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Devebot Opflow for Java
There is a newer version: 0.1.3
package com.devebot.opflow;

import com.google.gson.Gson;
import com.rabbitmq.client.AMQP;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import com.devebot.opflow.exception.OpflowOperationException;

/**
 *
 * @author drupalex
 */
public class OpflowUtil {
    private static final Gson gson = new Gson();
    
    public static byte[] getBytes(String data) {
        if (data == null) return null;
        try {
            return data.getBytes("UTF-8");
        } catch (UnsupportedEncodingException exception) {
            throw new OpflowOperationException(exception);
        }
    }
    
    public static String getString(byte[] data) {
        if (data == null) return null;
        try {
            return new String(data, "UTF-8");
        } catch (UnsupportedEncodingException exception) {
            throw new OpflowOperationException(exception);
        }
    }
    
    public static Map cloneParameters(Map params) {
        Map clonedParams = new HashMap();
        for (String i : params.keySet()) {
            Object value = params.get(i);
            clonedParams.put(i, value);
        }
        return clonedParams;
    }
    
    public static  boolean arrayContains(final T[] array, final T v) {
        if (v == null) {
            for (final T e : array) if (e == null) return true;
        } else {
            for (final T e : array) if (e == v || v.equals(e)) return true;
        }
        return false;
    }
    
    public interface MapListener {
        public void transform(Map opts);
    }
    
    public static String buildJson(MapListener listener) {
        Map jsonMap = new HashMap();
        if (listener != null) {
            listener.transform(jsonMap);
        }
        return gson.toJson(jsonMap);
    }
    
    public static Map buildOptions(MapListener listener) {
        return buildOptions(listener, null);
    }
    
    public static Map buildOptions(MapListener listener, Map defaultOpts) {
        Map jsonMap = new HashMap();
        if (listener != null) {
            listener.transform(jsonMap);
        }
        return jsonMap;
    }
    
    public static Map ensureNotNull(Map opts) {
        return (opts == null) ? new HashMap() : opts;
    }
    
    public static Map getHeaders(AMQP.BasicProperties properties) {
        if (properties != null && properties.getHeaders() != null) {
            return properties.getHeaders();
        } else {
            return new HashMap();
        }
    }
}