Package gnu.trove.map.hash

Class TObjectCharHashMap<K>

java.lang.Object
gnu.trove.impl.hash.THash
gnu.trove.impl.hash.TObjectHash<K>
gnu.trove.map.hash.TObjectCharHashMap<K>
All Implemented Interfaces:
TObjectCharMap<K>, Externalizable, Serializable
public class TObjectCharHashMap<K> extends gnu.trove.impl.hash.TObjectHash<K> implements TObjectCharMap<K>, Externalizable
An open addressed Map implementation for Object keys and char values. Created: Sun Nov 4 08:52:45 2001
See Also:

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    protected class 
    TObjectCharHashMap.KeyView
    a view onto the keys of the map.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected char[]
    _values
    the values of the map
    protected char
    no_entry_value
    the value that represents null

    Fields inherited from class gnu.trove.impl.hash.TObjectHash

    _set, consumeFreeSlot, FREE, REMOVED

    Fields inherited from class gnu.trove.impl.hash.THash

    _autoCompactionFactor, _autoCompactRemovesRemaining, _autoCompactTemporaryDisable, _free, _loadFactor, _maxSize, _size, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR

  • Constructor Summary

    Constructors
    Constructor
    Description
    TObjectCharHashMap()
    Creates a new TObjectCharHashMap instance with the default capacity and load factor.
    TObjectCharHashMap(int initialCapacity)
    Creates a new TObjectCharHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
    TObjectCharHashMap(int initialCapacity, float loadFactor)
    Creates a new TObjectCharHashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.
    TObjectCharHashMap(int initialCapacity, float loadFactor, char noEntryValue)
    Creates a new TObjectCharHashMap instance with a prime value at or near the specified capacity and load factor.
    TObjectCharHashMap(TObjectCharMap<? extends K> map)
    Creates a new TObjectCharHashMap that contains the entries in the map passed to it.

  • Method Summary

    Modifier and Type
    Method
    Description
    char
    adjustOrPutValue(K key, char adjust_amount, char put_amount)
    Adjusts the primitive value mapped to the key if the key is present in the map.
    boolean
    adjustValue(K key, char amount)
    Adjusts the primitive value mapped to key.
    void
    clear()
    Empties the collection.
    boolean
    containsKey(Object key)
    Returns true if this map contains a mapping for the specified key.
    boolean
    containsValue(char val)
    Returns true if this map maps one or more keys to the specified value.
    boolean
    equals(Object other)
    Compares this map with another map for equality of their stored entries.
    boolean
    forEachEntry(TObjectCharProcedure<? super K> procedure)
    Executes procedure for each key/value entry in the map.
    boolean
    forEachKey(TObjectProcedure<? super K> procedure)
    Executes procedure for each key in the map.
    boolean
    forEachValue(TCharProcedure procedure)
    Executes procedure for each value in the map.
    char
    get(Object key)
    Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
    char
    getNoEntryValue()
    Returns the value that will be returned from TObjectCharMap.get(java.lang.Object) or TObjectCharMap.put(K, char) if no entry exists for a given key.
    int
    hashCode()
    Returns the hash code value for this map.
    boolean
    increment(K key)
    Increments the primitive value mapped to key by 1
    TObjectCharIterator<K>
    iterator()
    Returns a TObjectCharIterator with access to this map's keys and values.
    Object[]
    keys()
    Returns a copy of the keys of the map as an array.
    K[]
    keys(K[] a)
    Returns a copy of the keys of the map as an array.
    Set<K>
    keySet()
    Returns a Set view of the keys contained in this map.
    char
    put(K key, char value)
    Associates the specified value with the specified key in this map (optional operation).
    void
    putAll(TObjectCharMap<? extends K> map)
    Put all the entries from the given map into this map.
    void
    putAll(Map<? extends K,? extends Character> map)
    Copies all of the mappings from the specified map to this map (optional operation).
    char
    putIfAbsent(K key, char value)
    Inserts a key/value pair into the map if the specified key is not already associated with a value.
    void
    readExternal(ObjectInput in)
     
    protected void
    rehash(int newCapacity)
    rehashes the map to the new capacity.
    char
    remove(Object key)
    Removes the mapping for a key from this map if it is present (optional operation).
    protected void
    removeAt(int index)
    Removes the mapping at index from the map.
    boolean
    retainEntries(TObjectCharProcedure<? super K> procedure)
    Retains only those entries in the map for which the procedure returns a true value.
    int
    setUp(int initialCapacity)
    initializes the hashtable to a prime capacity which is at least initialCapacity + 1.
    String
    toString()
    void
    transformValues(TCharFunction function)
    Transform the values in this map using function.
    TCharCollection
    valueCollection()
    Returns a TCharCollection view of the values contained in this map.
    char[]
    values()
    Returns the values of the map as an array of char values.
    char[]
    values(char[] array)
    Returns the values of the map using an existing array.
    void
    writeExternal(ObjectOutput out)
     

