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/*
* Copyright (c) 2021 AtLarge Research
*
* 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.
*/
package org.opendc.trace
/**
* Base class for reading entities from a workload trace table in streaming fashion.
*/
public interface TableReader : AutoCloseable {
/**
* Advance the stream until the next row is reached.
*
* @return `true` if the row is valid, `false` if there are no more rows.
*/
public fun nextRow(): Boolean
/**
* Resolve the index of the specified [column] for this reader.
*
* @param column The column to lookup.
* @return The zero-based index of the column or a negative value if the column is not present in this table.
*/
public fun resolve(column: TableColumn<*>): Int
/**
* Determine whether the [TableReader] supports the specified [column].
*/
public fun hasColumn(column: TableColumn<*>): Boolean = resolve(column) >= 0
/**
* Determine whether the specified [column] has a `null` value for the current row.
*
* @param index The zero-based index of the column to check for a null value.
* @throws IllegalArgumentException if the column index is not valid for this reader.
* @return `true` if the column value for the current value has a `null` value, `false` otherwise.
*/
public fun isNull(index: Int): Boolean
/**
* Obtain the object value of the column with the specified [index].
*
* @param index The zero-based index of the column to obtain the value for.
* @throws IllegalArgumentException if the column index is not valid for this reader.
* @return The object value of the column.
*/
public fun get(index: Int): Any?
/**
* Obtain the boolean value of the column with the specified [index].
*
* @param index The zero-based index of the column to obtain the value for.
* @throws IllegalArgumentException if the column index is not valid for this reader.
* @return The boolean value of the column or `false` if the column is `null`.
*/
public fun getBoolean(index: Int): Boolean
/**
* Obtain the integer value of the column with the specified [index].
*
* @param index The zero-based index of the column to obtain the value for.
* @throws IllegalArgumentException if the column index is not valid for this reader.
* @return The integer value of the column or `0` if the column is `null`.
*/
public fun getInt(index: Int): Int
/**
* Obtain the double value of the column with the specified [index].
*
* @param index The zero-based index of the column to obtain the value for.
* @throws IllegalArgumentException if the column index is not valid for this reader.
* @return The long value of the column or `0` if the column is `null`.
*/
public fun getLong(index: Int): Long
/**
* Obtain the double value of the column with the specified [index].
*
* @param index The zero-based index of the column to obtain the value for.
* @throws IllegalArgumentException if the column index is not valid for this reader.
* @return The double value of the column or [Double.NaN] if the column is `null`.
*/
public fun getDouble(index: Int): Double
/**
* Determine whether the specified [column] has a `null` value for the current row.
*
* @param column The column to lookup.
* @throws IllegalArgumentException if the column is not valid for this table.
* @return `true` if the column value for the current value has a `null` value, `false` otherwise.
*/
public fun isNull(column: TableColumn<*>): Boolean = isNull(resolve(column))
/**
* Obtain the value of the current column with type [T].
*
* @param column The column to obtain the value for.
* @throws IllegalArgumentException if the column is not valid for this reader.
* @return The object value of the column.
*/
public fun <T> get(column: TableColumn<T>): T {
// This cast should always succeed since the resolve the index of the typed column
@Suppress("UNCHECKED_CAST")
return get(resolve(column)) as T
}
/**
* Read the specified [column] as boolean.
*
* @param column The column to obtain the value for.
* @throws IllegalArgumentException if the column is not valid for this reader.
* @return The boolean value of the column or `false` if the column is `null`.
*/
public fun getBoolean(column: TableColumn<Boolean>): Boolean = getBoolean(resolve(column))
/**
* Read the specified [column] as integer.
*
* @param column The column to obtain the value for.
* @throws IllegalArgumentException if the column is not valid for this reader.
* @return The integer value of the column or `0` if the column is `null`.
*/
public fun getInt(column: TableColumn<Int>): Int = getInt(resolve(column))
/**
* Read the specified [column] as long.
*
* @param column The column to obtain the value for.
* @throws IllegalArgumentException if the column is not valid for this reader.
* @return The long value of the column or `0` if the column is `null`.
*/
public fun getLong(column: TableColumn<Long>): Long = getLong(resolve(column))
/**
* Read the specified [column] as double.
*
* @param column The column to obtain the value for.
* @throws IllegalArgumentException if the column is not valid for this reader.
* @return The double value of the column or [Double.NaN] if the column is `null`.
*/
public fun getDouble(column: TableColumn<Double>): Double = getDouble(resolve(column))
/**
* Closes the reader so that no further iteration or data access can be made.
*/
public override fun close()
}
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