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Field_info.javaAPI DocAndroid 1.5 API6170Wed May 06 22:41:16 BST 2009com.vladium.jcd.cls

Field_info

public final class Field_info extends Object implements Cloneable, IAccessFlags
Each class field is described by a variable-length field_info structure. The format of this structure is 
field_info {
u2 access_flags;
u2 name_index;
u2 descriptor_index;
u2 attributes_count;
attribute_info attributes[attributes_count];
}
The value of the access_flags item is a mask of modifiers used to describe access permission to and properties of a field.

The value of the name_index item must be a valid index into the constant pool table. The constant pool entry at that index must be a {@link CONSTANT_Utf8_info} structure which must represent a valid Java field name stored as a simple (not fully qualified) name, that is, as a Java identifier.

The value of the descriptor_index item must be a valid index into the constant pool table. The constant pool entry at that index must be a {@link CONSTANT_Utf8_info} structure which must represent a valid Java field descriptor.

Each value of the attributes table must be a variable-length attribute structure. A field can have any number of attributes associated with it. The only attribute defined for the attributes table of a field_info structure at the moment is the ConstantValue attribute -- see {@link ConstantValueAttribute_info}.

author
(C) 2001, Vlad Roubtsov

Fields Summary
public int
m_name_index
public int
m_descriptor_index
private int
m_access_flags
private IAttributeCollection
m_attributes
private static final boolean
DEBUG
Constructors Summary
public Field_info(int access_flags, int name_index, int descriptor_index, IAttributeCollection attributes)

        m_access_flags = access_flags;
        
        m_name_index = name_index;
        m_descriptor_index = descriptor_index;
        
        m_attributes = attributes;
public Field_info(IConstantCollection constants, com.vladium.jcd.lib.UDataInputStream bytes)

        m_access_flags = bytes.readU2 ();
        
        m_name_index = bytes.readU2 ();
        m_descriptor_index = bytes.readU2 ();
        
        // TODO: put this logic into AttributeCollection
        final int attributes_count = bytes.readU2 ();
        m_attributes = ElementFactory.newAttributeCollection (attributes_count);
        
        for (int i = 0; i < attributes_count; i++)
        {
            final Attribute_info attribute_info = Attribute_info.new_Attribute_info (constants, bytes);
            if (DEBUG) System.out.println ("\t[" + i + "] attribute: " + attribute_info);
            
            m_attributes.add (attribute_info);
        }
Methods Summary
public java.lang.Objectclone()
Performs a deep copy.

        try
        {
            final Field_info _clone = (Field_info) super.clone ();
            
            // do deep copy:
            _clone.m_attributes = (IAttributeCollection) m_attributes.clone ();
            
            return _clone;
        }
        catch (CloneNotSupportedException e)
        {
            throw new InternalError (e.toString ());
        }
public final intgetAccessFlags()

        return m_access_flags;
public IAttributeCollectiongetAttributes()

        return m_attributes;
public java.lang.StringgetDescriptor(ClassDef cls)
Returns the descriptor string for this field within the context of 'cls' class definition.

param
cls class that contains this field
return
field typename descriptor

        return ((CONSTANT_Utf8_info) cls.getConstants ().get (m_descriptor_index)).m_value;
public java.lang.StringgetName(ClassDef cls)
Returns the field name within the context of 'cls' class definition.

param
cls class that contains this field
return
field name

        return ((CONSTANT_Utf8_info) cls.getConstants ().get (m_name_index)).m_value;
public booleanisSynthetic()

        return m_attributes.hasSynthetic ();
public final voidsetAccessFlags(int flags)

        m_access_flags = flags;
public java.lang.StringtoString()

        return "field_info: [modifiers: 0x" + Integer.toHexString(m_access_flags) + ", name_index = " + m_name_index + ", descriptor_index = " + m_descriptor_index + ']";
public voidwriteInClassFormat(com.vladium.jcd.lib.UDataOutputStream out)

    
        out.writeU2 (m_access_flags);
        
        out.writeU2 (m_name_index);
        out.writeU2 (m_descriptor_index);
        
        m_attributes.writeInClassFormat (out);