Package com.google.common.collect

Class TreeRangeMap<K extends java.lang.Comparable,​V>

  • All Implemented Interfaces:
    RangeMap<K,​V>
    public final class TreeRangeMap<K extends java.lang.Comparable,​V>
extends java.lang.Object
implements RangeMap<K,​V>
    An implementation of RangeMap based on a TreeMap, supporting all optional operations.

    Like all RangeMap implementations, this supports neither null keys nor null values.

    Since:
    14.0

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private TreeRangeMap()  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.util.Map<Range<K>,​V> asDescendingMapOfRanges()
      Returns a view of this range map as an unmodifiable Map<Range<K>, V>.
      java.util.Map<Range<K>,​V> asMapOfRanges()
      Returns a view of this range map as an unmodifiable Map<Range<K>, V>.
      void clear()
      Removes all associations from this range map (optional operation).
      private static <K extends java.lang.Comparable,​V>
      Range<K>      		 coalesce​(Range<K> range, V value, java.util.Map.Entry<Cut<K>,​TreeRangeMap.RangeMapEntry<K,​V>> entry)
      Returns the range that spans the given range and entry, if the entry can be coalesced.
      private Range<K> coalescedRange​(Range<K> range, V value)
      Computes the coalesced range for the given range+value - does not mutate the map.
      static <K extends java.lang.Comparable,​V>
      TreeRangeMap<K,​V>      		 create()  
      private RangeMap<K,​V> emptySubRangeMap()  
      boolean equals​(java.lang.Object o)
      Returns true if obj is another RangeMap that has an equivalent RangeMap.asMapOfRanges().
      V get​(K key)
      Returns the value associated with the specified key, or null if there is no such value.
      java.util.Map.Entry<Range<K>,​V> getEntry​(K key)
      Returns the range containing this key and its associated value, if such a range is present in the range map, or null otherwise.
      int hashCode()
      Returns asMapOfRanges().hashCode().
      void merge​(Range<K> range, V value, java.util.function.BiFunction<? super V,​? super V,​? extends V> remappingFunction)
      Merges a value into the map over a range by applying a remapping function.
      void put​(Range<K> range, V value)
      Maps a range to a specified value (optional operation).
      void putAll​(RangeMap<K,​V> rangeMap)
      Puts all the associations from rangeMap into this range map (optional operation).
      void putCoalescing​(Range<K> range, V value)
      Maps a range to a specified value, coalescing this range with any existing ranges with the same value that are connected to this range.
      private void putRangeMapEntry​(Cut<K> lowerBound, Cut<K> upperBound, V value)  
      void remove​(Range<K> rangeToRemove)
      Removes all associations from this range map in the specified range (optional operation).
      Range<K> span()
      Returns the minimal range enclosing the ranges in this RangeMap.
      private void split​(Cut<K> cut)  
      RangeMap<K,​V> subRangeMap​(Range<K> subRange)
      Returns a view of the part of this range map that intersects with range.
      java.lang.String toString()
      Returns a readable string representation of this range map.

      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    • Field Detail

      • entriesByLowerBound

        private final java.util.NavigableMap<Cut<K extends java.lang.Comparable>,​TreeRangeMap.RangeMapEntry<K extends java.lang.Comparable,​V>> entriesByLowerBound

      • EMPTY_SUB_RANGE_MAP

        private static final RangeMap EMPTY_SUB_RANGE_MAP

    • Constructor Detail

      • TreeRangeMap

        private TreeRangeMap()

    • Method Detail

      • create

        public static <K extends java.lang.Comparable,​V> TreeRangeMap<K,​V> create()

      • get

        public V get​(K key)
        Description copied from interface: RangeMap
        Returns the value associated with the specified key, or null if there is no such value.

        Specifically, if any range in this range map contains the specified key, the value associated with that range is returned.

        Specified by:
        get in interface RangeMap<K extends java.lang.Comparable,​V>

      • getEntry

        public java.util.Map.Entry<Range<K>,​V> getEntry​(K key)
        Description copied from interface: RangeMap
        Returns the range containing this key and its associated value, if such a range is present in the range map, or null otherwise.
        Specified by:
        getEntry in interface RangeMap<K extends java.lang.Comparable,​V>

      • put

        public void put​(Range<K> range,
                V value)
        Description copied from interface: RangeMap
        Maps a range to a specified value (optional operation).

        Specifically, after a call to put(range, value), if range.contains(k), then get(k) will return value.

        If range is empty, then this is a no-op.

        Specified by:
        put in interface RangeMap<K extends java.lang.Comparable,​V>

      • putCoalescing

        public void putCoalescing​(Range<K> range,
                          V value)
        Description copied from interface: RangeMap
        Maps a range to a specified value, coalescing this range with any existing ranges with the same value that are connected to this range.

        The behavior of get(k) after calling this method is identical to the behavior described in put(range, value), however the ranges returned from RangeMap.asMapOfRanges() will be different if there were existing entries which connect to the given range and value.

        Even if the input range is empty, if it is connected on both sides by ranges mapped to the same value those two ranges will be coalesced.

        Note: coalescing requires calling .equals() on any connected values, which may be expensive depending on the value type. Using this method on range maps with large values such as Collection types is discouraged.

        Specified by:
        putCoalescing in interface RangeMap<K extends java.lang.Comparable,​V>

      • coalescedRange

        private Range<K> coalescedRange​(Range<K> range,
                                V value)
        Computes the coalesced range for the given range+value - does not mutate the map.

