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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 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;

/**
 * ??????ʽ?????ַ???
 * format (s,??) ???ɴ???????ʾs?Ĳ?????ͨ??Java??ʽ??????ʹ???????͵?????ת????һ???ַ?????
 * @author runqian
 *
 */
public class Format extends Function {
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("format" + mm.getMessage("function.missingParam"));
		} else if (param.isLeaf()) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("format" + mm.getMessage("function.invalidParam"));
		}
	}

	public Object calculate(Context ctx) {
		IParam sub0 = param.getSub(0);
		if (sub0 == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("format" + mm.getMessage("function.invalidParam"));
		}
		
		Object obj = sub0.getLeafExpression().calculate(ctx);
		String fmt;
		if (obj instanceof String) {
			fmt = (String)obj;
		} else if (obj != null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("format" + mm.getMessage("function.paramTypeError"));
		} else {
			return null;
		}
		
		int size = param.getSubSize();
		Object []args = new Object[size - 1];
		for (int i = 1; i < size; ++i) {
			IParam sub = param.getSub(i);
			if (sub != null) {
				args[i - 1] = sub.getLeafExpression().calculate(ctx);
			}
		}
		
		return String.format(fmt, args);
	}
}