fix getCompletions ideque --> icollection

src/edu/caltech/cs2/interfaces/ICollection.java

@@ -14,6 +14,16 @@ public interface ICollection<E> extends Iterable<E> {
    */
   public void add(E e);
 
+  /**
+   * Adds a collection of elements to this collection.
+   * @param c Collection of elements to add
+   */
+  default public void addAll(ICollection<E> c) {
+    for (E e : c) {
+      this.add(e);
+    }
+  }
+
   /**
    * Removes all elements from the collection.
    */

src/edu/caltech/cs2/interfaces/ITrieMap.java

@@ -13,7 +13,7 @@ public interface ITrieMap<A, K extends Iterable<A>, V> extends IDictionary<K, V>
      * @param prefix the prefix to search for in the trie
      * @return the values corresponding to the keys starting with the given prefix
      */
-    public IDeque<V> getCompletions(K prefix);
+    public ICollection<V> getCompletions(K prefix);
 
     /**
      * Removes all elements from the trie.

src/edu/caltech/cs2/project07/MapsAutoCompleter.java

@@ -3,6 +3,7 @@ package edu.caltech.cs2.project07;
 import edu.caltech.cs2.datastructures.LinkedDeque;
 import edu.caltech.cs2.datastructures.Location;
 import edu.caltech.cs2.datastructures.TrieMap;
+import edu.caltech.cs2.interfaces.ICollection;
 import edu.caltech.cs2.interfaces.IDeque;
 import edu.caltech.cs2.interfaces.ISet;
 import edu.caltech.cs2.interfaces.ITrieMap;
@@ -93,7 +94,7 @@ public class MapsAutoCompleter {
         String[] keyPath = term.strip().toLowerCase().split("\\s");
         IDeque<String> kpIterable = listFromArray(keyPath);
 
-        IDeque<IDeque<Location>> options = locs.getCompletions(kpIterable);
+        ICollection<IDeque<Location>> options = locs.getCompletions(kpIterable);
         options.addAll(locs.getCompletions(charArrToStringIterable(term.toLowerCase().toCharArray())));
 
         Set<Long> opts = new HashSet<>();