LineNumberTable.java

package com.coderising.jvm.attr;

import java.util.ArrayList;
import java.util.List;

import com.coderising.jvm.loader.ByteCodeIterator;

@SuppressWarnings("unused")
public class LineNumberTable extends AttributeInfo {
	
	List<LineNumberItem> items = new ArrayList<LineNumberItem>();
	
	private static class LineNumberItem{
		int startPC;
		int lineNum;		
		public int getStartPC() {
			return startPC;
		}
		public void setStartPC(int startPC) {
			this.startPC = startPC;
		}
		public int getLineNum() {
			return lineNum;
		}
		public void setLineNum(int lineNum) {
			this.lineNum = lineNum;
		}
	}
	public void addLineNumberItem(LineNumberItem item){
		this.items.add(item);
	}
	public LineNumberTable(int attrNameIndex, int attrLen) {
		super(attrNameIndex, attrLen);
		
	}
	
	public static LineNumberTable parse(ByteCodeIterator iter){
		
		int nameIndex = iter.nextU2ToInt();
		int attrLen = iter.nextU4ToInt();		
		LineNumberTable lineNumberTable = new LineNumberTable(nameIndex,attrLen);
		
		int tableLen = iter.nextU2ToInt();
		
		for (int i = 0; i < tableLen; i++) {
			
			int startPC = iter.nextU2ToInt();
			int lineNum = iter.nextU2ToInt();
			
			LineNumberItem item = new LineNumberItem();
			item.setLineNum(startPC);
			item.setLineNum(lineNum);	
			
			lineNumberTable.addLineNumberItem(item);
		}
		
		return lineNumberTable;
	}

}