package com.alibaba.tamper.process;
import java.util.List;
import org.apache.commons.lang.ObjectUtils;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.tamper.core.BeanMappingException;
import com.alibaba.tamper.core.config.BeanMappingField;
import com.alibaba.tamper.core.helper.ReflectionHelper;
import com.alibaba.tamper.core.process.ValueProcess;
import com.alibaba.tamper.core.process.ValueProcessInvocation;
import com.alibaba.tamper.process.convertor.CollectionConvertor;
import com.alibaba.tamper.process.convertor.Convertor;
import com.alibaba.tamper.process.convertor.ConvertorHelper;
/**
* {@linkplain Convertor}转化的处理器,set流程处理
*
* @author jianghang 2011-5-27 下午09:30:40
*/
public class ConvertorValueProcess implements ValueProcess {
private final static Logger logger = LoggerFactory.getLogger(ConvertorValueProcess.class);
@Override
public Object process(Object value, ValueProcessInvocation invocation) throws BeanMappingException {
if (value != null && invocation.getContext().getCurrentField().isMapping() == false) {
BeanMappingField currentField = invocation.getContext().getCurrentField();
String customConvertorName = currentField.getConvertor();
Convertor convertor = currentField.getConvertorRef();// 取上一次实例化后的convertor对象
if (convertor == null && currentField.getConvertorClass() != null) {
// 进行自定义convertor初始化
Class clazz = currentField.getConvertorClass();
convertor = (Convertor) ReflectionHelper.newInstance(clazz);
currentField.setConvertorRef(convertor);
}
if (StringUtils.isNotEmpty(customConvertorName)) { // 判断是否有自定义的convertor
convertor = ConvertorHelper.getInstance().getConvertor(customConvertorName);
} else if (convertor == null) {
// srcClass针对直接使用script的情况，会出现为空，这时候需要依赖value.getClass进行转化
// 优先不选择使用value.getClass()的原因：原生类型会返回对应的Object类型，导出会出现不必要的convertor转化
Class srcClass = currentField.getSrcField().getClazz();
if (srcClass == null || srcClass.isPrimitive() == false) {
srcClass = value.getClass();
}
Class targetClass = currentField.getTargetField().getClazz();
if (targetClass != null) {
// targetClass可能存在为空，比如这里的Value配置了DefaultValue，在MapSetExecutor解析时会无法识别TargetClass
// 无法识别后，就不做转化
convertor = ConvertorHelper.getInstance().getConvertor(srcClass, targetClass);
if (convertor == null && !targetClass.isAssignableFrom(srcClass) && logger.isWarnEnabled()) {
// 记录下日志
StringBuilder builder = new StringBuilder();
builder.append("srcName[" + currentField.getSrcField().getName());
builder.append("],srcClass[" + ObjectUtils.toString(srcClass, "null"));
builder.append("],targetName[" + currentField.getTargetField().getName());
builder.append("],targetClass[" + ObjectUtils.toString(targetClass, "null") + "]");
logger.warn(builder.toString() + " convertor is null!");
}
}
}
if (convertor != null && currentField.getTargetField().getClazz() != null) {
List<Class> componentClasses = currentField.getTargetField().getComponentClasses();
Class[] array = null;
if (componentClasses != null && componentClasses.size() > 0) {
array = componentClasses.toArray(new Class[componentClasses.size()]);
}
if (array != null && convertor instanceof CollectionConvertor) {
// 进行嵌套对象处理
value = ((CollectionConvertor) convertor).convertCollection(
currentField,
value,
currentField.getTargetField().getClazz(),
array);
} else {
value = convertor.convert(value, currentField.getTargetField().getClazz());
}
}
}
// 继续下一步的调用
return invocation.proceed(value);
}
}