Class BCIRenumberedAttribute

java.lang.Object
org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry
org.apache.commons.compress.harmony.unpack200.bytecode.Attribute
org.apache.commons.compress.harmony.unpack200.bytecode.BCIRenumberedAttribute
Direct Known Subclasses:
CodeAttribute, LineNumberTableAttribute, LocalVariableTableAttribute, LocalVariableTypeTableAttribute, NewAttribute
public abstract class BCIRenumberedAttribute extends Attribute
Abstract superclass for attributes that have some part encoded with Byte Code Injection (BCI) renumbering.

  • Field Details

    • renumbered

      protected boolean renumbered
      Whether renumbering has occurred.

  • Constructor Details

    • BCIRenumberedAttribute

      public BCIRenumberedAttribute(CPUTF8 attributeName)
      Constructs a new instance for an attribute name.
      Parameters:
      attributeName - an attribute name.

  • Method Details

    • getLength

      protected abstract int getLength()
      Description copied from class: Attribute
      Gets the length.
      Specified by:
      getLength in class Attribute
      Returns:
      the length.

    • getStartPCs

      protected abstract int[] getStartPCs()
      Gets the array of indices for the start of line numbers.
      Returns:
      the array of indices for the start of line numbers.

    • hasBCIRenumbering

      public boolean hasBCIRenumbering()
      Description copied from class: Attribute
      Answer true if the receiver needs to have BCI renumbering applied to it; otherwise answer false.
      Overrides:
      hasBCIRenumbering in class Attribute
      Returns:
      boolean BCI renumbering required

    • renumber

      public void renumber(List<Integer> byteCodeOffsets) throws Pack200Exception
      In Pack200, line number tables are BCI renumbered. This method takes the byteCodeOffsets (which is a List of Integers specifying the offset in the byte code array of each instruction) and updates the start_pcs so that it points to the instruction index itself, not the BCI renumbering of the instruction.
      Parameters:
      byteCodeOffsets - List of Integer offsets of the byte code array.
      Throws:
      Pack200Exception - Thrown from a subclass.

    • toString

      public abstract String toString()
      Specified by:
      toString in class ClassFileEntry

    • writeBody

      protected abstract void writeBody(DataOutputStream dos) throws IOException
      Description copied from class: Attribute
      Writes this body to the given output stream.
      Specified by:
      writeBody in class Attribute
      Parameters:
      dos - the output stream.
      Throws:
      IOException - if an I/O error occurs.