1 /*
2 * Copyright 2006 the original author or authors.
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
17 package org.springframework.xml;
18
19 import org.springframework.util.ClassUtils;
20
21 /**
22 * Helper class used to find the current version of JAXP. We cannot depend on the Java version, since JAXP can be
23 * upgraded independently of the Java version.
24 * <p/>
25 * Only distinguishes between JAXP 1.0, 1.1, 1.3, and 1.4, since JAXP 1.2 was a maintenance release with no new
26 * classes.
27 *
28 * @author Arjen Poutsma
29 * @since 1.0.0
30 */
31 public abstract class JaxpVersion {
32
33 public static final int JAXP_10 = 0;
34
35 public static final int JAXP_11 = 1;
36
37 public static final int JAXP_13 = 3;
38
39 public static final int JAXP_14 = 4;
40
41 private static final String JAXP_11_CLASS_NAME = "javax.xml.transform.Transformer";
42
43 private static final String JAXP_13_CLASS_NAME = "javax.xml.xpath.XPath";
44
45 private static final String JAXP_14_CLASS_NAME = "javax.xml.transform.stax.StAXSource";
46
47 private static int jaxpVersion = JAXP_10;
48
49 static {
50 try {
51 ClassUtils.forName(JAXP_14_CLASS_NAME);
52 jaxpVersion = JAXP_14;
53 }
54 catch (ClassNotFoundException ex1) {
55 try {
56 ClassUtils.forName(JAXP_13_CLASS_NAME);
57 jaxpVersion = JAXP_13;
58 }
59 catch (ClassNotFoundException ex2) {
60 try {
61 ClassUtils.forName(JAXP_11_CLASS_NAME);
62 jaxpVersion = JAXP_11;
63 }
64 catch (ClassNotFoundException ex3) {
65 // default to JAXP 1.0
66 }
67 }
68 }
69 }
70
71 /**
72 * Gets the JAXP version. This means we can do things like if <code>(getJaxpVersion() < JAXP_13)</code>.
73 *
74 * @return a code comparable to the JAXP_XX codes in this class
75 * @see #JAXP_10
76 * @see #JAXP_11
77 * @see #JAXP_13
78 * @see #JAXP_14
79 */
80 public static int getJaxpVersion() {
81 return jaxpVersion;
82 }
83
84 /**
85 * Convenience method to determine if the current JAXP version is at least 1.3 (packaged with JDK 1.5).
86 *
87 * @return <code>true</code> if the current JAXP version is at least JAXP 1.3
88 * @see #getJaxpVersion()
89 * @see #JAXP_13
90 */
91 public static boolean isAtLeastJaxp13() {
92 return getJaxpVersion() >= JAXP_13;
93 }
94
95 /**
96 * Convenience method to determine if the current JAXP version is at least 1.4 (packaged with JDK 1.6).
97 *
98 * @return <code>true</code> if the current JAXP version is at least JAXP 1.4
99 * @see #getJaxpVersion()
100 * @see #JAXP_14
101 */
102 public static boolean isAtLeastJaxp14() {
103 return getJaxpVersion() >= JAXP_14;
104 }
105
106 }