Package com.google.common.collect

Class TreeRangeMap<K extends ,​V>

  • All Implemented Interfaces:
    RangeMap<K,​V>
    @Beta
@GwtIncompatible
public final class ,​V>
extends 
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
    Author:
    Louis Wasserman

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      <Range<K>,​V> asDescendingMapOfRanges()
      Returns a view of this range map as an unmodifiable Map<Range<K>, V>.
      <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).
      static <K extends ,​V>
      TreeRangeMap<K,​V>      		 create()  
      boolean  o)
      Indicates whether some other object is "equal to" this one.
      V get​(K key)
      Returns the value associated with the specified key, or null if there is no such value.
      <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 a hash code value for the object.
      void merge​(Range<K> range, V value, <? 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.
      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.
      RangeMap<K,​V> subRangeMap​(Range<K> subRange)
      Returns a view of the part of this range map that intersects with range.
      toString()
      Returns a string representation of the object.

      • Methods inherited from class java.lang.

        , , , , , , ,

    • Method Detail

      • 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:
        ,​V>

      • getEntry

        public  <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:
        ,​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:
        ,​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 types is discouraged.

        Specified by:
        ,​V>

      • 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:
        ,​V>

      • clear

        public void clear()
        Description copied from interface: RangeMap
        Removes all associations from this range map (optional operation).
        Specified by:
        ,​V>

      • span

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

      • 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:
        ,​V>

      • merge

        public void merge​(Range<K> range,
                   V value,
                  <? 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:
        ,​V>

      • asMapOfRanges

        public <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:
        ,​V>

      • asDescendingMapOfRanges

        public <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:
        ,​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 on an attempt to insert a range not enclosed by range.

        Specified by:
        ,​V>

      • equals

        public boolean   o)
        Description copied from class: 
        Indicates whether some other object is "equal to" this one.

        The equals method implements an equivalence relation on non-null object references:

        • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
        • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
        • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
        • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
        • For any non-null reference value x, x.equals(null) should return false.

        The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

        Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

        Specified by:
        ,​V>
        Overrides:
         in class 
        Parameters:
        o - the reference object with which to compare.
        Returns:
        true if this object is the same as the obj argument; false otherwise.
        See Also:
        ,

      • hashCode

        public int hashCode()
        Description copied from class: 
        Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by .

        The general contract of hashCode is:

        • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
        • If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
        • It is not required that if two objects are unequal according to the method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

        As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (The hashCode may or may not be implemented as some function of an object's memory address at some point in time.)

        Specified by:
        ,​V>
        Overrides:
         in class 
        Returns:
        a hash code value for this object.
        See Also:
        ,

      • toString

        public  toString()
        Description copied from class: 
        Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

        The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of: 

         getClass().getName() + '@' + Integer.toHexString(hashCode())
        Specified by:
        ,​V>
        Overrides:
         in class 
        Returns:
        a string representation of the object.