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    1   /*
    2    * $Id: MetaFieldProperty.java 4287 2006-12-01 13:00:13Z blackdrag $
    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  import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
    39
    40  import java.lang.reflect.Field;
    41  import java.lang.reflect.Modifier;
    42  import java.security.AccessController;
    43  import java.security.PrivilegedActionException;
    44  import java.security.PrivilegedExceptionAction;
    45
    46  /***
    47   * Represents a property on a bean which may have a getter and/or a setter
    48   *
    49   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
    50   * @version $Revision: 4287 $
    51   */
    52  public class MetaFieldProperty extends MetaProperty {
    53
    54      private Field field;
    55
    56      public MetaFieldProperty(Field field) {
    57          super(field.getName(), field.getType());
    58          this.field = field;
    59      }
    60
    61      /***
    62       * @return the property of the given object
    63       * @throws Exception if the property could not be evaluated
    64       */
    65      public Object getProperty(final Object object) {
    66          try {
    67              Object value = (Object) AccessController.doPrivileged(new PrivilegedExceptionAction() {
    68                  public Object run() throws IllegalAccessException {
    69                      field.setAccessible(true);
    70                      return field.get(object);
    71                  }
    72              });
    73              return value;
    74          } catch (PrivilegedActionException pe) {
    75              throw new GroovyRuntimeException("Cannot get the property '" + name + "'.", pe.getException());
    76          }
    77      }
    78
    79      /***
    80       * Sets the property on the given object to the new value
    81       *
    82       * @param object on which to set the property
    83       * @param newValue the new value of the property
    84       * @throws RuntimeException if the property could not be set
    85       */
    86      public void setProperty(final Object object, Object newValue) {
    87          final Object goalValue = DefaultTypeTransformation.castToType(newValue, field.getType());
    88          try {
    89              AccessController.doPrivileged(new PrivilegedExceptionAction() {
    90                  public Object run() throws IllegalAccessException, GroovyRuntimeException {
    91                      field.setAccessible(true);
    92                      field.set(object, goalValue);
    93                      return null;
    94                  }
    95              });
    96          } catch (PrivilegedActionException ex) {
    97              throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", ex.getException());
    98          }
    99      }
    100
    101     private String toName(Class c) {
    102         String s = c.toString();
    103         if (s.startsWith("class ") && s.length() > 6)
    104             return s.substring(6);
    105         else
    106             return s;
    107     }
    108
    109     public int getModifiers() {
    110         return field.getModifiers();
    111     }
    112
    113     public boolean isStatic() {
    114         return Modifier.isStatic(field.getModifiers());
    115     }
    116 }