package ${package}.webapp.interceptor;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ValidationAware;
import com.opensymphony.xwork2.XWorkMessages;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import com.opensymphony.xwork2.interceptor.PreResultListener;
import com.opensymphony.xwork2.util.LocalizedTextUtil;
import com.opensymphony.xwork2.util.ValueStack;
public class ConversionErrorInterceptor extends AbstractInterceptor {
private static final long serialVersionUID = 3523920371186971937L;
public static final String ORIGINAL_PROPERTY_OVERRIDE = "original.property.override";
protected Object getOverrideExpr(ActionInvocation invocation, Object value) {
ValueStack stack = invocation.getStack();
try {
stack.push(value);
return "'" + stack.findValue("top", String.class) + "'";
} finally {
stack.pop();
}
}
@SuppressWarnings("unchecked")
public String intercept(ActionInvocation invocation) throws Exception {
ActionContext invocationContext = invocation.getInvocationContext();
Map conversionErrors = invocationContext.getConversionErrors();
ValueStack stack = invocationContext.getValueStack();
HashMap fakie = null;
for (Iterator iterator = conversionErrors.entrySet().iterator(); iterator
.hasNext();) {
Map.Entry entry = (Map.Entry) iterator.next();
String propertyName = (String) entry.getKey();
Object value = entry.getValue();
if (shouldAddError(propertyName, value)) {
Object action = invocation.getAction();
if (action instanceof ValidationAware) {
ValidationAware va = (ValidationAware) action;
va.addFieldError(propertyName, getErrorMessage(
propertyName, stack));
}
if (fakie == null) {
fakie = new HashMap();
}
fakie.put(propertyName, getOverrideExpr(invocation, value));
}
}
if (fakie != null) {
// if there were some errors, put the original (fake) values in
// place right before the result
stack.getContext().put(ORIGINAL_PROPERTY_OVERRIDE, fakie);
invocation.addPreResultListener(new PreResultListener() {
public void beforeResult(ActionInvocation invocation,
String resultCode) {
Map fakie = (Map) invocation.getInvocationContext().get(
ORIGINAL_PROPERTY_OVERRIDE);
if (fakie != null) {
invocation.getStack().setExprOverrides(fakie);
}
}
});
}
return invocation.invoke();
}
@SuppressWarnings("unchecked")
private String getErrorMessage(String propertyName, ValueStack stack) {
String defaultMessage = LocalizedTextUtil.findDefaultText(
XWorkMessages.DEFAULT_INVALID_FIELDVALUE, ActionContext
.getContext().getLocale(),
new Object[] { propertyName });
// 将形如 model.name 的属性转换成形如 fields.user.name，以便从国际化语言文件中取本地化语言
if (propertyName.startsWith("model.")) {
String modelName = stack
.findString(BasicModelInterceptor.JPT_MODEL_NAME_IN_VALUE_STACK);
if (modelName != null && !modelName.equals("")) {
propertyName = "fields." + modelName
+ propertyName.substring(5);
}
}
Map context = new HashMap();
context.put("fieldName", propertyName);
try {
stack.push(context);
String message = stack
.findString("getText('errors.model.invalid')");
if (message != null) {
return message;
}
} finally {
stack.pop();
}
return defaultMessage;
}
protected boolean shouldAddError(String propertyName, Object value) {
if (value == null) {
return false;
}
if ("".equals(value)) {
return false;
}
if (value instanceof String[]) {
String[] array = (String[]) value;
if (array.length == 0) {
return false;
}
if (array.length > 1) {
return true;
}
String str = array[0];
if ("".equals(str)) {
return false;
}
}
return true;
}
}