Class BasicRowProcessor.CaseInsensitiveHashMap

java.lang.Object

java.util.AbstractMap<String,Object>

java.util.HashMap<String,Object>

java.util.LinkedHashMap<String,Object>

org.apache.commons.dbutils.BasicRowProcessor.CaseInsensitiveHashMap

All Implemented Interfaces:

Serializable, Cloneable, Map<String,Object>

Enclosing class:

BasicRowProcessor

private static final class BasicRowProcessor.CaseInsensitiveHashMap
extends LinkedHashMap<String,Object>

A Map that converts all keys to lowercase Strings for case insensitive lookups. This is needed for the toMap() implementation because databases don't consistently handle the casing of column names.

The keys are stored as they are given [BUG #DBUTILS-34], so we maintain an internal mapping from lowercase keys to the real keys in order to achieve the case insensitive lookup.

Note: This implementation does not allow null for key, whereas LinkedHashMap does, because of the code:

key.toString().toLowerCase()

Nested Class Summary

Nested classes/interfaces inherited from class AbstractMap

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

Nested classes/interfaces inherited from interface Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<String,String>	lowerCaseMap	The internal mapping from lowercase keys to the real keys.
private static final long	serialVersionUID	Required for serialization support.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	CaseInsensitiveHashMap(int initialCapacity)

Method Summary

Modifier and Type	Method	Description
boolean	containsKey(Object key)
Object	get(Object key)
Object	put(String key, Object value)
void	putAll(Map<? extends String, ?> m)
Object	remove(Object key)

Methods inherited from class LinkedHashMap

clear, containsValue, entrySet, forEach, getOrDefault, keySet, removeEldestEntry, replaceAll, values

Methods inherited from class HashMap

clone, compute, computeIfAbsent, computeIfPresent, isEmpty, merge, putIfAbsent, remove, replace, replace, size

Methods inherited from class AbstractMap

equals, hashCode, toString

Methods inherited from class Object

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

Methods inherited from interface Map

compute, computeIfAbsent, computeIfPresent, equals, hashCode, isEmpty, merge, putIfAbsent, remove, replace, replace, size

Field Details

lowerCaseMap

private final Map<String,String> lowerCaseMap

The internal mapping from lowercase keys to the real keys.

Any query operation using the key (get(Object), containsKey(Object)) is done in three steps:

• convert the parameter key to lower case
• get the actual key that corresponds to the lower case key
• query the map with the actual key

serialVersionUID

private static final long serialVersionUID

Required for serialization support.

See Also:

• Serializable
• Constant Field Values

Constructor Details

CaseInsensitiveHashMap

private CaseInsensitiveHashMap(int initialCapacity)

Method Details

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<String,Object>

Overrides:

containsKey in class HashMap<String,Object>

get

public Object get(Object key)

Specified by:

get in interface Map<String,Object>

Overrides:

get in class LinkedHashMap<String,Object>

put

public Object put(String key,
 Object value)

Specified by:

put in interface Map<String,Object>

Overrides:

put in class HashMap<String,Object>

putAll

public void putAll(Map<? extends String, ?> m)

Specified by:

putAll in interface Map<String,Object>

Overrides:

putAll in class HashMap<String,Object>

remove

public Object remove(Object key)

Specified by:

remove in interface Map<String,Object>

Overrides:

remove in class HashMap<String,Object>