package org.simantics.db.impl.graph;

import java.util.AbstractList;
import java.util.List;

public class RandomAccessSubList<T> extends AbstractList<T> {
    private final List<T> baseList;
    private final int fromIndex;
    private final int length;
    
    public RandomAccessSubList(List<T> baseList, int fromIndex, int length) {
        this.baseList = baseList;
        this.fromIndex = fromIndex;
        this.length = length;
    }

    @Override
    public T get(int index) {
        if(index < 0 || index > length)
            throw new IndexOutOfBoundsException();
        return baseList.get(index+fromIndex);
    }

    @Override
    public int size() {
        return length;
    }
}