Modul speiger.src.collections
Package speiger.src.collections.chars.maps.impl.misc

Klasse Char2ShortArrayMap

java.lang.Object
java.util.AbstractMap<Character,Short>
speiger.src.collections.chars.maps.abstracts.AbstractChar2ShortMap
speiger.src.collections.chars.maps.impl.misc.Char2ShortArrayMap
Alle implementierten Schnittstellen:
Map<Character,Short>, Char2ShortFunction, Char2ShortMap, Char2ShortOrderedMap
public class Char2ShortArrayMap extends AbstractChar2ShortMap implements Char2ShortOrderedMap
A Very Specific Type Specific implementation of a ArrayMap. This type of map is for very specific use cases that usaully would have lead to Tupled Lists otherwise. It also does not allow duplication (except for array constructors) and checks from last to first. It is not designed to be used as a HashMap replacement due to the poor performance it would cause.
Note:
in this implementation SubMaps do NOT keep track of parent changes fully. For performance reasons it will just have a start/end index and not values Anything within that range will be updated appropiatly a shrink/growth of elements will break SubMaps in some ways. This can be useful but be careful, this implementation does not shrink and only grows.

  • Konstruktordetails

    • Char2ShortArrayMap

      public Char2ShortArrayMap()
      Default Constructor

    • Char2ShortArrayMap

      public Char2ShortArrayMap(int minCapacity)
      Constructor that defines the minimum capacity
      Parameter:
      minCapacity - the minimum capacity the HashMap is allowed to be.
      Löst aus:
      IllegalStateException - if the minimum capacity is negative

    • Char2ShortArrayMap

      public Char2ShortArrayMap(Character[] keys, Short[] values)
      Helper constructor that allow to create a map from boxed values (it will unbox them)
      Parameter:
      keys - the keys that should be put into the map
      values - the values that should be put into the map.
      Löst aus:
      IllegalStateException - if the keys and values do not match in length

    • Char2ShortArrayMap

      public Char2ShortArrayMap(Character[] keys, Short[] values, int length)
      Helper constructor that allow to create a map from boxed values (it will unbox them) with a custom length
      Parameter:
      keys - the keys that should be put into the map
      values - the values that should be put into the map.
      length - the amount of values that should be pulled from the array
      Löst aus:
      IllegalStateException - if the keys and values do not match in length

    • Char2ShortArrayMap

      public Char2ShortArrayMap(char[] keys, short[] values)
      Helper constructor that allow to create a map from unboxed values
      Parameter:
      keys - the keys that should be put into the map
      values - the values that should be put into the map.
      Löst aus:
      IllegalStateException - if the keys and values do not match in lenght

    • Char2ShortArrayMap

      public Char2ShortArrayMap(char[] keys, short[] values, int length)
      Helper constructor that allow to create a map from unboxed values
      Parameter:
      keys - the keys that should be put into the map
      values - the values that should be put into the map.
      length - the amount of values that should be pulled from the array
      Löst aus:
      IllegalStateException - if the keys and values do not match in lenght

    • Char2ShortArrayMap

      public Char2ShortArrayMap(Map<? extends Character,? extends Short> map)
      A Helper constructor that allows to create a Map with exactly the same values as the provided map.
      Parameter:
      map - the values that should be present in the map

    • Char2ShortArrayMap

      public Char2ShortArrayMap(Char2ShortMap map)
      A Type Specific Helper function that allows to create a new Map with exactly the same values as the provided map.
      Parameter:
      map - the values that should be present in the map

  • Methodendetails

    • put

      public short put(char key, short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type Specific method to reduce boxing/unboxing of values
      Angegeben von:
      put in Schnittstelle Char2ShortMap
      Parameter:
      key - the key that should be inserted,
      value - the value that should be inserted
      Gibt zurück:
      the last present value or default return value.
      Siehe auch:

    • putIfAbsent

      public short putIfAbsent(char key, short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type Specific method to reduce boxing/unboxing of values
      Angegeben von:
      putIfAbsent in Schnittstelle Char2ShortMap
      Parameter:
      key - the key that should be inserted,
      value - the value that should be inserted
      Gibt zurück:
      the last present value or default return value.
      Siehe auch:

    • addTo

      public short addTo(char key, short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Helper method to add a primitives together. If key is not present then this functions as a put.
      Angegeben von:
      addTo in Schnittstelle Char2ShortMap
      Parameter:
      key - the key that should be inserted,
      value - the value that should be inserted / added
      Gibt zurück:
      the last present value or default return value.