    Methods inherited from class gnu.trove.impl.hash.TObjectHash

    buildObjectContractViolation, capacity, contains, dumpExtraInfo, equals, forEach, hash, index, insertionIndex, insertKey, objectInfo, reportPotentialConcurrentMod, throwObjectContractViolation, throwObjectContractViolation

    Methods inherited from class gnu.trove.impl.hash.THash

    calculateGrownCapacity, compact, computeMaxSize, computeNextAutoCompactionAmount, ensureCapacity, getAutoCompactionFactor, isEmpty, postInsertHook, reenableAutoCompaction, setAutoCompactionFactor, size, tempDisableAutoCompaction, trimToSize

    Methods inherited from class java.lang.Object

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

    Methods inherited from interface gnu.trove.map.TObjectCharMap

    isEmpty, size

  • Field Details

    • _values

      protected transient char[] _values
      the values of the map

    • no_entry_value

      protected char no_entry_value
      the value that represents null

  • Constructor Details

    • TObjectCharHashMap

      public TObjectCharHashMap()
      Creates a new TObjectCharHashMap instance with the default capacity and load factor.

    • TObjectCharHashMap

      public TObjectCharHashMap(int initialCapacity)
      Creates a new TObjectCharHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
      Parameters:
      initialCapacity - an int value

    • TObjectCharHashMap

      public TObjectCharHashMap(int initialCapacity, float loadFactor)
      Creates a new TObjectCharHashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.
      Parameters:
      initialCapacity - an int value
      loadFactor - a float value

    • TObjectCharHashMap

      public TObjectCharHashMap(int initialCapacity, float loadFactor, char noEntryValue)
      Creates a new TObjectCharHashMap instance with a prime value at or near the specified capacity and load factor.
      Parameters:
      initialCapacity - used to find a prime capacity for the table.
      loadFactor - used to calculate the threshold over which rehashing takes place.
      noEntryValue - the value used to represent null.

    • TObjectCharHashMap

      public TObjectCharHashMap(TObjectCharMap<? extends K> map)
      Creates a new TObjectCharHashMap that contains the entries in the map passed to it.
      Parameters:
      map - the TObjectCharMap to be copied.

  • Method Details

    • setUp

      public int setUp(int initialCapacity)
      initializes the hashtable to a prime capacity which is at least initialCapacity + 1.
      Overrides:
      setUp in class gnu.trove.impl.hash.TObjectHash<K>
      Parameters:
      initialCapacity - an int value
      Returns:
      the actual capacity chosen

    • rehash

      protected void rehash(int newCapacity)
      rehashes the map to the new capacity.
      Specified by:
      rehash in class gnu.trove.impl.hash.THash
      Parameters:
      newCapacity - an int value

    • getNoEntryValue

      public char getNoEntryValue()
      Returns the value that will be returned from TObjectCharMap.get(java.lang.Object) or TObjectCharMap.put(K, char) if no entry exists for a given key. The default value is generally zero, but can be changed during construction of the collection.
      Specified by:
      getNoEntryValue in interface TObjectCharMap<K>
      Returns:
      the value that represents a null value in this collection.

    • containsKey

      public boolean containsKey(Object key)
      Returns true if this map contains a mapping for the specified key. More formally, returns true if and only if this map contains a mapping for a key k such that (key==null ? k==null : key.equals(k)). (There can be at most one such mapping.)
      Specified by:
      containsKey in interface TObjectCharMap<K>
      Parameters:
      key - key whose presence in this map is to be tested
      Returns:
      true if this map contains a mapping for the specified key

    • containsValue

      public boolean containsValue(char val)
      Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that (value==no_entry_value ? v==no_entry_value : value.equals(v)). This operation will probably require time linear in the map size for most implementations of the Map interface.

      Note that no_entry_value is the result of TObjectCharMap.getNoEntryValue() and represents null for this map instance.

