Added Configurator class

src/zutil/db/bean/Configurator.java

@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2015 ezivkoc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package zutil.db.bean;
+
+import zutil.log.LogUtil;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Created by Ziver
+ */
+public class Configurator {
+    private static final Logger log = LogUtil.getLogger();
+
+
+    /**
+     * Sets a field in a class as externally configurable.
+     */
+    @Retention(RetentionPolicy.RUNTIME) // Make this annotation accessible at runtime via reflection.
+    @Target({ElementType.FIELD})        // This annotation can only be applied to class fields.
+    public static @interface Configurable{
+        /* Nice name of this parameter */
+        String value();
+        /* Defines the order the parameters, in ascending order */
+        int order() default Integer.MAX_VALUE;
+    }
+
+
+    public static enum ConfigType{
+        STRING, INT, BOOLEAN
+    }
+
+
+    private Object obj;
+    private ConfigurationParam[] params;
+
+    public Configurator(Object obj){
+        this.obj = obj;
+        this.params = getConfiguration(obj.getClass());
+    }
+
+    public ConfigurationParam[] getConfiguration(){
+        return params;
+    }
+
+    protected ConfigurationParam[] getConfiguration(Class c){
+        ArrayList<ConfigurationParam> conf = new ArrayList<ConfigurationParam>();
+
+        Field[] all = c.getDeclaredFields();
+        for(Field f : all){
+            if(f.isAnnotationPresent(Configurable.class) &&
+                    !Modifier.isStatic(f.getModifiers()) && !Modifier.isTransient(f.getModifiers())) {
+                try {
+                    conf.add(new ConfigurationParam(f));
+                } catch (IllegalAccessException e) {
+                    log.log(Level.WARNING, null, e);
+                }
+            }
+        }
+
+        ConfigurationParam[] list = conf.toArray(new ConfigurationParam[conf.size()]);
+        Arrays.sort(list);
+        return list;
+    }
+
+    public void setConfiguration(){
+        for(ConfigurationParam param : params){
+            try {
+                param.set();
+            } catch (IllegalAccessException e) {
+                log.log(Level.WARNING, null, e);
+            }
+        }
+    }
+
+
+    public class ConfigurationParam implements Comparable<ConfigurationParam>{
+        protected Field field;
+        protected String name;
+        protected String niceName;
+        protected ConfigType type;
+        protected Object value;
+        protected int order;
+
+
+        protected ConfigurationParam(Field f) throws IllegalAccessException {
+            field = f;
+            field.setAccessible(true);
+            name =     field.getName();
+            niceName = field.getAnnotation(Configurable.class).value();
+            order =    field.getAnnotation(Configurable.class).order();
+            value =    field.get(obj);
+
+            if     (f.getType() == String.class) type = ConfigType.STRING;
+            else if(f.getType() == int.class)    type = ConfigType.INT;
+            else if(f.getType() == boolean.class)type = ConfigType.BOOLEAN;
+
+        }
+
+        public String getName(){       return name;}
+        public String getNiceName(){   return niceName;}
+        public ConfigType getType(){   return type;}
+        public boolean isTypeString(){ return type == ConfigType.STRING;}
+        public boolean isTypeInt(){    return type == ConfigType.INT;}
+        public boolean isTypeBoolean(){return type == ConfigType.BOOLEAN;}
+
+        public String getString(){
+            if(value == null)
+                return null;
+            return value.toString();}
+
+        public void setValue(String v){
+            switch(type){
+                case STRING:
+                    value = v; break;
+                case INT:
+                    value = Integer.parseInt(v); break;
+                case BOOLEAN:
+                    value = Boolean.parseBoolean(v); break;
+            }
+        }
+
+        protected void set() throws IllegalAccessException {
+            field.set(obj, value);
+        }
+
+
+        @Override
+        public int compareTo(ConfigurationParam configurationParam) {
+            return this.order - configurationParam.order;
+        }
+    }
+}