AOO410/main/reportbuilder/java/com/sun/star/report/ReportAddIn.java

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 * to you under the Apache License, Version 2.0 (the
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package com.sun.star.report;

/**
 * A report add-in defines a set of expressions, which can
 * be used in the reporting.
 *
 * Each expression must provide meta-data to support GUI implementors.
 * Expressions are assumed to be statefull, if they are not, they are
 * free to be implemented as stateless expression.
 */
public interface ReportAddIn
{

    int getExpressionCount();

    ReportExpression createExpression(int expression);

    ReportExpressionMetaData getMetaData(int expression);
}