private FieldConfig parseFieldConfig(Node fieldNode) throws ConfigException {
NamedNodeMap attr = fieldNode.getAttributes();
Node nameNode = attr.getNamedItem(XMLConfigConstant.NAME);
if (nameNode == null) {
throw new ConfigException(ErrorMsg.NO_NAME_PROPERTY_FOR_FIELD);
}
FieldConfig fieldConfig = new FieldConfig(nameNode.getNodeValue());
NodeList validateRule = fieldNode.getChildNodes();
if (validateRule == null || validateRule.getLength() == 0) {
return null;
}
for (int i = 0; i < validateRule.getLength(); i++) {
Node node = validateRule.item(i);
if (node.getNodeType() != Node.ELEMENT_NODE) {
continue;
}
AbstractValidator validator =
ValidatorRegistry.getInstance().getValidator(node.getNodeName());
if (validator == null) {
throw new ConfigException(ErrorMsg.NO_SUCH_VALIDATOR_ERROR + node.getNodeName());
} else {
fieldConfig.addRule(validator.parseRuleConfig(node));
}
}
return fieldConfig;
}
/**
* 将XML配置中节点解析出来返回一个validator的list
*
* @param doc
* @return
* @throws ConfigException
* @throws InstantiationException
* @throws IllegalAccessException
* @throws ClassNotFoundException
*/
private List<AbstractValidator> parseValidators(Document doc)
throws ConfigException, InstantiationException, IllegalAccessException,
ClassNotFoundException {
NodeList children = doc.getDocumentElement().getChildNodes();
List<AbstractValidator> validators = new ArrayList<AbstractValidator>();
for (int i = 0; i < children.getLength(); i++) {
Node node = children.item(i);
if (XMLConfigConstant.VALIDATOR.equals(node.getNodeName())) {
NamedNodeMap attrMap = node.getAttributes();
Node classNameAttr = attrMap.getNamedItem(XMLConfigConstant.CLASS_NAME);
if (classNameAttr == null) {
throw new ConfigException(ErrorMsg.VALIDATOR_CLASS_NAME_EMPTY);
}
String className = classNameAttr.getNodeValue();
Object obj = Class.forName(className).newInstance();
if (!(obj instanceof AbstractValidator)) {
throw new ConfigException(ErrorMsg.VALIDATOR_BASE_CLASS_ERROR);
}
AbstractValidator validator = (AbstractValidator) obj;
if (validator != null) {
validators.add(validator);
// 如果XML中指定了name属性，则重置name
Node nameAttr = attrMap.getNamedItem(XMLConfigConstant.NAME);
if (nameAttr != null) {
validator.setName(nameAttr.getNodeValue());
}
// 如果有property子元素，则赋值给validator
NodeList properties = node.getChildNodes();
for (int j = 0; j < properties.getLength(); j++) {
Node propNode = properties.item(j);
if (XMLConfigConstant.PROPERTY.equals(propNode.getNodeName())) {
NamedNodeMap propAttr = propNode.getAttributes();
Node propName = propAttr.getNamedItem(XMLConfigConstant.NAME);
if (propName != null) {
String methodName = propName.getNodeValue();
methodName = methodName.substring(0, 1).toUpperCase() + methodName.substring(1);
BeanUtil.invoke(
validator, "set" + methodName, String.class, propNode.getTextContent());
}
}
}
}
}
}
return validators;
}