Implement missing equals and hashcode methods for feeditem (#7132)

Till 5713b18267 many classes like FeedItem
used to inherit from FeedComponent which provided those two methods.
However since that commit the component no longer exists and now the
classes need to implement it on their own. Without this, ArrayList.remove breaks.

model/src/main/java/de/danoeh/antennapod/model/feed/Chapter.java

@@ -1,6 +1,7 @@
 package de.danoeh.antennapod.model.feed;
 
 import java.util.List;
+import java.util.Objects;
 
 public class Chapter {
     private long id;
@@ -88,4 +89,22 @@ public class Chapter {
         }
         return chapters.size() - 1;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        Chapter chapter = (Chapter) o;
+        return id == chapter.id;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
 }

model/src/main/java/de/danoeh/antennapod/model/feed/Feed.java

@@ -5,6 +5,8 @@ import androidx.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
+import java.util.Objects;
+
 import org.apache.commons.lang3.StringUtils;
 
 /**
@@ -468,4 +470,22 @@ public class Feed {
     public boolean isLocalFeed() {
         return downloadUrl.startsWith(PREFIX_LOCAL_FOLDER);
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        Feed feed = (Feed) o;
+        return id == feed.id;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
 }

model/src/main/java/de/danoeh/antennapod/model/feed/FeedItem.java

@@ -11,6 +11,7 @@ import java.io.Serializable;
 import java.util.Date;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
 
 /**
@@ -418,4 +419,22 @@ public class FeedItem implements Serializable {
     public String toString() {
         return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        FeedItem feedItem = (FeedItem) o;
+        return id == feedItem.id;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
 }

model/src/main/java/de/danoeh/antennapod/model/feed/FeedMedia.java

@@ -501,12 +501,21 @@ public class FeedMedia implements Playable {
 
     @Override
     public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
         if (o == null) {
             return false;
         }
         if (o instanceof RemoteMedia) {
             return o.equals(this);
         }
-        return super.equals(o);
+
+        if (getClass() != o.getClass()) {
+            return false;
+        }
+
+        FeedMedia feedMedia = (FeedMedia) o;
+        return id == feedMedia.id;
     }
 }