      Specified by:
      containsValue in interface TObjectCharMap<K>
      Parameters:
      val - char value whose presence in this map is to be tested
      Returns:
      true if this map maps one or more keys to the specified value

    • get

      public char get(Object key)
      Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

      More formally, if this map contains a mapping from a key k to a value v such that (key==null ? k==null : key.equals(k)), then this method returns v; otherwise it returns null. (There can be at most one such mapping.)

      If this map permits null values, then a return value of null does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

      Specified by:
      get in interface TObjectCharMap<K>
      Parameters:
      key - the key whose associated value is to be returned
      Returns:
      the char value to which the specified key is mapped, or null if this map contains no mapping for the key

    • put

      public char put(K key, char value)
      Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.)
      Specified by:
      put in interface TObjectCharMap<K>
      Parameters:
      key - key with which the specified value is to be associated
      value - an char value value to be associated with the specified key
      Returns:
      the previous value associated with key, or no_entry_value if there was no mapping for key. (A no_entry_value return can also indicate that the map previously associated null with key, if the implementation supports null values.)
      See Also:

    • putIfAbsent

      public char putIfAbsent(K key, char value)
      Inserts a key/value pair into the map if the specified key is not already associated with a value.
      Specified by:
      putIfAbsent in interface TObjectCharMap<K>
      Parameters:
      key - key with which the specified value is to be associated
      value - an char value to be associated with the specified key
      Returns:
      the previous value associated with key, or the "no entry" value if none was found (see TObjectCharMap.getNoEntryValue()).

    • remove

      public char remove(Object key)
      Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that (key==null ? k==null : key.equals(k)), that mapping is removed. (The map can contain at most one such mapping.)

      Returns the value to which this map previously associated the key, or null if the map contained no mapping for the key.

      If this map permits null values, then a return value of null does not necessarily indicate that the map contained no mapping for the key; it's also possible that the map explicitly mapped the key to null.

      The map will not contain a mapping for the specified key once the call returns.

      Specified by:
      remove in interface TObjectCharMap<K>
      Parameters:
      key - key whose mapping is to be removed from the map
      Returns:
      the previous char value associated with key, or null if there was no mapping for key.

    • removeAt

      protected void removeAt(int index)
      Removes the mapping at index from the map. This method is used internally and public mainly because of packaging reasons. Caveat Programmer.
      Overrides:
      removeAt in class gnu.trove.impl.hash.TObjectHash<K>
      Parameters:
      index - an int value

    • putAll

      public void putAll(Map<? extends K,? extends Character> map)
      Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of calling put(k, v) on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is undefined if the specified map is modified while the operation is in progress.
      Specified by:
      putAll in interface TObjectCharMap<K>
      Parameters:
      map - mappings to be stored in this map

    • putAll

      public void putAll(TObjectCharMap<? extends K> map)
      Put all the entries from the given map into this map.
      Specified by:
      putAll in interface TObjectCharMap<K>
      Parameters:
      map - The map from which entries will be obtained to put into this map.

    • clear

      public void clear()
      Empties the collection.
      Specified by:
      clear in interface TObjectCharMap<K>
      Overrides:
      clear in class gnu.trove.impl.hash.THash

    • keySet

      public Set<K> keySet()
      Returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.
      Specified by:
      keySet in interface TObjectCharMap<K>
      Returns:
      a set view of the keys contained in this map

    • keys

      public Object[] keys()
      Returns a copy of the keys of the map as an array. Changes to the array of keys will not be reflected in the map nor vice-versa.
      Specified by:
      keys in interface TObjectCharMap<K>
      Returns:
      a copy of the keys of the map as an array.

    • keys

      public K[] keys(K[] a)
      Returns a copy of the keys of the map as an array. Changes to the array of keys will not be reflected in the map nor vice-versa.
      Specified by:
      keys in interface TObjectCharMap<K>
      Parameters:
      a - the array into which the elements of the list are to be stored, if it is big enough; otherwise, a new array of the same type is allocated for this purpose.
      Returns:
      the keys of the map as an array.

    • valueCollection

      public TCharCollection valueCollection()
      Returns a TCharCollection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the TCharIterator.remove, TCharCollection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.
      Specified by:
      valueCollection in interface TObjectCharMap<K>
      Returns:
      a collection view of the values contained in this map

    • values

      public char[] values()
      Returns the values of the map as an array of char values. Changes to the array of values will not be reflected in the map nor vice-versa.
      Specified by:
      values in interface TObjectCharMap<K>
      Returns:
      the values of the map as an array of char values.

