1/*
2 * Javassist, a Java-bytecode translator toolkit.
3 * Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved.
4 *
5 * The contents of this file are subject to the Mozilla Public License Version
6 * 1.1 (the "License"); you may not use this file except in compliance with
7 * the License.  Alternatively, the contents of this file may be used under
8 * the terms of the GNU Lesser General Public License Version 2.1 or later.
9 *
10 * Software distributed under the License is distributed on an "AS IS" basis,
11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 * for the specific language governing rights and limitations under the
13 * License.
14 */
15
16package javassist;
17
18import java.io.*;
19import java.net.URL;
20import java.net.MalformedURLException;
21
22/**
23 * A <code>ByteArrayClassPath</code> contains bytes that is served as
24 * a class file to a <code>ClassPool</code>.  It is useful to convert
25 * a byte array to a <code>CtClass</code> object.
26 *
27 * <p>For example, if you want to convert a byte array <code>b</code>
28 * into a <code>CtClass</code> object representing the class with a name
29 * <code>classname</code>, then do as following:
30 *
31 * <ul><pre>
32 * ClassPool cp = ClassPool.getDefault();
33 * cp.insertClassPath(new ByteArrayClassPath(classname, b));
34 * CtClass cc = cp.get(classname);
35 * </pre></ul>
36 *
37 * <p>The <code>ClassPool</code> object <code>cp</code> uses the created
38 * <code>ByteArrayClassPath</code> object as the source of the class file.
39 *
40 * <p>A <code>ByteArrayClassPath</code> must be instantiated for every
41 * class.  It contains only a single class file.
42 *
43 * @see javassist.ClassPath
44 * @see ClassPool#insertClassPath(ClassPath)
45 * @see ClassPool#appendClassPath(ClassPath)
46 * @see ClassPool#makeClass(InputStream)
47 */
48public class ByteArrayClassPath implements ClassPath {
49    protected String classname;
50    protected byte[] classfile;
51
52    /*
53     * Creates a <code>ByteArrayClassPath</code> containing the given
54     * bytes.
55     *
56     * @param name              a fully qualified class name
57     * @param classfile         the contents of a class file.
58     */
59    public ByteArrayClassPath(String name, byte[] classfile) {
60        this.classname = name;
61        this.classfile = classfile;
62    }
63
64    /**
65     * Closes this class path.
66     */
67    public void close() {}
68
69    public String toString() {
70        return "byte[]:" + classname;
71    }
72
73    /**
74     * Opens the class file.
75     */
76    public InputStream openClassfile(String classname) {
77        if(this.classname.equals(classname))
78            return new ByteArrayInputStream(classfile);
79        else
80            return null;
81    }
82
83    /**
84     * Obtains the URL.
85     */
86    public URL find(String classname) {
87        if(this.classname.equals(classname)) {
88            String cname = classname.replace('.', '/') + ".class";
89            try {
90                // return new File(cname).toURL();
91                return new URL("file:/ByteArrayClassPath/" + cname);
92            }
93            catch (MalformedURLException e) {}
94        }
95
96        return null;
97    }
98}
99