private HelperGroup createSingleElementGroup(Helper helper) {
HelperGroup hg = new HelperGroup();
hg.totalCapacity = helper.capacity;
hg.helpers = new ArrayList<Helper>();
hg.helpers.add(helper);
return hg;
}
private HelperGroup createGroupWithExtraElement(HelperGroup group, Helper helper) {
HelperGroup hg = new HelperGroup();
hg.totalCapacity = group.totalCapacity + helper.capacity;
hg.helpers = new ArrayList<Helper>(group.helpers);
hg.helpers.add(helper);
return hg;
}
private HelperGroup createEmptyGroup() {
HelperGroup hg = new HelperGroup();
hg.totalCapacity = 0;
hg.helpers = new ArrayList<Helper>();
return hg;
}