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    1   /*
    2    * $Id: StrutsConversionErrorInterceptor.java 471756 2006-11-06 15:01:43Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21  package org.apache.struts2.interceptor;
    22
    23  import com.opensymphony.xwork2.ActionInvocation;
    24  import com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor;
    25  import com.opensymphony.xwork2.util.ValueStack;
    26
    27
    28  /***
    29   * <!-- START SNIPPET: description -->
    30   *
    31   * This interceptor extends {@link ConversionErrorInterceptor} but only adds conversion errors from the ActionContext to
    32   * the field errors of the action if the field value is not null, "", or {""} (a size 1 String array with only an empty
    33   * String). See {@link ConversionErrorInterceptor} for more information, as well as the Type Conversion documentation.
    34   *
    35   * <!-- END SNIPPET: description -->
    36   *
    37   * <p/> <u>Interceptor parameters:</u>
    38   *
    39   * <!-- START SNIPPET: parameters -->
    40   *
    41   * <ul>
    42   *
    43   * <li>None</li>
    44   *
    45   * </ul>
    46   *
    47   * <!-- END SNIPPET: parameters -->
    48   *
    49   * <p/> <u>Extending the interceptor:</u>
    50   *
    51   * <p/>
    52   *
    53   * <!-- START SNIPPET: extending -->
    54   *
    55   * There are no known extension points for this interceptor.
    56   *
    57   * <!-- END SNIPPET: extending -->
    58   *
    59   * <pre>
    60   * <!-- START SNIPPET: example -->
    61   * &lt;action name="someAction" class="com.examples.SomeAction"&gt;
    62   *     &lt;interceptor-ref name="params"/&gt;
    63   *     &lt;interceptor-ref name="conversionError"/&gt;
    64   *     &lt;result name="success"&gt;good_result.ftl&lt;/result&gt;
    65   * &lt;/action&gt;
    66   * <!-- END SNIPPET: example -->
    67   * </pre>
    68   *
    69   * @see com.opensymphony.xwork2.ActionContext#getConversionErrors()
    70   * @see ConversionErrorInterceptor
    71   */
    72  public class StrutsConversionErrorInterceptor extends ConversionErrorInterceptor {
    73
    74      private static final long serialVersionUID = 2759744840082921602L;
    75
    76      protected Object getOverrideExpr(ActionInvocation invocation, Object value) {
    77          ValueStack stack = invocation.getStack();
    78
    79          try {
    80              stack.push(value);
    81
    82              return "'" + stack.findValue("top", String.class) + "'";
    83          } finally {
    84              stack.pop();
    85          }
    86      }
    87
    88      /***
    89       * Returns <tt>false</tt> if the value is null, "", or {""} (array of size 1 with a blank element). Returns
    90       * <tt>true</tt> otherwise.
    91       *
    92       * @param propertyName the name of the property to check.
    93       * @param value        the value to error check.
    94       * @return <tt>false</tt>  if the value is null, "", or {""}, <tt>true</tt> otherwise.
    95       */
    96      protected boolean shouldAddError(String propertyName, Object value) {
    97          if (value == null) {
    98              return false;
    99          }
    100
    101         if ("".equals(value)) {
    102             return false;
    103         }
    104
    105         if (value instanceof String[]) {
    106             String[] array = (String[]) value;
    107
    108             if (array.length == 0) {
    109                 return false;
    110             }
    111
    112             if (array.length > 1) {
    113                 return true;
    114             }
    115
    116             String str = array[0];
    117
    118             if ("".equals(str)) {
    119                 return false;
    120             }
    121         }
    122
    123         return true;
    124     }
    125 }