| /******************************************************************************* |
| * Copyright (c) 2004, 2015 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * Jan-Ove Weichel (janove.weichel@vogella.com) - bug 474359 |
| *******************************************************************************/ |
| package org.eclipse.core.internal.preferences; |
| |
| import java.util.*; |
| import java.util.Map.Entry; |
| |
| /** |
| * A {@link Properties} class whose entries are sorted by key; can <strong>only</strong> be used in limited scenarios |
| * like storing properties to a file. |
| * <p> |
| * <b>Implementation note</b>: The implementations of the {@link #keys()} and {@link #entrySet()} methods |
| * violate the contracts of {@link Properties#keySet()} and {@link Properties#entrySet()}, because the returned sets |
| * are <em>not</em> backed by this map. |
| * Overriding both methods is necessary to support Oracle and IBM VMS, see |
| * <a href="https://bugs.eclipse.org/325000">bug 325000</a>. |
| * </p> |
| */ |
| public class SortedProperties extends Properties { |
| // Warning: This class is referenced by our friend org.eclipse.core.internal.resources.ProjectPreferences |
| |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public synchronized Enumeration<Object> keys() { |
| TreeSet<Object> set = new TreeSet<>(); |
| for (Enumeration<?> e = super.keys(); e.hasMoreElements();) { |
| set.add(e.nextElement()); |
| } |
| return Collections.enumeration(set); |
| } |
| |
| @Override |
| public Set<Entry<Object, Object>> entrySet() { |
| TreeSet<Entry<Object, Object>> set = new TreeSet<>((Entry<Object, Object> e1, Entry<Object, Object> e2) -> { |
| String s1 = (String) e1.getKey(); |
| String s2 = (String) e2.getKey(); |
| return s1.compareTo(s2); |
| }); |
| for (Iterator<Entry<Object, Object>> i = super.entrySet().iterator(); i.hasNext();) { |
| set.add(i.next()); |
| } |
| return set; |
| } |
| } |