Changes the implementation of the prototype pattern (iluwatar#1103)

* Changes the implementation of the prototype pattern

* Fixes the checkstyle warnings

* Fixes additional checkstyle warnings

Author: dgruntz

prototype/src/main/java/com/iluwatar/prototype/Beast.java

@@ -26,9 +26,24 @@
 /**
  * Beast.
  */
-public abstract class Beast extends Prototype {
+public abstract class Beast implements Prototype {
+
+  public Beast() { }
+
+  public Beast(Beast source) { }
+
+  @Override
+  public abstract Beast copy();
 
   @Override
-  public abstract Beast copy() throws CloneNotSupportedException;
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null) {
+      return false;
+    }
+    return getClass() == obj.getClass();
+  }
 
 }

prototype/src/main/java/com/iluwatar/prototype/ElfBeast.java

@@ -35,11 +35,12 @@ public ElfBeast(String helpType) {
   }
 
   public ElfBeast(ElfBeast elfBeast) {
+    super(elfBeast);
     this.helpType = elfBeast.helpType;
   }
 
   @Override
-  public Beast copy() {
+  public ElfBeast copy() {
     return new ElfBeast(this);
   }
 
@@ -48,4 +49,26 @@ public String toString() {
     return "Elven eagle helps in " + helpType;
   }
 
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (!super.equals(obj)) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    ElfBeast other = (ElfBeast) obj;
+    if (helpType == null) {
+      if (other.helpType != null) {
+        return false;
+      }
+    } else if (!helpType.equals(other.helpType)) {
+      return false;
+    }
+    return true;
+  }
+
 }

prototype/src/main/java/com/iluwatar/prototype/ElfMage.java

@@ -28,14 +28,14 @@
  */
 public class ElfMage extends Mage {
 
-
   private String helpType;
 
   public ElfMage(String helpType) {
     this.helpType = helpType;
   }
 
   public ElfMage(ElfMage elfMage) {
+    super(elfMage);
     this.helpType = elfMage.helpType;
   }
 
@@ -49,4 +49,25 @@ public String toString() {
     return "Elven mage helps in " + helpType;
   }
 
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (!super.equals(obj)) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    ElfMage other = (ElfMage) obj;
+    if (helpType == null) {
+      if (other.helpType != null) {
+        return false;
+      }
+    } else if (!helpType.equals(other.helpType)) {
+      return false;
+    }
+    return true;
+  }
 }

prototype/src/main/java/com/iluwatar/prototype/ElfWarlord.java

@@ -35,6 +35,7 @@ public ElfWarlord(String helpType) {
   }
 
   public ElfWarlord(ElfWarlord elfWarlord) {
+    super(elfWarlord);
     this.helpType = elfWarlord.helpType;
   }
 
@@ -48,4 +49,25 @@ public String toString() {
     return "Elven warlord helps in " + helpType;
   }
 
-}
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (!super.equals(obj)) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    ElfWarlord other = (ElfWarlord) obj;
+    if (helpType == null) {
+      if (other.helpType != null) {
+        return false;
+      }
+    } else if (!helpType.equals(other.helpType)) {
+      return false;
+    }
+    return true;
+  }
+}

prototype/src/main/java/com/iluwatar/prototype/HeroFactoryImpl.java

@@ -45,33 +45,21 @@ public HeroFactoryImpl(Mage mage, Warlord warlord, Beast beast) {
    * Create mage.
    */
   public Mage createMage() {
-    try {
-      return mage.copy();
-    } catch (CloneNotSupportedException e) {
-      return null;
-    }
+    return mage.copy();
   }
 
   /**
    * Create warlord.
    */
   public Warlord createWarlord() {
-    try {
-      return warlord.copy();
-    } catch (CloneNotSupportedException e) {
-      return null;
-    }
+    return warlord.copy();
   }
 
