com.scudata.expression.mfn.sequence.Median Maven / Gradle / Ivy

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SPL(Structured Process Language) A programming language specially for structured data computing.
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package com.scudata.expression.mfn.sequence;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.dm.Sequence;
import com.scudata.expression.IParam;
import com.scudata.expression.SequenceFunction;
import com.scudata.resources.EngineMessage;
import com.scudata.util.Variant;

/**
 * median
 * 		A.median(k:n)
 * 		A.median(k:n, x)
 * ȡ??λ??????
 * ?Ȱ?????Դ??С????????Ȼ??Ѽ?¼?ֳɶ?Σ?ȡָ???εĵ?һ????¼ֵ
 * ????????Ϊ??????????????':'??','??????
 * ?ڶ???????Ϊ?????ķֶ???
 * ??һ??????Ϊȡ?ڼ????ֶεĵ?һ????¼
 * ??????????Ϊȡֵ????ʽ??Դ???и??ݸñ???ʽ??????µ????У???ִ?зֶ?ȡ????
 * 		A.median(k:n,x)?൱??A.(x).median(k:n)
 * ????	3??5 ??ʾ???????ļ?¼??Ϊ5?Σ?ȡ?????ε?һ????¼??ֵ??
 * 		????¼??ƽ?????????ķֶμ?¼??
 * 
 * ??????Ϊ?գ???Ϊȡ??λ????ȡֵ??ʽ???þ???ȡֵ?ķ?ʽ??
 * 			?Ѽ??㣬???????????У?????Ϊn?Σ????ص?k?ηֽ????ϵ?????
 * 
 * ??֧??sequence????Դ
 * 
 * @author ??־??
 *
 */
public class Median extends SequenceFunction  {
	public Object calculate(Context ctx) {		
		if (param == null) {
			return srcSequence.median(0, 0);
		} 
		
		int value1=-1, value2=-1;
		char type = param.getType();
		if (type == IParam.Colon) {		//???????? A.median(k:n)
			if (param.getSubSize() != 2) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}

			IParam sub0 = param.getSub(0);
			IParam sub1 = param.getSub(1);
			
			if (null != sub0 && !sub0.isLeaf()) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}
			
			if (null != sub1 && !sub1.isLeaf()) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}

			try {
				if (null != sub0) {
					value1 = (int)Variant.longValue(sub0.getLeafExpression().calculate(ctx));
					// ????һ????С??1
					if (value1 < 1) {
						MessageManager mm = EngineMessage.get();
						throw new RQException("median" + mm.getMessage("function.invalidParam"));
					}
				}
				if (null != sub1) {
					value2 = (int)Variant.longValue(sub1.getLeafExpression().calculate(ctx));
					// ?????????????1???Ҵ??ڲ???һ??
					if (value2 < 1 || value1 > value2 ){
						MessageManager mm = EngineMessage.get();
						throw new RQException("median" + mm.getMessage("function.invalidParam"));
					}
				}
				
				// ????????Ϊȱʡֵ??????һ????ҲΪȱʡֵ??
				if (-1 == value2 && -1 != value1) {
					MessageManager mm = EngineMessage.get();
					throw new RQException("median" + mm.getMessage("function.invalidParam"));
				}
				
				if (-1 == value1)
					value1 = 0;
				if (-1 == value2)
					value2 = 0;
			} catch (Exception e) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}
			
			return srcSequence.median(value1, value2);
		} else if (type == IParam.Comma ) {		// ???????? A.median(k:n, x)
			if (param.getSubSize() != 2) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}

			IParam sub0 = param.getSub(0);
			IParam sub1 = param.getSub(1);
			
			// ???зָ?????x????Ϊ??
			if ((null != sub1 && !sub1.isLeaf()) || null == sub1) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}
			// ?зָ????? ?ͱ????зָ???:
			if (null != sub0 && sub0.getSubSize() != 2) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}
			
			IParam sub00 = null;
			IParam sub01 = null;
			if (sub0 != null) {
				sub00 = sub0.getSub(0);
				sub01 = sub0.getSub(1);
			}
			
			if (null != sub00 && !sub00.isLeaf()) {	// k??????Ҷ????
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}
			if (null != sub01 && !sub01.isLeaf()) {	// n??????Ҷ????
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}

			Sequence seq = null;	// ???о???????ʽx??????????
			try {
				// ?????м??????ʽx
				seq = srcSequence.calc(sub1.getLeafExpression(), "o", ctx);
				
				if (null != sub00) {
					value1 = (int)Variant.longValue(sub00.getLeafExpression().calculate(ctx));
					// ????һ????С??1
					if (value1 < 1) {
						MessageManager mm = EngineMessage.get();
						throw new RQException("median" + mm.getMessage("function.invalidParam"));
					}
				}
				if (null != sub01) {
					value2 = (int)Variant.longValue(sub01.getLeafExpression().calculate(ctx));
					// ?????????????1???Ҵ??ڲ???һ??
					if (value2 < 1 || value1 > value2 ){
						MessageManager mm = EngineMessage.get();
						throw new RQException("median" + mm.getMessage("function.invalidParam"));
					}
				}
				
				// ????????Ϊȱʡֵ??????һ????ҲΪȱʡֵ??
				if (-1 == value2 && -1 != value1) {
					MessageManager mm = EngineMessage.get();
					throw new RQException("median" + mm.getMessage("function.invalidParam"));
				}
				
				if (-1 == value1)
					value1 = 0;
				if (-1 == value2)
					value2 = 0;
			} catch (Exception e) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("median" + mm.getMessage("function.invalidParam"));
			}
			
			// ȡ??????ֵ
			return seq.median(value1, value2);
		} else {
			MessageManager mm = EngineMessage.get();
			throw new RQException("median" + mm.getMessage("function.invalidParam"));
		}
	}
}