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package com.modulus.qbar.lang;
import com.modulus.qbar.core.QBObject;
public class QBSubList extends QBList {
private static final long serialVersionUID = 8841750568883987599L;
private QBList original;
private boolean originalIsOriginal = true;
private int offset;
private int length;
public QBSubList(QBList original, int offset, int length) {
super();
this.original = original;
this.offset = offset;
this.length = length;
}
private void checkOriginal(){
if(originalIsOriginal){
original = original.realSubList(offset, length);
originalIsOriginal = false;
}
}
@Override
public QBObject add(QBObject obj) {
checkOriginal();
return original.add(obj);
}
@Override
public void remove(QBObject obj) {
checkOriginal();
original.remove(obj);
}
@Override
public QBObject get(int idx) {
if(originalIsOriginal) {
return original.get(idx + offset);
} else {
return original.get(idx);
}
}
@Override
public double size() {
if( originalIsOriginal )
return this.length;
return original.size();
}
@Override
public void insert(int idx, QBObject obj) {
checkOriginal();
original.insert(idx, obj);
}
@Override
public QBList realSubList(int off, int len) {
return original.realSubList(off + offset, len);
}
public String toString(){
StringBuffer buf = new StringBuffer("[");
for( int i = 0;i < this.size(); i ++)
buf.append( this.get(i).toString() + ", ");
buf.deleteCharAt(buf.length()-1);
buf.deleteCharAt(buf.length()-1);
return buf.toString() + "]";
}
}
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