CONSTANT_NameAndType_info.java

/* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved.
 * 
 * This program and the accompanying materials are made available under
 * the terms of the Common Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/cpl-v10.html
 * 
 * $Id: CONSTANT_NameAndType_info.java,v 1.1.1.1 2004/05/09 16:57:49 vlad_r Exp $
 */
package com.vladium.jcd.cls.constant;

import java.io.IOException;

import com.vladium.jcd.cls.ClassDef;
import com.vladium.jcd.lib.UDataInputStream;
import com.vladium.jcd.lib.UDataOutputStream;

// ----------------------------------------------------------------------------
/**
 * The CONSTANT_NameAndType_info structure is used to represent a field or method,
 * without indicating which class or interface type it belongs to.<P>
 * 
 * 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 representing a valid Java field name or method name stored as a simple
 * (not fully qualified) name, that is, as a Java identifier.<P>
 * 
 * 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 representing a valid Java field descriptor or method descriptor.
 * 
 * @author (C) 2001, Vlad Roubtsov
 */
public
final class CONSTANT_NameAndType_info extends CONSTANT_info
{
    // public: ................................................................

    public static final byte TAG = 12;
    
    
    public int m_name_index;
    public int m_descriptor_index;
    
    
    public CONSTANT_NameAndType_info (final int name_index, final int descriptor_index)
    {
        m_name_index = name_index;
        m_descriptor_index = descriptor_index;
    }
    
    public final byte tag ()
    {
        return TAG;
    }
    
    public String getName (final ClassDef cls)
    {
        return ((CONSTANT_Utf8_info) cls.getConstants ().get (m_name_index)).m_value;
    }
    
    public String getDescriptor (final ClassDef cls)
    {
        return ((CONSTANT_Utf8_info) cls.getConstants ().get (m_descriptor_index)).m_value;
    }
    
    // Visitor:
    
    public Object accept (final ICONSTANTVisitor visitor, final Object ctx)
    {
        return visitor.visit (this, ctx);
    }
     
    public String toString ()
    {
        return "CONSTANT_NameAndType: [name_index = " + m_name_index + ", descriptor_index = " + m_descriptor_index + ']';
    }
    
    // Cloneable: inherited clone() is Ok
    
    // IClassFormatOutput:
    
    public void writeInClassFormat (final UDataOutputStream out) throws IOException
    {
        super.writeInClassFormat (out);
        
        out.writeU2 (m_name_index);
        out.writeU2 (m_descriptor_index);
    }
    
    // protected: .............................................................

    
    protected CONSTANT_NameAndType_info (final UDataInputStream bytes) throws IOException
    {
        m_name_index = bytes.readU2 ();
        m_descriptor_index = bytes.readU2 ();
    }
    
    // package: ...............................................................

    // private: ...............................................................

} // end of class
// ----------------------------------------------------------------------------