com.google.ical.iter.RDateIteratorImpl Maven / Gradle / Ivy
// Copyright (C) 2006 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.ical.iter;
import com.google.ical.values.DateValue;
/**
* a recurrence iterator that iterates over an array of dates.
*
* @author [email protected] (Mike Samuel)
*/
final class RDateIteratorImpl implements RecurrenceIterator {
private int i;
private DateValue[] datesUtc;
RDateIteratorImpl(DateValue[] datesUtc) {
this.datesUtc = datesUtc.clone(); // defensive copy
assert increasing(datesUtc); // indirectly checks that not-null.
}
public boolean hasNext() { return i < datesUtc.length; }
public DateValue next() { return datesUtc[i++]; }
public void remove() { throw new UnsupportedOperationException(); }
public void advanceTo(DateValue newStartUtc) {
long startCmp = DateValueComparison.comparable(newStartUtc);
while (i < datesUtc.length
&& startCmp > DateValueComparison.comparable(datesUtc[i])) {
++i;
}
}
/** monotonically. */
private static > boolean increasing(C[] els) {
for (int i = els.length; --i >= 1;) {
if (els[i - 1].compareTo(els[i]) > 0) { return false; }
}
return true;
}
}