JolokiaHelpers.java

/**
 *  Copyright 2005-2016 Red Hat, Inc.
 *
 *  Red Hat 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 io.fabric8.jolokia.support;

import com.fasterxml.jackson.databind.ObjectMapper;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

import java.io.IOException;
import java.lang.reflect.Array;

/**
 * Factory method of JMX MBean proxies for working with Fabric
 */
public class JolokiaHelpers {
    private static ObjectMapper objectMapper = new ObjectMapper();

    public static Object convertJolokiaToJavaType(Class<?> clazz, Object value) throws IOException {
        if (clazz.isArray()) {
            if (value instanceof JSONArray) {
                JSONArray jsonArray = (JSONArray) value;
                Object[] javaArray = (Object[]) Array.newInstance(clazz.getComponentType(), jsonArray.size());
                int idx = 0;
                for (Object element : jsonArray) {
                    Array.set(javaArray, idx++, convertJolokiaToJavaType(clazz.getComponentType(), element));
                }
                return javaArray;
            } else {
                return null;
            }
        } else if (String.class.equals(clazz)) {
            return (value != null) ? value.toString() : null;
        } else if (clazz.equals(Byte.class) || clazz.equals(byte.class)) {
            Number number = asNumber(value);
            return number != null ? number.byteValue() : null;
        } else if (clazz.equals(Short.class) || clazz.equals(short.class)) {
            Number number = asNumber(value);
            return number != null ? number.shortValue() : null;
        } else if (clazz.equals(Integer.class) || clazz.equals(int.class)) {
            Number number = asNumber(value);
            return number != null ? number.intValue() : null;
        } else if (clazz.equals(Long.class) || clazz.equals(long.class)) {
            Number number = asNumber(value);
            return number != null ? number.longValue() : null;
        } else if (clazz.equals(Float.class) || clazz.equals(float.class)) {
            Number number = asNumber(value);
            return number != null ? number.floatValue() : null;
        } else if (clazz.equals(Double.class) || clazz.equals(double.class)) {
            Number number = asNumber(value);
            return number != null ? number.doubleValue() : null;
        } else if (value instanceof JSONObject) {
            JSONObject jsonObject = (JSONObject) value;
            if (!JSONObject.class.isAssignableFrom(clazz)) {
                String json = jsonObject.toJSONString();
                return getObjectMapper().readerFor(clazz).readValue(json);
            }
        }
        return value;
    }

    public static ObjectMapper getObjectMapper() {
        return objectMapper;
    }

    public static void setObjectMapper(ObjectMapper objectMapper) {
        JolokiaHelpers.objectMapper = objectMapper;
    }

    protected static Number asNumber(Object value) {
        if (value instanceof Number) {
            return (Number) value;
        } else {
            return null;
        }
    }
}