How to access item data (e.g. total # of records) in headerCallBack's write method?

[nikunj_c]

My Job is as below:

<job id="helloWorldJob">
    <step id="step1">
        <tasklet>
            <chunk reader="empReader" processor="empProcessor" writer="empHeaderFooterWriter" commit-interval="1000"/>
        </tasklet>
    </step>
</job>

My writer is as below:

<beans:bean id="empWriter" class="org.springframework.batch.item.file.FlatFileItemWriter">
    <beans:property name="resource" value="file:target/output_data.txt" />
    <beans:property name="lineAggregator">
        <beans:bean class="org.springframework.batch.item.file.transform.DelimitedLineAggregator">
            <beans:property name="delimiter" value=","/>
            <beans:property name="fieldExtractor">
                <beans:bean class="org.springframework.batch.item.file.transform.BeanWrapperFieldExtractor">
                    <beans:property name="names" value="empId,lastName,title,salary,rank"/>
                </beans:bean>
            </beans:property>
        </beans:bean>
    </beans:property>
    <beans:property name="footerCallback" ref="empHeaderFooterWriter" />
    <beans:property name="headerCallback" ref="empHeaderFooterWriter" />
</beans:bean>

<beans:bean id="empHeaderFooterWriter" class="com.test.EmployeeItemWriter">
    <beans:property name="delegate" ref="empWriter"/>
</beans:bean>

Now what I want to do is, I want to put the total number of records in the file in the Header (and not in footer).

How can I do that ??

Thanks,
Nik