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/*******************************************************************************
* Copyright (c) 2014 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
*
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.bytecode.accessors;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import cuchaz.enigma.bytecode.InfoType;
public class ConstInfoAccessor
{
private static Class<?> m_class;
private static Field m_index;
private static Method m_getTag;
static
{
try
{
m_class = Class.forName( "javassist.bytecode.ConstInfo" );
m_index = m_class.getDeclaredField( "index" );
m_index.setAccessible( true );
m_getTag = m_class.getMethod( "getTag" );
m_getTag.setAccessible( true );
}
catch( Exception ex )
{
throw new Error( ex );
}
}
private Object m_item;
public ConstInfoAccessor( Object item )
{
if( item == null )
{
throw new IllegalArgumentException( "item cannot be null!" );
}
m_item = item;
}
public ConstInfoAccessor( DataInputStream in )
throws IOException
{
try
{
// read the entry
String className = in.readUTF();
int oldIndex = in.readInt();
// NOTE: ConstInfo instances write a type id (a "tag"), but they don't read it back
// so we have to read it here
in.readByte();
Constructor<?> constructor = Class.forName( className ).getConstructor( DataInputStream.class, int.class );
constructor.setAccessible( true );
m_item = constructor.newInstance( in, oldIndex );
}
catch( IOException ex )
{
throw ex;
}
catch( Exception ex )
{
throw new Error( ex );
}
}
public Object getItem( )
{
return m_item;
}
public int getIndex( )
{
try
{
return (Integer)m_index.get( m_item );
}
catch( Exception ex )
{
throw new Error( ex );
}
}
public void setIndex( int val )
{
try
{
m_index.set( m_item, val );
}
catch( Exception ex )
{
throw new Error( ex );
}
}
public int getTag( )
{
try
{
return (Integer)m_getTag.invoke( m_item );
}
catch( Exception ex )
{
throw new Error( ex );
}
}
public ConstInfoAccessor copy( )
{
return new ConstInfoAccessor( copyItem() );
}
public Object copyItem( )
{
// I don't know of a simpler way to copy one of these silly things...
try
{
// serialize the item
ByteArrayOutputStream buf = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream( buf );
write( out );
// deserialize the item
DataInputStream in = new DataInputStream( new ByteArrayInputStream( buf.toByteArray() ) );
Object item = new ConstInfoAccessor( in ).getItem();
in.close();
return item;
}
catch( Exception ex )
{
throw new Error( ex );
}
}
public void write( DataOutputStream out )
throws IOException
{
try
{
out.writeUTF( m_item.getClass().getName() );
out.writeInt( getIndex() );
Method method = m_item.getClass().getMethod( "write", DataOutputStream.class );
method.setAccessible( true );
method.invoke( m_item, out );
}
catch( IOException ex )
{
throw ex;
}
catch( Exception ex )
{
throw new Error( ex );
}
}
@Override
public String toString( )
{
try
{
ByteArrayOutputStream buf = new ByteArrayOutputStream();
PrintWriter out = new PrintWriter( buf );
Method print = m_item.getClass().getMethod( "print", PrintWriter.class );
print.setAccessible( true );
print.invoke( m_item, out );
out.close();
return buf.toString().replace( "\n", "" );
}
catch( Exception ex )
{
throw new Error( ex );
}
}
public InfoType getType( )
{
return InfoType.getByTag( getTag() );
}
}
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