/*
 * Code.java
 *
 * Created on March 12, 1999
 *
 * Modification Log:
 * 1.00 12th Mar 1999 Tanmay Original version.
 * 1.01 12th Jun 1999 Tanmay Methods to verify and get text summary added.
 * 1.02 11th May 2002 TAnmay Made members public for use in view
 *-----------------------------------------------------------------------------------------
 * 10th Sep 2003 Tanmay Moved to SourceForge (http://classeditor.sourceforge.net)
 *-----------------------------------------------------------------------------------------
 * 1.03 28th Sep 2003 Tanmay Moved text summary method to visitor.
 */

package classfile.attributes;

import classfile.Utils;
import classfile.ConstantPoolInfo;
import classfile.ConstantPool;

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

/**
 * Class to go through the code array and return sCodeIndex + a string representation of
 * the code one instruction per call of method getNextInstruction.
 * <p>
 *
 * @author 	 Tanmay K. Mohapatra
 * @version 1.03, 28th Sep, 2003
 */

public class Code {
 public int iCodeLength;
 public int iCurrIndex;
 public int iCodeIndex;
 public Vector vectCode;
 
 void read(DataInputStream dis, ConstantPool constPool) throws IOException {
 iCodeLength = dis.readInt();
 
 vectCode = new Vector();
 
 for (int iIndex=0; iIndex < iCodeLength; ) {
 Instruction thisInstr = new Instruction();
 thisInstr.readInstruction(dis, constPool, iIndex);
 vectCode.addElement(thisInstr);
 iIndex += (thisInstr.iDataLength + 1);
 }
 iCurrIndex = 0;
 iCodeIndex = 0;
 }
 
 void write(DataOutputStream dos, ConstantPool constPool) throws IOException {
 dos.writeInt(iCodeLength);
 
 for (int iIndex=0; iIndex < vectCode.size(); iIndex++) {
 Instruction thisInstr = (Instruction) vectCode.elementAt(iIndex);
 thisInstr.writeInstruction(dos, constPool);
 }
 }
 
 public String getNextInstruction() {
 if (iCurrIndex >= vectCode.size()) {
 iCurrIndex = 0; // reset
 iCodeIndex = 0;
 return null;
 }
 
 Instruction thisInstr = (Instruction) vectCode.elementAt(iCurrIndex);
 iCurrIndex++;
 iCodeIndex += (thisInstr.iDataLength+1);
 return Integer.toString(iCodeIndex-thisInstr.iDataLength-1) + " " + thisInstr.toString();
 }
 
 public boolean verify(String sPrepend, Vector vectVerifyErrors) {
 return true; // not implemented yet because code cannot be changed
 }
 
 public int getCodeLength() {
 return iCodeLength;
 }
}