    • subFrom

      public short subFrom(char key, short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Helper method to subtract from primitive from each other. If the key is not present it will just return the defaultValue How the implementation works is that it will subtract from the current value (if not present it will do nothing) and fence it to the Char2ShortMap.getDefaultReturnValue() If the fence is reached the element will be automaticall removed
      Angegeben von:
      subFrom in Schnittstelle Char2ShortMap
      Parameter:
      key - that should be subtract from
      value - that should be subtract
      Gibt zurück:
      the last present or default return value

    • putAndMoveToFirst

      public short putAndMoveToFirst(char key, short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A customized put method that allows you to insert into the first index.
      Angegeben von:
      putAndMoveToFirst in Schnittstelle Char2ShortOrderedMap
      Parameter:
      key - the key that should be inserted
      value - the value that should be inserted
      Gibt zurück:
      the previous present or default return value
      Siehe auch:

    • putAndMoveToLast

      public short putAndMoveToLast(char key, short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A customized put method that allows you to insert into the last index. (This may be nessesary depending on the implementation)
      Angegeben von:
      putAndMoveToLast in Schnittstelle Char2ShortOrderedMap
      Parameter:
      key - the key that should be inserted
      value - the value that should be inserted
      Gibt zurück:
      the previous present or default return value
      Siehe auch:

    • moveToFirst

      public boolean moveToFirst(char key)
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A specific move method to move a given key/value to the first index.
      Angegeben von:
      moveToFirst in Schnittstelle Char2ShortOrderedMap
      Parameter:
      key - that should be moved to the first index
      Gibt zurück:
      true if the value was moved.

    • moveToLast

      public boolean moveToLast(char key)
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A specific move method to move a given key/value to the last index.
      Angegeben von:
      moveToLast in Schnittstelle Char2ShortOrderedMap
      Parameter:
      key - that should be moved to the first last
      Gibt zurück:
      true if the value was moved.

    • containsKey

      public boolean containsKey(char key)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type Specific method to reduce boxing/unboxing of values
      Angegeben von:
      containsKey in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      containsKey in Klasse AbstractChar2ShortMap
      Parameter:
      key - element that is searched for
      Gibt zurück:
      if the key is present

    • containsValue

      public boolean containsValue(short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type Specific method to reduce boxing/unboxing of values
      Angegeben von:
      containsValue in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      containsValue in Klasse AbstractChar2ShortMap
      Parameter:
      value - element that is searched for
      Gibt zurück:
      if the value is present

    • containsKey

      public boolean containsKey(Object key)
      Angegeben von:
      containsKey in Schnittstelle Char2ShortMap
      Angegeben von:
      containsKey in Schnittstelle Map<Character,Short>
      Setzt außer Kraft:
      containsKey in Klasse AbstractMap<Character,Short>
      Parameter:
      key - that is searched for.
      Gibt zurück:
      true if found
      Siehe auch:

    • containsValue

      public boolean containsValue(Object value)
      Angegeben von:
      containsValue in Schnittstelle Char2ShortMap
      Angegeben von:
      containsValue in Schnittstelle Map<Character,Short>
      Setzt außer Kraft:
      containsValue in Klasse AbstractMap<Character,Short>
      Parameter:
      value - that is searched for.
      Gibt zurück:
      true if found
      Siehe auch:

    • get

      public short get(char key)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific get method to reduce boxing/unboxing
      Angegeben von:
      get in Schnittstelle Char2ShortMap
      Parameter:
      key - the key that is searched for
      Gibt zurück:
      the searched value or default return value

    • getOrDefault

      public short getOrDefault(char key, short defaultValue)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific getOrDefault method to reduce boxing/unboxing
      Angegeben von:
      getOrDefault in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      getOrDefault in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that is searched for
      defaultValue - the value that should be returned if the key is not present
      Gibt zurück:
      the searched value or defaultValue value

    • getAndMoveToFirst

      public short getAndMoveToFirst(char key)
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A Specific get method that allows to move teh given key/value int the first index.
      Angegeben von:
      getAndMoveToFirst in Schnittstelle Char2ShortOrderedMap
      Parameter:
      key - that is searched for
      Gibt zurück:
      the given value for the requested key or default return value

    • getAndMoveToLast

      public short getAndMoveToLast(char key)
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A Specific get method that allows to move teh given key/value int the last index.
      Angegeben von:
      getAndMoveToLast in Schnittstelle Char2ShortOrderedMap
      Parameter:
      key - that is searched for
      Gibt zurück:
      the given value for the requested key or default return value

