com.feilong.formatter.builder.BeanTypeFormatterColumnEntityBuilder Maven / Gradle / Ivy
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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
/*
* Copyright (C) 2008 feilong
*
* 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.feilong.formatter.builder;
import static com.feilong.core.Validator.isNotNullOrEmpty;
import java.lang.reflect.Field;
import com.feilong.formatter.FormatterColumn;
import com.feilong.formatter.entity.FormatterColumnEntity;
/**
* java Bean类型格式化列的创造器.
*
* @author feilong
* @since 1.10.6
*/
class BeanTypeFormatterColumnEntityBuilder{
/** Don't let anyone instantiate this class. */
private BeanTypeFormatterColumnEntityBuilder(){
//AssertionError不是必须的. 但它可以避免不小心在类的内部调用构造器. 保证该类在任何情况下都不会被实例化.
//see 《Effective Java》 2nd
throw new AssertionError("No " + getClass().getName() + " instances for you!");
}
//---------------------------------------------------------------
/**
* Builds the formatter column entity.
*
* @param field
* the field
* @return the formatter column entity
*/
static FormatterColumnEntity buildFormatterColumnEntity(Field field){
FormatterColumn formatterColumn = field.getAnnotation(FormatterColumn.class);
return new FormatterColumnEntity(getName(field, formatterColumn), field.getName(), getOrder(formatterColumn));
}
//---------------------------------------------------------------
/**
* 获得 order.
*
* @param formatterColumn
* the formatter column
* @return the order
*/
private static int getOrder(FormatterColumn formatterColumn){
return null != formatterColumn ? formatterColumn.order() : Integer.MAX_VALUE;//设值的排在前面
}
/**
* 获得 name.
*
* @param field
* the field
* @param formatterColumn
* the formatter column
* @return the name
*/
private static String getName(Field field,FormatterColumn formatterColumn){
if (null != formatterColumn && isNotNullOrEmpty(formatterColumn.name())){
return formatterColumn.name().trim();
}
return field.getName();
}
}