/*
 *    UninterpretedAttribute.java    1.7    03/01/14
 *
 * Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package components;
import java.io.DataOutput;
import java.io.DataInput;
import java.io.IOException;
import util.*;

/*
 * A class to represent the general Attribute form
 * in its most uninterpreted form. "data" is just an
 * array of byte. It can also be other things, even
 * array of ConstantObject.
 */

public
class UninterpretedAttribute extends Attribute
{
    public byte        data[];

    public
    UninterpretedAttribute( UnicodeConstant name, int l, byte d[] ){
    super( name, l );
    data = d;
    }

    protected int
    writeData( DataOutput o ) throws IOException{
    int trueLength = 0;
    o.write( data, 0, data.length );
    return data.length;
    }

    /*
     * For manipulating byte data 
     */
    public int getInt( int w ){
    return    (  (int)data[w]   << 24 ) |
        (( (int)data[w+1] &0xff ) << 16 ) |
        (( (int)data[w+2] &0xff ) << 8 ) |
         ( (int)data[w+3] &0xff );
    }

    public int getUnsignedShort( int w ){
    return    (( (int)data[w] &0xff ) << 8 ) | ( (int)data[w+1] &0xff );
    }

    private void putShort( int w, short v ){
    data[w]   = (byte)(v>>>8);
    data[w+1] = (byte)v;
    }

    public static UninterpretedAttribute
    readAttribute( DataInput i, ConstantObject globals[] ) throws IOException{
    UnicodeConstant name;
    int l;
    byte d[];

    name = (UnicodeConstant)globals[i.readUnsignedShort()];
    l  = i.readInt();
    d = new byte[ l ];
    i.readFully( d );
    return new UninterpretedAttribute( name, l, d );
    }

    //
    // for those cases where we already read the name index
    // and know that its not something requiring special handling.
    //
    public static Attribute
    finishReadAttribute( DataInput i, UnicodeConstant name ) throws IOException {
    int l;
    byte d[];

    l  = i.readInt();
    d = new byte[ l ];
    i.readFully( d );
    return new UninterpretedAttribute( name, l, d );
    }

    public static Attribute[] 
    readAttributes( DataInput i, ConstantObject t[], boolean verbose ) throws IOException {
    int nattr =  i.readUnsignedShort();
    if ( verbose ){
        System.out.println(Localizer.getString("uninterpretedattribute.reading_attributes", Integer.toString(nattr)));
    }
    if ( nattr == 0 ) return null;
    Attribute a[] = new Attribute[nattr];
    for ( int j = 0; j < nattr; j++ ){
        a[j] = readAttribute( i, t );
    }
    return a;
    }

}