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Cassandra Lucene Index builder

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/*
 * Copyright (C) 2014 Stratio (http://stratio.com)
 *
 * 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.stratio.cassandra.lucene.builder;


import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;

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

/**
 * Abstract builder for creating JSON documents.
 *
 * @author Andres de la Pena {@literal }
 */
public abstract class JSONBuilder {

    /** The embedded JSON serializer. */
    private static final ObjectMapper mapper = new ObjectMapper();

    static {
        mapper.configure(JsonGenerator.Feature.QUOTE_FIELD_NAMES, true);
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        mapper.configure(MapperFeature.AUTO_DETECT_IS_GETTERS, false);
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, true);
        mapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return build();
    }

    /**
     * Returns the JSON {@code String} representation of the specified object.
     *
     * @return a JSON {@code String}
     */
    public String build() {
        try {
            return mapper.writeValueAsString(this);
        } catch (IOException e) {
            throw new BuilderException(e, "Error formatting JSON");
        }
    }

    @SafeVarargs
    protected static  List add(List l, T... a) {
        if (l == null) {
            l = new ArrayList<>(a.length);
        }
        l.addAll(Arrays.asList(a));
        return l;
    }
}