BaseEntity.java

package com.ketayao.fensy.db;

import java.io.Serializable;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.beanutils.BeanUtils;

import com.ketayao.fensy.cache.CacheManager;

/** 
 * @author 	<a href="mailto:ketayao@gmail.com">ketayao</a>
 * @since   2014年3月20日 下午3:22:41 
 */
public class BaseEntity extends BaseBean {

	private static final long serialVersionUID = 161331467465531285L;

	private long id;
	
	private String tableName;
	
	public Object getCache(Serializable key) {
		return CacheManager.get(getCacheRegion(), key);
	}
	
	public void putCache(Serializable key, Serializable value) {
		CacheManager.put(getCacheRegion(), key, value);
	}
	
	public void evictCache(Serializable key) {
		CacheManager.evict(getCacheRegion(), key);
	}
	
	public void evictCache(boolean dr) {
		if (dr && isCachedByID()) {
			evictCache(getId());
		}
	}
	
	/**
	 * @return the id
	 */
	public long getId() {
		return id;
	}

	/**
	 * @param id the id to set
	 */
	public void setId(long id) {
		this.id = id;
	}

	/**
	 * @return the tableName
	 */
	protected String getTableName() {
		if (tableName == null)
			tableName = DBManager.prefixTableName + Inflector.getInstance().tableize(getClass());
		return tableName;
	}
	
	/**
	 * 是否根据ID缓存对象，此方法对Get(long id)有效
	 * 
	 * @return
	 */
	protected boolean isCachedByID() {
		return true;
	}

	/**
	 * 返回对象对应的ID缓存区域名
	 * 
	 * @return
	 */
	protected String getCacheRegion() {
		return this.getClass().getSimpleName();
	}
	
	/**
	 * 返回对象对应的查询缓存区域名
	 * 
	 * @return
	 */
	protected String getQueryCacheRegion() {
		return getCacheRegion();
	}
	
	/**
	 * 列出要插入到数据库的域集合，子类可以覆盖此方法
	 * 
	 * @return
	 */
	@SuppressWarnings("unchecked")
	protected Map<String, Object> listInsertableFields() {
		try {
			Map<String, Object> props = BeanUtils.describe(this);
			if (getId() <= 0)
				props.remove("id");
			props.remove("class");
			
			Map<String, Object> priMap = new HashMap<String, Object>();
			for (Entry<String, Object> entry : props.entrySet()) {
				Field field = null;
				try {
					// 有些方法可能并没有对应的属性，如果存在则跳过。
					field = this.getClass().getDeclaredField(entry.getKey());
				} catch (NoSuchFieldException e) {
					continue;
				}
				
				if (QueryHelper.isPrimitive(field.getType())) {
					priMap.put(entry.getKey(), entry.getValue());
				}
			}
			
			return priMap;
		} catch (Exception e) {
			throw new RuntimeException("Exception when Fetching fields of " + this, e);
		}
	}
}