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/*
 * Copyright (C) 2014 jsonwebtoken.io
 *
 * 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 io.jsonwebtoken.jackson.io;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.jsonwebtoken.io.SerializationException;
import io.jsonwebtoken.io.Serializer;
import io.jsonwebtoken.lang.Assert;

/**
 * @since 0.10.0
 */
public class JacksonSerializer implements Serializer {

    static final ObjectMapper DEFAULT_OBJECT_MAPPER = new ObjectMapper();

    private final ObjectMapper objectMapper;

    @SuppressWarnings("unused") //used via reflection by RuntimeClasspathDeserializerLocator
    public JacksonSerializer() {
        this(DEFAULT_OBJECT_MAPPER);
    }

    @SuppressWarnings("WeakerAccess") //intended for end-users to use when providing a custom ObjectMapper
    public JacksonSerializer(ObjectMapper objectMapper) {
        Assert.notNull(objectMapper, "ObjectMapper cannot be null.");
        this.objectMapper = objectMapper;
    }

    @Override
    public byte[] serialize(T t) throws SerializationException {
        Assert.notNull(t, "Object to serialize cannot be null.");
        try {
            return writeValueAsBytes(t);
        } catch (JsonProcessingException e) {
            String msg = "Unable to serialize object: " + e.getMessage();
            throw new SerializationException(msg, e);
        }
    }

    @SuppressWarnings("WeakerAccess") //for testing
    protected byte[] writeValueAsBytes(T t) throws JsonProcessingException {
        return this.objectMapper.writeValueAsBytes(t);
    }
}