Builder, Prototype, Singleton Assignments Completed

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

@@ -2,5 +2,94 @@
 
 @WithBuilder
 public class DatabaseConfigurationBuilder {
+    private String databaseUrl;
+    private String username;
+    private String password;
+    private int maxConnections;
+    private boolean enableCache;
+    private boolean isReadOnly;
+
+    private DatabaseConfigurationBuilder() {
+    }
+
+    public Builder builder() {
+        return new Builder();
+    }
+
+    public static class Builder {
+
+        private DatabaseConfigurationBuilder databaseConfigurationBuilder;
+
+        Builder() {
+            databaseConfigurationBuilder = new DatabaseConfigurationBuilder();
+        }
+
+        public Builder setDatabaseUrl(String databaseUrl) {
+            this.databaseConfigurationBuilder.databaseUrl = databaseUrl;
+            return this;
+        }
+
+        public Builder setUsername(String username) {
+            this.databaseConfigurationBuilder.username = username;
+            return this;
+        }
+
+        public Builder setPassword(String password) {
+            this.databaseConfigurationBuilder.password = password;
+            return this;
+
+        }
+
+        public Builder setMaxConnections(int maxConnections) {
+            this.databaseConfigurationBuilder.maxConnections = maxConnections;
+            return this;
+        }
+
+        public Builder setEnableCache(boolean enableCache) {
+            this.databaseConfigurationBuilder.enableCache = enableCache;
+            return this;
+
+        }
+
+        public Builder setReadOnly(boolean isReadOnly) {
+            this.databaseConfigurationBuilder.isReadOnly = isReadOnly;
+            return this;
+        }
+
+        public DatabaseConfigurationBuilder build(){
+            DatabaseConfigurationBuilder db=new DatabaseConfigurationBuilder();
+            db.databaseUrl=this.databaseConfigurationBuilder.databaseUrl;
+            db.enableCache=this.databaseConfigurationBuilder.enableCache;
+            db.isReadOnly=this.databaseConfigurationBuilder.isReadOnly;
+            db.maxConnections=this.databaseConfigurationBuilder.maxConnections;
+            db.password=this.databaseConfigurationBuilder.password;
+            db.username=this.databaseConfigurationBuilder.username;
+            return db;
+        }
+    }
+
+    public String getDatabaseUrl() {
+        return databaseUrl;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public int getMaxConnections() {
+        return maxConnections;
+    }
+
+    public boolean isEnableCache() {
+        return enableCache;
+    }
+
+    public boolean isReadOnly() {
+        return isReadOnly;
+    }
 
 }

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;
@@ -19,6 +19,44 @@ public Configuration(String themeColor, Boolean autoSave, String language, Boole
         this.type = type;
     }
 
+    public Configuration(Configuration reference) {
+        this.themeColor = reference.themeColor;
+        this.autoSave = reference.autoSave;
+        this.language = reference.language;
+        this.darkMode = reference.darkMode;
+        this.fontSize = reference.fontSize;
+        this.fontFamily = reference.fontFamily;
+        this.type = reference.type;
+    }
+
+    public void setThemeColor(String themeColor) {
+        this.themeColor = themeColor;
+    }
+
+    public void setAutoSave(Boolean autoSave) {
+        this.autoSave = autoSave;
+    }
+
+    public void setLanguage(String language) {
+        this.language = language;
+    }
+
+    public void setDarkMode(Boolean darkMode) {
+        this.darkMode = darkMode;
+    }
+
+    public void setFontSize(Integer fontSize) {
+        this.fontSize = fontSize;
+    }
+
+    public void setFontFamily(String fontFamily) {
+        this.fontFamily = fontFamily;
+    }
+
+    public void setType(ConfigurationType type) {
+        this.type = type;
+    }
+
     public String getThemeColor() {
         return themeColor;
     }
@@ -46,4 +84,9 @@ public String getFontFamily() {
     public ConfigurationType getType() {
         return type;
     }
+
+    @Override
+    public Configuration cloneObject() {
+        return new Configuration(this);
+    }
 }

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

@@ -1,7 +1,9 @@
 package com.scaler.lld.design.assignments.prototype;
 
-public interface ConfigurationPrototypeRegistry {
+import java.util.HashMap;
+import java.util.Map;
 
+public interface ConfigurationPrototypeRegistry {
     void addPrototype(Configuration user);
 
     Configuration getPrototype(ConfigurationType type);

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

@@ -0,0 +1,23 @@
+package com.scaler.lld.design.assignments.prototype;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Registry implements ConfigurationPrototypeRegistry{
+    private Map<ConfigurationType, Configuration> registry = new HashMap<>();
+    @Override
+    public void addPrototype(Configuration user) {
+        registry.put(user.getType(), user);
+    }
+
+    @Override
+    public Configuration getPrototype(ConfigurationType type) {
+        return registry.get(type);
+    }
+
+    @Override
+    public Configuration clone(ConfigurationType type) {
+        Configuration configuration = registry.get(type);
+        return configuration.cloneObject();
+    }
+}

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

@@ -1,49 +1,70 @@
 package com.scaler.lld.design.assignments.singleton;
 
 public class FileBasedConfigurationManagerImpl extends FileBasedConfigurationManager {
+    private static FileBasedConfigurationManager INSTANCE;
+
+    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'");
+        return this.properties.getProperty(key);
     }
 
     @Override
     public <T> T getConfiguration(String key, Class<T> type) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        //throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        T result = null;
+        String configuration = this.properties.getProperty(key);
+        if (configuration != null) {
+            result = convert(configuration, type);
+        }
+        return result;
     }
 
     @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'");
+        this.properties.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'");
+        this.properties.setProperty(key, String.valueOf(value));
     }
 
     @Override
     public void removeConfiguration(String key) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'removeConfiguration'");
+        //throw new UnsupportedOperationException("Unimplemented method 'removeConfiguration'");
+        this.properties.remove(key);
     }
 
     @Override
     public void clear() {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'clear'");
+        //throw new UnsupportedOperationException("Unimplemented method 'clear'");
+        this.properties.clear();
     }
 
     public static FileBasedConfigurationManager getInstance() {
-        // TODO Auto-generated method stub
-        return null;
+        if (INSTANCE == null) {
+            synchronized (FileBasedConfigurationManagerImpl.class) {
+                if(INSTANCE == null)
+                    INSTANCE = new FileBasedConfigurationManagerImpl();
+            }
+        }
+        return INSTANCE;
     }
 
     public static void resetInstance() {
+        INSTANCE = null;
         // TODO Auto-generated method stub
     }