CsvReadDataProvider.qc.dox.h

// -*- mode: c++; indent-tabs-mode: nil -*-
// Qore CsvReadDataProvider class definition
 
/*  CsvReadDataProvider.qc Copyright 2012 - 2023 Qore Technologies, s.r.o.
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:
 
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
 
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/
 
namespace CsvUtil {
 
class CsvReadDataProvider : public DataProvider::AbstractDataProvider {
 
public:
        const ProviderInfo = <DataProviderInfo>{
            "type": "CsvReadDataProvider",
            "supports_read": True,
            "has_record": True,
            "supports_search_expressions": True,
            "constructor_options": ConstructorOptions,
            "search_options": GenericRecordSearchOptions,
            "expressions": AbstractDataProvider::GenericExpressions,
        };
 
        const ConstructorOptions = {
            "path": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(StringType),
                "desc": "the location of the CSV data; mutually exclusive with \"stream\"; resolved with a call to "
                    "FileLocationHandler::getBinaryStreamFromLocation()",
            },
            "stream": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(new Type("InputStream")),
                "desc": "an input stream for CSV data; mutually exclusive with \"path\"",
            },
            "date_format": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(StringType),
                "desc": "the default date format for `date` fields (ex: `DD/MM/YYYY HH:mm:SS`)",
            },
            "encoding": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(StringType),
                "desc": "character encoding for the file (and output data)",
            },
            "eol": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(StringType),
                "desc": "the end of line character(s); if not specified, then the end-of-line characters will be "
                    "auto detected",
            },
            "fields": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(AutoHashType),
                "desc": "the keys are field names as given by the `header_names` or `headers` options (in case "
                    "neither of these options are used, then field names are numbers starting with `0`) and the "
                    "values are either strings (one of `bool`, `int`, `float`, `number`, `string`, `date`, "
                    "optionally prefixed by `*` if the value is optional) or a hash describing the field; also sets "
                    "`headers` if not set automatically with `header_names`; if no field type is given, the default "
                    "is `*string`; note that invalid field names given in this option are ignored",
            },
            "header_lines": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(SoftIntType),
                "desc": "the number of headers lines in the file",
            },
            "header_names": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(SoftBoolType),
                "desc": "if `true` then the object will parse the header names from the first header row, in this "
                    "case if `header_lines` is not set explicitly, it will be assumed to be `1`",
            },
            "header_reorder": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(SoftBoolType),
                "desc": "if `true` (the default) then if `headers` are provided, then data fields are reordered to "
                    "follow headers",
            },
            "headers": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(new Type("softlist<string>")),
                "desc": "list of header / column names for the data iterated; if this is present, then "
                    "`header_names` must be `false`",
            },
            "ignore_empty": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(SoftBoolType),
                "desc": "if `true`, empty lines will be ignored",
            },
            "ignore_whitespace": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(SoftBoolType),
                "desc": "if `true`, leading and trailing whitespace will be stripped from non-quoted fields",
            },
            "number_format": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(StringType),
                "desc": "the default format for `int`, `float`, and `number` fields as a string giving the thousands "
                    "separator character followed by the decimal separator character (ex: `.,` for "
                    "continental-European-style numbers)",
            },
            "quote": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(StringType),
                "desc": "the field quote character (default: `\"`)",
            },
            "separator": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(StringType),
                "desc": "the string separating the fields in the file (default: `,`)",
            },
            "timezone": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(StringType),
                "desc": "the timezone region to use when parsing dates (ex: `Europe/Prague`)",
            },
            "tolwr": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(SoftBoolType),
                "desc": "if `true` (default `false`), all header names will be converted to lower case letters",
            },
            "verify_columns": <DataProviderOptionInfo>{
                "type": AbstractDataProviderType::get(SoftBoolType),
                "desc": "if `true` (default `false`), if a line is parsed with a different column or field count "
                    "than other lines, a `CSVFILEITERATOR-DATA-ERROR` exception is raised",
            },
        };
 
        const CsvIterationOptionList = keys (ConstructorOptions - ("path", "stream"));
 
protected:
        AbstractCsvIterator i;
 
public:
 
 
    constructor(string path, *hash<auto> opts);
 
 
 
    constructor(InputStream stream, *hash<auto> opts);
 
 
    string getName();
 
 
    constructor(*hash<auto> options);
 
 
 
protected:
     AbstractDataProviderRecordIterator searchRecordsImpl(*hash<auto> where_cond, *hash<auto> search_options);
public:
 
 
 
    private AbstractDataProviderRecordIterator searchRecordsImpl(*hash<DataProviderExpression> where_cond,
            *hash<auto> search_options) {
        return new DefaultRecordIterator(i, where_cond, search_options, getRecordType());
    }
 
protected:
     *hash<string, AbstractDataField> getRecordTypeImpl(*hash<auto> search_options);
public:
 
 
protected:
     hash<DataProviderInfo> getStaticInfoImpl();
public:
 
};
}; // CsvUtil namespace