Ben Dodson | 920dbbb | 2010-08-04 15:21:06 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 Google Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.google.doclava; |
| 18 | |
| 19 | import java.io.File; |
| 20 | import java.io.FileOutputStream; |
| 21 | import java.io.IOException; |
| 22 | import java.io.InputStream; |
| 23 | import java.net.URL; |
| 24 | import java.util.Enumeration; |
| 25 | import java.util.jar.JarEntry; |
| 26 | import java.util.jar.JarFile; |
| 27 | |
| 28 | public class JarUtils { |
| 29 | /** |
| 30 | * Returns the jar file used to load class clazz, or defaultJar if clazz was not loaded from a |
| 31 | * jar. |
| 32 | */ |
| 33 | public static JarFile jarForClass(Class<?> clazz, JarFile defaultJar) { |
| 34 | String path = "/" + clazz.getName().replace('.', '/') + ".class"; |
| 35 | URL jarUrl = clazz.getResource(path); |
| 36 | if (jarUrl == null) { |
| 37 | return defaultJar; |
| 38 | } |
| 39 | |
| 40 | String url = jarUrl.toString(); |
| 41 | int bang = url.indexOf("!"); |
| 42 | String JAR_URI_PREFIX = "jar:file:"; |
| 43 | if (url.startsWith(JAR_URI_PREFIX) && bang != -1) { |
| 44 | try { |
| 45 | return new JarFile(url.substring(JAR_URI_PREFIX.length(), bang)); |
| 46 | } catch (IOException e) { |
| 47 | throw new IllegalStateException("Error loading jar file.", e); |
| 48 | } |
| 49 | } else { |
| 50 | return defaultJar; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Copies a directory from a jar file to an external directory. |
| 56 | */ |
| 57 | public static void copyResourcesToDirectory(JarFile fromJar, String jarDir, String destDir) |
| 58 | throws IOException { |
| 59 | for (Enumeration<JarEntry> entries = fromJar.entries(); entries.hasMoreElements();) { |
| 60 | JarEntry entry = entries.nextElement(); |
| 61 | if (entry.getName().startsWith(jarDir + "/") && !entry.isDirectory()) { |
| 62 | File dest = new File(destDir + "/" + entry.getName().substring(jarDir.length() + 1)); |
| 63 | File parent = dest.getParentFile(); |
| 64 | if (parent != null) { |
| 65 | parent.mkdirs(); |
| 66 | } |
| 67 | |
| 68 | FileOutputStream out = new FileOutputStream(dest); |
| 69 | InputStream in = fromJar.getInputStream(entry); |
| 70 | |
| 71 | try { |
| 72 | byte[] buffer = new byte[8 * 1024]; |
| 73 | |
| 74 | int s = 0; |
| 75 | while ((s = in.read(buffer)) > 0) { |
| 76 | out.write(buffer, 0, s); |
| 77 | } |
| 78 | } catch (IOException e) { |
| 79 | throw new IOException("Could not copy asset from jar file", e); |
| 80 | } finally { |
| 81 | try { |
| 82 | in.close(); |
| 83 | } catch (IOException ignored) {} |
| 84 | try { |
| 85 | out.close(); |
| 86 | } catch (IOException ignored) {} |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | } |
| 92 | |
| 93 | private JarUtils() {} // non-instantiable |
| 94 | } |