    • firstCharKey

      public char firstCharKey()
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A method to get the first Key of a Map.
      Angegeben von:
      firstCharKey in Schnittstelle Char2ShortOrderedMap
      Gibt zurück:
      the first key in the map

    • lastCharKey

      public char lastCharKey()
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A method to get the last Key of a Map.
      Angegeben von:
      lastCharKey in Schnittstelle Char2ShortOrderedMap
      Gibt zurück:
      the last key in the map

    • firstShortValue

      public short firstShortValue()
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A method to get the first Value of a Map.
      Angegeben von:
      firstShortValue in Schnittstelle Char2ShortOrderedMap
      Gibt zurück:
      the first key in the map

    • lastShortValue

      public short lastShortValue()
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A method to get the last Value of a Map.
      Angegeben von:
      lastShortValue in Schnittstelle Char2ShortOrderedMap
      Gibt zurück:
      the last key in the map

    • pollFirstCharKey

      public char pollFirstCharKey()
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A method to get and remove the first Key of a Map.
      Angegeben von:
      pollFirstCharKey in Schnittstelle Char2ShortOrderedMap
      Gibt zurück:
      the first key in the map

    • pollLastCharKey

      public char pollLastCharKey()
      Beschreibung aus Schnittstelle kopiert: Char2ShortOrderedMap
      A method to get and remove the last Key of a Map.
      Angegeben von:
      pollLastCharKey in Schnittstelle Char2ShortOrderedMap
      Gibt zurück:
      the last key in the map

    • remove

      public short remove(char key)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type Specific remove function to reduce boxing/unboxing
      Angegeben von:
      remove in Schnittstelle Char2ShortMap
      Parameter:
      key - the element that should be removed
      Gibt zurück:
      the value that was removed or default return value

    • removeOrDefault

      public short removeOrDefault(char key, short defaultValue)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type-Specific Remove function with a default return value if wanted.
      Angegeben von:
      removeOrDefault in Schnittstelle Char2ShortMap
      Parameter:
      key - the element that should be removed
      defaultValue - the value that should be returned if the entry doesn't exist
      Gibt zurück:
      the value that was removed or default value
      Siehe auch:

    • remove

      public boolean remove(char key, short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type Specific remove function to reduce boxing/unboxing
      Angegeben von:
      remove in Schnittstelle Char2ShortMap
      Parameter:
      key - the element that should be removed
      value - the expected value that should be found
      Gibt zurück:
      true if the key and value was found and removed
      Siehe auch:

    • remove

      public Short remove(Object key)
      Angegeben von:
      remove in Schnittstelle Char2ShortMap
      Angegeben von:
      remove in Schnittstelle Map<Character,Short>
      Setzt außer Kraft:
      remove in Klasse AbstractChar2ShortMap
      Parameter:
      key - the element that should be removed
      Gibt zurück:
      the value that was removed or default return value
      Siehe auch:

    • remove

      public boolean remove(Object key, Object value)
      Angegeben von:
      remove in Schnittstelle Char2ShortMap
      Angegeben von:
      remove in Schnittstelle Map<Character,Short>
      Parameter:
      key - the element that should be removed
      value - the expected value that should be found
      Gibt zurück:
      true if the key and value was found and removed
      Siehe auch:

    • forEach

      public void forEach(CharShortConsumer action)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type Specific forEach method to reduce boxing/unboxing
      Angegeben von:
      forEach in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      forEach in Klasse AbstractChar2ShortMap
      Parameter:
      action - processor of the values that are iterator over

    • keySet

      public CharOrderedSet keySet()
      Angegeben von:
      keySet in Schnittstelle Char2ShortMap
      Angegeben von:
      keySet in Schnittstelle Char2ShortOrderedMap
      Angegeben von:
      keySet in Schnittstelle Map<Character,Short>
      Setzt außer Kraft:
      keySet in Klasse AbstractChar2ShortMap

    • values

      public ShortCollection values()
      Angegeben von:
      values in Schnittstelle Char2ShortMap
      Angegeben von:
      values in Schnittstelle Map<Character,Short>
      Setzt außer Kraft:
      values in Klasse AbstractChar2ShortMap

    • char2ShortEntrySet

      public ObjectOrderedSet<Char2ShortMap.Entry> char2ShortEntrySet()
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      Type Sensitive EntrySet to reduce boxing/unboxing and optionally Temp Object Allocation.
      Angegeben von:
      char2ShortEntrySet in Schnittstelle Char2ShortMap
      Angegeben von:
      char2ShortEntrySet in Schnittstelle Char2ShortOrderedMap
      Gibt zurück:
      a EntrySet of the collection

