qmf/engine/Query.h Source File

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qmf/engine/Query.h
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    00001 #ifndef _QmfEngineQuery_
    00002 #define _QmfEngineQuery_
    00003
    00004 /*
    00005  * Licensed to the Apache Software Foundation (ASF) under one
    00006  * or more contributor license agreements.  See the NOTICE file
    00007  * distributed with this work for additional information
    00008  * regarding copyright ownership.  The ASF licenses this file
    00009  * to you under the Apache License, Version 2.0 (the
    00010  * "License"); you may not use this file except in compliance
    00011  * with the License.  You may obtain a copy of the License at
    00012  *
    00013  *   http://www.apache.org/licenses/LICENSE-2.0
    00014  *
    00015  * Unless required by applicable law or agreed to in writing,
    00016  * software distributed under the License is distributed on an
    00017  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    00018  * KIND, either express or implied.  See the License for the
    00019  * specific language governing permissions and limitations
    00020  * under the License.
    00021  */
    00022
    00023 #include <qmf/engine/ObjectId.h>
    00024 #include <qmf/engine/Value.h>
    00025
    00026 namespace qmf {
    00027 namespace engine {
    00028
    00029     class Object;
    00030     struct QueryElementImpl;
    00031     struct QueryImpl;
    00032     struct QueryExpressionImpl;
    00033     class  SchemaClassKey;
    00034
    00035     enum ValueOper {
    00036         O_EQ = 1,
    00037         O_NE = 2,
    00038         O_LT = 3,
    00039         O_LE = 4,
    00040         O_GT = 5,
    00041         O_GE = 6,
    00042         O_RE_MATCH = 7,
    00043         O_RE_NOMATCH = 8,
    00044         O_PRESENT = 9,
    00045         O_NOT_PRESENT = 10
    00046     };
    00047
    00048     struct QueryOperand {
    00049         virtual ~QueryOperand() {}
    00050         virtual bool evaluate(const Object* object) const = 0;
    00051     };
    00052
    00053     struct QueryElement : public QueryOperand {
    00054         QueryElement(const char* attrName, const Value* value, ValueOper oper);
    00055         QueryElement(QueryElementImpl* impl);
    00056         virtual ~QueryElement();
    00057         bool evaluate(const Object* object) const;
    00058
    00059         QueryElementImpl* impl;
    00060     };
    00061
    00062     enum ExprOper {
    00063         E_NOT = 1,
    00064         E_AND = 2,
    00065         E_OR  = 3,
    00066         E_XOR = 4
    00067     };
    00068
    00069     struct QueryExpression : public QueryOperand {
    00070         QueryExpression(ExprOper oper, const QueryOperand* operand1, const QueryOperand* operand2);
    00071         QueryExpression(QueryExpressionImpl* impl);
    00072         virtual ~QueryExpression();
    00073         bool evaluate(const Object* object) const;
    00074
    00075         QueryExpressionImpl* impl;
    00076     };
    00077
    00078     class Query {
    00079     public:
    00080         Query(const char* className, const char* packageName);
    00081         Query(const SchemaClassKey* key);
    00082         Query(const ObjectId* oid);
    00083         Query(const Query& from);
    00084         ~Query();
    00085
    00086         void setSelect(const QueryOperand* criterion);
    00087         void setLimit(uint32_t maxResults);
    00088         void setOrderBy(const char* attrName, bool decreasing);
    00089
    00090         const char* getPackage() const;
    00091         const char* getClass() const;
    00092         const ObjectId* getObjectId() const;
    00093
    00094         bool haveSelect() const;
    00095         bool haveLimit() const;
    00096         bool haveOrderBy() const;
    00097         const QueryOperand* getSelect() const;
    00098         uint32_t getLimit() const;
    00099         const char* getOrderBy() const;
    00100         bool getDecreasing() const;
    00101
    00102     private:
    00103         friend struct QueryImpl;
    00104         friend class BrokerProxyImpl;
    00105         Query(QueryImpl* impl);
    00106         QueryImpl* impl;
    00107     };
    00108 }
    00109 }
    00110
    00111 #endif
    00112