Week4. Create a new project and copy over your classes from the last exercise.

Author: SkyrocketStan

Week4/src/AllFilters.java

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+import java.util.ArrayList;
+
+public class AllFilters implements Filter {
+  ArrayList<Filter> filters;
+
+  public AllFilters() {
+    filters = new ArrayList<>();
+  }
+
+  public void addFilter(Filter f) {
+    filters.add(f);
+  }
+
+  @Override
+  public boolean satisfies(String id) {
+    for (Filter f : filters) {
+      if (!f.satisfies(id)) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}

Week4/src/DirectorsFilter.java

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+/**
+ * A class for filter movies by directors
+ *
+ * @author Stanislav Rakitov
+ * @version 1.0
+ */
+public class DirectorsFilter implements Filter {
+  String directors;
+
+  public DirectorsFilter(String directors) {
+    this.directors = directors;
+  }
+
+  @Override
+  public boolean satisfies(String id) {
+    String movieDirectors = MovieDatabase.getDirector(id);
+    String[] filterDirectors = directors.split(",");
+    for (String direcor : filterDirectors) {
+      if (movieDirectors.contains(direcor)) {
+        return true;
+      }
+    }
+    return false;
+  }
+}

Week4/src/EfficientRater.java

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+import java.util.ArrayList;
+import java.util.HashMap;
+
+/**
+ * The class EfficientRater keeps track of one rater and all their ratings.
+ *
+ * @author Stanislav Rakitov
+ * @version 1.0
+ */
+public class EfficientRater implements Rater {
+  private final String myID;
+  private final HashMap<String, Rating> myRatings;
+
+  public EfficientRater(String id) {
+    myID = id;
+    myRatings = new HashMap<>();
+  }
+
+  public void addRating(String movieID, Rating rating) {
+    myRatings.put(movieID, rating);
+  }
+
+  public boolean hasRating(String movieID) {
+    return myRatings.containsKey(movieID);
+  }
+
+  public String getID() {
+    return myID;
+  }
+
+  public double getRating(String movieID) {
+    Rating rating = myRatings.get(movieID);
+    if (rating != null) {
+      return rating.getValue();
+    } else {
+      return -1;
+    }
+  }
+
+  public int numRatings() {
+    return myRatings.size();
+  }
+
+  public ArrayList<String> getItemsRated() {
+    return new ArrayList<>(myRatings.keySet());
+  }
+}

Week4/src/Filter.java

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+public interface Filter {
+  boolean satisfies(String id);
+}