DefaultGroupedIterable.java :  » GWT » reactive4java » hu » akarnokd » reactive4java » Java Open Source

/*
 * Copyright 2011 David Karnok
 *
 * 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 hu.akarnokd.reactive4java;

import java.util.Iterator;
import java.util.LinkedList;

/**
 * The default implementation for a grouped iterable
 * which holds the values in a <code>LinkedList</code>.
 * @param <K> the key type
 * @param <V> the value type
 * @author akarnokd, 2011.02.03.
 */
public class DefaultGroupedIterable<K, V> implements GroupedIterable<K, V> {
  /** The key. */
  private final K key;
  /** The group content. */
  private final LinkedList<V> values = new LinkedList<V>();
  /**
   * Constructor.
   * @param key the group key
   */
  public DefaultGroupedIterable(K key) {
    this.key = key;
  }
  @Override
  public K key() {
    return key;
  }
  @Override
  public Iterator<V> iterator() {
    return values.iterator();
  }
  /**
   * Adds one element to the values.
   * @param value the value
   */
  public void add(V value) {
    values.add(value);
  }
  /**
   * Add the values of the target iterable.
   * @param values the values to add
   */
  public void add(Iterable<V> values) {
    for (V v : values) {
      this.values.add(v);
    }
  }
}