/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package org.apache.hc.core5.jackson2.http;

import java.io.IOException;
import java.io.OutputStream;

import com.fasterxml.jackson.databind.ObjectMapper;

import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.util.Args;

/**
 * {@link org.apache.hc.core5.http.nio.AsyncEntityProducer} implementation that
 * generates a message body containing serialized content of the given JSON object.
 *
 * @param <T> type of objects used by this class.
 * @since 5.5
 */
public class JsonObjectEntityProducer<T> extends AbstractJsonEntityProducer {

    private final T jsonObject;
    private final ObjectMapper objectMapper;

    /**
     * Creates a new instance that serializes the given object using the specified content type.
     * If {@code contentType} is {@code null}, defaults to {@code application/json}.
     *
     * @param jsonObject   the object to serialize.
     * @param objectMapper the object mapper.
     * @param contentType  the content type, or {@code null} for {@code application/json}.
     * @since 5.5
     */
    public JsonObjectEntityProducer(final T jsonObject, final ObjectMapper objectMapper, final ContentType contentType) {
        super(4096, contentType);
        this.jsonObject = Args.notNull(jsonObject, "Json object");
        this.objectMapper = Args.notNull(objectMapper, "Object mapper");
    }

    public JsonObjectEntityProducer(final T jsonObject, final ObjectMapper objectMapper) {
        this(jsonObject, objectMapper, null);
    }

    @Override
    final void generateJson(final OutputStream outputStream) throws IOException {
        objectMapper.writeValue(outputStream, jsonObject);
        outputStream.close();
    }

    @Override
    public void failed(final Exception cause) {
    }

}
