package main.coding_170430.jvm.attr;
import main.coding_170430.jvm.loader.ByteCodeIterator;
import java.util.ArrayList;
import java.util.List;
/**
* Created by peter on 2017/4/21.
*/
public class LineNumberTable extends AttributeInfo {
List<LineNumberItem> items = new ArrayList<>();
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 iterator) {
int index = iterator.nextU2ToInt();
int len = iterator.nextU4ToInt();
LineNumberTable table = new LineNumberTable(index, len);
for (int i = 1; i < len; i++) {
LineNumberItem item = new LineNumberItem();
item.setStartPC(iterator.nextU2ToInt());
item.setLineNum(iterator.nextU2ToInt());
table.addLineNumberItem(item);
}
return table;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Line Number Table:\n");
for(LineNumberItem item:items){
sb.append("startPC:"+item.getStartPC()).append(",");
sb.append("LineNum:"+item.getLineNum()).append("\n");
}
sb.append("\n");
return sb.toString();
}
}