com.scudata.expression.mfn.sequence.Delete 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.SequenceFunction;
import com.scudata.resources.EngineMessage;

/**
 * ɾ????????ָ??λ?ã????????λ?????У???Ԫ??
 * A.delete(k) A.delete(p)
 * @author RunQian
 *
 */
public class Delete extends SequenceFunction {
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("delete" + mm.getMessage("function.missingParam"));
		} else if (!param.isLeaf()) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("delete" + mm.getMessage("function.invalidParam"));
		}
	}
	
	public Object calculate(Context ctx) {
		Object obj = param.getLeafExpression().calculate(ctx);
		if (obj instanceof Number) {
			return srcSequence.delete(((Number)obj).intValue(), option);
		} else if (obj instanceof Sequence || obj == null) {
			return srcSequence.delete((Sequence)obj, option);
		} else {
			MessageManager mm = EngineMessage.get();
			throw new RQException("delete" + mm.getMessage("function.paramTypeError"));
		}
	}
}