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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.common.xcontent.support;

import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentGenerator;
import org.elasticsearch.common.xcontent.XContentParser;

import java.io.IOException;
import java.util.*;

/**
 * @author kimchy (shay.banon)
 */
public class XContentMapConverter {

    public static interface MapFactory {
        Map newMap();
    }

    public static final MapFactory SIMPLE_MAP_FACTORY = new MapFactory() {
        @Override public Map newMap() {
            return new HashMap();
        }
    };

    public static final MapFactory ORDERED_MAP_FACTORY = new MapFactory() {
        @Override public Map newMap() {
            return new LinkedHashMap();
        }
    };

    public static Map readMap(XContentParser parser) throws IOException {
        return readMap(parser, SIMPLE_MAP_FACTORY);
    }

    public static Map readOrderedMap(XContentParser parser) throws IOException {
        return readMap(parser, ORDERED_MAP_FACTORY);
    }

    public static Map readMap(XContentParser parser, MapFactory mapFactory) throws IOException {
        Map map = mapFactory.newMap();
        XContentParser.Token t = parser.currentToken();
        if (t == null) {
            t = parser.nextToken();
        }
        if (t == XContentParser.Token.START_OBJECT) {
            t = parser.nextToken();
        }
        for (; t == XContentParser.Token.FIELD_NAME; t = parser.nextToken()) {
            // Must point to field name
            String fieldName = parser.currentName();
            // And then the value...
            t = parser.nextToken();
            Object value = readValue(parser, mapFactory, t);
            map.put(fieldName, value);
        }
        return map;
    }

    private static List