src/share/classes/com/sun/tools/doclets/internal/toolkit/util/DocPath.java

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1 /*
2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.doclets.internal.toolkit.util;
27
28 import com.sun.javadoc.ClassDoc;
29 import com.sun.javadoc.PackageDoc;
30
31 /**
32 * Abstraction for immutable relative paths.
33 * Paths always use '/' as a separator, and never begin or end with '/'.
34 *
35 * <p><b>This is NOT part of any supported API.
36 * If you write code that depends on this, you do so at your own risk.
37 * This code and its internal interfaces are subject to change or
38 * deletion without notice.</b>
39 */
40 public class DocPath {
41 private final String path;
42
43 /** The empty path. */
44 public static final DocPath empty = new DocPath("");
45
46 /** The empty path. */
47 public static final DocPath parent = new DocPath("..");
48
49 /**
50 * Create a path from a string.
51 */
52 public static DocPath create(String p) {
53 return (p == null) || p.isEmpty() ? empty : new DocPath(p);
54 }
55
56 /**
57 * Return the path for a class.
58 * For example, if the class is java.lang.Object,
59 * the path is java/lang/Object.html.
60 */
61 public static DocPath forClass(ClassDoc cd) {
62 return (cd == null) ? empty :
63 forPackage(cd.containingPackage()).resolve(forName(cd));
64 }
65
66 /**
67 * Return the path for the simple name of the class.
68 * For example, if the class is java.lang.Object,
69 * the path is Object.html.
70 */
71 public static DocPath forName(ClassDoc cd) {
72 return (cd == null) ? empty : new DocPath(cd.name() + ".html");
73 }
74
75 /**
76 * Return the path for the package of a class.
77 * For example, if the class is java.lang.Object,
78 * the path is java/lang.
79 */
80 public static DocPath forPackage(ClassDoc cd) {
81 return (cd == null) ? empty : forPackage(cd.containingPackage());
82 }
83
84 /**
85 * Return the path for a package.
86 * For example, if the package is java.lang,
87 * the path is java/lang.
88 */
89 public static DocPath forPackage(PackageDoc pd) {
90 return (pd == null) ? empty : DocPath.create(pd.name().replace('.', '/'));
91 }
92
93 /**
94 * Return the inverse path for a package.
95 * For example, if the package is java.lang,
96 * the inverse path is ../...
97 */
98 public static DocPath forRoot(PackageDoc pd) {
99 String name = (pd == null) ? "" : pd.name();
100 if (name.isEmpty())
101 return empty;
102 return new DocPath(name.replace('.', '/').replaceAll("[^/]+", ".."));
103 }
104
105 /**
106 * Return the relative path from one package to another.
107 */
108 public static DocPath relativePath(PackageDoc from, PackageDoc to) {
109 return forRoot(from).resolve(forPackage(to));
110 }
111
112 protected DocPath(String p) {
113 path = (p.endsWith("/") ? p.substring(0, p.length() - 1) : p);
114 }
115
116 /** {@inheritDoc} */
117 @Override
118 public boolean equals(Object other) {
119 return (other instanceof DocPath) && path.equals(((DocPath)other).path);
120 }
121
122 /** {@inheritDoc} */
123 @Override
124 public int hashCode() {
125 return path.hashCode();
126 }
127
128 public DocPath basename() {
129 int sep = path.lastIndexOf("/");
130 return (sep == -1) ? this : new DocPath(path.substring(sep + 1));
131 }
132
133 public DocPath parent() {
134 int sep = path.lastIndexOf("/");
135 return (sep == -1) ? empty : new DocPath(path.substring(0, sep));
136 }
137
138 /**
139 * Return the path formed by appending the specified string to the current path.
140 */
141 public DocPath resolve(String p) {
142 if (p == null || p.isEmpty())
143 return this;
144 if (path.isEmpty())
145 return new DocPath(p);
146 return new DocPath(path + "/" + p);
147 }
148
149 /**
150 * Return the path by appending the specified path to the current path.
151 */
152 public DocPath resolve(DocPath p) {
153 if (p == null || p.isEmpty())
154 return this;
155 if (path.isEmpty())
156 return p;
157 return new DocPath(path + "/" + p.getPath());
158 }
159
160 /**
161 * Return the inverse path for this path.
162 * For example, if the path is a/b/c, the inverse path is ../../..
163 */
164 public DocPath invert() {
165 return new DocPath(path.replaceAll("[^/]+", ".."));
166 }
167
168 /**
169 * Return true if this path is empty.
170 */
171 public boolean isEmpty() {
172 return path.isEmpty();
173 }
174
175 public DocLink fragment(String fragment) {
176 return new DocLink(path, null, fragment);
177 }
178
179 public DocLink query(String query) {
180 return new DocLink(path, query, null);
181 }
182
183 /**
184 * Return this path as a string.
185 */
186 // This is provided instead of using toString() to help catch
187 // unintended use of toString() in string concatenation sequences.
188 public String getPath() {
189 return path;
190 }
191 }

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