1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20 package org.apache.shiro.lang.util;
21
22 import java.io.Closeable;
23 import java.io.IOException;
24
25 /**
26 * To use try-with-resources idiom, this class supports wrapping existing ByteSource
27 * object or byte array. At end of try block, it gets zeroed out automatically.
28 */
29 public final class ByteSourceWrapper implements Closeable {
30 private final byte[] bytes;
31
32 private ByteSourceWrapper(byte[] bytes) {
33 this.bytes = bytes;
34 }
35
36 /**
37 * This method generically accepts byte array or ByteSource instance.
38 */
39 public static ByteSourceWrapper wrap(Object value) {
40 if (value instanceof byte[]) {
41 byte[] bytes = (byte[]) value;
42 return new ByteSourceWrapper(bytes);
43 } else if (value instanceof ByteSource) {
44 byte[] bytes = ((ByteSource) value).getBytes();
45 return new ByteSourceWrapper(bytes);
46 }
47 throw new IllegalArgumentException();
48 }
49
50 public byte[] getBytes() {
51 return bytes;
52 }
53
54 public void close() throws IOException {
55 ByteUtils.wipe(bytes);
56 }
57 }