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SPL(Structured Process Language) A programming language specially for structured data computing.
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package com.scudata.dw;

import java.io.IOException;

import com.scudata.dm.DataStruct;
import com.scudata.dm.Record;
/**
 * ?????????ļ?¼??
 * @author runqian
 *
 */
public class ModifyRecord {
	public static final int STATE_DELETE = -1;
	public static final int STATE_UPDATE = 0;
	public static final int STATE_INSERT = 1;
	
	private long recordSeq; // ??¼???
	private int state; // ״̬
	private	Record record; // ?????STATE_DELETE״̬???
	
	private long parentRecordSeq = 0; // ??Ӧ????????¼?ţ???ֵʱ??ʾ??????????¼?ţ?????????û????
	private int block;

	// ???????л?
	public ModifyRecord() {
	}
	
	/**
	 * 
	 * @param recordSeq ??Ӧ?ļ?¼?ţ?α?ţ?
	 * @param state ״̬
	 * @param record
	 */
	public ModifyRecord(long recordSeq, int state, Record record) {
		this.recordSeq = recordSeq;
		this.state = state;
		this.record = record;
	}

	/**
	 * ?½?һ??ɾ??״̬?ļ?¼
	 * @param recordSeq
	 */
	public ModifyRecord(long recordSeq) {
		this.recordSeq = recordSeq;
		this.state = STATE_DELETE;
	}

	
	public void writeExternal(BufferWriter writer) throws IOException {
		writer.writeLong(recordSeq);
		writer.writeByte(state);
		if (state != STATE_DELETE) {
			Object []values = record.getFieldValues();
			for (Object val : values) {
				writer.writeObject(val);
			}
			
			writer.flush();
		}
		
		writer.writeLong(parentRecordSeq);
	}
	
	public void readExternal(BufferReader reader, DataStruct ds) throws IOException {
		recordSeq = reader.readLong();
		state = reader.readByte();
		
		if (state != STATE_DELETE) {
			Record r = new Record(ds);
			this.record = r;
			
			for (int i = 0, fcount = ds.getFieldCount(); i < fcount; ++i) {
				r.setNormalFieldValue(i, reader.readObject());
			}
		}
		
		parentRecordSeq = reader.readLong();
	}
	
	public void setDelete() {
		state = STATE_DELETE;
		record = null;
	}
	
	public boolean isDelete() {
		return state == STATE_DELETE;
	}
	
	public boolean isInsert() {
		return state == STATE_INSERT;
	}
	
	public boolean isUpdate() {
		return state == STATE_UPDATE;
	}
	
	public void setRecord(Record r) {
		this.record = r;
	}
	
	public void setRecord(Record r, int state) {
		this.record = r;
		this.state = state;
	}
	
	public Record getRecord() {
		return record;
	}
	
	public long getRecordSeq() {
		return recordSeq;
	}
	
	public int getState() {
		return state;
	}
	
	public long getParentRecordSeq() {
		return parentRecordSeq;
	}
	
	public void setParentRecordSeq(long parentRecordSeq) {
		this.parentRecordSeq = parentRecordSeq;
	}
	
	public int getBlock() {
		return block;
	}

	public void setBlock(int block) {
		this.block = block;
	}

	public boolean isBottom() {
		return block > 0;
	}
}