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    • com.github.simy4.xpath.helpers.OrderedProperties Maven / Gradle / Ivy

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    package com.github.simy4.xpath.helpers;

import java.util.Collections;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

/**
 * Properties that preserves the order in which they were read from the file.
 *
 * @author Alex Simkin
 */
public class OrderedProperties extends Properties {

    private static final long serialVersionUID = 1L;

    private final Set keys = new LinkedHashSet<>();

    /**
     * Transforms properties to linked hash map.
     *
     * @return linked hash map of property values
     */
    public synchronized Map toMap() {
        Map map = new LinkedHashMap<>(keys.size());
        for (Object orderedKey : keys) {
            map.put(String.valueOf(orderedKey), get(orderedKey));
        }
        return map;
    }

    @Override
    public synchronized Enumeration keys() {
        return Collections.enumeration(keys);
    }

    @Override
    public synchronized Object put(Object key, Object value) {
        keys.add(key);
        return super.put(key, value);
    }

    @Override
    public synchronized Object remove(Object key) {
        keys.remove(key);
        return super.remove(key);
    }

}
    
    
    
    

    




    
    
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