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package com.modulus.qbar.lang;
import java.util.ArrayList;
import java.util.List;
import com.modulus.qbar.core.QBObject;
import com.modulus.qbar.core.primitive.QBDouble;
import com.modulus.qbar.core.primitive.QBInt;
import com.modulus.qbar.core.primitive.QBPrimitive;
public class QBLazyRangeList extends QBList{
private static final long serialVersionUID = -782755006057179634L;
private QBPrimitive startValue;
private QBPrimitive endValue;
private QBPrimitive changeValue;
private boolean isIntegers;
private boolean isInfinite;
//private List<QBPrimitive> items = new ArrayList<QBPrimitive>();
public QBLazyRangeList(QBPrimitive startValue, QBPrimitive endValue,
QBPrimitive changeValue) {
super();
this.startValue = startValue;
this.endValue = endValue;
this.changeValue = changeValue;
if(endValue == null)
isInfinite = true;
if(changeValue == null)
this.changeValue = new QBInt(1);
if(this.changeValue instanceof QBInt && this.startValue instanceof QBInt)
isIntegers = true;
}
@Override
public QBObject add(QBObject obj) {
return this;
}
@Override
public void remove(QBObject obj) {
// TODO Auto-generated method stub
}
@Override
public QBPrimitive get(int idx) {
if(idx < 0)
idx = (int) (this.size() + idx);
if( isIntegers )
{
int ret = startValue.intValue() + idx * changeValue.intValue();
if( this.isInfinite || ret <= endValue.intValue() )
return new QBInt(ret);
else
throw new ArrayIndexOutOfBoundsException("The index: " + idx + " is out of range for " + this + "\nMax value is: " + endValue + " got " + ret);
} else{
double ret = startValue.doubleValue() + idx * changeValue.doubleValue();
if( this.isInfinite || ret <= endValue.doubleValue() )
return new QBDouble(ret);
else
throw new ArrayIndexOutOfBoundsException("The index: " + idx + " is out of range for " + this + "\nMax value is: " + endValue + " got " + ret);
}
}
@Override
public double size() {
if(isInfinite)
return Double.POSITIVE_INFINITY;
else
return Math.abs(endValue.doubleValue() - startValue.doubleValue()) / changeValue.doubleValue() + 1;
}
@Override
public void insert(int idx, QBObject obj) {
// TODO Auto-generated method stub
}
@Override
public QBList realSubList(int off, int len) {
return new QBLazyRangeList(get(off), get(off + len), changeValue);
}
}
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