printdatafunction.java

Java写的ERP系统

/******************************************************************************
 * The contents of this file are subject to the   Compiere License  Version 1.1
 * ("License"); You may not use this file except in compliance with the License
 * You may obtain a copy of the License at http://www.compiere.org/license.html
 * Software distributed under the License is distributed on an  "AS IS"  basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * The Original Code is                  Compiere  ERP & CRM  Business Solution
 * The Initial Developer of the Original Code is Jorg Janke  and ComPiere, Inc.
 * Portions created by Jorg Janke are Copyright (C) 1999-2002 Jorg Janke, parts
 * created by ComPiere are Copyright (C) ComPiere, Inc.;   All Rights Reserved.
 * Contributor(s): ______________________________________.
 *****************************************************************************/
package org.compiere.print;

import java.math.*;
import org.compiere.util.*;

/**
 *	Print Data Function
 *
 * 	@author 	Jorg Janke
 * 	@version 	$Id: PrintDataFunction.java,v 1.3 2002/11/02 06:06:01 jjanke Exp $
 */
public class PrintDataFunction
{
	/**
	 *	Constructor
	 */
	public PrintDataFunction ()
	{
	}	//	PrintDataFunction

	/** The Sum				*/
	private BigDecimal	m_sum = Env.ZERO;
	/** The Count			*/
	private int			m_count = 0;
	/** Total Count			*/
	private int			m_totalCount = 0;


	static public final char		F_SUM = 'S';
	static public final char		F_AVERAGE = 'A';
	static public final char		F_COUNT = 'C';

	/** Function Keys							*/
	static private final char[]		FUNCTIONS = new char[]
		{F_SUM, F_AVERAGE, F_COUNT};
	/** Symbols									*/
	static private final String[]	FUNCTION_SYMBOLS = new String[]
		{" \u2211", " \u00D8", " \u2116"};
	/**	AD_Message Names of Functions			*/
	static private final String[]	FUNCTION_NAMES = new String[]
		{"Sum", "Average", "Count"};

	/**
	 * 	Add Value to Counter
	 * 	@param bd data
	 */
	public void addValue (BigDecimal bd)
	{
		if (bd != null)
		{
			m_sum = m_sum.add(bd);
			m_count++;
		}
		m_totalCount++;
	}	//	addValue

	/**
	 * 	Get Function Value
	 *  @param function function
	 *  @return function value
	 */
	public BigDecimal getValue(char function)
	{
		if (function == F_SUM)
			return m_sum;
		BigDecimal count = new BigDecimal((double)m_count);
		if (function == F_COUNT)
			return count;
		//	Average
		if (m_count == 0)
			return Env.ZERO;
		BigDecimal result = m_sum.divide(count, BigDecimal.ROUND_HALF_UP);
		if (result.scale() > 4)
			result = result.setScale(4, BigDecimal.ROUND_HALF_UP);
		return result;
	}	//	getValue

	/**
	 * 	Reset Value
	 */
	public void reset()
	{
		m_count = 0;
		m_totalCount = 0;
		m_sum = Env.ZERO;
	}	//	reset

	/**
	 * 	String Representation
	 * 	@return info
	 */
	public String toString()
	{
		StringBuffer sb = new StringBuffer("[");
		sb.append("Count=").append(m_count).append(",Sum=").append(m_sum);
		sb.append("]");
		return sb.toString();
	}	//	toString

	/*************************************************************************/

	/**
	 * 	Get Function Symbol of function
	 * 	@param function function
	 * 	@return function symbol
	 */
	static public String getFunctionSymbol (char function)
	{
		for (int i = 0; i < FUNCTIONS.length; i++)
		{
			if (FUNCTIONS[i] == function)
				return FUNCTION_SYMBOLS[i];
		}
		return "UnknownFunction=" + function;
	}	//	getFunctionSymbol

	/**
	 * 	Get Function Name of function
	 * 	@param function function
	 * 	@return function name
	 */
	static public String getFunctionName (char function)
	{
		for (int i = 0; i < FUNCTIONS.length; i++)
		{
			if (FUNCTIONS[i] == function)
				return FUNCTION_NAMES[i];
		}
		return "UnknownFunction=" + function;
	}	//	getFunctionName

	/**
	 * 	Get Funcuion Name of function
	 * 	@param function function
	 * 	@return function name
	 */
	static public int getFunctionDisplayType (char function)
	{
		if (function == F_SUM)
			return DisplayType.Amount;
		if (function == F_COUNT)
			return DisplayType.Integer;
		//	Average
		return DisplayType.Number;
	}	//	getFunctionName

}	//	PrintDataFunction