/*
* $Id: StrutsConversionErrorInterceptor.java 451544 2006-09-30 05:38:02Z mrdon $
*
* Copyright 2006 The Apache Software Foundation.
*
* 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 org.apache.struts2.interceptor;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor;
import com.opensymphony.xwork2.util.ValueStack;
/**
* <!-- START SNIPPET: description -->
*
* This interceptor extends {@link ConversionErrorInterceptor} but only adds conversion errors from the ActionContext to
* the field errors of the action if the field value is not null, "", or {""} (a size 1 String array with only an empty
* String). See {@link ConversionErrorInterceptor} for more information, as well as the Type Conversion documentation.
*
* <!-- END SNIPPET: description -->
*
* <p/> <u>Interceptor parameters:</u>
*
* <!-- START SNIPPET: parameters -->
*
* <ul>
*
* <li>None</li>
*
* </ul>
*
* <!-- END SNIPPET: parameters -->
*
* <p/> <u>Extending the interceptor:</u>
*
* <p/>
*
* <!-- START SNIPPET: extending -->
*
* There are no known extension points for this interceptor.
*
* <!-- END SNIPPET: extending -->
*
* <pre>
* <!-- START SNIPPET: example -->
* <action name="someAction" class="com.examples.SomeAction">
* <interceptor-ref name="params"/>
* <interceptor-ref name="conversionError"/>
* <result name="success">good_result.ftl</result>
* </action>
* <!-- END SNIPPET: example -->
* </pre>
*
* @see com.opensymphony.xwork2.ActionContext#getConversionErrors()
* @see ConversionErrorInterceptor
*/
public class StrutsConversionErrorInterceptor extends ConversionErrorInterceptor {
private static final long serialVersionUID = 2759744840082921602L;
protected Object getOverrideExpr(ActionInvocation invocation, Object value) {
ValueStack stack = invocation.getStack();
try {
stack.push(value);
return "'" + stack.findValue("top", String.class) + "'";
} finally {
stack.pop();
}
}
/**
* Returns <tt>false</tt> if the value is null, "", or {""} (array of size 1 with a blank element). Returns
* <tt>true</tt> otherwise.
*
* @param propertyName the name of the property to check.
* @param value the value to error check.
* @return <tt>false</tt> if the value is null, "", or {""}, <tt>true</tt> otherwise.
*/
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;
}
}