com.sun.enterprise.universal.PropertiesDecoder Maven / Gradle / Ivy
/*
* Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.enterprise.universal;
import java.util.*;
/**
*
* @author Byron Nevins
*/
public class PropertiesDecoder {
/**
* There are several CLI commands that take properties arguments. The properties
* are "flattened". This class will unflatten them back into a Map for you.
* Example Input: foo=goo:xyz:hoo=ioo
*
Output would be 3 pairs:
*
* - foo, goo
*
- xyz, null
*
- hoo, ioo
*
* @param props The flattened string properties
* @return A Map of the String keys and values. It will return an
*/
public static Map unflatten(final String s) {
if(!ok(s))
return Collections.emptyMap();
Map map = new HashMap();
String[] elements = s.split(":");
for(String element : elements) {
addPair(map, element);
}
return map;
}
private static void addPair(Map map, String element) {
// TODO this method is a perfect candidate for unit tests...
// note: It is quite tricky and delicate finding every possible weirdness
// that a user is capable of!
// element is one of these:
// 0. ""
// 1. "foo"
// 2. "foo=goo"
// 3. "foo="
// if we get garbage like a=b=c=d we change to "a", "b=c=d"
// 0.
if(!ok(element))
return; // no harm, no foul
int index = element.indexOf("=");
// 1.
if(index < 0)
map.put(element, null);
// 3.
else if(element.length() - 1 <= index ) {
// lose the '='
map.put(element.substring(0, index), null);
}
// 2
else // guarantee: at least one char after the '='
map.put(element.substring(0, index), element.substring(index + 1));
}
private static boolean ok(String s) {
return s != null && s.length() > 0;
}
}