1 /*
2 * Copyright 2001-2006 Stephen Colebourne
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.joda.primitives.collection.impl;
17
18 import org.joda.primitives.PrimitiveCollectable;
19
20 /**
21 * Abstract base class for collections of primitive elements.
22 *
23 * @author Stephen Colebourne
24 * @since 1.0
25 */
26 public abstract class AbstractPrimitiveCollectable<N> implements PrimitiveCollectable<N> {
27
28 /**
29 * Constructor.
30 */
31 protected AbstractPrimitiveCollectable() {
32 super();
33 }
34
35 // PrimitiveCollectable
36 //-----------------------------------------------------------------------
37 /**
38 * Optimizes the implementation after initialization.
39 * <p>
40 * This implementation does nothing.
41 */
42 public void optimize() {
43 // do nothing
44 }
45
46 /**
47 * Checks whether the object can currently be modified.
48 * <p>
49 * This implementation returns false.
50 *
51 * @return <code>false</code>
52 */
53 public boolean isModifiable() {
54 return false;
55 }
56
57 /**
58 * Checks if the collection is empty.
59 *
60 * @return true if empty
61 */
62 public boolean isEmpty() {
63 return (size() == 0);
64 }
65
66 /**
67 * Clone implementation that calls Object clone().
68 *
69 * @return the clone
70 */
71 public Object clone() {
72 try {
73 return super.clone();
74 } catch (Exception ex) {
75 throw new UnsupportedOperationException("Clone not supported");
76 }
77 }
78
79 }