// GenericsNote: Converted -- refactored heavily, and now must be a map of String -> ?.
/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package php.runtime.common.collections.map;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* A case-insensitive <code>Map</code>.
* <p/>
* As entries are added to the map, keys are converted to all lowercase. A new
* key is compared to existing keys by comparing <code>newKey.toLower()</code>
* to the lowercase values in the current <code>KeySet.</code>
* <p/>
* Null keys are supported.
* <p/>
* The <code>keySet()</code> method returns all lowercase keys, or nulls.
* <p/>
* Example:
* <pre><code>
* Map map = new CaseInsensitiveMap();
* map.put("One", "One");
* map.put("Two", "Two");
* map.put(null, "Three");
* map.put("one", "Four");
* </code></pre>
* creates a <code>CaseInsensitiveMap</code> with three entries.<br>
* <code>map.get(null)</code> returns <code>"Three"</code> and <code>map.get("ONE")</code>
* returns <code>"Four".</code> The <code>Set</code> returned by <code>keySet()</code>
* equals <code>{"one", "two", null}.</code>
*
* @author Matt Hall, John Watkinson, Commons-Collections team
* @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:32 $
* @since Commons Collections 3.0
*/
public class CaseInsensitiveMap <V> extends AbstractHashedMap<String, V> implements Serializable, Cloneable {
/**
* Serialisation version
*/
private static final long serialVersionUID = -7074655917369299456L;
/**
* Constructs a new empty map with default size and load factor.
*/
public CaseInsensitiveMap() {
super(DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_THRESHOLD);
}
/**
* Constructs a new, empty map with the specified initial capacity.
*
* @param initialCapacity the initial capacity
* @throws IllegalArgumentException if the initial capacity is less than one
*/
public CaseInsensitiveMap(int initialCapacity) {
super(initialCapacity);
}
/**
* Constructs a new, empty map with the specified initial capacity and
* load factor.
*
* @param initialCapacity the initial capacity
* @param loadFactor the load factor
* @throws IllegalArgumentException if the initial capacity is less than one
* @throws IllegalArgumentException if the load factor is less than zero
*/
public CaseInsensitiveMap(int initialCapacity, float loadFactor) {
super(initialCapacity, loadFactor);
}
/**
* Constructor copying elements from another map.
* <p/>
* Keys will be converted to lower case strings, which may cause
* some entries to be removed (if string representation of keys differ
* only by character case).
*
* @param map the map to copy
* @throws NullPointerException if the map is null
*/
public CaseInsensitiveMap(Map<? extends String, ? extends V> map) {
super(map);
}
//-----------------------------------------------------------------------
/**
* Converts keys to lower case.
* <p/>
* Returns null if key is null.
*
* @param key the key convert
* @return the converted key
*/
protected String convertKey(String key) {
if (key != null) {
return key.toLowerCase();
} else {
return null;
}
}
@Override public V get(Object key) {
if (!(key instanceof String)) {
return super.get(key);
}
return super.get(convertKey((String) key));
}
@Override public V put(String s, V v) {
return super.put(convertKey(s), v);
}
@Override public void putAll(Map<? extends String, ? extends V> map) {
Set entries = map.entrySet();
for (Iterator<Entry<? extends String, ? extends V>> iterator = entries.iterator(); iterator.hasNext();) {
Entry<? extends String, ? extends V> entry = iterator.next();
put(entry.getKey(), entry.getValue());
}
}
//-----------------------------------------------------------------------
/**
* Clones the map without cloning the keys or values.
*
* @return a shallow clone
*/
public Object clone() {
return super.clone();
}
/**
* Write the map out using a custom routine.
*/
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
doWriteObject(out);
}
/**
* Read the map in using a custom routine.
*/
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
doReadObject(in);
}
}