javassist.bytecode.analysis.IntQueue Maven / Gradle / Ivy
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.bytecode.analysis;
import java.util.NoSuchElementException;
class IntQueue {
private static class Entry {
private IntQueue.Entry next;
private int value;
private Entry(int value) {
this.value = value;
}
}
private IntQueue.Entry head;
private IntQueue.Entry tail;
void add(int value) {
IntQueue.Entry entry = new Entry(value);
if (tail != null)
tail.next = entry;
tail = entry;
if (head == null)
head = entry;
}
boolean isEmpty() {
return head == null;
}
int take() {
if (head == null)
throw new NoSuchElementException();
int value = head.value;
head = head.next;
if (head == null)
tail = null;
return value;
}
}