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Apache Oltu JSON shared utility

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/*
 * 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.
 */
package org.apache.oltu.commons.json;

import java.util.LinkedHashMap;
import java.util.Map;

public abstract class CustomizableBuilder {

    /**
     * The registry that keeps the custom fields.
     */
    private final Map customFields = new LinkedHashMap();

    protected final Map getCustomFields() {
        return customFields;
    }

    /**
     * TODO
     *
     * @param key
     * @param value
     * @return
     */
    public final CustomizableBuilder setCustomField(String key, Object value) {
        if (key == null) {
            throw new IllegalArgumentException("Null key not allowed.");
        }
        if (value != null) {
            customFields.put(key, value);
        }
        return this;
    }

    public abstract E build();

}