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/*******************************************************************************
* Copyright (c) 2005, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.module;
import java.util.*;
/*
* A MappedList maps values into keyed list arrays. All values with the same key are stored
* into the same array. Extending classes may override the sort method to sort the individual
* arrays in the MappedList. By default the MappedList appends new values to the end of the array.
*/
public class MappedList<K, V> {
// the mapping with key -> Object[] mapping
protected final HashMap<K, List<V>> internal = new HashMap<>();
protected final List<V> empty = Collections.<V> emptyList();
public void put(K key, V value) {
List<V> existing = internal.get(key);
if (existing == null) {
existing = new ArrayList<>(1);
existing.add(value);
internal.put(key, existing);
return;
}
// insert the new value
int index = insertionIndex(existing, value);
existing.add(index, value);
}
protected int insertionIndex(List<V> existing, V value) {
// a MappedList is by default not sorted so just insert at the end
// extending classes may override this method to provide an index that retains sorted order
return existing.size();
}
// removes all values with the specified key
public List<V> remove(K key) {
return get(key, true);
}
// gets all values with the specified key
public List<V> get(K key) {
return get(key, false);
}
// gets all values with the specified and optionally removes them
private List<V> get(K key, boolean remove) {
List<V> result = remove ? internal.remove(key) : internal.get(key);
return result == null ? empty : result;
}
// returns the number of keyed lists
public int getSize() {
return internal.size();
}
// returns all values of all keys
public List<V> getAllValues() {
if (getSize() == 0)
return empty;
ArrayList<V> results = new ArrayList<>(getSize());
Iterator<List<V>> iter = internal.values().iterator();
while (iter.hasNext())
results.addAll(iter.next());
return results;
}
// removes all keys from the map
public void clear() {
internal.clear();
}
}
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