FlatFileItemWriter more than one lineAggregators

[kurniled]

Hi I have some question about Spring Batch 2.0

in FlatFileItemWriter can I have more than one lineAggregators?
coz in my case is :
if found items = header then use HeaderAggregator
if found items = data then use DataAggregator
if found items = trailer then user TrailerAggregator

Any suggestion? thx

[DHGarrette]

Use the composite pattern to create composite line aggregator. This example comes from the samples:

public class DelegatingTradeLineAggregator implements LineAggregator<Object> {
    private LineAggregator<Trade> tradeLineAggregator;
    private LineAggregator<CustomerCredit> customerLineAggregator;

    public String aggregate(Object item) {
        if (item instanceof Trade) {
            return this.tradeLineAggregator.aggregate((Trade) item);
        }
        else if (item instanceof CustomerCredit) {
            return this.customerLineAggregator.aggregate((CustomerCredit) item);
        }
        else {
            throw new RuntimeException();
        }
    }
}

[kurniled]

Hi DHGarrette thank you for your quick response.