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package com.chenlb.mmseg4j.rule;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.chenlb.mmseg4j.Chunk;

/**
 * 过虑规则的抽象类。
 * 
 * @author chenlb 2009-3-16 上午11:35:06
 */
public abstract class Rule {

	protected List chunks;
	
	public void addChunks(List chunks) {
		for(Chunk chunk : chunks) {
			addChunk(chunk);
		}
	}
	
	/**
	 * 添加 chunk
	 * @throws NullPointerException, if chunk == null.
	 * @author chenlb 2009-3-16 上午11:34:17
	 */
	public void addChunk(Chunk chunk) {
		chunks.add(chunk);
	}
	
	/**
	 * @return 返回规则过虑后的结果。
	 * @author chenlb 2009-3-16 上午11:33:10
	 */
	public List remainChunks() {
		for(Iterator it=chunks.iterator(); it.hasNext();) {
			Chunk chunk = it.next();
			if(isRemove(chunk)) {
				it.remove();
			}
		}
		return chunks;
	}
	
	/**
	 * 判断 chunk 是否要删除。
	 * @author chenlb 2009-3-16 上午11:33:30
	 */
	protected abstract boolean isRemove(Chunk chunk);
	
	public void reset() {
		chunks = new ArrayList();
	}
}