com.ysheng.auth.common.restful.util.JsonSerializer.java Source code

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Here is the source code for com.ysheng.auth.common.restful.util.JsonSerializer.java

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/*
 * Copyright 2016 Yu Sheng. All Rights Reserved.
 *
 * 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.ysheng.auth.common.restful.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;

import java.io.IOException;

/**
 * Defines a utility class that performs serialization operations
 * specifically for API client purposes.
 */
public class JsonSerializer {

    // The object mapper.
    private static final ObjectMapper objectMapper = new ObjectMapper();

    /**
     * Serializes an object to JSON string.
     *
     * @param object The object to be serialized.
     * @return A JSON string that contains the serialized object.
     * @throws JsonProcessingException The error that contains detail information.
     */
    public static HttpEntity serialize(Object object) throws JsonProcessingException {
        String serialized = objectMapper.writeValueAsString(object);

        return new StringEntity(serialized, ContentType.APPLICATION_JSON);
    }

    /**
     * Deserializes a JSON string to an object.
     *
     * @param serialized The JSON string that contains the serialized object.
     * @param typeReference The type reference of the object.
     * @param <T> The type of the object.
     * @return An object deserialized from the string.
     * @throws IOException The error that contains detail information.
     */
    public static <T> T deserialize(HttpEntity serialized, TypeReference<T> typeReference) throws IOException {
        if (typeReference.getType() == Void.TYPE) {
            return null;
        }

        return objectMapper.readValue(serialized.getContent(), typeReference);
    }
}