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- /*
- * Copyright (c) 2006-2010 Chris Smith, Shane Mc Cormack, Gregory Holmes
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
- package com.dmdirc.util;
-
- import java.util.ArrayList;
- import java.util.HashSet;
- import java.util.List;
- import java.util.Set;
-
- /**
- * An object that maps keys to values, and values back to keys. Currently
- * does no checking for duplicates. Does not allow null values.
- *
- * @param <A> The first type of data to be mapped
- * @param <B> The second type of data to be mapped
- * @author chris
- */
- public class DoubleMap<A,B> {
-
- /** The keys in this map. */
- protected final List<A> keys = new ArrayList<A>();
- /** The values in this map. */
- protected final List<B> values = new ArrayList<B>();
-
- /**
- * Adds the specified pair to this map.
- *
- * @param key The key for the map
- * @param value The value for the map
- */
- public void put(final A key, final B value) {
- if (key == null || value == null) {
- throw new NullPointerException();
- }
-
- keys.add(key);
- values.add(value);
- }
-
- /**
- * Retrieves the value associated with the specified key.
- *
- * @param key The key to search for
- * @return The value of the specified key
- */
- public B getValue(final A key) {
- return values.get(keys.indexOf(key));
- }
-
- /**
- * Retrieves the key associated with the specified value.
- *
- * @param value The value to search for
- * @return The key of the specified value
- */
- public A getKey(final B value) {
- return keys.get(values.indexOf(value));
- }
-
- /**
- * Retrieves the set of keys in this double map.
- *
- * @return This map's key set
- */
- public Set<A> keySet() {
- return new HashSet<A>(keys);
- }
-
- /**
- * Retrieves the set of values in this double map.
- *
- * @return This map's value set
- */
- public Set<B> valueSet() {
- return new HashSet<B>(values);
- }
-
- }
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