/*
 * 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.unomi.router.core.strategy;

import org.apache.camel.Exchange;
import org.apache.camel.processor.aggregate.AggregationStrategy;
import org.apache.unomi.router.api.ExportConfiguration;
import org.apache.unomi.router.api.RouterUtils;

/**
 * Created by amidani on 29/06/2017.
 */
public class StringLinesAggregationStrategy implements AggregationStrategy {

    public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
        Object newBody = newExchange.getIn().getBody(String.class);
        String lineSeparator = newExchange.getIn().getHeader("exportConfig", ExportConfiguration.class).getLineSeparator();
        if (oldExchange != null) {
            StringBuilder fileContent = new StringBuilder();
            fileContent.append(oldExchange.getIn().getBody(String.class));
            fileContent.append(RouterUtils.getCharFromLineSeparator(lineSeparator));
            fileContent.append(newBody);

            oldExchange.getIn().setBody(fileContent);
            return oldExchange;
        } else {
            return newExchange;
        }
    }
}
