Brazil project: Class StringMap

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sunlabs.brazil.util Class StringMap

java.lang.Object
  |
  +--java.util.Dictionary
        |
        +--sunlabs.brazil.util.StringMap

Direct Known Subclasses:: MimeHeaders

public class StringMap
extends Dictionary

The StringMap class is a substitute for the Hashtable. The StringMap has the following properties:

Maps case-insensitive string keys to string values.
The case of the keys is preserved.
Values may be null.
Preserves the relative order of the data.
The same key may appear multiple times in a single map.
This map is implemented via a Vector, and as such, as the number of keys increases, the time required to search will go up.

Constructor Summary
`StringMap()` Creates an empty StringMap.

Method Summary
`void`	`add(String key, String value)` Maps the given case-insensitive key to the specified value in this StringMap.
`void`	`clear()` Removes all the keys and values from this StringMap.
`Enumeration`	`elements()` Returns an enumeration of the values in this StringMap.
`String`	`get(int index)` Returns the value at the specified index.
`Object`	`get(Object key)` Performs the same job as `get(String)`.
`String`	`get(String key)` Returns the value that the specified case-insensitive key maps to in this StringMap.
`String`	`getKey(int index)` Returns the key at the specified index.
`boolean`	`isEmpty()` Tests if there are any elements in this StringMap.
`Enumeration`	`keys()` Returns an enumeration of the keys in this StringMap.
`void`	`put(int index, String value)` Maps the key at the given index to the specified value in this StringMap.
`Object`	`put(Object key, Object value)` Performs the same job as `put(String, String)`.
`void`	`put(String key, String value)` Maps the given case-insensitive key to the specified value in this StringMap.
`void`	`remove(int i)`
`Object`	`remove(Object key)` Performs the same job as `remove(String)`.
`void`	`remove(String key)` Removes the given case-insensitive key and its corresponding value from this StringMap.
`int`	`size()` Returns the number of elements in this StringMap.
`String`	`toString()` Returns a string representation of this `StringMap` in the form of a set of entries, enclosed in braces and separated by the characters ", ".

Methods inherited from class java.lang.Object

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

Constructor Detail

StringMap

public StringMap()

Creates an empty StringMap.

Method Detail

size

public int size()

Returns the number of elements in this StringMap. Every occurrence of keys that appear multiple times is counted.

Overrides:: size in class Dictionary

Returns:: The number of elements in this StringMap.
See Also:: keys()

isEmpty

public boolean isEmpty()

Tests if there are any elements in this StringMap.

Overrides:: isEmpty in class Dictionary

Returns:: Returns true if there are no elements, false otherwise.

keys

public Enumeration keys()

Returns an enumeration of the keys in this StringMap. The elements of the enumeration are strings.

The same key may appear multiple times in the enumeration, not necessarily consecutively. Since get always returns the value associated with the first occurrence of a given key, a StringMap cannot be enumerated in the same fashion as a Hashtable. Instead, the caller should use:

 Enumeration keys = map.keys();
 Enumeration values = map.elements();
 while (keys.hasMoreElements()) {
     String key = (String) keys.nextElement();
     String value = (String) values.nextElement();
 }

or:

 for (int i = 0; i < map.size(); i++) {
     String key = map.getKey(i);
     String value = map.get(i);
 }

Overrides:: keys in class Dictionary

Returns:: An enumeration of the keys.
See Also:: elements(), size(), getKey(int), get(int)

elements

public Enumeration elements()

Returns an enumeration of the values in this StringMap. The elements of the enumeration are strings.

Overrides:: elements in class Dictionary

Returns:: An enumeration of the values.
See Also:: keys()

getKey

public String getKey(int index)
              throws IndexOutOfBoundsException

Returns the key at the specified index. The index ranges from 0 to size() - 1.

This method can be used to iterate over all the keys in this StringMap in the order in which they were inserted, subject to any intervening deletions.

