JavaPackage.java

/* 
 *  Copyright (c) 2011-2012 Xamarin Inc.
 * 
 *  Permission is hereby granted, free of charge, to any person 
 *  obtaining a copy of this software and associated documentation 
 *  files (the "Software"), to deal in the Software without restriction, 
 *  including without limitation the rights to use, copy, modify, merge, 
 *  publish, distribute, sublicense, and/or sell copies of the Software, 
 *  and to permit persons to whom the Software is furnished to do so, 
 *  subject to the following conditions:
 * 
 *  The above copyright notice and this permission notice shall be 
 *  included in all copies or substantial portions of the Software.
 * 
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 
 *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
 *  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
 *  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
 *  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
 *  SOFTWARE.
 */

package jar2xml;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class JavaPackage implements Comparable<JavaPackage> {

	private String name;
	private ArrayList<JavaClass> classes;

	public JavaPackage (String name)
	{
		this.name = name;
		classes = new ArrayList <JavaClass> ();
	}

	public int compareTo (JavaPackage pkg)
	{
		return name.compareTo (pkg.name);
	}

	public String getName ()
	{
		return name;
	}

	public void addClass (JavaClass cls)
	{
		classes.add (cls);
	}

	public void appendToDocument (Document doc, Element parent)
	{
		Element e = doc.createElement ("package");
		e.setAttribute ("name", name);
		parent.appendChild (e);
		Collections.sort (classes);
		for (int i = 0; i < classes.size (); i++) {
			String name = classes.get (i).getName ();
			String body = getLastNameComponent (name);
			if (isObfuscatedName (body))
				classes.get (i).setObfuscated (true);
		}
		for (JavaClass c : classes)
			c.appendToDocument (doc, e);
	}
	
	static final String [] a_names = new String [] {
		"a", "aa", "aaa", "aaaa", "aaaaa"};
	
	boolean isObfuscatedName (String name)
	{
		boolean allA = true;
		for (char c : name.toCharArray ())
			if (c != 'a') {
				allA = false;
				break;
			}
		if (allA)
			return true;
		for (char c : name.toCharArray ())
			if (c != '$' && (c < 'a' || 'z' < c) && (c < '0' || '9' < c))
				return false;

		// There must be preceding 'a', 'aa' or {anything with only 'a' or '$' and matches the length}.
		// If there isn't such a class in this package, then the argument name is not likely obfuscated.
		//
		// This will save R.anim, R.id, Manifest.permission etc.
		//
		// (Comparison limited up to "aaaaa", there wouldn't be more than that)
		
		int length = name.length ();
		String allAString = a_names [length < 5 ? length - 1 : 4];
		
		for (int i = 0; i < classes.size (); i++) {
			String cname = classes.get (i).getName ();
			String body = getLastNameComponent (cname);
			if (body.equals (allAString)) {
				return true;
			}
		}
		return false;
	}
	
	static String getLastNameComponent (String name)
	{
		int idx = name.lastIndexOf ('$');
		idx = idx < 0 ? name.lastIndexOf ('.') : idx;
		return idx < 0 ? name : name.substring (idx + 1);
	}
}