org.apache.carbondata.processing.loading.parser.impl.MapParserImpl.java Source code

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Here is the source code for org.apache.carbondata.processing.loading.parser.impl.MapParserImpl.java

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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.carbondata.processing.loading.parser.impl;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;

import org.apache.carbondata.processing.loading.complexobjects.ArrayObject;

import org.apache.commons.lang.ArrayUtils;

public class MapParserImpl extends ArrayParserImpl {

    private String keyValueDelimiter;

    public MapParserImpl(String delimiter, String nullFormat, String keyValueDelimiter) {
        super(delimiter, nullFormat);
        this.keyValueDelimiter = keyValueDelimiter;
    }

    //The Key for Map will always be a PRIMITIVE type so Set<Object> here will work fine
    //Only the first occurance of key will be added and the remaining will be skipped/ignored
    @Override
    public ArrayObject parse(Object data) {
        if (data != null) {
            String value = data.toString();
            if (!value.isEmpty() && !value.equals(nullFormat)) {
                String[] split = pattern.split(value, -1);
                if (ArrayUtils.isNotEmpty(split)) {
                    ArrayList<Object> array = new ArrayList<>();
                    Set<Object> set = new HashSet<>();
                    for (int i = 0; i < split.length; i++) {
                        Object currKey = split[i].split(keyValueDelimiter)[0];
                        if (set.add(currKey)) {
                            array.add(child.parse(split[i]));
                        }
                    }
                    return new ArrayObject(array.toArray());
                }
            }
        }
        return null;
    }
}