assignment-design-pattern

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

@@ -1,5 +1,10 @@
 package com.scaler.lld.design.assignments.builder;
 
+import lombok.Data;
+import lombok.Getter;
+import lombok.With;
+
+@WithBuilder
 public class DatabaseConfiguration {
 
     private String databaseUrl;
@@ -41,4 +46,53 @@ public boolean isEnableCache() {
     public boolean isReadOnly() {
         return isReadOnly;
     }
+
+    public static DatabaseConfigurationBuilder builder(){
+        return new DatabaseConfigurationBuilder();
+    }
+
+    public static class DatabaseConfigurationBuilder{
+        private String databaseUrl;
+        private String username;
+        private String password;
+        private int maxConnections;
+        private boolean enableCache;
+        private boolean isReadOnly;
+
+        public DatabaseConfigurationBuilder setDatabaseUrl(String databaseUrl) {
+            this.databaseUrl = databaseUrl;
+            return this;
+        }
+
+        public DatabaseConfigurationBuilder setUsername(String username) {
+            this.username = username;
+            return this;
+        }
+
+        public DatabaseConfigurationBuilder setPassword(String password) {
+            this.password = password;
+            return this;
+        }
+
+        public DatabaseConfigurationBuilder setMaxConnections(int maxConnections) {
+            this.maxConnections = maxConnections;
+            return this;
+        }
+
+        public DatabaseConfigurationBuilder setEnableCache(boolean enableCache) {
+            this.enableCache = enableCache;
+            return this;
+        }
+
+        public DatabaseConfigurationBuilder setReadOnly(boolean readOnly) {
+            isReadOnly = readOnly;
+            return this;
+        }
+
+        public DatabaseConfiguration build(){
+            DatabaseConfiguration config = new DatabaseConfiguration(databaseUrl, username, password, maxConnections, enableCache, isReadOnly);
+//            databaseUrl = null; username = null; password=null; maxConnections=0; enableCache = false; isReadOnly = false;
+            return config;
+        }
+    }
 }

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

@@ -1,6 +1,6 @@
 package com.scaler.lld.design.assignments.builder;
 
-@WithBuilder
+//@WithBuilder
 public class DatabaseConfigurationBuilder {
 
 }

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;
@@ -46,4 +46,18 @@ public String getFontFamily() {
     public ConfigurationType getType() {
         return type;
     }
+
+    private Configuration(){};
+    @Override
+    public Configuration cloneObject() {
+        Configuration config = new Configuration();
+        config.themeColor = this.themeColor;
+        config.autoSave = this.autoSave;
+        config.language = this.language;
+        config.darkMode = this.darkMode;
+        config.fontSize = this.fontSize;
+        config.fontFamily = this.fontFamily;
+        config.type = this.type;
+        return config;
+    }
 }

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

@@ -0,0 +1,23 @@
+package com.scaler.lld.design.assignments.prototype;
+
+import java.util.HashMap;
+
+public class ConfigurationPrototypeRegistryImpl implements ConfigurationPrototypeRegistry{
+    private HashMap<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 config = registry.get(type);
+        if(config == null) return null;
+        return config.cloneObject();
+    }
+}

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

@@ -5,46 +5,64 @@ public class FileBasedConfigurationManagerImpl extends FileBasedConfigurationMan
     @Override
     public String getConfiguration(String key) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        return properties.getProperty(key);
+//        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
     }
 
     @Override
     public <T> T getConfiguration(String key, Class<T> type) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        String value = getConfiguration(key);
+        if(value == null) return null;
+        return convert(value, type);
+//        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
     }
 
     @Override
     public void setConfiguration(String key, String value) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+        properties.setProperty(key, value);
+//        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
     }
 
     @Override
     public <T> void setConfiguration(String key, T value) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+        properties.setProperty(key, String.valueOf(value));
+//        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
     }
 
     @Override
     public void removeConfiguration(String key) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'removeConfiguration'");
+        properties.remove(key);
+//        throw new UnsupportedOperationException("Unimplemented method 'removeConfiguration'");
     }
 
     @Override
     public void clear() {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'clear'");
+        properties.clear();
+//        throw new UnsupportedOperationException("Unimplemented method 'clear'");
     }
 
+    private static FileBasedConfigurationManager _thisRef;
+    private FileBasedConfigurationManagerImpl(){}
     public static FileBasedConfigurationManager getInstance() {
         // TODO Auto-generated method stub
-        return null;
+        if(_thisRef == null){
+            synchronized (FileBasedConfigurationManagerImpl.class){
+                if(_thisRef == null){
+                    _thisRef = new FileBasedConfigurationManagerImpl();
+                }
+            }
+        }
+        return _thisRef;
     }
 
     public static void resetInstance() {
         // TODO Auto-generated method stub
+        _thisRef = null;
     }
 
 }