Parameters:: index - The index of the key.
Returns:: The key at the specified index.
Throws:: IndexOutOfBoundsException - if the index is out of the allowed range.

get

public String get(int index)
           throws IndexOutOfBoundsException

Returns the value at the specified index. The index ranges from 0 to size() - 1.

This method can be used to iterate over all the values in this StringMap in the order in which they were inserted, subject to any intervening deletions.

Parameters:: index - The index of the key.
Returns:: The value at the specified index.
Throws:: IndexOutOfBoundsException - if the index is out of the allowed range.

get

public String get(String key)

Returns the value that the specified case-insensitive key maps to in this StringMap.

The same key may appear multiple times in the enumeration; this method always returns the value associated with the first occurrence of the specified key. In order to get all the values, it is necessary to iterate over the entire StringMap to retrieve all the values associated with a given key.

Parameters:: key - A key in this StringMap. May not be null.
Returns:: The value to which the specified key is mapped, or null if the key is not in the StringMap.
See Also:: keys()

get

public Object get(Object key)

Performs the same job as get(String). It exists so this class can extend the Dictionary class.

Overrides:: get in class Dictionary

Parameters:: key - Must be a String.
Returns:: A String value.
Throws:: ClassCastException - if the key is not a String.
See Also:: get(String)

put

public void put(int index,
                String value)

Maps the key at the given index to the specified value in this StringMap. The index ranges from 0 to size() - 1.

Parameters:: index - The index of the key.
Returns:: The value at the specified index.
Throws:: IndexOutOfBoundsException - if the index is out of the allowed range.

put

public void put(String key,
                String value)

Maps the given case-insensitive key to the specified value in this StringMap.

The value can be retrieved by calling get with a key that is case-insensitive equal to the given key.

If this StringMap already contained a mapping for the given key, the old value is forgotten and the new specified value is used. The case of the prior key is retained in that case. Otherwise the case of the new key is used.

Parameters:: key - The new key. May not be null.; value - The new value. May be null.
Returns:: The previous value to which key was mapped, or null if the the key did not map to any value.

put

public Object put(Object key,
                  Object value)

Performs the same job as put(String, String). It exists so this class can extend the Dictionary class.

Overrides:: put in class Dictionary

Parameters:: key - Must be a String.; value - Must be a String.
Returns:: The previous value to which key was mapped, or null if the the key did not map to any value.
Throws:: ClassCastException - if the key or value is not a String.
See Also:: put(String, String)

add

public void add(String key,
                String value)

Maps the given case-insensitive key to the specified value in this StringMap.

The new mapping is added to this StringMap even if the given key already has a mapping. In this way it is possible to create a key that maps to two or more values.

Since the same key may appear multiple times in this StringMap, it is necessary to iterate over the entire StringMap to retrieve all values associated with a given key.

Parameters:: key - The new key. May not be null.; value - The new value. May be null.
See Also:: put(String, String), keys()

remove

public void remove(String key)

Removes the given case-insensitive key and its corresponding value from this StringMap. This method does nothing if the key is not in this StringMap.

The same key may appear in multiple times in this StringMap; this method only removes the first occurrence of the key.

Parameters:: key - The key that needs to be removed. Must not be null.

remove

public void remove(int i)

remove

public Object remove(Object key)

Performs the same job as remove(String). It exists so this class can extend the Dictionary class.

Overrides:: remove in class Dictionary

Parameters:: key - Must be a String.
Returns:: The string value to which the key had been mapped, or null if the key did not have a mapping.
Throws:: ClassCastException - if the key is not a String.

clear

public void clear()

Removes all the keys and values from this StringMap.

toString

public String toString()

Returns a string representation of this StringMap in the form of a set of entries, enclosed in braces and separated by the characters ", ". Each entry is rendered as the key, an equals sign "=", and the associated value.

Overrides:: toString in class Object

Returns:: The string representation of this StringMap.

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