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/*******************************************************************************
* 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<>(new Comparator<Entry<Object, Object>>() {
@Override
public int compare(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;
}
}
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