001    /*
002     * $Id: MetaFieldProperty.java,v 1.4 2005/08/25 22:08:35 phk Exp $
003     *
004     * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005     *
006     * Redistribution and use of this software and associated documentation
007     * ("Software"), with or without modification, are permitted provided that the
008     * following conditions are met:
009     *  1. Redistributions of source code must retain copyright statements and
010     * notices. Redistributions must also contain a copy of this document.
011     *  2. Redistributions in binary form must reproduce the above copyright
012     * notice, this list of conditions and the following disclaimer in the
013     * documentation and/or other materials provided with the distribution.
014     *  3. The name "groovy" must not be used to endorse or promote products
015     * derived from this Software without prior written permission of The Codehaus.
016     * For written permission, please contact info@codehaus.org.
017     *  4. Products derived from this Software may not be called "groovy" nor may
018     * "groovy" appear in their names without prior written permission of The
019     * Codehaus. "groovy" is a registered trademark of The Codehaus.
020     *  5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/
021     *
022     * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
023     * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
024     * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
025     * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
026     * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
027     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
028     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
029     * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
030     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
031     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
032     * DAMAGE.
033     *
034     */
035     
036    package groovy.lang;
037    
038    
039    import org.codehaus.groovy.runtime.InvokerHelper;
040    import java.lang.reflect.Field;
041    import java.security.AccessController;
042    import java.security.PrivilegedExceptionAction;
043    
044    /**
045     * Represents a property on a bean which may have a getter and/or a setter
046     * 
047     * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
048     * @version $Revision: 1.4 $
049     */
050    public class MetaFieldProperty extends MetaProperty {
051    
052        private Field field;
053    
054        public MetaFieldProperty(Field field) {
055            super(field.getName(), field.getType());
056            this.field = field;
057        }
058    
059        /**
060         * @return the property of the given object
061         * @throws Exception if the property could not be evaluated
062         */
063        public Object getProperty(Object object) throws Exception {
064            final Field field1 = field;
065            final Object object1 = object;
066            Object value = (Object) AccessController.doPrivileged(new PrivilegedExceptionAction() {
067                 public Object run() throws IllegalAccessException {   
068                     field1.setAccessible(true);
069                     return field1.get(object1);
070                 }
071            });
072            return value;
073        }
074    
075        /**
076         * Sets the property on the given object to the new value
077         * 
078         * @param object on which to set the property
079         * @param newValue the new value of the property
080         * @throws Exception if the property could not be set
081         */
082        public void setProperty(Object object, Object newValue) {
083            final Field field1 = field;
084            final Object object1 = object;
085            final Object newValue1 = newValue;
086            try {
087                AccessController.doPrivileged(new PrivilegedExceptionAction() {
088                    public Object run() throws IllegalAccessException, TypeMismatchException, GroovyRuntimeException {   
089                        try {
090                            field1.set(object1, newValue1);
091                            return newValue1;
092                        }
093                        catch (IllegalArgumentException e) {
094                            try {
095                                Object newValue2 = InvokerHelper.asType(newValue1, field1.getType());
096                                field1.set(object1, newValue2);
097                                return newValue2;
098                            }
099                            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    }