/*
 * Created on Feb 25, 2005
 */
package org.apache.bcel.classfile;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Vector;

import org.apache.bcel.Constants;

/**
 * @author yann
 */
public class FreshAttribute extends Attribute {

	static final long serialVersionUID = 0;
	
	public static final int cellSize = 3;
	
	private short[][] offsets;
	
	public FreshAttribute(int name_index, int length, short[][] offsets, ConstantPool cp) {
		super(Constants.ATTR_FRESH_MAP,name_index,length,cp);
		this.offsets = offsets; 
	}
	
	public FreshAttribute(int name_index, int length, DataInputStream str, ConstantPool cp)
		throws IOException {
	    this(name_index, length, (short [][])null, cp);

	    int nb = (length / cellSize);
	    if(nb > 0) {
	        Vector<Vector<Short>> vectors = new Vector<Vector<Short>>();
	        
	        short offset;
	        byte type;
	        
	        for(int i = 0; i < nb; i++) {
	            offset = str.readShort();
	            type = str.readByte();
	            
	            while(type >= vectors.size()) {
	            	vectors.add(new Vector<Short>());
	            }
	            vectors.elementAt(type).add(new Short(offset));
	        }

	        offsets = new short[vectors.size()][];
	        for(int i = 0; i < vectors.size(); i++) {
	            offsets[i] = new short[vectors.elementAt(i).size()];
	            for(int j = 0; j < vectors.elementAt(i).size(); j++) {
	                offsets[i][j] = vectors.elementAt(i).elementAt(j).shortValue();
	            }
	        }
	    }
	}
	
	public void accept(Visitor v) {
	    v.visitFreshMap(this);
	}

	public Attribute copy(ConstantPool cp) {
		FreshAttribute copy = (FreshAttribute)clone();
		System.arraycopy(offsets,0,copy.offsets,0,offsets.length);
		return copy;
	}

	public final void dump(DataOutputStream file) throws IOException {
		super.dump(file);
		// FIXME: sort the output ?
		for(int i = 0; i < offsets.length; i++) {
		    for(int j = 0; j < offsets[i].length; j++) {
				file.writeShort(offsets[i][j]);
				file.writeByte(i%2);
		    }
		}
	}
	
	public short[][] getOffsets() {
		return offsets;
	}

	public final String toString() {
	    StringBuffer buf = new StringBuffer("FreshMap(");
	    
	    for(int i=0; i < offsets.length; i++) {
	    	buf.append("[ ");
	    	for(int j = 0; j < offsets[i].length; j++) {
	    		buf.append("" + offsets[i][j] + " ");
	    	}
	    	buf.append("]");
	        
	        if(i < offsets.length - 1)
	            buf.append(", ");
	    }

	    buf.append(')');
	 	
	    return buf.toString();    
	}

}