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A library provides facade api for data accessing.
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package net.cassite.daf4j.ds;
import net.cassite.daf4j.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* DataSource通用工具类
*/
public class DSUtils {
private DSUtils() {
}
/**
* list执行时的解析过程
*
* @param context 上下文
* @param whereClause 条件语句
* @param parameter 参数
* @param parserPacket 解析器包
* @param 上下文类型
* @param 基本元素类型
* @param 数据源类型
* @return 上下文
* @throws Exception 可能的异常
*/
public static Context listGenerationProcess(Context context, Where whereClause, QueryParameter parameter, ParserPacket parserPacket) throws Exception {
context = parserPacket.aroundParser.beforeParsingList(context);
context = parseSelectOperation(context, whereClause, parameter, parserPacket.aroundParser, parserPacket.andOrParser, parserPacket.conditionResolver, parserPacket.expressionResolver, parserPacket.queryParameterParser);
context = parserPacket.aroundParser.afterParsingList(context);
return context;
}
/**
* projection执行时的解析过程
*
* @param context 上下文
* @param whereClause 条件语句
* @param parameter 参数
* @param parserPacket 解析器包
* @param 上下文类型
* @param 基本元素类型
* @param 数据源类型
* @return 上下文
* @throws Exception 可能的异常
*/
public static Context projectionGenerationProcess(Context context, Where whereClause, QueryParameterWithFocus parameter, ParserPacket parserPacket) throws Exception {
DSUtils.parseQueryParameterWithFocus(context, parameter, parserPacket.aroundParser, parserPacket.queryParameterParser);
context = parserPacket.aroundParser.beforeParsingProjection(context);
context = DSUtils.parseSelectOperation(context, whereClause, parameter, parserPacket.aroundParser, parserPacket.andOrParser, parserPacket.conditionResolver, parserPacket.expressionResolver, parserPacket.queryParameterParser);
context = parserPacket.aroundParser.afterParsingProjection(context);
return context;
}
/**
* update执行时的解析过程
*
* @param context 上下文
* @param whereClause 条件语句
* @param entries 更新项
* @param parserPacket 解析器包
* @param 上下文类型
* @param 基本元素类型
* @param 数据源类型
* @return 上下文
* @throws Exception 可能的异常
*/
public static Context updateGenerationProcess(Context context, Where whereClause, UpdateEntry[] entries, ParserPacket parserPacket) throws Exception {
parserPacket.aroundParser.beforeParsingUpdate(context);
parserPacket.aroundParser.beforeParsingWhere(context, whereClause);
BasicElement elem = DSUtils.parseWhere(context, whereClause, parserPacket.andOrParser, parserPacket.conditionResolver, parserPacket.expressionResolver);
parserPacket.aroundParser.afterParsingWhere(context, whereClause, elem);
context = parserPacket.aroundParser.beforeParsingUpdateEntries(context, entries);
parserPacket.updateEntryParser.parseUpdateEntry(context, entries);
parserPacket.aroundParser.afterParsingUpdateEntries(context);
context = parserPacket.aroundParser.afterParsingUpdate(context);
return context;
}
/**
* remove执行时的解析过程
*
* @param context 上下文
* @param whereClause 条件语句
* @param parserPacket 解析器包
* @param 上下文类型
* @param 基本元素类型
* @param 数据源类型
* @return 上下文
* @throws Exception 可能的异常
*/
public static Context removeGenerationProcess(Context context, Where whereClause, ParserPacket parserPacket) throws Exception {
context = parserPacket.aroundParser.beforeParsingRemove(context);
parserPacket.aroundParser.beforeParsingWhere(context, whereClause);
BasicElement elem = DSUtils.parseWhere(context, whereClause, parserPacket.andOrParser, parserPacket.conditionResolver, parserPacket.expressionResolver);
parserPacket.aroundParser.afterParsingWhere(context, whereClause, elem);
context = parserPacket.aroundParser.afterParsingRemove(context);
return context;
}
/**
* 解析"带取字段"的查询条件
*
* @param context 上下文
* @param qpwf 查询条件
* @param aroundParser 全局解释器
* @param queryParameterParser 查询参数解释器
* @param 上下文
* @param 基本元素
* @param 数据源类型
* @throws Exception 可能的异常
*/
public static void parseQueryParameterWithFocus(Context context,
QueryParameterWithFocus qpwf,
AroundParser aroundParser,
QueryParameterParser queryParameterParser) throws Exception {
