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A set of utilities for Java

There is a newer version: 3.0.0

package org.rx.bean;

import org.rx.core.Constants;
import org.rx.core.Extends;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

@SuppressWarnings(Constants.NON_UNCHECKED)
public class AbstractAttributes implements Extends {
    private static final long serialVersionUID = -800222176830684588L;
    private Map attrs;

    protected  Map initialAttrs() {
        return new ConcurrentHashMap<>();
    }

    @Override
    public  TV attr(TK key) {
        if (attrs == null) {
            return null;
        }
        return (TV) attrs.get(key);
    }

    @Override
    public  void attr(TK key, TV value) {
        if (attrs == null) {
            if (value == null) {
                return;
            }
            attrs = initialAttrs();
        }
        if (value == null) {
            attrs.remove(key);
        } else {
            attrs.put(key, value);
        }
    }
}