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    1   /*
    2    * $Id: MetaFieldProperty.java,v 1.4 2005/08/25 22:08:35 phk Exp $
    3    *
    4    * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
    5    *
    6    * Redistribution and use of this software and associated documentation
    7    * ("Software"), with or without modification, are permitted provided that the
    8    * following conditions are met:
    9    *  1. Redistributions of source code must retain copyright statements and
    10   * notices. Redistributions must also contain a copy of this document.
    11   *  2. Redistributions in binary form must reproduce the above copyright
    12   * notice, this list of conditions and the following disclaimer in the
    13   * documentation and/or other materials provided with the distribution.
    14   *  3. The name "groovy" must not be used to endorse or promote products
    15   * derived from this Software without prior written permission of The Codehaus.
    16   * For written permission, please contact info@codehaus.org.
    17   *  4. Products derived from this Software may not be called "groovy" nor may
    18   * "groovy" appear in their names without prior written permission of The
    19   * Codehaus. "groovy" is a registered trademark of The Codehaus.
    20   *  5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/
    21   *
    22   * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
    23   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    24   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    25   * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
    26   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    27   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    28   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    29   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    30   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    31   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
    32   * DAMAGE.
    33   *
    34   */
    35
    36  package groovy.lang;
    37
    38
    39  import org.codehaus.groovy.runtime.InvokerHelper;
    40  import java.lang.reflect.Field;
    41  import java.security.AccessController;
    42  import java.security.PrivilegedExceptionAction;
    43
    44  /***
    45   * Represents a property on a bean which may have a getter and/or a setter
    46   *
    47   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
    48   * @version $Revision: 1.4 $
    49   */
    50  public class MetaFieldProperty extends MetaProperty {
    51
    52      private Field field;
    53
    54      public MetaFieldProperty(Field field) {
    55          super(field.getName(), field.getType());
    56          this.field = field;
    57      }
    58
    59      /***
    60       * @return the property of the given object
    61       * @throws Exception if the property could not be evaluated
    62       */
    63      public Object getProperty(Object object) throws Exception {
    64          final Field field1 = field;
    65          final Object object1 = object;
    66          Object value = (Object) AccessController.doPrivileged(new PrivilegedExceptionAction() {
    67               public Object run() throws IllegalAccessException {
    68                   field1.setAccessible(true);
    69                   return field1.get(object1);
    70               }
    71          });
    72          return value;
    73      }
    74
    75      /***
    76       * Sets the property on the given object to the new value
    77       *
    78       * @param object on which to set the property
    79       * @param newValue the new value of the property
    80       * @throws Exception if the property could not be set
    81       */
    82      public void setProperty(Object object, Object newValue) {
    83          final Field field1 = field;
    84          final Object object1 = object;
    85          final Object newValue1 = newValue;
    86          try {
    87              AccessController.doPrivileged(new PrivilegedExceptionAction() {
    88                  public Object run() throws IllegalAccessException, TypeMismatchException, GroovyRuntimeException {
    89                      try {
    90                          field1.set(object1, newValue1);
    91                          return newValue1;
    92                      }
    93                      catch (IllegalArgumentException e) {
    94                          try {
    95                              Object newValue2 = InvokerHelper.asType(newValue1, field1.getType());
    96                              field1.set(object1, newValue2);
    97                              return newValue2;
    98                          }
    99                          catch (Exception ex) {
    100                             throw new TypeMismatchException( "'" + toName(object1.getClass()) + "." + field1.getName()
    101                                                                  + "' can not refer to the value '"
    102                                                                  + newValue1 + "' (type " + toName(newValue1.getClass())
    103                                                                  + "), because it is of the type " + toName(field1.getType()) );
    104                         }
    105                     }
    106                     catch (Exception ex) {
    107                         throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", ex);
    108                     }
    109                 }
    110             });
    111         }
    112         catch (TypeMismatchException ex) {
    113             throw ex;
    114         }
    115         catch (Exception ex) {
    116             throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", ex);
    117         }
    118     }
    119
    120     private String toName(Class c) {
    121         String s = c.toString();
    122         if (s.startsWith("class ") && s.length() > 6)
    123             return s.substring(6);
    124         else
    125             return s;
    126     }
    127 }