sparksoniq.jsoniq.runtime.iterator.postfix.ObjectLookupClosure Maven / Gradle / Ivy

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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.
 *
 * Authors: Stefan Irimescu, Can Berker Cikis
 *
 */

package sparksoniq.jsoniq.runtime.iterator.postfix;

import org.apache.spark.api.java.function.FlatMapFunction;
import org.rumbledb.api.Item;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ObjectLookupClosure implements FlatMapFunction {

	private static final long serialVersionUID = 1L;
	private final String _key;

    public ObjectLookupClosure(String key) {
        _key = key;
    }

    public Iterator call(Item arg0) throws Exception {
        List results = new ArrayList();

        if (!(arg0.isObject()))
            return results.iterator();

        Item item = arg0.getItemByKey(_key);
        if (item != null) {
            results.add(item);
        }
        return results.iterator();
    }
};