blob: 53299251febd6cc391063ec198db938ca2f2421d (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/*******************************************************************************
* Copyright (c) 2009, 2015 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.collection;
/**
* Interface defining the classic queue behavior,
* without the backdoors allowed by {@link java.util.Queue}.
* <p>
* Provisional API: This interface is part of an interim API that is still
* under development and expected to change significantly before reaching
* stability. It is available at this early stage to solicit feedback from
* pioneering adopters on the understanding that any code that uses this API
* will almost certainly be broken (repeatedly) as the API evolves.
*
* @param <E> the type of elements contained by the queue
* @see org.eclipse.jpt.common.utility.internal.collection.ArrayQueue
* @see org.eclipse.jpt.common.utility.internal.collection.LinkedQueue
* @see org.eclipse.jpt.common.utility.internal.collection.QueueTools
* @see Stack Stack - for an interface without the semantic baggage of {@link java.util.Stack}
*/
public interface Queue<E> {
/**
* "Enqueue" the specified item to the tail of the queue.
*/
void enqueue(E element);
/**
* "Dequeue" an item from the head of the queue.
*/
E dequeue();
/**
* Return the item on the head of the queue
* without removing it from the queue.
*/
E peek();
/**
* Return whether the queue is empty.
*/
boolean isEmpty();
}
|
