package com.coderising.jvm.attr;
import java.util.ArrayList;
import java.util.List;
import com.coderising.jvm.loader.ByteCodeIterator;
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 attribute_name_index) {
int ccc = (iter.codes.length);
long attribute_len = iter.nextU4ToInt();
int line_number_table_len = iter.nextU2ToInt();
LineNumberTable table = new LineNumberTable(attribute_name_index,(int)attribute_len);
/*byte[] bytes = iter.getBytes(line_number_table_len);
ByteCodeIterator lntIter = new ByteCodeIterator(bytes);*/
/*while (lntIter.isNotEnd()) {
//int c = lntIter.codes.length;
LineNumberItem item = new LineNumberItem();
item.setStartPC(lntIter.nextU2ToInt());
item.setLineNum(lntIter.nextU2ToInt());
table.addLineNumberItem(item);
}*/
for (int i = 0; i <line_number_table_len ; i++) {
LineNumberItem item = new LineNumberItem();
item.setStartPC(iter.nextU2ToInt());
item.setLineNum(iter.nextU2ToInt());
table.addLineNumberItem(item);
}
return table;
}
public String toString(){
StringBuilder buffer = new StringBuilder();
buffer.append("Line Number Table:\n");
for(LineNumberItem item : items){
buffer.append("startPC:"+item.getStartPC()).append(",");
buffer.append("lineNum:"+item.getLineNum()).append("\n");
}
buffer.append("\n");
return buffer.toString();
}
}