| /* |
| * 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.cassandra.config; |
| |
| import java.beans.IntrospectionException; |
| import java.beans.Introspector; |
| import java.beans.PropertyDescriptor; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import com.fasterxml.jackson.annotation.JsonIgnore; |
| import org.yaml.snakeyaml.error.YAMLException; |
| import org.yaml.snakeyaml.introspector.FieldProperty; |
| import org.yaml.snakeyaml.introspector.MethodProperty; |
| import org.yaml.snakeyaml.introspector.Property; |
| |
| import static org.apache.cassandra.utils.FBUtilities.camelToSnake; |
| |
| public class DefaultLoader implements Loader |
| { |
| @Override |
| public Map<String, Property> getProperties(Class<?> root) |
| { |
| Map<String, Property> properties = new HashMap<>(); |
| for (Class<?> c = root; c != null; c = c.getSuperclass()) |
| { |
| for (Field f : c.getDeclaredFields()) |
| { |
| String name = camelToSnake(f.getName()); |
| int modifiers = f.getModifiers(); |
| if (!Modifier.isStatic(modifiers) |
| && !f.isAnnotationPresent(JsonIgnore.class) |
| && !Modifier.isTransient(modifiers) |
| && Modifier.isPublic(modifiers) |
| && !properties.containsKey(name)) |
| properties.put(name, new FieldProperty(f)); |
| } |
| } |
| try |
| { |
| PropertyDescriptor[] descriptors = Introspector.getBeanInfo(root).getPropertyDescriptors(); |
| if (descriptors != null) |
| { |
| for (PropertyDescriptor d : descriptors) |
| { |
| String name = camelToSnake(d.getName()); |
| Method writeMethod = d.getWriteMethod(); |
| // if the property can't be written to, then ignore it |
| if (writeMethod == null || writeMethod.isAnnotationPresent(JsonIgnore.class)) |
| continue; |
| // if read method exists, override the field version in case get/set does validation |
| if (properties.containsKey(name) && (d.getReadMethod() == null || d.getReadMethod().isAnnotationPresent(JsonIgnore.class))) |
| continue; |
| d.setName(name); |
| properties.put(name, new MethodPropertyPlus(d)); |
| } |
| } |
| } |
| catch (IntrospectionException e) |
| { |
| throw new RuntimeException(e); |
| } |
| return properties; |
| } |
| |
| /** |
| * .get() acts differently than .set() and doesn't do a good job showing the cause of the failure, this |
| * class rewrites to make the errors easier to reason with. |
| */ |
| private static class MethodPropertyPlus extends MethodProperty |
| { |
| private final Method readMethod; |
| |
| public MethodPropertyPlus(PropertyDescriptor property) |
| { |
| super(property); |
| this.readMethod = property.getReadMethod(); |
| } |
| |
| @Override |
| public Object get(Object object) |
| { |
| if (!isReadable()) |
| throw new YAMLException("No readable property '" + getName() + "' on class: " + object.getClass().getName()); |
| |
| try |
| { |
| return readMethod.invoke(object); |
| } |
| catch (IllegalAccessException e) |
| { |
| throw new YAMLException("Unable to find getter for property '" + getName() + "' on class " + object.getClass().getName(), e); |
| } |
| catch (InvocationTargetException e) |
| { |
| throw new YAMLException("Failed calling getter for property '" + getName() + "' on class " + object.getClass().getName(), e.getCause()); |
| } |
| } |
| } |
| } |