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

There is a newer version: 20240823

package com.scudata.dw;

import com.scudata.dm.Context;
import com.scudata.dm.LongArray;
import com.scudata.dm.cursor.ICursor;
import com.scudata.expression.Expression;

/**
 * ????????ӿ???
 * @author runqian
 *
 */
public interface ITableIndex {
	public static final String INDEX_FIELD_NAMES[] = { "name", "hash", "keys", "field", "where" };
	public static final String INDEX_FIELD_NAMES2[] = { "hash", "keys", "field", "where" };
	public static final int TEMP_FILE_SIZE = 50 * 1024 * 1024;//????ʱ?Ļ????ļ???С
	public static int MIN_ICURSOR_REC_COUNT = 1000;//??С?????ֵʱ???ٽ??н????????ǿ?ʼ????
	public static int MIN_ICURSOR_BLOCK_COUNT = 10;//??С?????ֵʱ???ٽ??н????????ǿ?ʼ????
	public ICursor select(Expression exp, String []fields, String opt, Context ctx);
	public LongArray select(Expression exp, String opt, Context ctx);
	
	/**
	 * ??ȡ????????????Ϣ???ڴ?
	 */
	public void loadAllBlockInfo();
	
	/**
	 * ??ȡ????????????Ϣ???ڴ棨????????
	 */
	public void loadAllKeys();
	
	/**
	 * ?ͷ??ڴ??????????Ϣ
	 */
	public void unloadAllBlockInfo();
	
	/**
	 * ??????????????
	 * @param name
	 */
	public void setName(String name);
	
	/**
	 * ????ȡ???ֶκ??????ֶ?
	 * @param ifields ?????ֶ?
	 * @param vfields ȡ???ֶ?
	 */
	public void setFields(String[] ifields, String[] vfields);
	
	/**
	 * ?д?ʱ????ȡ??ʱ?????size???д?ʱ??????
	 * @return
	 */
	public int getMaxRecordLen();
	
	/**
	 * ?Ƿ???ڵڶ?????????
	 * @return
	 */
	public boolean hasSecIndex();
	
	/**
	 * ????һ????¼??Ӧ?ĵ?ַ????
	 * һ?㶼??1??ֻ?ڸ???ʱ?ſ??ܶ??
	 * @return
	 */
	public int getPositionCount();
	
	/**
	 * ????????Ϣд????һ???±?table
	 * @param table
	 */
	public void dup(PhyTable table);
	
	/**
	 * ????????Ľṹ??Ϣ
	 * @return
	 */
	public Object getIndexStruct();
}