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/*
 *
 *  Copyright 2016 Netflix, 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.netflix.metacat.client.module;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;

import java.lang.reflect.Type;

/**
 * Encoder for Metacat request.
 *
 * @author amajumdar
 */
public class JacksonEncoder implements Encoder {
    private final ObjectMapper mapper;

    /**
     * Constructor.
     *
     * @param mapper Jackson mapper for Metacat request
     */
    public JacksonEncoder(final ObjectMapper mapper) {
        this.mapper = mapper;
    }

    /**
     * Converts objects to an appropriate representation in the template.
     *
     * @param object   what to encode as the request body.
     * @param bodyType the type the object should be encoded as. {@code Map}, if form
     *                 encoding.
     * @param template the request template to populate.
     * @throws feign.codec.EncodeException when encoding failed due to a checked exception.
     */
    @Override
    public void encode(final Object object, final Type bodyType, final RequestTemplate template)
        throws EncodeException {
        try {
            template.body(mapper.writeValueAsString(object));
        } catch (JsonProcessingException e) {
            throw new EncodeException(e.getMessage(), e);
        }
    }
}