/*
 * LocalVariableTableAttribute.java
 *
 * Created on March 12, 1999
 *
 * Modification Log:
 * 1.00 02nd Jun 1999 Tanmay Original Version
 * 1.01 12th Jun 1999 Tanmay Methods to verify and get text summary added.
 * 1.02 20th Jan 2002 Tanmay Implemented Attribute interface
 * 1.03 11th Feb 2002 Tanmay Used vector for storing local variables instead
 * of difficult to manipulate arrays.
 * 1.04 16th Mar 2002 Tanmay New methods for adding and deleting entries.
 *-----------------------------------------------------------------------------------------
 * 10th Sep 2003 Tanmay Moved to SourceForge (http://classeditor.sourceforge.net)
 *-----------------------------------------------------------------------------------------
 * 1.05 28th Sep 2003 Tanmay Moved text summary method to visitor.
 *
 */

package classfile.attributes;

import classfile.Utils;
import classfile.ConstantPool;

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


/**
 * Class to handle the local variable table attribute.
 *<br><br>
 *
 * @author 	 Tanmay K. Mohapatra
 * @version 1.05, 28th Sep, 2003
 */

public class LocalVariableTableAttribute extends Attribute {
 public Vector vectLocalVariableTable;
 private ConstantPool constPool;
 
 public LocalVariableTableAttribute() {
 sName = Attribute.LOCAL_VARIABLE_TABLE;
 }
 
 void readAttributeDetails(DataInputStream dis, ConstantPool constPoolIn) throws IOException {
 constPool = constPoolIn;
 iAttribLength = dis.readInt();
 int iLocalVariableTableLength;
 vectLocalVariableTable = new Vector();
 if ((iLocalVariableTableLength = dis.readUnsignedShort()) > 0) {
 for (int iIndex=0; iIndex < iLocalVariableTableLength; iIndex++) {
 LocalVariableTableEntry thisEntry = new LocalVariableTableEntry();
 thisEntry.read(dis, constPool);
 thisEntry.addRef();
 vectLocalVariableTable.add(thisEntry);
 }
 }
 }
 
 void writeAttributeDetails(DataOutputStream dos, ConstantPool constPool) throws IOException {
 int iLocalVariableTableLength = vectLocalVariableTable.size();
 
 dos.writeInt(iAttribLength);
 dos.writeShort(iLocalVariableTableLength);
 if (iLocalVariableTableLength > 0) {
 for (int iIndex=0; iIndex < iLocalVariableTableLength; iIndex++) {
 LocalVariableTableEntry thisEntry = (LocalVariableTableEntry) vectLocalVariableTable.elementAt(iIndex);
 thisEntry.write(dos, constPool);
 }
 }
 }
 
 public void addEntry(LocalVariableTableEntry thisEntry) {
 thisEntry.constPool = constPool;
 thisEntry.iIndex = vectLocalVariableTable.size();
 vectLocalVariableTable.add(thisEntry);
 thisEntry.addRef();
 }
 
 public void deleteEntryAt(int iRow) {
 LocalVariableTableEntry thisEntry = (LocalVariableTableEntry) vectLocalVariableTable.elementAt(iRow);
 thisEntry.deleteRef();
 vectLocalVariableTable.removeElementAt(iRow);
 }
 
 public String toString() {
 int iLocalVariableTableLength = vectLocalVariableTable.size();
 
 return "Attribute " + sName + ". Length=" + iAttribLength +
 ". TableLength=" + iLocalVariableTableLength;
 }
 
 public boolean verify(String sPrepend, Vector vectVerifyErrors) {
 return true; // not implemented because local variable table cannot be changed now
 }
}