001    /*
002     * $Id: MetaFieldProperty.java,v 1.3 2005/03/22 16:48:51 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    
042    /**
043     * Represents a property on a bean which may have a getter and/or a setter
044     * 
045     * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
046     * @version $Revision: 1.3 $
047     */
048    public class MetaFieldProperty extends MetaProperty {
049    
050        private Field field;
051    
052        public MetaFieldProperty(Field field) {
053                    super(field.getName(), field.getType());
054                    
055            this.field = field;
056        }
057    
058        /**
059         * @return the property of the given object
060         * @throws Exception if the property could not be evaluated
061         */
062        public Object getProperty(Object object) throws Exception {
063            return field.get(object);
064        }
065    
066        /**
067         * Sets the property on the given object to the new value
068         * 
069         * @param object on which to set the property
070         * @param newValue the new value of the property
071         * @throws Exception if the property could not be set
072         */
073        public void setProperty(Object object, Object newValue) {
074            try {
075                field.set(object, newValue);
076            }
077            catch (IllegalArgumentException e) {
078                try {
079                    field.set(object, InvokerHelper.asType(newValue, field.getType()));
080                }
081                catch (Exception ex) {
082                    throw new TypeMismatchException( "'" + toName(object.getClass()) + "." + field.getName()
083                                                      + "' can not refer to the value '"
084                                                      + newValue + "' (type " + toName(newValue.getClass())
085                                                      + "), because it is of the type " + toName(field.getType()) );
086                }
087            }
088            catch (Exception e) {
089                throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", e);
090            }
091        }
092    
093        private String toName(Class c) {
094            String s = c.toString();
095            if (s.startsWith("class ") && s.length() > 6)
096                return s.substring(6);
097            else
098                return s;
099        }
100    }