   /**
    * Create beast.
    */
   public Beast createBeast() {
-    try {
-      return beast.copy();
-    } catch (CloneNotSupportedException e) {
-      return null;
-    }
+    return beast.copy();
   }
 
 }

prototype/src/main/java/com/iluwatar/prototype/Mage.java

@@ -26,9 +26,24 @@
 /**
  * Mage.
  */
-public abstract class Mage extends Prototype {
+public abstract class Mage implements Prototype {
+
+  public Mage() { }
+
+  public Mage(Mage source) { }
+
+  @Override
+  public abstract Mage copy();
 
   @Override
-  public abstract Mage copy() throws CloneNotSupportedException;
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null) {
+      return false;
+    }
+    return getClass() == obj.getClass();
+  }
 
 }

prototype/src/main/java/com/iluwatar/prototype/OrcBeast.java

@@ -35,11 +35,12 @@ public OrcBeast(String weapon) {
   }
 
   public OrcBeast(OrcBeast orcBeast) {
+    super(orcBeast);
     this.weapon = orcBeast.weapon;
   }
 
   @Override
-  public Beast copy() {
+  public OrcBeast copy() {
     return new OrcBeast(this);
   }
 
@@ -48,5 +49,27 @@ public String toString() {
     return "Orcish wolf attacks with " + weapon;
   }
 
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (!super.equals(obj)) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    OrcBeast other = (OrcBeast) obj;
+    if (weapon == null) {
+      if (other.weapon != null) {
+        return false;
+      }
+    } else if (!weapon.equals(other.weapon)) {
+      return false;
+    }
+    return true;
+  }
+
 
 }

prototype/src/main/java/com/iluwatar/prototype/OrcMage.java

@@ -35,6 +35,7 @@ public OrcMage(String weapon) {
   }
 
   public OrcMage(OrcMage orcMage) {
+    super(orcMage);
     this.weapon = orcMage.weapon;
   }
 
@@ -48,4 +49,25 @@ public String toString() {
     return "Orcish mage attacks with " + weapon;
   }
 
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (!super.equals(obj)) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    OrcMage other = (OrcMage) obj;
+    if (weapon == null) {
+      if (other.weapon != null) {
+        return false;
+      }
+    } else if (!weapon.equals(other.weapon)) {
+      return false;
+    }
+    return true;
+  }
 }

prototype/src/main/java/com/iluwatar/prototype/OrcWarlord.java

@@ -35,6 +35,7 @@ public OrcWarlord(String weapon) {
   }
 
   public OrcWarlord(OrcWarlord orcWarlord) {
+    super(orcWarlord);
     this.weapon = orcWarlord.weapon;
   }
 
@@ -48,4 +49,25 @@ public String toString() {
     return "Orcish warlord attacks with " + weapon;
   }
 
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (!super.equals(obj)) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    OrcWarlord other = (OrcWarlord) obj;
+    if (weapon == null) {
+      if (other.weapon != null) {
+        return false;
+      }
+    } else if (!weapon.equals(other.weapon)) {
+      return false;
+    }
+    return true;
+  }
 }

prototype/src/main/java/com/iluwatar/prototype/Prototype.java

@@ -26,8 +26,8 @@
 /**
  * Prototype.
  */
-public abstract class Prototype implements Cloneable {
+public interface Prototype {
 
-  public abstract Object copy() throws CloneNotSupportedException;
+  Object copy();
 
 }

prototype/src/main/java/com/iluwatar/prototype/Warlord.java

@@ -26,9 +26,24 @@
 /**
  * Warlord.
  */
-public abstract class Warlord extends Prototype {
+public abstract class Warlord implements Prototype {
+
+  public Warlord() { }
+
+  public Warlord(Warlord source) { }
+
+  @Override
+  public abstract Warlord copy();
 
   @Override
-  public abstract Warlord copy() throws CloneNotSupportedException;
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null) {
+      return false;
+    }
+    return getClass() == obj.getClass();
+  }
 
 }