com.cisco.oss.foundation.directory.utils.JsonSerializer.java Source code

Introduction

Here is the source code for com.cisco.oss.foundation.directory.utils.JsonSerializer.java

Source

/**
 * Copyright 2014 Cisco Systems, Inc.
 *
 * 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 com.cisco.oss.foundation.directory.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.core.type.TypeReference;

/**
 * The JSON parser for serialization and deserialization.
 *
 * It wraps the Jackson ObjectMapper to handle the JSON parsing.
 *
 *
 */
public final class JsonSerializer {
    /**
     * The ObjectMapper object.
     */
    private final static ObjectMapper mapper = new ObjectMapper();

    /**
     * Constructor.
     */
    private JsonSerializer() {
    }

    /**
     * Deserialize from byte array.
     *
     * @param input
     *            the JSON String byte array.
     * @param classType
     *            the target Object class type.
     * @return the target Object instance.
     * @throws JsonParseException
     * @throws JsonMappingException
     * @throws IOException
     */
    public static <T> T deserialize(byte[] input, Class<T> classType)
            throws JsonParseException, JsonMappingException, IOException {
        return mapper.readValue(input, classType);
    }

    /**
     * Deserialize from byte array, it always used in the generic type object.
     *
     * @param input
     *            the JSON String byte array.
     * @param typeRef
     *            the target Object TypeReference.
     * @return the target Object instance.
     * @throws JsonParseException
     * @throws JsonMappingException
     * @throws IOException
     */
    public static <T> T deserialize(byte[] input, TypeReference<T> typeRef)
            throws JsonParseException, JsonMappingException, IOException {
        return mapper.readValue(input, typeRef);
    }

    /**
     * Serialize the Object to JSON String.
     *
     * @param instance
     *            the Object instance.
     * @return the JSON String byte array.
     * @throws JsonGenerationException
     * @throws JsonMappingException
     * @throws IOException
     */
    public static byte[] serialize(Object instance)
            throws JsonGenerationException, JsonMappingException, IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        mapper.writeValue(out, instance);
        return out.toByteArray();
    }

}