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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.common;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.type.CollectionType;
import com.fasterxml.jackson.databind.type.TypeFactory;

import java.io.IOException;
import java.util.List;

public class ListOrSingleSerialiser extends JsonSerializer> {

    @Override
    public void serialize(ListOrSingle value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {
        if (value.isEmpty()) {
            gen.writeStartArray();
            gen.writeEndArray();
            return;
        }

        Object firstValue = value.getFirst();
        if (value.isSingle()) {
            JsonSerializer serializer = serializers.findValueSerializer(firstValue.getClass());
            serializer.serialize(firstValue, gen, serializers);
        } else {
            CollectionType type = TypeFactory.defaultInstance().constructCollectionType(List.class, firstValue.getClass());
            JsonSerializer serializer = serializers.findValueSerializer(type);
            serializer.serialize(value, gen, serializers);
        }
    }
}