singleton pattern,builder pattern,prototype,simple factory

src/main/java/com/scaler/lld/design/assignments/builder/DatabaseConfigurationBuilder.java

@@ -2,5 +2,70 @@
 
 @WithBuilder
 public class DatabaseConfigurationBuilder {
+    private String databaseUrl;
+    private String username;
+    private String password;
+    private int maxConnections;
+    private boolean enableCache;
+    private boolean isReadOnly;
 
-}
+    /// immutable
+    private  DatabaseConfigurationBuilder() {
+
+    }
+
+    //// friend class
+    public static class Builder {
+
+        private String databaseUrl;
+        private String username;
+        private String password;
+        private int maxConnections;
+        private boolean enableCache;
+        private boolean isReadOnly;
+
+      private   Builder(){
+
+      } 
+
+
+        public Builder setDatabaseUrl(String databaseUrl) {
+            this.databaseUrl = databaseUrl;
+            return this;
+        }
+
+        public Builder setUsernameAndPassword(String username, String password) {
+            this.username = username;
+            this.password = password;
+            return this;
+        }
+
+        public Builder setMaxConnections(int maxConnections) {
+            this.maxConnections = maxConnections;
+            return this;
+        }
+
+        public Builder isEnableCache(boolean enableCache) {
+            this.enableCache = enableCache;
+            return this;
+        }
+
+        public Builder isReadOnly(boolean isReadOnly) {
+            this.isReadOnly = isReadOnly;
+            return this;
+        }
+
+        public DatabaseConfigurationBuilder build() {
+            DatabaseConfigurationBuilder obj =new DatabaseConfigurationBuilder();
+            obj.databaseUrl=this.databaseUrl;
+            obj.username=this.username;
+            obj.password=this.password;
+            obj.maxConnections=this.maxConnections;
+            obj.enableCache=this.enableCache;
+            obj.isReadOnly=this.isReadOnly;
+            return obj;
+        }
+
+    }
+
+}

src/main/java/com/scaler/lld/design/assignments/factory/AudioPlayer.java

@@ -2,5 +2,21 @@
 
 public abstract class AudioPlayer {
 
+    private int volume;
+    private double playBackRate;
+
+    AudioPlayer(int volume, double playBackRate) {
+        this.playBackRate = playBackRate;
+        this.volume = volume;
+    }
+
     public abstract MediaFormat supportsType();
+
+    public abstract void play();
+
+    public abstract void pause();
+
+    public abstract void stop();
+
+
 }

src/main/java/com/scaler/lld/design/assignments/factory/AudioPlayerFactory.java

@@ -1,4 +1,16 @@
 package com.scaler.lld.design.assignments.factory;
 
 public class AudioPlayerFactory {
+    static AudioPlayer createAudioPlayer(MediaFormat format, int volume, double playBackRate) {
+        if (format == MediaFormat.FLAC) {
+            FLACPlayer FlacObj = new FLACPlayer(volume, playBackRate);
+            return FlacObj;
+        } else if (format == MediaFormat.MP3) {
+            MP3Player Mp3Obj = new MP3Player(volume, playBackRate);
+            return Mp3Obj;
+        } else {
+            WAVPlayer WavObj = new WAVPlayer(volume, playBackRate);
+            return WavObj;
+        }
+    }
 }

src/main/java/com/scaler/lld/design/assignments/factory/FLACPlayer.java

@@ -1,12 +1,11 @@
 package com.scaler.lld.design.assignments.factory;
 
-public class FLACPlayer {
+public class FLACPlayer extends AudioPlayer {
     private int volume;
     private double playBackRate;
 
     public FLACPlayer(int volume, double playBackRate) {
-        this.volume = volume;
-        this.playBackRate = playBackRate;
+        super(volume, playBackRate);
     }
 
     public void play() {

src/main/java/com/scaler/lld/design/assignments/factory/MP3Player.java

@@ -1,12 +1,11 @@
 package com.scaler.lld.design.assignments.factory;
 
-public class MP3Player {
+public class MP3Player extends AudioPlayer {
     private int volume;
     private double playBackRate;
 
     public MP3Player(int volume, double playBackRate) {
-        this.volume = volume;
-        this.playBackRate = playBackRate;
+       super(volume, playBackRate);
     }
 
     public void play() {

src/main/java/com/scaler/lld/design/assignments/factory/WAVPlayer.java

@@ -1,12 +1,11 @@
 package com.scaler.lld.design.assignments.factory;
 
-public class WAVPlayer {
+public class WAVPlayer extends AudioPlayer {
     private int volume;
     private double playBackRate;
 
     public WAVPlayer(int volume, double playBackRate) {
-        this.volume = volume;
-        this.playBackRate = playBackRate;
+        super(volume, playBackRate);
     }
 
     public void play() {

src/main/java/com/scaler/lld/design/assignments/prototype/Configuration.java

@@ -1,6 +1,6 @@
 package com.scaler.lld.design.assignments.prototype;
 
