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

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package com.scudata.dm;

/**
 * ???ڼ??????к???ʱ????ѹջ
 * @author WangXiaoJun
 *
 */
public class Current implements IComputeItem {
	private Sequence sequence;
	private int curIndex; // ??ǰ???????ڽ??м????Ԫ?ص?????????1??ʼ????
	private boolean isInStack = true; // ?Ƿ??ڼ????ջ??

	public Current(Sequence sequence) {
		this.sequence = sequence;
	}
	
	public Current(Sequence sequence, int index) {
		this.sequence = sequence;
		curIndex = index;
	}

	/**
	 * ???ص?ǰ???ڼ????Ԫ??
	 * @return Object
	 */
	public Object getCurrent() {
		return sequence.getCurrent(curIndex);
	}

	/**
	 * ???ص?ǰ???ڼ????Ԫ??????????1??ʼ????
	 * @return int
	 */
	public int getCurrentIndex() {
		return curIndex;
	}
	
	/**
	 * ȡԴ????
	 */
	public Sequence getCurrentSequence() {
		return sequence;
	}
	
	/**
	 * ?ж??????Ƿ??ڶ?ջ??
	 */
	public boolean isInStack(ComputeStack stack) {
		return isInStack;
	}
	
	/**
	 * ??????ɣ????г?ջ
	 */
	public void popStack() {
		isInStack = false;
	}
	
	/**
	 * ?жϵ?ǰ?????Ƿ?͸?????????ͬһ??????
	 * @param seq
	 * @return
	 */
	public boolean equalSequence(Sequence seq) {
		return sequence == seq;
	}

	/**
	 * ȡ???еĳ???
	 * @return
	 */
	public int length() {
		return sequence.length();
	}

	/**
	 * ?????ȡ???еĳ?Ա
	 * @param i ??ţ???1??ʼ????
	 * @return
	 */
	public Object get(int i) {
		return sequence.get(i);
	}

	/**
	 * ???õ?ǰ???ڼ????Ԫ??????
	 * @param index int ??1??ʼ????
	 */
	public void setCurrent(int index) {
		this.curIndex = index;
	}

	/**
	 * ?޸????еĵ?ǰԪ??Ϊָ??ֵ
	 * @param val
	 */
	public void assign(Object val) {
		sequence.set(curIndex, val);
	}

	/**
	 * ?޸?????ָ??λ?õ?Ԫ??
	 * @param index ??ţ???1??ʼ????
	 * @param val
	 */
	public void assign(int index, Object val) {
		sequence.set(index, val);
	}
	
	/**
	 * ȡ??ǰ??¼???ֶ?ֵ
	 * @param field
	 * @return
	 */
	public Object getFieldValue2(int field) {
		return sequence.getFieldValue2(curIndex, field);
	}
}