Package interval

Class MultiIntervalSet<L>

java.lang.Object

interval.MultiIntervalSet<L>

Type Parameters:

L - type of labels in this set, must be immutable

public class MultiIntervalSet<L>
extends Object

A mutable set of labeled intervals, where each label is associated with one or more non-overlapping half-open intervals [start, end). Neither intervals with the same label nor with different labels may overlap. Labels are of immutable type L and must implement the Object contract: they are compared for equality using Object.equals(java.lang.Object).

For example, { "A"=[[0,10)], "B"=[[20,30)] } is a multi-interval set where the labels are Strings "A" and "B". We could add "A"=[10,20) to that set to obtain { "A"=[[0,10),[10,20)], "B"=[[20,30)] }.

PS2 instructions: this is a required ADT class. You may not change the specifications or add new public methods. You must use IntervalSet in your rep, but otherwise the implementation of this class is up to you.

Constructor Summary

Constructors

Constructor	Description
MultiIntervalSet()	Create an empty multi-interval set.
MultiIntervalSet(IntervalSet<L> initial)	Create a new multi-interval set containing the given labeled intervals.

Method Summary

Modifier and Type	Method	Description
void	insert(long start, long end, L label)	Add a labeled interval (if not present) to this set, if it does not conflict with existing intervals.
IntervalSet<Integer>	intervals(L label)	Get all the intervals in this set associated with a given label.
Set<L>	labels()	Get the labels in this set.
boolean	removeAll(L label)	Remove all intervals of the given label from this set, if any.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MultiIntervalSet

public MultiIntervalSet()

Create an empty multi-interval set.

MultiIntervalSet

public MultiIntervalSet(IntervalSet<L> initial)

Create a new multi-interval set containing the given labeled intervals.

Parameters:

initial - initial contents of the new set

Method Detail

insert

public void insert(long start,
                   long end,
                   L label)
            throws IntervalConflictException

Add a labeled interval (if not present) to this set, if it does not conflict with existing intervals.

Labeled intervals conflict if:

• they have the same label with different, overlapping intervals, or
• they have different labels with overlapping intervals.

For example, if this set is { "A"=[[0,10),[20,30)] },

• insert("A"=[0,10)) has no effect
• insert("B"=[10,20)) adds "B"=[[10,20)]
• insert("C"=[20,30)) throws IntervalConflictException

Parameters:

start - low end of the interval, inclusive

end - high end of the interval, exclusive, must be greater than start

label - label to add

Throws:

IntervalConflictException - if label is already in this set and associated with an interval other than [start,end) that overlaps [start,end), or if an interval in this set with a different label overlaps [start,end)

removeAll

public boolean removeAll(L label)

Remove all intervals of the given label from this set, if any.

Parameters:

label - label to remove

Returns:

true if this set contained label, and false otherwise

labels

public Set<L> labels()

Get the labels in this set.

Returns:

the labels in this set

intervals

public IntervalSet<Integer> intervals(L label)
                               throws NoSuchElementException

Get all the intervals in this set associated with a given label. The returned set has Integer labels that act as indices: label 0 is associated with the lowest interval, 1 the next, and so on, for all the intervals in this set that have the provided label.

For example, if this set is { "A"=[[0,10),[20,30)], "B"=[[10,20)] },

• intervals("A") returns { 0=[0,10), 1=[20,30) }

Parameters:

label - the label

Returns:

a new interval set that associates integer indices with the in-order intervals of label in this set

Throws:

NoSuchElementException - if label is not in this set

toString

public String toString()

Overrides:

toString in class Object