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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.util
import org.opendc.trace.TableReader
import java.time.Duration
import java.time.Instant
import java.util.UUID
/**
* A helper class to chain multiple [TableReader]s.
*/
public abstract class CompositeTableReader : TableReader {
/**
* A flag to indicate that the reader has starting, meaning the user called [nextRow] at least once
* (and in turn [nextReader]).
*/
private var hasStarted = false
/**
* The active [TableReader] instance.
*/
private var delegate: TableReader? = null
/**
* Obtain the next [TableReader] instance to read from or `null` if there are no more readers to read from.
*/
protected abstract fun nextReader(): TableReader?
override fun nextRow(): Boolean {
tryStart()
var delegate = delegate
while (delegate != null) {
if (delegate.nextRow()) {
break
}
delegate.close()
delegate = nextReader()
this.delegate = delegate
}
return delegate != null
}
override fun resolve(name: String): Int {
tryStart()
val delegate = delegate
return delegate?.resolve(name) ?: -1
}
override fun isNull(index: Int): Boolean {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.isNull(index)
}
override fun getBoolean(index: Int): Boolean {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getBoolean(index)
}
override fun getInt(index: Int): Int {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getInt(index)
}
override fun getLong(index: Int): Long {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getLong(index)
}
override fun getFloat(index: Int): Float {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getFloat(index)
}
override fun getDouble(index: Int): Double {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getDouble(index)
}
override fun getString(index: Int): String? {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getString(index)
}
override fun getUUID(index: Int): UUID? {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getUUID(index)
}
override fun getInstant(index: Int): Instant? {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getInstant(index)
}
override fun getDuration(index: Int): Duration? {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getDuration(index)
}
override fun <T> getList(
index: Int,
elementType: Class<T>,
): List<T>? {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getList(index, elementType)
}
override fun <T> getSet(
index: Int,
elementType: Class<T>,
): Set<T>? {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getSet(index, elementType)
}
override fun <K, V> getMap(
index: Int,
keyType: Class<K>,
valueType: Class<V>,
): Map<K, V>? {
val delegate = checkNotNull(delegate) { "Invalid reader state" }
return delegate.getMap(index, keyType, valueType)
}
override fun close() {
delegate?.close()
}
override fun toString(): String = "CompositeTableReader"
/**
* Try to obtain the initial delegate.
*/
private fun tryStart() {
if (!hasStarted) {
assert(delegate == null) { "Duplicate initialization" }
delegate = nextReader()
hasStarted = true
}
}
}
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