01: /*
02: * Janino - An embedded Java[TM] compiler
03: *
04: * Copyright (c) 2001-2007, Arno Unkrig
05: * All rights reserved.
06: *
07: * Redistribution and use in source and binary forms, with or without
08: * modification, are permitted provided that the following conditions
09: * are met:
10: *
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above
14: * copyright notice, this list of conditions and the following
15: * disclaimer in the documentation and/or other materials
16: * provided with the distribution.
17: * 3. The name of the author may not be used to endorse or promote
18: * products derived from this software without specific prior
19: * written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
25: * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27: * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29: * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31: * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32: */
33:
34: package org.codehaus.janino.util.resource;
35:
36: import java.io.*;
37: import java.util.*;
38:
39: /**
40: * A {@link org.codehaus.janino.util.resource.FileResourceFinder} that finds file resources in
41: * a directory. The name of the file is constructed by concatenating a dirctory name
42: * with the resource name such that slashes in the resource name map to file
43: * separators.
44: */
45: public class DirectoryResourceFinder extends FileResourceFinder {
46: private final File directory;
47: private final Map subdirectoryNameToFiles = new HashMap(); // String directoryName => Set => File
48:
49: /**
50: * @param directory the directory to use as the search base
51: */
52: public DirectoryResourceFinder(File directory) {
53: this .directory = directory;
54: }
55:
56: public String toString() {
57: return "dir:" + this .directory;
58: }
59:
60: // Implement FileResourceFinder.
61: protected File findResourceAsFile(String resourceName) {
62:
63: // Determine the subdirectory name (null for no subdirectory).
64: int idx = resourceName.lastIndexOf('/');
65: String subdirectoryName = (idx == -1 ? null : resourceName
66: .substring(0, idx).replace('/', File.separatorChar));
67:
68: // Determine files existing in this subdirectory.
69: Set files = (Set) this .subdirectoryNameToFiles
70: .get(subdirectoryName); // String directoryName => Set => File
71: if (files == null) {
72: File subDirectory = (subdirectoryName == null) ? this .directory
73: : new File(this .directory, subdirectoryName);
74: File[] fa = subDirectory.listFiles();
75: files = (fa == null) ? Collections.EMPTY_SET : new HashSet(
76: Arrays.asList(fa));
77: this .subdirectoryNameToFiles.put(subdirectoryName, files);
78: }
79:
80: // Notice that "File.equals()" performs all the file-system dependent
81: // magic like case conversion.
82: File file = new File(this .directory, resourceName.replace('/',
83: File.separatorChar));
84: if (!files.contains(file))
85: return null;
86:
87: return file;
88: }
89: }
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