SmartFileObject.java revision 2571:10fc81ac75b4 
1/*
2 * Copyright (c) 2012, 2013, 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
26package com.sun.tools.sjavac.comp;
27
28import java.io.*;
29import java.net.URI;
30import javax.lang.model.element.Modifier;
31import javax.lang.model.element.NestingKind;
32import javax.tools.JavaFileObject;
33
34/**
35 * The SmartFileObject will return an outputstream that cache the written data
36 * and compare the new content with the old content on disk. Only if they differ,
37 * will the file be updated.
38 *
39 * <p><b>This is NOT part of any supported API.
40 * If you write code that depends on this, you do so at your own
41 * risk.  This code and its internal interfaces are subject to change
42 * or deletion without notice.</b></p>
43 */
44public class SmartFileObject implements JavaFileObject {
45
46    JavaFileObject file;
47    PrintWriter stdout;
48
49    public SmartFileObject(JavaFileObject r, PrintWriter pw) {
50        file = r;
51        stdout = pw;
52    }
53
54    @Override
55    public boolean equals(Object other) {
56        return file.equals(other);
57    }
58
59    @Override
60    public int hashCode() {
61        return file.hashCode();
62    }
63
64    public Kind getKind() {
65        return file.getKind();
66    }
67
68    public boolean isNameCompatible(String simpleName, Kind kind) {
69        return file.isNameCompatible(simpleName, kind);
70    }
71
72    public URI toUri() {
73        return file.toUri();
74    }
75
76    public String getName() {
77        return file.getName();
78    }
79
80    public InputStream openInputStream() throws IOException {
81        return file.openInputStream();
82    }
83
84    public OutputStream openOutputStream() throws IOException {
85        return file.openOutputStream();
86    }
87
88    public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
89        return file.getCharContent(ignoreEncodingErrors);
90    }
91
92    static String lineseparator = System.getProperty("line.separator");
93
94    public Writer openWriter() throws IOException {
95        StringBuilder s = new StringBuilder();
96        try (BufferedReader r = new BufferedReader(file.openReader(true))) {
97            while (r.ready()) {
98                s.append(r.readLine()+lineseparator);
99            }
100        } catch (FileNotFoundException e) {
101            // Perfectly ok.
102        }
103        return new SmartWriter(file, s.toString(), file.getName(), stdout);
104    }
105
106    public long getLastModified() {
107        return file.getLastModified();
108    }
109
110    public boolean delete() {
111        return file.delete();
112    }
113
114    public Modifier getAccessLevel() {
115        return file.getAccessLevel();
116    }
117
118    public NestingKind getNestingKind() {
119        return file.getNestingKind();
120    }
121
122    public Reader openReader(boolean ignoreEncodingErrors) throws IOException {
123        return file.openReader(ignoreEncodingErrors);
124    }
125
126}
127