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SPL(Structured Process Language) A programming language specially for structured data computing.

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package com.scudata.expression.fn.convert;

import java.math.BigDecimal;
import com.ibm.icu.text.DecimalFormat;
import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.expression.Function;
import com.scudata.expression.IParam;
import com.scudata.resources.EngineMessage;
import com.scudata.util.Variant;

/**
 * ???ַ???ת??????Ӧ??ʵ??
 * number( x )??number( x, y )
 * number( x, "format" )????ڶ????????Ǵ???????ʽ
 * ???x??ת?????ͷ?????????????ܣ?ûy??y????????ʱ?򷵻?null?????򷵻?y
 * @author runqian
 *
 */
public class ToNumber extends Function {
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("number" + mm.getMessage("function.missingParam"));
		}
	}

	public Object calculate(Context ctx) {
		if (param.isLeaf()) {
			Object result = param.getLeafExpression().calculate(ctx);
			if (result instanceof String) {
				return Variant.parseNumber((String)result);
			} else if (result instanceof Number) {
				return result;
			} else {
				return null;
			}
		} else {
			if (param.getSubSize() != 2) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("number" + mm.getMessage("function.invalidParam"));
			}
			
			IParam sub1 = param.getSub(0);
			IParam sub2 = param.getSub(1);
			if (sub1 == null || sub2 == null) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("number" + mm.getMessage("function.invalidParam"));
			}
			
			Object result1 = sub1.getLeafExpression().calculate(ctx);
			Object result2 = sub2.getLeafExpression().calculate(ctx);
			
			if (result1 instanceof String) {
				if (result2 instanceof String) {
					try {
						DecimalFormat nf = new DecimalFormat((String)result2);
						nf.setRoundingMode(BigDecimal.ROUND_HALF_UP);
						return nf.parse((String)result1);
					} catch (Exception e) {
					}
				}
				
				Object result = Variant.parse((String)result1);
				if (result instanceof Number) {
					return result;
				}
			} else if (result1 instanceof Number) {
				return result1;
			}
			
			if (result2 instanceof Number) {
				return result2;
			} else {
				return null;
			}
		}
	}
}