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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.index.mapper;

import java.util.Collection;

enum MapperUtils {
    ;

    /**
     * Splits the provided mapper and its descendants into object, field, and field alias mappers.
     */
    public static void collect(Mapper mapper, Collection objectMappers,
                               Collection fieldMappers,
                               Collection fieldAliasMappers) {
        if (mapper instanceof RootObjectMapper) {
            // root mapper isn't really an object mapper
        } else if (mapper instanceof ObjectMapper) {
            objectMappers.add((ObjectMapper)mapper);
        } else if (mapper instanceof FieldMapper) {
            fieldMappers.add((FieldMapper)mapper);
        } else if (mapper instanceof FieldAliasMapper) {
            fieldAliasMappers.add((FieldAliasMapper) mapper);
        } else {
            throw new IllegalStateException("Unrecognized mapper type [" +
                mapper.getClass().getSimpleName() + "].");
        }


        for (Mapper child : mapper) {
            collect(child, objectMappers, fieldMappers, fieldAliasMappers);
        }
    }
}