jet.CharProgressionIterator Maven / Gradle / Ivy
/*
* Copyright 2010-2013 JetBrains s.r.o.
*
* 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 jet;
import jet.runtime.ProgressionUtil;
class CharProgressionIterator extends CharIterator {
private int next;
private final int increment;
private final char finalElement;
private boolean hasNext;
public CharProgressionIterator(char start, char end, int increment) {
this.next = start;
this.increment = increment;
this.finalElement = (char) ProgressionUtil.getProgressionFinalElement(start, end, increment);
this.hasNext = increment > 0 ? start <= end : start >= end;
}
@Override
public boolean hasNext() {
return hasNext;
}
@Override
public char nextChar() {
int value = next;
if (value == finalElement) {
hasNext = false;
}
else {
next += increment;
}
return (char) value;
}
}