Mercurial > jdk8-mips64-public > langtools / file comparison

comparison: test/tools/javac/api/evalexpr/MemoryFileManager.java

test/tools/javac/api/evalexpr/MemoryFileManager.java

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1 /*
2 * Copyright 2005-2006 Sun Microsystems, Inc. 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 */
23
24 package evalexpr;
25
26 import java.io.ByteArrayOutputStream;
27 import java.io.FilterOutputStream;
28 import java.io.IOException;
29 import java.io.InputStream;
30 import java.io.OutputStream;
31 import java.io.Reader;
32 import java.io.StringReader;
33 import java.net.URI;
34 import java.net.URISyntaxException;
35 import java.nio.CharBuffer;
36 import java.util.HashMap;
37 import java.util.Map;
38 import javax.tools.*;
39 import javax.tools.JavaFileObject.Kind;
40
41 /**
42 * A file manager for compiling strings to byte arrays.
43 * This file manager delegates to another file manager
44 * to lookup classes on boot class path.
45 *
46 * <p><b>This is NOT part of any API supported by Sun Microsystems.
47 * If you write code that depends on this, you do so at your own
48 * risk. This code and its internal interfaces are subject to change
49 * or deletion without notice.</b></p>
50 * @author Peter von der Ah&eacute;
51 */
52 public final class MemoryFileManager extends ForwardingJavaFileManager {
53 /**
54 * Maps binary class names to class files stored as byte arrays.
55 */
56 private Map<String, byte[]> classes;
57
58 /**
59 * Creates a JavaFileObject representing the given compilation unit.
60 * @param name a name representing this source code, for example, the name of a class
61 * @param code a compilation unit (source code for a Java program)
62 * @return a JavaFileObject represtenting the given compilation unit
63 */
64 public static JavaFileObject makeSource(String name, String code) {
65 return new JavaSourceFromString(name, code);
66 }
67
68 /**
69 * Construct a memory file manager which delegates to the specified
70 * file manager for unknown sources.
71 * @param fileManager a file manager used to look up class files on class path, etc.
72 */
73 public MemoryFileManager(JavaFileManager fileManager) {
74 super(fileManager);
75 classes = new HashMap<String, byte[]>();
76 }
77
78 /**
79 * Get a class loader which first search the classes stored
80 * by this file mananger.
81 * @return a class loader for compiled files
82 */
83 @Override
84 public ClassLoader getClassLoader(Location location) {
85 return new ByteArrayClassLoader(classes);
86 }
87
88 @Override
89 public JavaFileObject getJavaFileForOutput(Location location,
90 String name,
91 Kind kind,
92 FileObject originatingSource)
93 throws UnsupportedOperationException
94 {
95 if (originatingSource instanceof JavaSourceFromString) {
96 return new JavaClassInArray(name);
97 } else {
98 throw new UnsupportedOperationException();
99 }
100 }
101
102 protected static URI uriFromString(String uri) {
103 try {
104 return new URI(uri);
105 } catch (URISyntaxException e) {
106 throw new IllegalArgumentException(e);
107 }
108 }
109
110 /**
111 * A file object representing a Java class file stored in a byte array.
112 */
113 private class JavaClassInArray extends SimpleJavaFileObject {
114
115 private String name;
116
117 /**
118 * Constructs a JavaClassInArray object.
119 * @param name binary name of the class to be stored in this file object
120 */
121 JavaClassInArray(String name) {
122 super(uriFromString("mfm:///" + name.replace('.','/') + Kind.CLASS.extension),
123 Kind.CLASS);
124 this.name = name;
125 }
126
127 public OutputStream openOutputStream() {
128 return new FilterOutputStream(new ByteArrayOutputStream()) {
129 public void close() throws IOException {
130 out.close();
131 ByteArrayOutputStream bos = (ByteArrayOutputStream)out;
132 classes.put(name, bos.toByteArray());
133 System.out.println("compiled " + name);
134 }
135 };
136 }
137 }
138
139 /**
140 * A file object used to represent source coming from a string.
141 */
142 private static class JavaSourceFromString extends SimpleJavaFileObject {
143 /**
144 * The source code of this "file".
145 */
146 final String code;
147
148 /**
149 * Constructs a new JavaSourceFromString.
150 * @param name the name of the compilation unit represented by this file object
151 * @param code the source code for the compilation unit represented by this file object
152 */
153 JavaSourceFromString(String name, String code) {
154 super(uriFromString("mfm:///" + name.replace('.','/') + Kind.SOURCE.extension),
155 Kind.SOURCE);
156 this.code = code;
157 }
158
159 @Override
160 public CharSequence getCharContent(boolean ignoreEncodingErrors) {
161 return code;
162 }
163 }
164
165 }

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