/**
 * Copyright (C) FuseSource, Inc.
 * http://fusesource.com
 *
 * Licensed 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.fusesource.insight.graph.support;

import com.googlecode.jmxtrans.model.output.GraphiteWriter;
import org.codehaus.jackson.map.ObjectMapper;

import java.io.IOException;
import java.io.InputStream;

/**
 */
public class Json {
    public static <T> T readJsonValue(String name, InputStream in, Class<T> aClass) throws IOException {
        ObjectMapper mapper = new ObjectMapper();

        // lets tweak the class loader so we can find the classes
        ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        ClassLoader classLoader = GraphiteWriter.class.getClassLoader();
        Thread.currentThread().setContextClassLoader(classLoader);

        try {
            return mapper.readValue(in, aClass);
        } finally {
            Thread.currentThread().setContextClassLoader(oldClassLoader);
        }
    }
}