# Class StackMap

java.lang.Object
org.apache.bcel.classfile.Attribute
org.apache.bcel.classfile.StackMap

All Implemented Interfaces:
  `Cloneable, Node`

public final class StackMap extends Attribute
This class represents a stack map attribute used for preverification of Java classes for the Java 2 Micro Edition (J2ME). This attribute is used by the KVM and contained within the Code attribute of a method. See CLDC specification �5.3.1.2

    StackMapTable_attribute {
      u2              attribute_name_index;
      u4              attribute_length;
      u2              number_of_entries;
      stack_map_frame entries[number_of_entries];
    }

See Also:
  - `Code`
  - `StackMapEntry`
  - `StackMapType`

- ## Field Summary

  ### Fields inherited from class Attribute

  `constant_pool, EMPTY_ARRAY, length, name_index, tag`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `StackMap(int nameIndex, int length, StackMapEntry[] table, ConstantPool constantPool)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `accept(Visitor v)`
  Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
  `Attribute`
  `copy(ConstantPool constantPool)`
  `void`
  `dump(DataOutputStream file)`
  Dump stack map table attribute to file stream in binary format.
  `int`
  `getMapLength()`
  `StackMapEntry[]`
  `getStackMap()`
  `void`
  `setStackMap(StackMapEntry[] table)`
  `String`
  `toString()`

  ### Methods inherited from class Attribute

  `addAttributeReader, addAttributeReader, clone, getConstantPool, getLength, getName, getNameIndex, getTag, println, readAttribute, readAttribute, removeAttributeReader, setConstantPool, setLength, setNameIndex`

  ### Methods inherited from class Object

  `equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- ## Constructor Details

  - ### StackMap

    public StackMap(int nameIndex, int length, StackMapEntry[] table, ConstantPool constantPool)

- ## Method Details

  - ### accept

    public void accept(Visitor v)
    Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    Specified by:
      `accept` in interface `Node`
    Specified by:
      `accept` in class `Attribute`
    Parameters:
      `v` - Visitor object

  - ### copy

    public Attribute copy(ConstantPool constantPool)
    Specified by:
      `copy` in class `Attribute`
    Parameters:
      `constantPool` - constant pool to save.
    Returns:
      deep copy of this attribute

  - ### dump

    public void dump(DataOutputStream file) throws IOException
    Dump stack map table attribute to file stream in binary format.
    Overrides:
      `dump` in class `Attribute`
    Parameters:
      `file` - Output file stream
    Throws:
      `IOException` - if an I/O error occurs.

  - ### getMapLength

    public int getMapLength()

  - ### getStackMap

    public StackMapEntry[] getStackMap()
    Returns:
      Array of stack map entries

  - ### setStackMap

    public void setStackMap(StackMapEntry[] table)
    Parameters:
      `table` - Array of stack map entries

  - ### toString

    public String toString()
    Overrides:
      `toString` in class `Attribute`
    Returns:
      String representation.