com.twelvemonkeys.util

Class IgnoreCaseMap<V>

java.lang.Object

java.util.AbstractMap<K,V>

com.twelvemonkeys.util.IgnoreCaseMap<V>

All Implemented Interfaces:

Serializable, Cloneable, Map<String,V>

public class IgnoreCaseMap<V>
extends AbstractMap<K,V>
implements Serializable, Cloneable

A Map decorator that makes the mappings in the backing map case insensitive (this is implemented by converting all keys to uppercase), if the keys used are Strings. If the keys used are not Strings, it wil work as a normal java.util.Map.

Author:

Harald Kuhr

See Also:

Map, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<K,Map.Entry<K,V>>	entries
protected int	modCount

Constructor Summary

Constructors

Constructor and Description
IgnoreCaseMap() Constructs a new empty Map.
IgnoreCaseMap(Map<String,? extends V> pMap) Constructs a new Map with the same key-value mappings as the given Map.
IgnoreCaseMap(Map pBacking, Map<String,? extends V> pContents) Constructs a new Map with the same key-value mappings as the given Map.

Method Summary

Modifier and Type	Method and Description
void	clear()
protected Object	clone() Returns a shallow copy of this AbstractMap instance: the keys and values themselves are not cloned.
boolean	containsKey(Object pKey) Tests if the specified object is a key in this map.
boolean	containsValue(Object pValue) Returns true if this map maps one or more keys to the specified pValue.
Set<Map.Entry<K,V>>	entrySet()
V	get(Object pKey) Returns the value to which the specified key is mapped in this map.
protected void	init() Default implementation, does nothing.
boolean	isEmpty()
Set<K>	keySet()
protected Iterator<Map.Entry<String,V>>	newEntryIterator()
protected Iterator<String>	newKeyIterator()
protected Iterator<V>	newValueIterator()
V	put(String pKey, V pValue) Maps the specified key to the specified value in this map.
V	remove(Object pKey) Removes the key (and its corresponding value) from this map.
protected Map.Entry<K,V>	removeEntry(Map.Entry<K,V> pEntry) Removes the given entry from the Map.
int	size()
protected static Object	toUpper(Object pObject) Converts the parameter to uppercase, if it's a String.
Collection<V>	values()

Methods inherited from class java.util.AbstractMap

equals, hashCode, putAll, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putAll, putIfAbsent, remove, replace, replace, replaceAll

Field Detail

entries

protected Map<K,Map.Entry<K,V>> entries

modCount

protected transient volatile int modCount

Constructor Detail

IgnoreCaseMap

public IgnoreCaseMap()

Constructs a new empty Map. The backing map will be a HashMap

IgnoreCaseMap

public IgnoreCaseMap(Map<String,? extends V> pMap)

Constructs a new Map with the same key-value mappings as the given Map. The backing map will be a HashMap

NOTE: As the keys in the given map parameter will be converted to uppercase (if they are strings), any duplicate key/value pair where key instanceof String && key.equalsIgnoreCase(otherKey) is true, will be lost.

Parameters:

pMap - the map whose mappings are to be placed in this map.

IgnoreCaseMap

public IgnoreCaseMap(Map pBacking,
                     Map<String,? extends V> pContents)

Constructs a new Map with the same key-value mappings as the given Map.

NOTE: The backing map is structuraly cahnged, and it should NOT be accessed directly, after the wrapped map is created.

NOTE: As the keys in the given map parameter will be converted to uppercase (if they are strings), any duplicate key/value pair where key instanceof String && key.equalsIgnoreCase(otherKey) is true, will be lost.

Parameters:

pBacking - the backing map of this map. Must be either empty, or the same map as pContents.

pContents - the map whose mappings are to be placed in this map. May be null

Throws:

IllegalArgumentException - if pBacking is null

IllegalArgumentException - if pBacking differs from pContent and is not empty.

Method Detail

put

public V put(String pKey,
             V pValue)

Maps the specified key to the specified value in this map. Note: If the key used is a string, the key will not be case-sensitive.

Specified by:

put in interface Map<String,V>

Parameters:

pKey - the map key.

pValue - the value.

Returns:

the previous value of the specified key in this map, or null if it did not have one.

get

public V get(Object pKey)

Returns the value to which the specified key is mapped in this map. Note: If the key used is a string, the key will not be case-sensitive.

Specified by:

get in interface Map<String,V>

Parameters:

pKey - a key in the map

Returns:

the value to which the key is mapped in this map; null if the key is not mapped to any value in this map.

remove

public V remove(Object pKey)

Removes the key (and its corresponding value) from this map. This method does nothing if the key is not in the map. Note: If the key used is a string, the key will not be case-sensitive.

Specified by:

remove in interface Map<String,V>

Parameters:

pKey - the key that needs to be removed.

Returns:

the value to which the key had been mapped in this map, or null if the key did not have a mapping.

containsKey

public boolean containsKey(Object pKey)

Tests if the specified object is a key in this map. Note: If the key used is a string, the key will not be case-sensitive.

Specified by:

containsKey in interface Map<String,V>

Parameters:

pKey - possible key.

Returns:

true if and only if the specified object is a key in this map, as determined by the equals method; false otherwise.

toUpper

protected static Object toUpper(Object pObject)

Converts the parameter to uppercase, if it's a String.

newEntryIterator

protected Iterator<Map.Entry<String,V>> newEntryIterator()

newKeyIterator

protected Iterator<String> newKeyIterator()

newValueIterator

protected Iterator<V> newValueIterator()

init

protected void init()

Default implementation, does nothing.

size

public int size()

Specified by:

size in interface Map<K,V>

Overrides:

size in class AbstractMap<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class AbstractMap<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

Overrides:

isEmpty in class AbstractMap<K,V>

containsValue

public boolean containsValue(Object pValue)

Returns true if this map maps one or more keys to the specified pValue. More formally, returns true if and only if this map contains at least one mapping to a pValue v such that (pValue==null ? v==null : pValue.equals(v)).

This implementation requires time linear in the map size for this operation.

Specified by:

containsValue in interface Map<K,V>

Overrides:

containsValue in class AbstractMap<K,V>

Parameters:

pValue - pValue whose presence in this map is to be tested.

Returns:

true if this map maps one or more keys to the specified pValue.

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

Overrides:

values in class AbstractMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

Overrides:

keySet in class AbstractMap<K,V>

clone

protected Object clone()
                throws CloneNotSupportedException

Returns a shallow copy of this AbstractMap instance: the keys and values themselves are not cloned.

Overrides:

clone in class AbstractMap<K,V>

Returns:

a shallow copy of this map.

Throws:

CloneNotSupportedException

removeEntry

protected Map.Entry<K,V> removeEntry(Map.Entry<K,V> pEntry)

Removes the given entry from the Map.

Parameters:

pEntry - the entry to be removed

Returns:

the removed entry, or null if nothing was removed.