-public class Configuration {
+public class Configuration implements ClonableObject {
     private String themeColor;
     private Boolean autoSave;
     private String language;
@@ -9,7 +9,8 @@ public class Configuration {
     private String fontFamily;
     private ConfigurationType type;
 
-    public Configuration(String themeColor, Boolean autoSave, String language, Boolean darkMode, Integer fontSize, String fontFamily, ConfigurationType type) {
+    public Configuration(String themeColor, Boolean autoSave, String language, Boolean darkMode, Integer fontSize,
+            String fontFamily, ConfigurationType type) {
         this.themeColor = themeColor;
         this.autoSave = autoSave;
         this.language = language;
@@ -19,6 +20,21 @@ public Configuration(String themeColor, Boolean autoSave, String language, Boole
         this.type = type;
     }
 
+    public Configuration() {
+
+    }
+
+    public Configuration Configuration(Configuration ref) {
+        ref.themeColor = this.themeColor;
+        ref.autoSave = this.autoSave;
+        ref.language = this.language;
+        ref.darkMode = this.darkMode;
+        ref.fontSize = this.fontSize;
+        ref.fontFamily = this.fontFamily;
+        ref.type = this.type;
+        return ref;
+    }
+
     public String getThemeColor() {
         return themeColor;
     }
@@ -46,4 +62,12 @@ public String getFontFamily() {
     public ConfigurationType getType() {
         return type;
     }
+
+    @Override
+    public Object cloneObject() {
+        Configuration ref = new Configuration();
+        return Configuration(ref);
+
+    }
+
 }

src/main/java/com/scaler/lld/design/assignments/prototype/Registry.java

@@ -0,0 +1,29 @@
+package com.scaler.lld.design.assignments.prototype;
+
+import java.util.HashMap;
+
+public class Registry implements ConfigurationPrototypeRegistry {
+
+    HashMap<ConfigurationType, Configuration> storage = new HashMap<>();
+
+    @Override
+    public void addPrototype(Configuration user) {
+
+        storage.put(user.getType(), user);
+
+    }
+
+    @Override
+    public Configuration getPrototype(ConfigurationType type) {
+
+        return storage.get(type);
+    }
+
+    @Override
+    public Configuration clone(ConfigurationType type) {
+
+        return (Configuration) storage.get(type).cloneObject();
+
+    }
+
+}

src/main/java/com/scaler/lld/design/assignments/singleton/FileBasedConfigurationManagerImpl.java

@@ -1,50 +1,81 @@
 package com.scaler.lld.design.assignments.singleton;
 
+import java.util.Properties;
+
 public class FileBasedConfigurationManagerImpl extends FileBasedConfigurationManager {
 
+    private static FileBasedConfigurationManagerImpl instance = null;
+    Properties s = this.properties;
+
+    private FileBasedConfigurationManagerImpl() {
+
+    }
+
     @Override
     public String getConfiguration(String key) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        // throw new UnsupportedOperationException("Unimplemented method
+        // 'getConfiguration'");
+        if (s.containsKey(key)) {
+            return s.getProperty(key);
+        } else {
+            return null;
+        }
+
     }
 
     @Override
     public <T> T getConfiguration(String key, Class<T> type) {
-        // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        T ans = null;
+        if (s.containsKey(key)) {
+            ans = convert(key, type);
+            return ans;
+        } else {
+            return ans;
+        }
     }
 
     @Override
     public void setConfiguration(String key, String value) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+        // throw new UnsupportedOperationException("Unimplemented method
+        // 'setConfiguration'");
+        s.setProperty(key, value);
     }
 
     @Override
     public <T> void setConfiguration(String key, T value) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+        // throw new UnsupportedOperationException("Unimplemented method
+        // 'setConfiguration'");
     }
 
     @Override
     public void removeConfiguration(String key) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'removeConfiguration'");
+        // throw new UnsupportedOperationException("Unimplemented method
+        // 'removeConfiguration'");
+        s.remove(key);
     }
 
     @Override
     public void clear() {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'clear'");
+        // throw new UnsupportedOperationException("Unimplemented method 'clear'");
+        s.clear();
     }
 
     public static FileBasedConfigurationManager getInstance() {
-        // TODO Auto-generated method stub
-        return null;
+        if (instance == null) {
+            instance = new FileBasedConfigurationManagerImpl();
+            return instance;
+        } else {
+            return instance;
+        }
     }
 
     public static void resetInstance() {
-        // TODO Auto-generated method stub
+        instance = null;
     }
 
 }