IDataSetProcessor.java from BIRT at Krugle

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/***********************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Actuate Corporation - initial API and implementation
 ***********************************************************************/

package org.eclipse.birt.chart.datafeed;

import java.util.Locale;

import org.eclipse.birt.chart.exception.ChartException;
import org.eclipse.birt.chart.model.data.DataSet;

import com.ibm.icu.util.ULocale;

/**
 * Provides a generic definition of a data set processor capable of building or
 * scanning through data sets associated with specific series types.
 */
public interface IDataSetProcessor
{

	/**
	 * Attempts to parse a line of text representing multiple values of a
	 * specific data element type and updates an existing data set or creates a
	 * new data set filled with these values.
	 * 
	 * @param sDataSetRepresentation
	 *            A line of text containing a list of data element values that
	 *            may be parsed.
	 * @param ds
	 *            An existing data set (or null for a new one) that needs to be
	 *            filled with data elements created by parsing the line of text
	 *            as per the expected string format.
	 * 
	 * @return The existing data set definition passed in as an argument or a
	 *         new one if the 'ds' argument was null
	 * @throws ChartException
	 */
	public DataSet fromString( String sDataSetRepresentation, DataSet ds )
			throws ChartException;

	/**
	 * Attempts to format a column of data to string. For example, an array
	 * Object[Double(1), Double(2)] will be converted into String "1,2"
	 * 
	 * @param columnData
	 *            array of column data. All elements have same class type.
	 * @throws ChartException
	 */
	public String toString( Object[] columnData ) throws ChartException;

	/**
	 * @return The expected format of a line of text that will be used by the
	 *         fromString(...) method to parse and create data elements to be
	 *         populated into a data set
	 */
	public String getExpectedStringFormat( );

	/**
	 * Populates a data set with data element values retrieved from a result set
	 * created as a result of query execution
	 * 
	 * @param oResultSetDef
	 *            An instance of a generic result set that is host application
	 *            specific. For BIRT, the result set class is ResultSetDataSet
	 * @param ds
	 *            An existing data set (or null for a new one) that needs to be
	 *            filled with with data elements extracted from the result set
	 *            definition
	 * 
	 * @return The existing data set definition passed in as an argument or a
	 *         new one if the 'ds' argument was null
	 * @throws ChartException
	 */
	public DataSet populate( Object oResultSetDef, DataSet ds )
			throws ChartException;

	/**
	 * Causes implementation specific data set processor classes to compute the
	 * minimum value in a data set of a specific series type.
	 * 
	 * @param ds
	 *            The data set for which the minimum value needs to be computed
	 * 
	 * @return The minimum value found in the data set
	 * @throws ChartException
	 */
	public Object getMinimum( DataSet ds ) throws ChartException;

	/**
	 * Causes implementation specific data set processor classes to compute the
	 * maximum value in a data set of a specific series type.
	 * 
	 * @param ds
	 *            The data set for which the maximum value needs to be computed
	 * 
	 * @return The maximum value found in the data set
	 * @throws ChartException
	 */
	public Object getMaximum( DataSet ds ) throws ChartException;

	/**
	 * Provides the locale to device renderer implementations as needed to
	 * retrieve localized resources for presentation.
	 * 
	 * @return The locale to be used
	 * @deprecated use {@link #getULocale()} instead.
	 * 
	 */
	public Locale getLocale( );

	/**
	 * Provides the locale to device renderer implementations as needed to
	 * retrieve localized resources for presentation.
	 * 
	 * @return The locale to be used
	 * @since 2.1
	 */
	public ULocale getULocale( );
}
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