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36 package gr.grnet.aquarium.logic.accounting.dsl
39 import scala.collection.mutable
40 import annotation.tailrec
43 * A representation of a timeslot with a start and end date.
45 * @author Georgios Gousios <gousiosg@gmail.com>
47 final case class Timeslot(from: Date, to: Date)
48 extends DSLItem with Ordered[Timeslot] {
50 /* Preconditions to ensure correct object creations */
53 assert(from.before(to))
55 def startsBefore(t: Timeslot) : Boolean = this.from.before(t.from)
57 def startsAfter(t: Timeslot) : Boolean = this.from.after(t.from)
59 def endsBefore(t: Timeslot) : Boolean = this.to.before(t.to)
61 def endsAfter(t: Timeslot) : Boolean = this.to.after(t.to)
63 def after(t: Timeslot): Boolean = if (this.from.after(t.to)) true else false
65 def before(t: Timeslot): Boolean = if (this.to.before(t.from)) true else false
68 * Check whether this time slot fully contains the provided one.
70 def contains(t: Timeslot) : Boolean = t.startsAfter(this) && t.endsBefore(this)
73 * Check whether this timeslot contains the provided time instant.
75 def includes(t: Date) : Boolean =
76 if (from.before(t) && to.after(t)) true else false
79 * Check whether this timeslot overlaps with the provided one.
81 def overlaps(t: Timeslot) : Boolean = {
82 if (contains(t) || t.contains(this))
85 if (this.includes(t.from) || this.includes(t.to))
92 * Merges this timeslot with the provided one. If the timeslots overlap,
93 * a list with the resulting merge is returned. If the timeslots do not
94 * overlap, the returned list contains both timeslots in increasing start
97 def merge(t: Timeslot) : List[Timeslot] = {
99 val nfrom = if (from.before(t.from)) from else t.from
100 val nto = if (to.after(t.to)) to else t.to
101 List(Timeslot(nfrom, nto))
103 if (this.from.before(t.from))
110 * Split the timeslot in two parts at the provided timestamp, if the
111 * timestamp falls within the timeslot boundaries.
113 def slice(d: Date) : List[Timeslot] =
115 List(Timeslot(from, d), Timeslot(d,to))
120 * Find and return the timeslots within which this Timeslot overrides
121 * with the provided list of timeslots. For example if:
123 * - `this == Timeslot(7,20)`
124 * - `list == List(Timeslot(1,3), Timeslot(6,8), Timeslot(11,15))`
126 * the result will be: `List(Timeslot(7,8), Timeslot(11,15))`
128 def overlappingTimeslots(list: List[Timeslot]) : List[Timeslot] = {
130 val result = new mutable.ListBuffer[Timeslot]()
134 if (t.contains(this)) result += this
135 else if (this.contains(t)) result += t
136 else if (t.overlaps(this) && t.startsBefore(this)) result += this.slice(t.to).head
137 else if (t.overlaps(this) && t.startsAfter(this)) result += this.slice(t.from).last
143 * Find and return the timeslots whithin which this Timeslot does not
144 * override with the provided list of timeslots. For example if:
146 * - `this == Timeslot(7,20)`
147 * - `list == List(Timeslot(1,3), Timeslot(6,8), Timeslot(11,15))`
149 * the result will be: `List(Timeslot(9,10), Timeslot(15,20))`
151 def nonOverlappingTimeslots(list: List[Timeslot]): List[Timeslot] = {
153 val overlaps = list.filter(t => this.overlaps(t))
155 if (overlaps.isEmpty)
158 def build(acc: List[Timeslot], listPart: List[Timeslot]): List[Timeslot] = {
162 case x :: Nil => build(acc, List())
163 case x :: y :: rest =>
164 build(acc ++ List(Timeslot(x.to, y.from)), y :: rest)
168 val head = overlaps.head
169 val last = overlaps.reverse.head
171 val start = if (head.startsAfter(this)) List(Timeslot(this.from, head.from)) else List()
172 val end = if (last.endsBefore(this)) List(Timeslot(last.to, this.to)) else List()
174 start ++ build(List(), overlaps) ++ end
178 * Align a list of consecutive timeslots to the boundaries
179 * defined by this timeslot. Elements that do not overlap
180 * with this timeslot are rejected, while elements not
181 * contained in the timeslot are trimmed to this timeslot's
182 * start and end time.
184 def align(l: List[Timeslot]): List[Timeslot] = {
185 if (l.isEmpty) return List()
188 if (!this.overlaps(l.head)) List()
189 else if (this.contains(l.head)) List(l.head)
190 else if (l.head.startsBefore(this)) List(Timeslot(this.from, l.head.to))
191 else if (l.head.endsAfter(this)) List(Timeslot(l.head.from, this.to))
195 result.head :: align(l.tail)
201 * Compares the starting times of two timeslots.
203 def compare(that: Timeslot): Int = {
204 if (this.startsBefore(that)) -1
205 else if (this.startsAfter(that)) 1
210 * Converts the timeslot to the amount of hours it represents
212 def hours: Double = (to.getTime - from.getTime).toDouble / 1000.0 / 60.0 / 60.0
214 def deltaMillis = to.getTime - from.getTime
215 override def toString() = "from: %l, to: %l".format(from.getTime, to.getTime)