NumericType.java
/*
** Module : NumericType.java
** Abstract : Handles dynamic conversion from/to SQL/FWD numerical type.
**
** Copyright (c) 2019-2024, Golden Code Development Corporation.
**
** -#- -I- --Date-- ---------------------------------------Description---------------------------------------
** 001 OM 20191101 Created initial version.
** 002 ECF 20200919 Fixed typo.
** OM 20221117 Some properties (datetime-tz) may take a different number of positional parameters when
** used in insert/update or where predicate.
** 003 TJD 20240123 Java 17 compatibility updates
*/
/*
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU Affero General Public License for more details.
**
** You may find a copy of the GNU Affero GPL version 3 at the following
** location: https://www.gnu.org/licenses/agpl-3.0.en.html
**
** Additional terms under GNU Affero GPL version 3 section 7:
**
** Under Section 7 of the GNU Affero GPL version 3, the following additional
** terms apply to the works covered under the License. These additional terms
** are non-permissive additional terms allowed under Section 7 of the GNU
** Affero GPL version 3 and may not be removed by you.
**
** 0. Attribution Requirement.
**
** You must preserve all legal notices or author attributions in the covered
** work or Appropriate Legal Notices displayed by works containing the covered
** work. You may not remove from the covered work any author or developer
** credit already included within the covered work.
**
** 1. No License To Use Trademarks.
**
** This license does not grant any license or rights to use the trademarks
** Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
** of Golden Code Development Corporation. You are not authorized to use the
** name Golden Code, FWD, or the names of any author or contributor, for
** publicity purposes without written authorization.
**
** 2. No Misrepresentation of Affiliation.
**
** You may not represent yourself as Golden Code Development Corporation or FWD.
**
** You may not represent yourself for publicity purposes as associated with
** Golden Code Development Corporation, FWD, or any author or contributor to
** the covered work, without written authorization.
**
** 3. No Misrepresentation of Source or Origin.
**
** You may not represent the covered work as solely your work. All modified
** versions of the covered work must be marked in a reasonable way to make it
** clear that the modified work is not originating from Golden Code Development
** Corporation or FWD. All modified versions must contain the notices of
** attribution required in this license.
*/
package com.goldencode.p2j.persist.orm.types;
import com.goldencode.p2j.persist.Record;
import com.goldencode.p2j.persist.orm.*;
import com.goldencode.p2j.util.*;
import java.lang.*;
import java.math.*;
import java.sql.*;
/** This object handles dynamic conversion from/to SQL/FWD numerical type. */
public class NumericType
implements DataHandler
{
/**
* Creates and returns a new {@link NumberType} from a SQL counterpart. The evaluation is
* dynamic in the sense that the returned result depends on the {@code sqlVal} and is not
* assumed to be a specific type as for other specific numeric types.
*
* @param sqlVal
* A value obtained from a SQL query, which needs to be converted to a
* {@code BaseDataType}.
*
* @return A FWD {@code NumberType} object representing the same value as {@code sqlVal}.
*/
@Override
public NumberType convert(Object sqlVal)
{
if (sqlVal == null)
{
return new int64();
}
else if (sqlVal instanceof BigDecimal)
{
return new decimal((BigDecimal) sqlVal);
}
else if (sqlVal instanceof Long)
{
return new int64((Long) sqlVal);
}
else if (sqlVal instanceof Integer)
{
return new integer((Integer) sqlVal);
}
else if (sqlVal instanceof Double)
{
return new integer((Double) sqlVal);
}
else if (sqlVal instanceof Float)
{
return new integer((Float) sqlVal);
}
else
{
String asString = sqlVal.toString();
return asString.indexOf('.') < 0 ? new int64(asString) : new decimal(asString);
}
}
/**
* Does nothing, this method should not be called.
*
* @param rs
* The {@code ResultSet} to read from.
* @param rsOffset
* The index/position in current row of {@code rs} to start reading.
* @param data
* The destination. Ie. the record's {@code data} field member.
* @param propIndex
* The destination offset. Ie. the property index.
*
* @return nothing.
*
* @throws UnsupportedOperationException
* Always as this operation is not supported.
*/
@Override
public int readProperty(ResultSet rs, int rsOffset, Object[] data, int propIndex)
throws SQLException
{
throw new UnsupportedOperationException();
}
/**
* Use the data from a {@link character} field stored in {@code BaseRecord.data} and use it
* to initialize a parameter of type a known numerical type in a SQL prepared query.
*
* @param stmt
* The prepared statement whose parameter is to be set.
* @param index
* The index/position of the parameter.
* @param val
* The value of the parameter. Must be a {@code decimal}.
* @param forUpdate
* {@code true} if the parameter in the statement is used to update a field and {@code false} if
* it is used as part of the where predicate. Ignored here.
*
* @return 1 (the number of position used by this value).
*
* @throws SQLException
* when an error is encountered while setting the value.
*/
@Override
public int setParameter(PreparedStatement stmt, int index, Object val, boolean forUpdate)
throws SQLException
{
if (val != null)
{
NumberType asBDT = (NumberType) val;
if (!asBDT.isUnknown())
{
stmt.setDouble(index, asBDT.doubleValue());
return 1;
}
}
stmt.setNull(index, Types.DECIMAL);
return 1;
}
/**
* Compute the size in bytes taken by a specified value for the data type handled by this
* class. The returned value is used to compute the index size.
*
* @param val
* The value to be computed the size.
*
* @return the number of bytes the {@code val} object occupies.
*/
@Override
public int getFieldSizeInIndex(Object val)
{
throw new RuntimeException("Not implemented !");
}
/**
* Sets a value of a property in a {@code Record}. The specified value is converted from
* {@code BaseDataType} FWD standard to plain Java, as the {@code data} array expects before
* assigning the value to right offset.
*
* @param data
* The {@code data} array of the record to be altered.
* @param val
* The {@code BaseDataType} value to be set.
* @param offset
* The offset of the property, ie, the entry in {@code data} array. This includes both
* base property offset and the eventual extent index.
* @param meta
* Property metadata. Used to fine-tune stored data.
*/
@Override
public void setField(Object[] data, BaseDataType val, int offset, PropertyMeta meta)
{
throw new RuntimeException("Not implemented !");
}
/**
* Obtain the value of the property of a {@code Record} located at a specified offset in {@code data}
* array. It assumes the data at specified offset is compatible with this data handler.
*
* @param r
* The {@code Record}.
* @param offset
* The offset.
*
* @return The value requested wrapped as a {@code BaseDataType}.
*/
@Override
public BaseDataType getField(Record r, int offset)
{
throw new RuntimeException("Not implemented !");
}
}