author | František Kučera <franta-hg@frantovo.cz> |
Thu, 29 Nov 2018 22:30:12 +0100 | |
branch | v_0 |
changeset 29 | 142bdbba520f |
parent 25 | 135ef93a4ac2 |
child 30 | 3f18cb7a6963 |
permissions | -rw-r--r-- |
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license: GNU GPLv3+
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/** |
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license: GNU GPLv3+
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* Relational pipes |
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license: GNU GPLv3+
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* Copyright © 2018 František Kučera (Frantovo.cz, GlobalCode.info) |
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license: GNU GPLv3+
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* |
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license: GNU GPLv3+
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* This program is free software: you can redistribute it and/or modify |
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license: GNU GPLv3+
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <string> |
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#include "../include/relpipe/writer/TypeId.h" |
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#include "../include/relpipe/writer/typedefs.h" |
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namespace relpipe { |
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namespace writer { |
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* This class contains common features that are independent from particular data type (generic/template type) |
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class DataTypeWriterBase { |
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private: |
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const TypeId typeId; |
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const string_t typeCode; |
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public: |
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DataTypeWriterBase(const TypeId typeId, const string_t typeCode) : |
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typeId(typeId), typeCode(typeCode) { |
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} |
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virtual ~DataTypeWriterBase() { |
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}; |
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/** |
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* @param output output stream, should be at position where the value is to be written; the stream will not be closed not flushed after writing |
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* @param stringValue write value as given data type (e.g. integer or boolean); stringValue parameter contains given value in string representation of given data type |
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* E.g. integer 123 is passed as a character string "123" |
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* boolean true is passed as a character string "true". |
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* See Relational pipes format specification for details. |
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*/ |
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virtual void writeString(std::ostream& output, const string_t &stringValue) = 0; |
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/** |
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* @param output output stream, should be at position where the value is to be written; the stream will not be closed not flushed after writing |
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* @param value raw pointer to the value, must exactly match data type of this writer |
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* @param type used as a safety mechanism to avoid wrong pointer interpretation; |
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* should be called in this way: writeRaw(output, &value, typeid(value)); |
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* if the type does not match, the RelpipeWriterException is thrown |
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* |
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* TODO: typeid() / type_info seems working but consider also sizeof() / size_t and teplates |
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*/ |
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virtual void writeRaw(std::ostream& output, const void * value, const std::type_info& type) = 0; |
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/** |
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* @param dataType data type code as defined in DDP L0 |
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* @return whether this class supports conversions of this type |
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*/ |
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virtual bool supports(const TypeId &dataType) { |
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return dataType == typeId; |
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} |
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/** |
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* @param dataType data type name as defined in DDP L0 |
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* @return whether this class supports conversions of this type |
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*/ |
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virtual bool supports(const string_t &dataType) { |
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return dataType == typeCode; |
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} |
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TypeId getTypeId() { |
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return typeId; |
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} |
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string_t getTypeCode() { |
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return typeCode; |
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} |
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}; |
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} |
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} |