ConstantPoolEntry (Apache Ant API)

java.lang.Object
- org.apache.tools.ant.taskdefs.optional.depend.constantpool.ConstantPoolEntry

Direct Known Subclasses:

ClassCPInfo, ConstantCPInfo, FieldRefCPInfo, InterfaceMethodRefCPInfo, MethodHandleCPInfo, MethodRefCPInfo, NameAndTypeCPInfo, Utf8CPInfo
```
public abstract class ConstantPoolEntry
extends java.lang.Object
```
An entry in the constant pool. This class contains a representation of the constant pool entries. It is an abstract base class for all the different forms of constant pool entry.

See Also:

ConstantPool

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`CONSTANT_CLASS` Tag value for Class entries.
`static int`	`CONSTANT_DOUBLE` Tag value for Double entries.
`static int`	`CONSTANT_FIELDREF` Tag value for Field Reference entries.
`static int`	`CONSTANT_FLOAT` Tag value for Float entries.
`static int`	`CONSTANT_INTEGER` Tag value for Integer entries.
`static int`	`CONSTANT_INTERFACEMETHODREF` Tag value for Interface Method Reference entries.
`static int`	`CONSTANT_INVOKEDYNAMIC` Tag value for InvokeDynamic entries
`static int`	`CONSTANT_LONG` Tag value for Long entries.
`static int`	`CONSTANT_METHODHANDLE` Tag value for Method Handle entries
`static int`	`CONSTANT_METHODREF` Tag value for Method Reference entries.
`static int`	`CONSTANT_METHODTYPE` Tag value for Method Type entries
`static int`	`CONSTANT_NAMEANDTYPE` Tag value for Name and Type entries.
`static int`	`CONSTANT_STRING` Tag value for String entries.
`static int`	`CONSTANT_UTF8` Tag value for UTF8 entries.

Constructor Summary

Constructors
Constructor and Description

ConstantPoolEntry(int tagValue, int entries)
Initialise the constant pool entry.

Constructors
Constructor and Description
`ConstantPoolEntry(int tagValue, int entries)` Initialise the constant pool entry.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`int`	`getNumEntries()` Get the number of Constant Pool Entry slots within the constant pool occupied by this entry.
`int`	`getTag()` Get the Entry's type tag.
`boolean`	`isResolved()` Indicates whether this entry has been resolved.
`abstract void`	`read(java.io.DataInputStream cpStream)` read a constant pool entry from a class stream.
`static ConstantPoolEntry`	`readEntry(java.io.DataInputStream cpStream)` Read a constant pool entry from a stream.
`void`	`resolve(ConstantPool constantPool)` Resolve this constant pool entry with respect to its dependents in the constant pool.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - CONSTANT_UTF8
```
public static final int CONSTANT_UTF8
```
    Tag value for UTF8 entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_INTEGER
```
public static final int CONSTANT_INTEGER
```
    Tag value for Integer entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_FLOAT
```
public static final int CONSTANT_FLOAT
```
    Tag value for Float entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_LONG
```
public static final int CONSTANT_LONG
```
    Tag value for Long entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_DOUBLE
```
public static final int CONSTANT_DOUBLE
```
    Tag value for Double entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_CLASS
```
public static final int CONSTANT_CLASS
```
    Tag value for Class entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_STRING
```
public static final int CONSTANT_STRING
```
    Tag value for String entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_FIELDREF
```
public static final int CONSTANT_FIELDREF
```
    Tag value for Field Reference entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_METHODREF
```
public static final int CONSTANT_METHODREF
```
    Tag value for Method Reference entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_INTERFACEMETHODREF
```
public static final int CONSTANT_INTERFACEMETHODREF
```
    Tag value for Interface Method Reference entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_NAMEANDTYPE
```
public static final int CONSTANT_NAMEANDTYPE
```
    Tag value for Name and Type entries.
    
    See Also:
    
    Constant Field Values
  - CONSTANT_METHODHANDLE
```
public static final int CONSTANT_METHODHANDLE
```
    Tag value for Method Handle entries
    
    See Also:
    
    Constant Field Values
  - CONSTANT_METHODTYPE
```
public static final int CONSTANT_METHODTYPE
```
    Tag value for Method Type entries
    
    See Also:
    
    Constant Field Values
  - CONSTANT_INVOKEDYNAMIC
```
public static final int CONSTANT_INVOKEDYNAMIC
```
    Tag value for InvokeDynamic entries
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - ConstantPoolEntry
```
public ConstantPoolEntry(int tagValue,
                         int entries)
```
    Initialise the constant pool entry.
    
    Parameters:
    
    tagValue - the tag value which identifies which type of constant pool entry this is.
    
    entries - the number of constant pool entry slots this entry occupies.
- Method Detail
  - readEntry
```
public static ConstantPoolEntry readEntry(java.io.DataInputStream cpStream)
                                   throws java.io.IOException
```
    Read a constant pool entry from a stream. This is a factory method which reads a constant pool entry form a stream and returns the appropriate subclass for the entry.
    
    Parameters:
    
    cpStream - the stream from which the constant pool entry is to be read.
    
    Returns:
    
    the appropriate ConstantPoolEntry subclass representing the constant pool entry from the stream.
    
    Throws:
    
    java.io.IOException - if the constant pool entry cannot be read from the stream
  - isResolved
```
public boolean isResolved()
```
    Indicates whether this entry has been resolved. In general a constant pool entry can reference another constant pool entry by its index value. Resolution involves replacing this index value with the constant pool entry at that index.
    
    Returns:
    
    true if this entry has been resolved.
  - resolve
```
public void resolve(ConstantPool constantPool)
```
    Resolve this constant pool entry with respect to its dependents in the constant pool.
    
    Parameters:
    
    constantPool - the constant pool of which this entry is a member and against which this entry is to be resolved.
  - read
```
public abstract void read(java.io.DataInputStream cpStream)
                   throws java.io.IOException
```
    read a constant pool entry from a class stream.
    
    Parameters:
    
    cpStream - the DataInputStream which contains the constant pool entry to be read.
    
    Throws:
    
    java.io.IOException - if there is a problem reading the entry from the stream.
  - getTag
```
public int getTag()
```
    Get the Entry's type tag.
    
    Returns:
    
    The Tag value of this entry
  - getNumEntries
```
public final int getNumEntries()
```
    Get the number of Constant Pool Entry slots within the constant pool occupied by this entry.
    
    Returns:
    
    the number of slots used.

Class ConstantPoolEntry

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

CONSTANT_UTF8

CONSTANT_INTEGER

CONSTANT_FLOAT

CONSTANT_LONG

CONSTANT_DOUBLE

CONSTANT_CLASS

CONSTANT_STRING

CONSTANT_FIELDREF

CONSTANT_METHODREF

CONSTANT_INTERFACEMETHODREF

CONSTANT_NAMEANDTYPE

CONSTANT_METHODHANDLE

CONSTANT_METHODTYPE

CONSTANT_INVOKEDYNAMIC

Constructor Detail

ConstantPoolEntry

Method Detail

readEntry

isResolved

resolve

read

getTag

getNumEntries