoke or declare, are stored as signatures and not as type references, but the type to which any method you invoke belongs, is. Read the JVM Specification for more information.

  Parameters:

  className - must be provided JVM-style, such as java/lang/String

• usesField

  public boolean usesField(String className,
                  String fieldName)

  Checks if the constant pool contains a reference to a given field, either for writing or reading.

  Parameters:

  className - must be provided JVM-style, such as java/lang/String

• usesMethod

  public boolean usesMethod(String className,
                   String methodName)

  Checks if the constant pool contains a reference to a given method, with any signature (return type and parameter types).

  Parameters:

  className - must be provided JVM-style, such as java/lang/String

• usesMethod

  public boolean usesMethod(String className,
                   String methodName,
                   String descriptor)

  Checks if the constant pool contains a reference to a given method.

  Parameters:

  className - must be provided JVM-style, such as java/lang/String

  descriptor - must be provided JVM-style, such as (IZ)Ljava/lang/String;

• containsStringConstant

  public boolean containsStringConstant(String value)

  Checks if the constant pool contains the provided string constant, which implies the constant is used somewhere in the code. NB: String literals get concatenated by the compiler. NB2: This method does NOT do any kind of normalization.

• containsLong

  public boolean containsLong(long value)

  Checks if the constant pool contains the provided long constant, which implies the constant is used somewhere in the code. NB: compile-time constant expressions are evaluated at compile time.

• containsDouble

  public boolean containsDouble(double value)

  Checks if the constant pool contains the provided double constant, which implies the constant is used somewhere in the code. NB: compile-time constant expressions are evaluated at compile time.

• containsInteger

  public boolean containsInteger(int value)

  Checks if the constant pool contains the provided int constant, which implies the constant is used somewhere in the code. NB: compile-time constant expressions are evaluated at compile time.

• containsFloat

  public boolean containsFloat(float value)

  Checks if the constant pool contains the provided float constant, which implies the constant is used somewhere in the code. NB: compile-time constant expressions are evaluated at compile time.

• getClassName

  public String getClassName()

  Returns the name of the class in JVM format, such as java/lang/String

• getSuperClassName

  public String getSuperClassName()

  Returns the name of the superclass in JVM format, such as java/lang/Object NB: If you try this on Object itself, you'll get null.
  NB2: For interfaces and annotation interfaces, you'll always get java/lang/Object

• getInterfaces

  public List<String> getInterfaces()

  Returns the name of all implemented interfaces.

• poolContent

  public String poolContent()

  A toString() like utility to dump all contents of the constant pool into a string. NB: No guarantees are made about the exact layout of this string. It is for informational purposes only, don't try to parse it.
  NB2: After a double or long, there's a JVM spec-mandated gap, which is listed as (cont.) in the returned string.