    • replace

      public boolean replace(char key, short oldValue, short newValue)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific replace method to replace an existing value
      Angegeben von:
      replace in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      replace in Klasse AbstractChar2ShortMap
      Parameter:
      key - the element that should be searched for
      oldValue - the expected value to be replaced
      newValue - the value to replace the oldValue with.
      Gibt zurück:
      true if the value got replaced

    • replace

      public short replace(char key, short value)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific replace method to reduce boxing/unboxing replace an existing value
      Angegeben von:
      replace in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      replace in Klasse AbstractChar2ShortMap
      Parameter:
      key - the element that should be searched for
      value - the value to replace with.
      Gibt zurück:
      the present value or default return value

    • computeShort

      public short computeShort(char key, CharShortUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific compute method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeShort in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      computeShort in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value
      Gibt zurück:
      the result of the computation

    • computeShortIfAbsent

      public short computeShortIfAbsent(char key, Char2ShortFunction mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific computeIfAbsent method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeShortIfAbsent in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      computeShortIfAbsent in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value if not present
      Gibt zurück:
      the result of the computed value or present value

    • supplyShortIfAbsent

      public short supplyShortIfAbsent(char key, ShortSupplier valueProvider)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Supplier based computeIfAbsent function to fill the most used usecase of this function If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      supplyShortIfAbsent in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      supplyShortIfAbsent in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be computed
      valueProvider - the value if not present
      Gibt zurück:
      the result of the computed value or present value

    • computeShortIfPresent

      public short computeShortIfPresent(char key, CharShortUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific compute method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeShortIfPresent in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      computeShortIfPresent in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value if present
      Gibt zurück:
      the result of the default return value or present value

    • computeShortNonDefault

      public short computeShortNonDefault(char key, CharShortUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific compute method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeShortNonDefault in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      computeShortNonDefault in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value
      Gibt zurück:
      the result of the computation

    • computeShortIfAbsentNonDefault

      public short computeShortIfAbsentNonDefault(char key, Char2ShortFunction mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific computeIfAbsent method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeShortIfAbsentNonDefault in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      computeShortIfAbsentNonDefault in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value if not present
      Gibt zurück:
      the result of the computed value or present value

    • supplyShortIfAbsentNonDefault

      public short supplyShortIfAbsentNonDefault(char key, ShortSupplier valueProvider)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Supplier based computeIfAbsent function to fill the most used usecase of this function If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      supplyShortIfAbsentNonDefault in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      supplyShortIfAbsentNonDefault in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be computed
      valueProvider - the value if not present
      Gibt zurück:
      the result of the computed value or present value

    • computeShortIfPresentNonDefault

      public short computeShortIfPresentNonDefault(char key, CharShortUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific compute method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeShortIfPresentNonDefault in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      computeShortIfPresentNonDefault in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value if present
      Gibt zurück:
      the result of the default return value or present value

    • mergeShort

      public short mergeShort(char key, short value, ShortShortUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Type Specific merge method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      mergeShort in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      mergeShort in Klasse AbstractChar2ShortMap
      Parameter:
      key - the key that should be be searched for
      value - the value that should be merged with
      mappingFunction - the operator that should generate the new Value
      Gibt zurück:
      the result of the merge

    • mergeAllShort

      public void mergeAllShort(Char2ShortMap m, ShortShortUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Bulk method for merging Maps. If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      mergeAllShort in Schnittstelle Char2ShortMap
      Setzt außer Kraft:
      mergeAllShort in Klasse AbstractChar2ShortMap
      Parameter:
      m - the entries that should be bulk added
      mappingFunction - the operator that should generate the new Value

    • size

      public int size()
      Angegeben von:
      size in Schnittstelle Map<Character,Short>
      Setzt außer Kraft:
      size in Klasse AbstractMap<Character,Short>

    • clear

      public void clear()
      Angegeben von:
      clear in Schnittstelle Map<Character,Short>
      Setzt außer Kraft:
      clear in Klasse AbstractMap<Character,Short>

    • copy

      public Char2ShortArrayMap copy()
      Beschreibung aus Schnittstelle kopiert: Char2ShortMap
      A Function that does a shallow clone of the Map itself. This function is more optimized then a copy constructor since the Map does not have to be unsorted/resorted. It can be compared to Cloneable but with less exception risk
      Angegeben von:
      copy in Schnittstelle Char2ShortMap
      Angegeben von:
      copy in Schnittstelle Char2ShortOrderedMap
      Setzt außer Kraft:
      copy in Klasse AbstractChar2ShortMap
      Gibt zurück:
      a Shallow Copy of the Map