    • values

      public char[] values(char[] array)
      Returns the values of the map using an existing array. Changes to the array of values will not be reflected in the map nor vice-versa.
      Specified by:
      values in interface TObjectCharMap<K>
      Parameters:
      array - the array into which the elements of the list are to be stored, if it is big enough; otherwise, a new array of the same type is allocated for this purpose.
      Returns:
      the values of the map as an array of char values.

    • iterator

      public TObjectCharIterator<K> iterator()
      Description copied from interface: TObjectCharMap
      Returns a TObjectCharIterator with access to this map's keys and values.
      Specified by:
      iterator in interface TObjectCharMap<K>
      Returns:
      an iterator over the entries in this map

    • increment

      public boolean increment(K key)
      Increments the primitive value mapped to key by 1
      Specified by:
      increment in interface TObjectCharMap<K>
      Parameters:
      key - the key of the value to increment
      Returns:
      true if a mapping was found and modified.

    • adjustValue

      public boolean adjustValue(K key, char amount)
      Adjusts the primitive value mapped to key.
      Specified by:
      adjustValue in interface TObjectCharMap<K>
      Parameters:
      key - the key of the value to increment
      amount - the amount to adjust the value by.
      Returns:
      true if a mapping was found and modified.

    • adjustOrPutValue

      public char adjustOrPutValue(K key, char adjust_amount, char put_amount)
      Adjusts the primitive value mapped to the key if the key is present in the map. Otherwise, the initial_value is put in the map.
      Specified by:
      adjustOrPutValue in interface TObjectCharMap<K>
      Parameters:
      key - the key of the value to increment
      adjust_amount - the amount to adjust the value by
      put_amount - the value put into the map if the key is not initial present
      Returns:
      the value present in the map after the adjustment or put operation

    • forEachKey

      public boolean forEachKey(TObjectProcedure<? super K> procedure)
      Executes procedure for each key in the map.
      Specified by:
      forEachKey in interface TObjectCharMap<K>
      Parameters:
      procedure - a TObjectProcedure value
      Returns:
      false if the loop over the keys terminated because the procedure returned false for some key.

    • forEachValue

      public boolean forEachValue(TCharProcedure procedure)
      Executes procedure for each value in the map.
      Specified by:
      forEachValue in interface TObjectCharMap<K>
      Parameters:
      procedure - a TCharProcedure value
      Returns:
      false if the loop over the values terminated because the procedure returned false for some value.

    • forEachEntry

      public boolean forEachEntry(TObjectCharProcedure<? super K> procedure)
      Executes procedure for each key/value entry in the map.
      Specified by:
      forEachEntry in interface TObjectCharMap<K>
      Parameters:
      procedure - a TOObjectCharProcedure value
      Returns:
      false if the loop over the entries terminated because the procedure returned false for some entry.

    • retainEntries

      public boolean retainEntries(TObjectCharProcedure<? super K> procedure)
      Retains only those entries in the map for which the procedure returns a true value.
      Specified by:
      retainEntries in interface TObjectCharMap<K>
      Parameters:
      procedure - determines which entries to keep
      Returns:
      true if the map was modified.

    • transformValues

      public void transformValues(TCharFunction function)
      Transform the values in this map using function.
      Specified by:
      transformValues in interface TObjectCharMap<K>
      Parameters:
      function - a TCharFunction value

    • equals

      public boolean equals(Object other)
      Compares this map with another map for equality of their stored entries.
      Specified by:
      equals in interface TObjectCharMap<K>
      Overrides:
      equals in class Object
      Parameters:
      other - an Object value
      Returns:
      a boolean value

    • hashCode

      public int hashCode()
      Returns the hash code value for this map. The hash code of a map is defined to be the sum of the hash codes of each entry in the map's entrySet() view. This ensures that m1.equals(m2) implies that m1.hashCode()==m2.hashCode() for any two maps m1 and m2, as required by the general contract of Object.hashCode().
      Specified by:
      hashCode in interface TObjectCharMap<K>
      Overrides:
      hashCode in class Object
      Returns:
      the hash code value for this map
      See Also:

    • writeExternal

      public void writeExternal(ObjectOutput out) throws IOException
      Specified by:
      writeExternal in interface Externalizable
      Overrides:
      writeExternal in class gnu.trove.impl.hash.TObjectHash<K>
      Throws:
      IOException

    • readExternal

      public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
      Specified by:
      readExternal in interface Externalizable
      Overrides:
      readExternal in class gnu.trove.impl.hash.TObjectHash<K>
      Throws:
      IOException
      ClassNotFoundException

    • toString

      public String toString()
      Overrides:
      toString in class Object