1 files changed, 156 insertions, 0 deletions
diff --git a/src/proguard/obfuscate/SimpleNameFactory.java b/src/proguard/obfuscate/SimpleNameFactory.java
new file mode 100644
index 0000000..bce22de
--- /dev/null
+++ b/src/proguard/obfuscate/SimpleNameFactory.java
@@ -0,0 +1,156 @@
+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.obfuscate;
+
+import java.util.*;
+
+
+/**
+ * This <code>NameFactory</code> generates unique short names, using mixed-case
+ * characters or lower-case characters only.
+ *
+ * @author Eric Lafortune
+ */
+public class SimpleNameFactory implements NameFactory
+{
+    private static final int CHARACTER_COUNT = 26;
+
+    private static final List cachedMixedCaseNames = new ArrayList();
+    private static final List cachedLowerCaseNames = new ArrayList();
+
+    private final boolean generateMixedCaseNames;
+    private int     index = 0;
+
+
+    /**
+     * Creates a new <code>SimpleNameFactory</code> that generates mixed-case names.
+     */
+    public SimpleNameFactory()
+    {
+        this(true);
+    }
+
+
+    /**
+     * Creates a new <code>SimpleNameFactory</code>.
+     * @param generateMixedCaseNames a flag to indicate whether the generated
+     *                               names will be mixed-case, or lower-case only.
+     */
+    public SimpleNameFactory(boolean generateMixedCaseNames)
+    {
+        this.generateMixedCaseNames = generateMixedCaseNames;
+    }
+
+
+    // Implementations for NameFactory.
+
+    public void reset()
+    {
+        index = 0;
+    }
+
+
+    public String nextName()
+    {
+        return name(index++);
+    }
+
+
+    /**
+     * Returns the name at the given index.
+     */
+    private String name(int index)
+    {
+        // Which cache do we need?
+        List cachedNames = generateMixedCaseNames ?
+            cachedMixedCaseNames :
+            cachedLowerCaseNames;
+
+        // Do we have the name in the cache?
+        if (index < cachedNames.size())
+        {
+            return (String)cachedNames.get(index);
+        }
+
+        // Create a new name and cache it.
+        String name = newName(index);
+        cachedNames.add(index, name);
+
+        return name;
+    }
+
+
+    /**
+     * Creates and returns the name at the given index.
+     */
+    private String newName(int index)
+    {
+        // If we're allowed to generate mixed-case names, we can use twice as
+        // many characters.
+        int totalCharacterCount = generateMixedCaseNames ?
+            2 * CHARACTER_COUNT :
+            CHARACTER_COUNT;
+
+        int baseIndex = index / totalCharacterCount;
+        int offset    = index % totalCharacterCount;
+
+        char newChar = charAt(offset);
+
+        String newName = baseIndex == 0 ?
+            new String(new char[] { newChar }) :
+            (name(baseIndex-1) + newChar);
+
+        return newName;
+    }
+
+
+    /**
+     * Returns the character with the given index, between 0 and the number of
+     * acceptable characters.
+     */
+    private char charAt(int index)
+    {
+        return (char)((index < CHARACTER_COUNT ? 'a' - 0               :
+                                                 'A' - CHARACTER_COUNT) + index);
+    }
+
+
+    public static void main(String[] args)
+    {
+        System.out.println("Some mixed-case names:");
+        printNameSamples(new SimpleNameFactory(true), 60);
+        System.out.println("Some lower-case names:");
+        printNameSamples(new SimpleNameFactory(false), 60);
+        System.out.println("Some more mixed-case names:");
+        printNameSamples(new SimpleNameFactory(true), 80);
+        System.out.println("Some more lower-case names:");
+        printNameSamples(new SimpleNameFactory(false), 80);
+    }
+
+
+    private static void printNameSamples(SimpleNameFactory factory, int count)
+    {
+        for (int counter = 0; counter < count; counter++)
+        {
+            System.out.println("  ["+factory.nextName()+"]");
+        }
+    }
+}