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Class espresso.classfile.javaclass.ConstantPool 

java.lang.Object
   |
   +----espresso.classfile.javaclass.ConstantPool
public final class ConstantPool
extends Object
implements Constants
This class represents the constant pool, i.e. a table of constants. It may contain null references, due to the JVM specification that skips an entry after an 8-byte constant (double, long) entry.

See Also:
Constant

Variable Index

o constant_pool
o constant_pool_count

Constructor Index

o ConstantPool(Constant[])
o ConstantPool(DataInputStream)
Read constants from given file stream.

Method Index

o accept(Visitor)
Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class.
o constantToString(Constant)
Resolve constant to a string representation.
o constantToString(int, byte)
Retrieve constant at `index' from constant pool and resolve it to a string representation.
o dump(DataOutputStream)
Dump constant pool to file stream in binary format.
o getConstant(int)
Get constant from constant pool.
o getConstant(int, byte)
Get constant from constant pool and check whether it has the expected type.
o getConstantPool()
o getConstantString(int, byte)
Get string from constant pool and bypass the indirection of `ConstantClass' and `ConstantString' objects.
o getLength()
o readConstant(DataInputStream)
Read one constant from the given file, the type depends on a tag byte.
o setConstant(int, Constant)
o setConstantPool(Constant[])
o toString()

Variables

o constant_pool_count 
 private int constant_pool_count
o constant_pool 
 private Constant constant_pool[]

Constructors

o ConstantPool 
 public ConstantPool(Constant constant_pool[])
Parameters:
constant_pool - Array of constants
o ConstantPool 
 ConstantPool(DataInputStream file) throws IOException, ClassFormatError
Read constants from given file stream.

Parameters:
file - Input stream

Methods

o accept 
 public void accept(Visitor v)
Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class. I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.

Parameters:
v - Visitor object
o constantToString 
 public String constantToString(Constant c) throws ClassFormatError
Resolve constant to a string representation.

Parameters:
constant - Constant to be printed
Returns:
String representation
o constantToString 
 public String constantToString(int index,
                                byte tag) throws ClassFormatError
Retrieve constant at `index' from constant pool and resolve it to a string representation.

Parameters:
index - of constant in constant pool
tag - expected type
Returns:
String representation
o dump 
 public void dump(DataOutputStream file) throws IOException
Dump constant pool to file stream in binary format.

Parameters:
file - Output file stream
o getConstant 
 public final Constant getConstant(int index)
Get constant from constant pool.

Parameters:
index - Index in constant pool
Returns:
Constant value
See Also:
Constant
o getConstant 
 public final Constant getConstant(int index,
                                   byte tag) throws ClassFormatError
Get constant from constant pool and check whether it has the expected type.

Parameters:
index - Index in constant pool
tag - Tag of expected constant, i.e. its type
Returns:
Constant value
See Also:
Constant
o getConstantPool 
 public final Constant[] getConstantPool()
Returns:
Array of constants.
See Also:
Constant
o getConstantString 
 public final String getConstantString(int index,
                                       byte tag) throws ClassFormatError
Get string from constant pool and bypass the indirection of `ConstantClass' and `ConstantString' objects. I.e. these classes have an index field that points to another entry of the constant pool of type `ConstantUtf8' which contains the real data.

Parameters:
index - Index in constant pool
tag - Tag of expected constant, either ConstantClass or ConstantString
Returns:
Contents of string reference
See Also:
ConstantClass, ConstantString
o getLength 
 public final int getLength()
Returns:
Length of constant pool.
o readConstant 
 private final Constant readConstant(DataInputStream file) throws IOException, ClassFormatError
Read one constant from the given file, the type depends on a tag byte.

Parameters:
file - Input stream
Returns:
Constant object
o setConstant 
 public final void setConstant(int index,
                               Constant constant)
Parameters:
constant - Constant to set
o setConstantPool 
 public final void setConstantPool(Constant constant_pool[])
o toString 
 public final String toString()
Returns:
String representation.
Overrides:
toString in class Object 
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