001    /*
002     * $Id: MetaFieldProperty.java 4287 2006-12-01 13:00:13Z blackdrag $
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    import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
039    
040    import java.lang.reflect.Field;
041    import java.lang.reflect.Modifier;
042    import java.security.AccessController;
043    import java.security.PrivilegedActionException;
044    import java.security.PrivilegedExceptionAction;
045    
046    /**
047     * Represents a property on a bean which may have a getter and/or a setter
048     * 
049     * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
050     * @version $Revision: 4287 $
051     */
052    public class MetaFieldProperty extends MetaProperty {
053    
054        private Field field;
055    
056        public MetaFieldProperty(Field field) {
057            super(field.getName(), field.getType());
058            this.field = field;
059        }
060    
061        /**
062         * @return the property of the given object
063         * @throws Exception if the property could not be evaluated
064         */
065        public Object getProperty(final Object object) {
066            try {
067                Object value = (Object) AccessController.doPrivileged(new PrivilegedExceptionAction() {
068                    public Object run() throws IllegalAccessException {   
069                        field.setAccessible(true);
070                        return field.get(object);
071                    }
072                });
073                return value;
074            } catch (PrivilegedActionException pe) {
075                throw new GroovyRuntimeException("Cannot get the property '" + name + "'.", pe.getException());
076            }
077        }
078    
079        /**
080         * Sets the property on the given object to the new value
081         * 
082         * @param object on which to set the property
083         * @param newValue the new value of the property
084         * @throws RuntimeException if the property could not be set
085         */
086        public void setProperty(final Object object, Object newValue) {
087            final Object goalValue = DefaultTypeTransformation.castToType(newValue, field.getType());
088            try {
089                AccessController.doPrivileged(new PrivilegedExceptionAction() {
090                    public Object run() throws IllegalAccessException, GroovyRuntimeException {
091                        field.setAccessible(true);
092                        field.set(object, goalValue);
093                        return null;
094                    }
095                });
096            } catch (PrivilegedActionException ex) {
097                throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", ex.getException());
098            }
099        }
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    }