/*
* Copyright (c) 2008, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.twelvemonkeys.util;
import java.io.
Serializable;
import java.util.
Iterator;
import java.util.
Map;
/**
* A {@code 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 {@code Strings}. If the keys
* used are not {@code String}s, it wil work as a normal
* {@code java.util.Map}.
* <p/>
*
* @see java.util.Map
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
*/
public class
IgnoreCaseMap<V> extends
AbstractDecoratedMap<
String, V> implements
Serializable,
Cloneable {
/**
* Constructs a new empty {@code Map}.
* The backing map will be a {@link java.util.HashMap}
*/
public
IgnoreCaseMap() {
super();
}
/**
* Constructs a new {@code Map} with the same key-value mappings as the
* given {@code Map}.
* The backing map will be a {@link java.util.HashMap}
* <p/>
* NOTE: As the keys in the given map parameter will be converted to
* uppercase (if they are strings), any duplicate key/value pair where
* {@code key instanceof String && key.equalsIgnoreCase(otherKey)}
* is true, will be lost.
*
* @param pMap the map whose mappings are to be placed in this map.
*/
public
IgnoreCaseMap(
Map<
String, ? extends V>
pMap) {
super(
pMap);
}
/**
* Constructs a new {@code Map} with the same key-value mappings as the
* given {@code Map}.
* <p/>
* NOTE: The backing map is structuraly cahnged, and it should NOT be
* accessed directly, after the wrapped map is created.
* <p/>
* NOTE: As the keys in the given map parameter will be converted to
* uppercase (if they are strings), any duplicate key/value pair where
* {@code key instanceof String && key.equalsIgnoreCase(otherKey)}
* is true, will be lost.
*
* @param pBacking the backing map of this map. Must be either empty, or
* the same map as {@code pContents}.
* @param pContents the map whose mappings are to be placed in this map.
* May be {@code null}
*
* @throws IllegalArgumentException if {@code pBacking} is {@code null}
* @throws IllegalArgumentException if {@code pBacking} differs from
* {@code pContent} and is not empty.
*/
public
IgnoreCaseMap(
Map pBacking,
Map<
String, ? extends V>
pContents) {
super(
pBacking,
pContents);
}
/**
* 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.
*
* @param pKey the map key.
* @param pValue the value.
* @return the previous value of the specified key in this map,
* or null if it did not have one.
*/
public V
put(
String pKey, V
pValue) {
String key = (
String)
toUpper(
pKey);
return
unwrap(
entries.
put(
key, new
BasicEntry<
String, V>(
key,
pValue)));
}
private V
unwrap(
Entry<
String, V>
pEntry) {
return
pEntry != null ?
pEntry.
getValue() : null;
}
/**
* 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.
*
* @param pKey a key in the map
* @return the value to which the key is mapped in this map; null if
* the key is not mapped to any value in this map.
*/
public V
get(
Object pKey) {
return
unwrap(
entries.
get(
toUpper(
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.
*
* @param pKey the key that needs to be removed.
* @return the value to which the key had been mapped in this map,
* or null if the key did not have a mapping.
*/
public V
remove(
Object pKey) {
return
unwrap(
entries.
remove(
toUpper(
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.
*
* @param pKey possible key.
* @return true if and only if the specified object is a key in this
* map, as determined by the equals method; false otherwise.
*/
public boolean
containsKey(
Object pKey) {
return
entries.
containsKey(
toUpper(
pKey));
}
/**
* Converts the parameter to uppercase, if it's a String.
*/
protected static
Object toUpper(final
Object pObject) {
if (
pObject instanceof
String) {
return ((
String)
pObject).
toUpperCase();
}
return
pObject;
}
protected
Iterator<
Entry<
String, V>>
newEntryIterator() {
return (
Iterator)
entries.
entrySet().
iterator();
}
protected
Iterator<
String>
newKeyIterator() {
return
entries.
keySet().
iterator();
}
protected
Iterator<V>
newValueIterator() {
return (
Iterator<V>)
entries.
values().
iterator();
}
}