com.nextdoor.bender.operation.json.array.ArraySplitOperation.java Source code

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Here is the source code for com.nextdoor.bender.operation.json.array.ArraySplitOperation.java

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/*
 * Licensed 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.
 *
 * Copyright 2017 Nextdoor.com, Inc
 *
 */

package com.nextdoor.bender.operation.json.array;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.nextdoor.bender.InternalEvent;
import com.nextdoor.bender.deserializer.DeserializedEvent;
import com.nextdoor.bender.deserializer.FieldNotFoundException;
import com.nextdoor.bender.deserializer.json.GenericJsonEvent;
import com.nextdoor.bender.operation.MultiplexOperation;
import com.nextdoor.bender.operation.OperationException;

public class ArraySplitOperation implements MultiplexOperation {
    private final String path;

    public ArraySplitOperation(String path) {
        this.path = path;
    }

    @Override
    public List<InternalEvent> perform(InternalEvent ievent) throws OperationException {
        {
            if (ievent.getEventObj() == null) {
                throw new OperationException("Deserialized object is null");
            }

            Object payload;
            try {
                payload = ievent.getEventObj().getField(this.path);
            } catch (FieldNotFoundException e) {
                throw new OperationException(e);
            }

            if (!(payload instanceof JsonArray)) {
                throw new OperationException("Payload data is not a JsonArray");
            }

            LinkedHashMap<String, String> partitions = ievent.getPartitions();

            JsonArray arr = (JsonArray) payload;

            ArrayList<InternalEvent> output = new ArrayList<InternalEvent>();
            for (JsonElement elm : arr) {
                try {
                    InternalEvent newEvent = new InternalEvent(elm.toString(), ievent.getCtx(),
                            ievent.getArrivalTime());
                    DeserializedEvent newDeserEvent = new GenericJsonEvent(elm.getAsJsonObject());
                    newEvent.setEventObj(newDeserEvent);
                    newEvent.setEventTime(ievent.getEventTime());

                    /*
                     * Deep clone the partitions
                     */
                    if (partitions != null) {
                        LinkedHashMap<String, String> newPartitions = new LinkedHashMap<String, String>(
                                partitions.size());

                        partitions.entrySet().forEach(kv -> {
                            newPartitions.put(new String(kv.getKey()), new String(kv.getValue()));
                        });

                        newEvent.setPartitions(newPartitions);
                    }

                    output.add(newEvent);
                } catch (Exception e) {
                    throw new OperationException(e);
                }
            }

            return output;
        }
    }
}