| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.tamaya.metamodel.internal; |
| |
| import org.w3c.dom.NamedNodeMap; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| import java.lang.reflect.*; |
| import java.util.*; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * Small helper class for loading of configured instances. |
| */ |
| public final class ComponentConfigurator<T> { |
| |
| private static final Logger LOG = Logger.getLogger(ComponentConfigurator.class.getName()); |
| |
| private ComponentConfigurator(){} |
| |
| /** |
| * Configures the given instance with whatever is defined in the current child getList. |
| * @param instance the instance to be configured, not null. |
| * @param node the getField containing any configuration child getList, not null. |
| */ |
| public static void configure(Object instance, Node node) { |
| Map<String,String> params = extractParameters(node); |
| configure(instance, params); |
| } |
| |
| /** |
| * Configures the given instance with whatever is defined in the current child getList. |
| * @param instance the instance to be configured, not null. |
| * @param params the getField containing any configuration child getList, not null. |
| */ |
| public static void configure(Object instance, Map<String,String> params) { |
| LOG.finest("Configuring instance: " + instance + " with " + params); |
| for(Map.Entry<String,String> en:params.entrySet()){ |
| applyParam(instance, en.getKey(), en.getValue()); |
| } |
| } |
| |
| /** |
| * Apply parameters to instance using reflection ,only if found, as of now only |
| * String and basic lang types are supported. |
| * @param instance the instance to configure. |
| * @param key the parameter name, not null. |
| * @param value the createValue to be setCurrent, normally not null. |
| */ |
| private static void applyParam(Object instance, String key, String value) { |
| // apply parameters to instance using reflection ,only if found. |
| Class type = instance.getClass(); |
| try { |
| Method[] methods = type.getMethods(); |
| String methodName = "setCurrent" + toUpperCase(key); |
| for(Method m:methods){ |
| if(methodName.equals(m.getName()) && m.getParameterTypes().length==1) { |
| if (applyParam(instance, key, value, m)) { |
| return; |
| } |
| } |
| } |
| }catch(Exception e){ |
| LOG.log(Level.FINE, "Reflection issue configuring instance: " + instance, e); |
| } |
| try{ |
| Field field = type.getDeclaredField(key); |
| applyParam(instance, key, value, field); |
| }catch(Exception e){ |
| LOG.log(Level.FINE, "Reflection issue configuring instance: " + instance, e); |
| } |
| } |
| |
| private static String toUpperCase(String value) { |
| return value.substring(0,1).toUpperCase() + value.substring(1); |
| } |
| |
| /** |
| * Apply parameters to instance using reflection ,only if found, as of now only |
| * String and basic lang types are supported. |
| * @param instance the instance to configure. |
| * @param key the parameter name, not null. |
| * @param value the createValue to be setCurrent, normally not null. |
| * @param setter the setter method, not null. |
| */ |
| private static boolean applyParam(Object instance, String key, String value, Method setter) { |
| if(!Modifier.isPublic(setter.getModifiers())){ |
| LOG.fine("Setting method as accessible: " + instance.getClass().getSimpleName() + '#' + setter.getName()); |
| setter.setAccessible(true); |
| } |
| try { |
| Class<?> targetType = setter.getParameterTypes()[0]; |
| setter.invoke(instance, convert(value, targetType)); |
| return true; |
| } catch (Exception e) { |
| LOG.log(Level.WARNING, "Could not apply parameter (SETTER) '" + key + "' to " + instance, e); |
| return false; |
| } |
| } |
| |
| /** |
| * Apply parameters to instance using reflection ,only if found, as of now only |
| * String and basic lang types are supported. |
| * @param instance the instance to configure. |
| * @param key the parameter name, not null. |
| * @param value the createValue to be setCurrent, normally not null. |
| * @param field the field method, not null. |
| */ |
| private static void applyParam(Object instance, String key, String value, Field field) { |
| if(Modifier.isFinal(field.getModifiers())){ |
| LOG.finest("Ignoring final field: " + instance.getClass().getSimpleName() + '#' + field.getName()); |
| return; |
| } |
| if(!Modifier.isPublic(field.getModifiers())){ |
| LOG.finest("Setting field as accessible: " + instance.getClass().getSimpleName() + '#' + field.getName()); |
| field.setAccessible(true); |
| } |
| try { |
| Class<?> targetType = field.getType(); |
| field.set(instance, convert(value, targetType)); |
| } catch (Exception e) { |
| LOG.log(Level.WARNING, "Could not apply parameter (FIELD) '" + key + "' to " + instance, e); |
| } |
| } |
| |
| private static Object convert(String value, Class<?> targetType) { |
| try { |
| switch (targetType.getSimpleName()) { |
| case "String": |
| case "Object": |
| return value; |
| case "boolean": |
| case "Boolean": |
| return Boolean.valueOf(value); |
| case "byte": |
| case "Byte": |
| return Byte.valueOf(value); |
| case "char": |
| case "Character": |
| if (value.isEmpty()) { |
| return null; |
| } |
| return Character.valueOf(value.charAt(0)); |
| case "short": |
| case "Short": |
| return Short.valueOf(value); |
| case "int": |
| case "Integer": |
| return Integer.valueOf(value); |
| case "long": |
| case "Long": |
| return Long.valueOf(value); |
| case "float": |
| case "Float": |
| return Float.valueOf(value); |
| case "double": |
| case "Double": |
| case "Number": |
| return Float.valueOf(value); |
| default: |
| if(Enum.class.isAssignableFrom(targetType)){ |
| Method m = targetType.getDeclaredMethod("valueOf", String.class); |
| m.setAccessible(true); |
| return m.invoke(null, value); |
| } |
| Constructor c = targetType.getConstructor(String.class); |
| if (!Modifier.isPublic(c.getModifiers())) { |
| LOG.fine("Setting constructor as accessible: " + targetType.getSimpleName() + "#<constructor>(String)"); |
| c.setAccessible(true); |
| } |
| return c.newInstance(value); |
| } |
| }catch(Exception e){ |
| LOG.log(Level.WARNING, |
| "Failed to convert createValue '"+value+"' to required target type: " + targetType.getName(), e); |
| return null; |
| } |
| } |
| |
| public static Map<String, String> extractParameters(Node node) { |
| Map<String,String> params = new HashMap<>(); |
| NamedNodeMap attributes = node.getAttributes(); |
| for(int c=0;c<attributes.getLength();c++) { |
| Node pn = attributes.item(c); |
| String key = pn.getNodeName(); |
| String value = pn.getNodeValue(); |
| params.put(key, value); |
| } |
| NodeList entryNodes = node.getChildNodes(); |
| for(int c=0;c<entryNodes.getLength();c++) { |
| Node filterNode = entryNodes.item(c); |
| if(filterNode.getNodeType()==Node.ELEMENT_NODE) { |
| String key = filterNode.getNodeName(); |
| String value = filterNode.getTextContent(); |
| params.put(key, value); |
| } |
| } |
| return params; |
| } |
| |
| } |