net.sf.saxon.ma.map

Class DictionaryMap

java.lang.Object

net.sf.saxon.ma.map.MapItem

net.sf.saxon.ma.map.DictionaryMap

All Implemented Interfaces:

Callable, Function, GroundedValue, Item, Sequence

public class DictionaryMap
extends MapItem

A simple implementation of MapItem where the strings are keys, and modification is unlikely. This implementation is used in a number of cases where it can be determined that it is suitable, for example when parsing JSON input, or when creating a fixed map to use in an options argument.

Constructor Summary

Constructors

Constructor and Description
DictionaryMap() Create an empty dictionary, to which entries can be added using initialPut(String, GroundedValue), provided this is done before the map is exposed to the outside world.
DictionaryMap(int size) Create an empty dictionary, to which entries can be added using initialPut(String, GroundedValue), provided this is done before the map is exposed to the outside world.

Method Summary

Modifier and Type	Method and Description
MapItem	addEntry(AtomicValue key, GroundedValue value) Create a new map containing the existing entries in the map plus an additional entry, without modifying the original.
boolean	conforms(AtomicType keyType, SequenceType valueType, TypeHierarchy th) Ask whether the map conforms to a given map type
GroundedValue	get(AtomicValue key) Get an entry from the Map
ItemType	getItemType(TypeHierarchy th) Get the type of the map.
UType	getKeyUType() Get the lowest common item type of the keys in the map
void	initialAppend(java.lang.String key, GroundedValue value) During initial construction of the map, append a value to a possibly existing key-value pair
void	initialPut(java.lang.String key, GroundedValue value) During initial construction of the map, add a key-value pair
boolean	isEmpty() Ask whether the map is empty
AtomicIterator	keys() Get the set of all key values in the map.
java.lang.Iterable<KeyValuePair>	keyValuePairs() Get the set of all key-value pairs in the map
MapItem	remove(AtomicValue key) Remove an entry from the map
int	size() Get the size of the map

Methods inherited from class net.sf.saxon.ma.map.MapItem

atomize, call, deepEquals, effectiveBooleanValue, export, getAnnotations, getArity, getDescription, getFunctionItemType, getFunctionName, getGenre, getItemTypeOfSequence, getOperandRoles, getTypedValue, getUnicodeStringValue, isArray, isKnownToConform, isMap, isTrustedResultType, itemAt, makeNewContext, mapToString, toShortString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface net.sf.saxon.om.Function

isSequenceVariadic

Methods inherited from interface net.sf.saxon.om.Item

getLength, getStringValue, head, isStreamed, iterate, reduce, subsequence

Methods inherited from interface net.sf.saxon.om.GroundedValue

asIterable, concatenate, containsNode, materialize

Methods inherited from interface net.sf.saxon.om.Sequence

makeRepeatable

Constructor Detail

DictionaryMap

public DictionaryMap()

Create an empty dictionary, to which entries can be added using initialPut(String, GroundedValue), provided this is done before the map is exposed to the outside world.

DictionaryMap

public DictionaryMap(int size)

Create an empty dictionary, to which entries can be added using initialPut(String, GroundedValue), provided this is done before the map is exposed to the outside world.

Parameters:

size - estimated final size of the dictionary

Method Detail

initialPut

public void initialPut(java.lang.String key,
                       GroundedValue value)

During initial construction of the map, add a key-value pair

Parameters:

key - the key

value - the corresponding value

initialAppend

public void initialAppend(java.lang.String key,
                          GroundedValue value)

During initial construction of the map, append a value to a possibly existing key-value pair

Parameters:

key - the key

value - the corresponding value

get

public GroundedValue get(AtomicValue key)

Get an entry from the Map

Specified by:

get in class MapItem

Parameters:

key - the value of the key

Returns:

the value associated with the given key, or null if the key is not present in the map.

size

public int size()

Get the size of the map

Specified by:

size in class MapItem

Returns:

the number of keys/entries present in this map

isEmpty

public boolean isEmpty()

Ask whether the map is empty

Overrides:

isEmpty in class MapItem

Returns:

true if and only if the size of the map is zero

keys

public AtomicIterator keys()

Get the set of all key values in the map.

Specified by:

keys in class MapItem

Returns:

a set containing all the key values present in the map, in unpredictable order

keyValuePairs

public java.lang.Iterable<KeyValuePair> keyValuePairs()

Get the set of all key-value pairs in the map

Specified by:

keyValuePairs in class MapItem

Returns:

an iterable containing all the key-value pairs

addEntry

public MapItem addEntry(AtomicValue key,
                        GroundedValue value)

Create a new map containing the existing entries in the map plus an additional entry, without modifying the original. If there is already an entry with the specified key, this entry is replaced by the new entry.

Specified by:

addEntry in class MapItem

Parameters:

key - the key of the new entry

value - the value associated with the new entry

Returns:

the new map containing the additional entry

remove

public MapItem remove(AtomicValue key)

Remove an entry from the map

Specified by:

remove in class MapItem

Parameters:

key - the key of the entry to be removed

Returns:

a new map in which the requested entry has been removed; or this map unchanged if the specified key was not present

conforms

public boolean conforms(AtomicType keyType,
                        SequenceType valueType,
                        TypeHierarchy th)

Ask whether the map conforms to a given map type

Specified by:

conforms in class MapItem

Parameters:

keyType - the required keyType

valueType - the required valueType

th - the type hierarchy cache for the configuration

Returns:

true if the map conforms to the required type

getItemType

public ItemType getItemType(TypeHierarchy th)

Get the type of the map. This method is used largely for diagnostics, to report the type of a map when it differs from the required type.

Specified by:

getItemType in class MapItem

Parameters:

th - the type hierarchy cache

Returns:

the type of this map

getKeyUType

public UType getKeyUType()

Get the lowest common item type of the keys in the map

Specified by:

getKeyUType in class MapItem

Returns:

the most specific type to which all the keys belong. If the map is empty, return UType.VOID