Package com.ctc.wstx.util

Class InternCache

java.lang.Object

java.util.AbstractMap<String,String>

java.util.HashMap<String,String>

java.util.LinkedHashMap<String,String>

com.ctc.wstx.util.InternCache

All Implemented Interfaces:

Serializable, Cloneable, Map<String,String>, SequencedMap<String,String>

public final class InternCache
extends LinkedHashMap<String,String>

Singleton class that implements "fast intern" functionality, essentially adding a layer that caches Strings that have been previously intern()ed, but that probably shouldn't be added to symbol tables. This is usually used by improving intern()ing of things like namespace URIs.

Note: that this class extends LinkedHashMap is an implementation detail -- no code should ever directly call Map methods.

See Also:

• Serialized Form

Nested Class Summary

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

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

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	DEFAULT_SIZE	Let's create cache big enough to usually have enough space for all entries...
private static final int	MAX_SIZE	Let's limit to hash area size of 1024.
private static final InternCache	sInstance

Constructor Summary

Constructors

Modifier	Constructor	Description
private	InternCache()

Method Summary

Modifier and Type	Method	Description
static InternCache	getInstance()
String	intern(String input)
protected boolean	removeEldestEntry(Map.Entry<String,String> eldest)

Methods inherited from class java.util.LinkedHashMap

clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, newLinkedHashMap, putFirst, putLast, replaceAll, reversed, sequencedEntrySet, sequencedKeySet, sequencedValues, values

Methods inherited from class java.util.HashMap

clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, newHashMap, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from class java.util.AbstractMap

equals, hashCode, 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, containsKey, equals, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from interface java.util.SequencedMap

firstEntry, lastEntry, pollFirstEntry, pollLastEntry

Field Details

DEFAULT_SIZE

private static final int DEFAULT_SIZE

Let's create cache big enough to usually have enough space for all entries... (assuming NS URIs only)

See Also:

• Constant Field Values

MAX_SIZE

private static final int MAX_SIZE

Let's limit to hash area size of 1024.

See Also:

• Constant Field Values

sInstance

private static final InternCache sInstance

Constructor Details

InternCache

private InternCache()

Method Details

getInstance

public static InternCache getInstance()

intern

public String intern(String input)

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<String,String> eldest)

Overrides:

removeEldestEntry in class LinkedHashMap<String,String>