/
SortedProperties.java
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/
SortedProperties.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.collections4.properties;
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.stream.Collectors;
import org.apache.commons.collections4.iterators.IteratorEnumeration;
/**
* A drop-in replacement for {@link Properties} for sorting keys.
* <p>
* Overrides {@link Properties#keys()} to sort keys. Allows other methods on the superclass to work with sorted keys.
* </p>
*
* @since 4.2
*/
public class SortedProperties extends Properties {
private static final long serialVersionUID = 1L;
@Override
public synchronized Enumeration<Object> keys() {
return new IteratorEnumeration<>(keySet().stream().map(Object::toString).sorted().collect(Collectors.toList()).iterator());
}
@Override
public Set<Map.Entry<Object, Object>> entrySet() {
final Enumeration<Object> keys = keys();
final Set<Map.Entry<Object, Object>> entrySet = new LinkedHashSet<>();
while (keys.hasMoreElements()) {
final Object key = keys.nextElement();
entrySet.add(new AbstractMap.SimpleEntry<>(key, getProperty((String) key)));
}
return entrySet;
}
}