      • coalesce

        private static <K extends java.lang.Comparable,​V> Range<K> coalesce​(Range<K> range,
                                                                          V value,
                                                                          java.util.Map.Entry<Cut<K>,​TreeRangeMap.RangeMapEntry<K,​V>> entry)
        Returns the range that spans the given range and entry, if the entry can be coalesced.

      • putAll

        public void putAll​(RangeMap<K,​V> rangeMap)
        Description copied from interface: RangeMap
        Puts all the associations from rangeMap into this range map (optional operation).
        Specified by:
        putAll in interface RangeMap<K extends java.lang.Comparable,​V>

      • clear

        public void clear()
        Description copied from interface: RangeMap
        Removes all associations from this range map (optional operation).
        Specified by:
        clear in interface RangeMap<K extends java.lang.Comparable,​V>

      • span

        public Range<K> span()
        Description copied from interface: RangeMap
        Returns the minimal range enclosing the ranges in this RangeMap.
        Specified by:
        span in interface RangeMap<K extends java.lang.Comparable,​V>

      • putRangeMapEntry

        private void putRangeMapEntry​(Cut<K> lowerBound,
                              Cut<K> upperBound,
                              V value)

      • remove

        public void remove​(Range<K> rangeToRemove)
        Description copied from interface: RangeMap
        Removes all associations from this range map in the specified range (optional operation).

        If !range.contains(k), get(k) will return the same result before and after a call to remove(range). If range.contains(k), then after a call to remove(range), get(k) will return null.

        Specified by:
        remove in interface RangeMap<K extends java.lang.Comparable,​V>

      • split

        private void split​(Cut<K> cut)

      • merge

        public void merge​(Range<K> range,
                  V value,
                  java.util.function.BiFunction<? super V,​? super V,​? extends V> remappingFunction)
        Description copied from interface: RangeMap
        Merges a value into the map over a range by applying a remapping function.

        If any parts of the range are already present in this range map, those parts are mapped to new values by applying the remapping function. Any parts of the range not already present in this range map are mapped to the specified value, unless the value is null.

        Any existing map entry spanning either range boundary may be split at the boundary, even if the merge does not affect its value.

        For example, if rangeMap had one entry [1, 5] => 3 then rangeMap.merge(Range.closed(0,2), 3, Math::max) could yield a range map with the entries [0, 1) => 3, [1, 2] => 3, (2, 5] => 3.

        Specified by:
        merge in interface RangeMap<K extends java.lang.Comparable,​V>

      • asMapOfRanges

        public java.util.Map<Range<K>,​V> asMapOfRanges()
        Description copied from interface: RangeMap
        Returns a view of this range map as an unmodifiable Map<Range<K>, V>. Modifications to this range map are guaranteed to read through to the returned Map.

        The returned Map iterates over entries in ascending order of the bounds of the Range entries.

        It is guaranteed that no empty ranges will be in the returned Map.

        Specified by:
        asMapOfRanges in interface RangeMap<K extends java.lang.Comparable,​V>

      • asDescendingMapOfRanges

        public java.util.Map<Range<K>,​V> asDescendingMapOfRanges()
        Description copied from interface: RangeMap
        Returns a view of this range map as an unmodifiable Map<Range<K>, V>. Modifications to this range map are guaranteed to read through to the returned Map.

        The returned Map iterates over entries in descending order of the bounds of the Range entries.

        It is guaranteed that no empty ranges will be in the returned Map.

        Specified by:
        asDescendingMapOfRanges in interface RangeMap<K extends java.lang.Comparable,​V>

      • subRangeMap

        public RangeMap<K,​V> subRangeMap​(Range<K> subRange)
        Description copied from interface: RangeMap
        Returns a view of the part of this range map that intersects with range.

        For example, if rangeMap had the entries [1, 5] => "foo", (6, 8) => "bar", (10, ∞) => "baz" then rangeMap.subRangeMap(Range.open(3, 12)) would return a range map with the entries (3, 5] => "foo", (6, 8) => "bar", (10, 12) => "baz".

        The returned range map supports all optional operations that this range map supports, except for asMapOfRanges().iterator().remove().

        The returned range map will throw an IllegalArgumentException on an attempt to insert a range not enclosed by range.

        Specified by:
        subRangeMap in interface RangeMap<K extends java.lang.Comparable,​V>

      • emptySubRangeMap

        private RangeMap<K,​V> emptySubRangeMap()

      • equals

        public boolean equals​(java.lang.Object o)
        Description copied from interface: RangeMap
        Returns true if obj is another RangeMap that has an equivalent RangeMap.asMapOfRanges().
        Specified by:
        equals in interface RangeMap<K extends java.lang.Comparable,​V>
        Overrides:
        equals in class java.lang.Object

      • hashCode

        public int hashCode()
        Description copied from interface: RangeMap
        Returns asMapOfRanges().hashCode().
        Specified by:
        hashCode in interface RangeMap<K extends java.lang.Comparable,​V>
        Overrides:
        hashCode in class java.lang.Object

      • toString

        public java.lang.String toString()
        Description copied from interface: RangeMap
        Returns a readable string representation of this range map.
        Specified by:
        toString in interface RangeMap<K extends java.lang.Comparable,​V>
        Overrides:
        toString in class java.lang.Object