| java.lang.Object
 org.apache.tomcat.util.collections.SimpleHashtable
| SimpleHashtable | | final public class SimpleHashtable implements Enumeration(Code) | | This class implements a special purpose hashtable. It works like a
normal java.util.Hashtable except that:
- Keys to "get" are strings which are known to be interned,
so that "==" is used instead of "String.equals". (Interning
could be document-relative instead of global.)
- It's not synchronized, since it's to be used only by
one thread at a time.
- The keys () enumerator allocates no memory, with live
updates to the data disallowed.
- It's got fewer bells and whistles: fixed threshold and
load factor, no JDK 1.2 collection support, only keys can be
enumerated, things can't be removed, simpler inheritance; more.
The overall result is that it's less expensive to use these in
performance-critical locations, in terms both of CPU and memory,
than java.util.Hashtable instances. In this package
it makes a significant difference when normalizing attributes,
which is done for each start-element construct.
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| Constructor Summary | |
| public | SimpleHashtable(int initialCapacity)
Constructs a new, empty hashtable with the specified initial
capacity. | | public | SimpleHashtable()
Constructs a new, empty hashtable with a default capacity. |
| Method Summary | |
| public void | clear()
| | public Object | get(String key)
Returns the value to which the specified key is mapped in this
hashtable ... | | public Object | getInterned(String key)
Returns the value to which the specified key is mapped in this hashtable. | | public boolean | hasMoreElements()
Used to view this as an enumeration; returns true if there
are more keys to be enumerated. | | public Enumeration | keys()
Returns an enumeration of the keys in this hashtable. | | public Object | nextElement()
Used to view this as an enumeration; returns the next key
in the enumeration. | | public Object | put(Object key, Object value)
Maps the specified key to the specified
value in this hashtable. | | public Object | remove(Object key)
| | public int | size()
Returns the number of keys in this hashtable. |
| SimpleHashtable | | public SimpleHashtable(int initialCapacity)(Code) | | Constructs a new, empty hashtable with the specified initial
capacity.
Parameters:
initialCapacity - the initial capacity of the hashtable. |
| SimpleHashtable | | public SimpleHashtable()(Code) | | Constructs a new, empty hashtable with a default capacity.
|
| clear | | public void clear()(Code) | | |
| get | | public Object get(String key)(Code) | | Returns the value to which the specified key is mapped in this
hashtable ... the key isn't necessarily interned, though.
|
| getInterned | | public Object getInterned(String key)(Code) | | Returns the value to which the specified key is mapped in this hashtable.
|
| hasMoreElements | | public boolean hasMoreElements()(Code) | | Used to view this as an enumeration; returns true if there
are more keys to be enumerated.
|
| keys | | public Enumeration keys()(Code) | | Returns an enumeration of the keys in this hashtable.
an enumeration of the keys in this hashtable.
See Also: Enumeration |
| nextElement | | public Object nextElement()(Code) | | Used to view this as an enumeration; returns the next key
in the enumeration.
|
| put | | public Object put(Object key, Object value)(Code) | | Maps the specified key to the specified
value in this hashtable. Neither the key nor the
value can be null.
The value can be retrieved by calling the get method
with a key that is equal to the original key.
|
| size | | public int size()(Code) | | Returns the number of keys in this hashtable.
the number of keys in this hashtable. |
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