| // Copyright 2010 The Apache Software Foundation |
| // |
| // 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 org.apache.tapestry5.func; |
| |
| class LazyRange implements LazyFunction<Integer> |
| { |
| private final int lower, upper, delta; |
| |
| public LazyRange(int lower, int upper, int delta) |
| { |
| this.lower = lower; |
| this.upper = upper; |
| this.delta = delta; |
| } |
| |
| @Override |
| public LazyContinuation<Integer> next() |
| { |
| if (delta < 0 && lower + delta < upper) |
| return null; |
| |
| if (delta > 0 && lower + delta > upper) |
| return null; |
| |
| return new LazyContinuation<Integer>(lower, new LazyRange(lower + delta, upper, delta)); |
| } |
| |
| } |