aroundParser.beforeParsingFocusPart(context, qpwf);
queryParameterParser.focus(context, qpwf.focusMap);
aroundParser.afterParsingFocusPart(context);
}
/**
* 解析where子句
*
* @param context 上下文
* @param where where子句
* @param andOrParser 与,或解释器
* @param conditionResolver 条件处理
* @param expressionResolver 表达式处理
* @param 上下文类型
* @param 基本元素类型
* @return 生成的基本元素
* @throws Exception 可能的异常
*/
public static BasicElement parseWhere(Context context,
Where where,
AndOrParser andOrParser,
ConditionResolver conditionResolver,
ExpressionResolver expressionResolver) throws Exception {
if (where.isAnd()) {
// AND
And and = (And) where;
context = andOrParser.beforeParsingAnd(context, and);
List elems = new ArrayList();
for (Or or : and.getOrList()) {
BasicElement elem = parseWhere(context, or, andOrParser, conditionResolver, expressionResolver);
if (elem != null) {
elems.add(elem);
}
}
BasicElement elem = andOrParser.and(context, and.getConditionList(), and.getExpBoolList());
if (elem != null) {
elems.add(elem);
}
return andOrParser.afterParsingAnd(context, elems.size() == 0 ? null : andOrParser.and(context, elems));
} else if (where.isCondition()) {
// CONDITION
return conditionResolver.resolve(context, (Condition) where);
} else if (where.isExpression()) {
// EXP
return expressionResolver.resolve(context, (IExpression) where);
} else if (where.isOr()) {
// OR
Or or = (Or) where;
context = andOrParser.beforeParsingOr(context, or);
List elems = new ArrayList();
for (And and : or.getAndList()) {
BasicElement elem = parseWhere(context, and, andOrParser, conditionResolver, expressionResolver);
if (elem != null) {
elems.add(elem);
}
}
BasicElement elem = andOrParser.or(context, or.getConditionList(), or.getExpBoolList());
if (elem != null) {
elems.add(elem);
}
return andOrParser.afterParsingOr(context, elems.size() == 0 ? null : andOrParser.or(context, elems));
} else {
throw new IllegalArgumentException("Unknown where type");
}
}
/**
* 解析查询参数
*
* @param context 上下文
* @param queryParameter 查询参数
* @param queryParameterParser 查询参数解释器
* @param 上下文类型
* @param 基本元素类型
* @throws Exception 可能的异常
*/
public static void parseQueryParameter(Context context,
QueryParameter queryParameter,
QueryParameterParser queryParameterParser) throws Exception {
if (queryParameter != null) {
Map parameters = queryParameter.parameters;
for (QueryParameterTypes type : parameters.keySet()) {
Object[] objArr = parameters.get(type);
if (type == QueryParameterTypes.limit) {
queryParameterParser.limit(context, (Integer) objArr[0], (Integer) objArr[1]);
} else if (type == QueryParameterTypes.orderBy) {
queryParameterParser.orderBy(context, (OrderBase[]) objArr);
} else if (type == QueryParameterTypes.top) {
queryParameterParser.top(context, (Integer) objArr[0]);
} else if (type == QueryParameterTypes.distinct) {
queryParameterParser.distinct(context);
}
}
}
}
/**
* 解释select过程(会被listGeneration和projectionGeneration调用)
*
* @param context 上下文
* @param whereClause 条件语句
* @param parameter 查询参数
* @param aroundParser 全局解释器
* @param andOrParser 与,或解释器
* @param conditionResolver 条件处理
* @param expressionResolver 表达式处理
* @param queryParameterParser 查询参数解释器
* @param 上下文类型
* @param 基本元素类型
* @param 数据源类型
* @return 上下文
* @throws Exception 可能的异常
*/
public static Context parseSelectOperation(Context context,
Where whereClause,
QueryParameter parameter,
AroundParser aroundParser,
AndOrParser andOrParser,
ConditionResolver conditionResolver,
ExpressionResolver expressionResolver,
QueryParameterParser queryParameterParser) throws Exception {
context = aroundParser.beforeParsingWhere(context, whereClause);
BasicElement elem = null;
if (whereClause != null) {
elem = parseWhere(context, whereClause, andOrParser, conditionResolver, expressionResolver);
}
aroundParser.afterParsingWhere(context, whereClause, elem);
context = aroundParser.beforeParsingQueryParameter(context, parameter);
parseQueryParameter(context, parameter, queryParameterParser);
aroundParser.afterParsingQueryParameter(context);
return context;
}
}
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