content: /*
   * Copyright (C) 2018 the original author or authors.
   *
   * Licensed 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 com.alibaba.codeless.framework.autoconfigure;
  
  import com.alibaba.codeless.framework.core.utils.StringUtils;
  import org.springframework.util.Assert;
  
  import javax.persistence.Id;
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  
  /**
   * @author xiaolongzuo
   */
  public class CodelessEntityMetadata {
  
      private Class<?> entityClass;
  
      private Method getIdMethod;
  
      private Field idField;
  
      public CodelessEntityMetadata(Class<?> entityClass) {
          Assert.notNull(entityClass, "The entity class must not be null!");
          this.entityClass = entityClass;
          this.idField = findIdField(this.entityClass);
          this.getIdMethod = findGetIdMethod(this.entityClass, this.idField);
      }
  
      private Field findIdField(Class<?> clazz) {
          Field[] fields = clazz.getDeclaredFields();
          if (fields == null) {
              return null;
          }
          for (Field field : fields) {
              if (field.getDeclaredAnnotation(Id.class) != null) {
                  return field;
              }
          }
          return null;
      }
  
      private Method findGetIdMethod(Class<?> clazz, Field idField) {
          String fieldName = idField.getName();
          String getMethodName = fieldName.length() <= 1 ? "get" + fieldName.toUpperCase()
              : "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
          try {
              return clazz.getDeclaredMethod(getMethodName, new Class[0]);
          } catch (NoSuchMethodException e) {
              throw new RuntimeException(e);
          }
      }
  
      public Class<?> getEntityClass() {
          return entityClass;
      }
  
      public Method getGetIdMethod() {
          return getIdMethod;
      }
  
      public Field getIdField() {
          return idField;
      }
  
      public Object getIdValue(String stringValue) {
          return StringUtils.toPrimitives(idField.getType(), stringValue);
      }
  
  }
  