constantvalueattribute.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 80 行

/*
 * @(#)ConstantValueAttribute.java	1.10 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.  
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
 *   
 * This program is free software; you can redistribute it and/or  
 * modify it under the terms of the GNU General Public License version  
 * 2 only, as published by the Free Software Foundation.   
 *   
 * This program is distributed in the hope that it will be useful, but  
 * WITHOUT ANY WARRANTY; without even the implied warranty of  
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
 * General Public License version 2 for more details (a copy is  
 * included at /legal/license.txt).   
 *   
 * You should have received a copy of the GNU General Public License  
 * version 2 along with this work; if not, write to the Free Software  
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
 * 02110-1301 USA   
 *   
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
 * Clara, CA 95054 or visit www.sun.com if you need additional  
 * information or have any questions. 
 *
 */

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

/*
 * A class to represent the ConstantValue Attribute
 * of a field
 */

public
class ConstantValueAttribute extends Attribute
{
    public ConstantObject	data;

    public
    ConstantValueAttribute( UnicodeConstant name, int l, ConstantObject d ){
	super( name, l );
	data = d;
    }

    protected int
    writeData( DataOutput o ) throws IOException{
	o.writeShort( data.index );
	return 2;
    }

    public void
    countConstantReferences( boolean isRelocatable ){
	super.countConstantReferences( isRelocatable );
	// don't need in runtime constant pool.
	//data.incReference();
    }

    //
    // 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, ConstantPool cp ) throws IOException {
	int l;
	int n;
	ConstantObject d;

	l  = i.readInt();
	n  = i.readUnsignedShort();
	d  = cp.elementAt(n);
	return new ConstantValueAttribute( name, l, d );
    }

}