dol: initial dol commit

[jump.git] / dol / src / dol / util / JarCopier.java

diff --git a/dol/src/dol/util/JarCopier.java b/dol/src/dol/util/JarCopier.java
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+++ b/dol/src/dol/util/JarCopier.java
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+/* $Id: JarCopier.java 1 2010-02-24 13:03:05Z haidw $ */\r
+package dol.util;\r
+\r
+import java.io.File;\r
+import java.io.FileOutputStream;\r
+import java.io.IOException;\r
+import java.io.InputStream;\r
+import java.io.OutputStream;\r
+import java.util.Enumeration;\r
+import java.util.Vector;\r
+import java.util.jar.JarEntry;\r
+import java.util.jar.JarFile;\r
+\r
+/**\r
+ * Class to copy files from a jar archive.\r
+ */\r
+public class JarCopier {\r
+\r
+    /**\r
+     * Copy a file from the specified jar file to the specified\r
+     * destination file. The file path must be specified using forward\r
+     * slashes, for instance, META-INF/MANIFEST.MF.\r
+     *\r
+     * @param jar jar archive\r
+     * @param from file to extract from jar archive\r
+     * @param to file to copy the file to\r
+     */\r
+    public void copyFile(JarFile jar, String from, String to) {\r
+        try {\r
+            InputStream in = jar.getInputStream(jar.getEntry(from));\r
+            OutputStream out = new FileOutputStream(new File(to));\r
+            int c;\r
+            while ((c = in.read()) != -1) {\r
+                out.write(c);\r
+            }\r
+            in.close();\r
+            out.close();\r
+        }\r
+        catch (IOException e) {\r
+            System.out.println("An error has occured while copying \""\r
+                    + from + "\" to \"" + to + "\":");\r
+            System.out.println(e.getMessage());\r
+        }\r
+    }\r
+\r
+    /**\r
+     * Get all files located in the given path of the given jar archive.\r
+     * The path must be specified with forward slashes.\r
+     *\r
+     * @param jar jar archive\r
+     * @param path path to search for files\r
+     * @return vector of all files in the specified path\r
+     */\r
+    public Vector<String> getFilesInDirectory(JarFile jar, String path) {\r
+        Vector<String> filelist = new Vector<String>();\r
+        Enumeration<JarEntry> entries = jar.entries();\r
+\r
+        while (entries.hasMoreElements()) {\r
+            String entry = entries.nextElement().toString();\r
+            if (entry.startsWith(path)) {\r
+                filelist.add(entry);\r
+            }\r
+        }\r
+        return filelist;\r
+    }\r
+\r
+    /**\r
+     * Recursively copy a directory from the specified jar archive.\r
+     *\r
+     * @param jar jar archive\r
+     * @param srcDir source directory\r
+     * @param destDir target directory\r
+     */\r
+    public void copy(JarFile jar, String srcDir, String destDir)\r
+            throws IOException {\r
+        File directory = new File(destDir);\r
+        if (!directory.exists()) {\r
+            directory.mkdirs();\r
+        }\r
+        for (String file : getFilesInDirectory(jar, srcDir)) {\r
+            String dir = file.substring(0, file.lastIndexOf("/"));\r
+            directory = new File(destDir\r
+                    + System.getProperty("file.separator")\r
+                    + dir.substring(srcDir.length()));\r
+            if (!directory.exists()) {\r
+                directory.mkdirs();\r
+            }\r
+            if (!file.endsWith("/")) {\r
+                copyFile(jar, file, destDir\r
+                        + System.getProperty("file.separator")\r
+                        + file.substring(srcDir.length() + 1));\r
+            }\r
+        }\r
+    }\r
+\r
+    /**\r
+     * Copy the specified directory from the jar archive to the specified\r
+     * destination.\r
+     *\r
+     * @param args args[0] specifies the jar file to read from,\r
+     *             args[1] specifies the source directory,\r
+     *             args[2] specifies the destination directory\r
+     */\r
+    public static void main(String args[])\r
+            throws Exception {\r
+        JarCopier copier = new JarCopier();\r
+        JarFile jar = new JarFile(args[0]);\r
+        if (args.length == 3)\r
+            copier.copy(jar, args[1], args[2]);\r
+        else\r
+            System.out.println("usage: java JarCopier "\r
+                    + "jarFile sourceDirectory targetDirectory");\r
+    }\r
+}
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