package edu.scu.phoenix.dao;
import edu.scu.phoenix.utils.web.ServletUtils;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.lang.StringUtils;
import org.springframework.util.Assert;
import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
/**
* 与具体ORM实现无关的属性过滤条件封装类, 主要记录页面中简单的搜索过滤条件.
*
* @author calvin
*/
public class PropertyFilter {
/** 多个属性间OR关系的分隔符. */
public static final String OR_SEPARATOR = "_OR_";
/** 属性比较类型. */
public enum MatchType {
EQ, LIKE, LT, GT, LE, GE;
}
/** 属性数据类型. */
public enum PropertyType {
S(String.class), I(Integer.class), L(Long.class), N(Double.class), D(Date.class), B(Boolean.class);
private Class<?> clazz;
private PropertyType(Class<?> clazz) {
this.clazz = clazz;
}
public Class<?> getValue() {
return clazz;
}
}
private MatchType matchType = null;
private Object matchValue = null;
private Class<?> propertyClass = null;
private String[] propertyNames = null;
public PropertyFilter() {
}
/**
* @param filterName 比较属性字符串,含待比较的比较类型、属性值类型及属性列表.
* eg. LIKES_NAME_OR_LOGIN_NAME
* @param value 待比较的值.
*/
public PropertyFilter(final String filterName, final String value) {
String firstPart = StringUtils.substringBefore(filterName, "_");
String matchTypeCode = StringUtils.substring(firstPart, 0, firstPart.length() - 1);
String propertyTypeCode = StringUtils.substring(firstPart, firstPart.length() - 1, firstPart.length());
try {
matchType = Enum.valueOf(MatchType.class, matchTypeCode);
} catch (RuntimeException e) {
throw new IllegalArgumentException("filter名称" + filterName + "没有按规则编写,无法得到属性比较类型.", e);
}
try {
propertyClass = Enum.valueOf(PropertyType.class, propertyTypeCode).getValue();
} catch (RuntimeException e) {
throw new IllegalArgumentException("filter名称" + filterName + "没有按规则编写,无法得到属性值类型.", e);
}
String propertyNameStr = StringUtils.substringAfter(filterName, "_");
Assert.isTrue(StringUtils.isNotBlank(propertyNameStr), "filter名称" + filterName + "没有按规则编写,无法得到属性名称.");
propertyNames = StringUtils.splitByWholeSeparator(propertyNameStr, PropertyFilter.OR_SEPARATOR);
this.matchValue = ConvertUtils.convert(value, propertyClass);
}
/**
* 从HttpRequest中创建PropertyFilter列表, 默认Filter属性名前缀为filter.
*
* @see #buildFromHttpRequest(HttpServletRequest, String)
*/
public static List<PropertyFilter> buildFromHttpRequest(final HttpServletRequest request) {
return buildFromHttpRequest(request, "filter");
}
/**
* 从HttpRequest中创建PropertyFilter列表
* PropertyFilter命名规则为Filter属性前缀_比较类型属性类型_属性名.
*
* eg.
* filter_EQS_name
* filter_LIKES_name_OR_email
*/
public static List<PropertyFilter> buildFromHttpRequest(final HttpServletRequest request, final String filterPrefix) {
List<PropertyFilter> filterList = new ArrayList<PropertyFilter>();
//从request中获取含属性前缀名的参数,构造去除前缀名后的参数Map.
Map<String, Object> filterParamMap = ServletUtils.getParametersStartingWith(request, filterPrefix + "_");
//分析参数Map,构造PropertyFilter列表
for (Map.Entry<String, Object> entry : filterParamMap.entrySet()) {
String filterName = entry.getKey();
String value = (String) entry.getValue();
//如果value值为空,则忽略此filter.
if (StringUtils.isNotBlank(value)) {
PropertyFilter filter = new PropertyFilter(filterName, value);
filterList.add(filter);
}
}
return filterList;
}
/**
* 获取比较值的类型.
*/
public Class<?> getPropertyClass() {
return propertyClass;
}
/**
* 获取比较方式.
*/
public MatchType getMatchType() {
return matchType;
}
/**
* 获取比较值.
*/
public Object getMatchValue() {
return matchValue;
}
/**
* 获取比较属性名称列表.
*/
public String[] getPropertyNames() {
return propertyNames;
}
/**
* 获取唯一的比较属性名称.
*/
public String getPropertyName() {
Assert.isTrue(propertyNames.length == 1, "There are not only one property in this filter.");
return propertyNames[0];
}
/**
* 是否比较多个属性.
*/
public boolean hasMultiProperties() {
return (propertyNames.length > 1);
}
}