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1   /*
2    * $Id: MetaBeanProperty.java,v 1.3 2005/01/10 21:22:12 glaforge 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  package groovy.lang;
36  
37  /***
38   * Represents a property on a bean which may have a getter and/or a setter
39   * 
40   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
41   * @author Kim Pilho
42   * @version $Revision: 1.3 $
43   */
44  public class MetaBeanProperty extends MetaProperty {
45  
46      private MetaMethod getter;
47      private MetaMethod setter;
48  
49      public MetaBeanProperty(String name, Class type, MetaMethod getter, MetaMethod setter) {
50  		super(name, type);
51          this.getter = getter;
52          this.setter = setter;
53      }
54  
55      /***
56       * @return the property of the given object
57       * @throws Exception if the property could not be evaluated
58       */
59      public Object getProperty(Object object) throws Exception {
60  		if (getter == null) {
61  			//@todo we probably need a WriteOnlyException class
62  			throw new GroovyRuntimeException("Cannot read write-only property: " + name);
63  		}
64          return getter.invoke(object, MetaClass.EMPTY_ARRAY);
65      }
66  
67      /***
68       * Sets the property on the given object to the new value
69       * 
70       * @param object on which to set the property
71       * @param newValue the new value of the property
72       * @throws Exception if the property could not be set
73       */
74      public void setProperty(Object object, Object newValue) {
75  		if(setter == null) {
76  			throw new GroovyRuntimeException("Cannot set read-only property: " + name);
77  		}
78  
79  		try {
80  			// we'll convert a GString to String if needed
81  			if(getType() == String.class && !(newValue instanceof String))
82  				newValue = newValue.toString();
83  
84  			// Set property for primitive types
85  			if (newValue instanceof java.math.BigDecimal) {
86  				if (getType() == Double.class)
87  					newValue = new Double(((java.math.BigDecimal) newValue).doubleValue());
88  				else if (getType() == Float.class)
89  					newValue = new Float(((java.math.BigDecimal) newValue).floatValue());
90  				else if (getType() == Long.class)
91  					newValue = new Long(((java.math.BigDecimal) newValue).longValue());
92  				else if (getType() == Integer.class)
93  					newValue = new Integer(((java.math.BigDecimal) newValue).intValue());
94  				else if (getType() == Short.class)
95  					newValue = new Short((short) ((java.math.BigDecimal) newValue).intValue());
96  				else if (getType() == Byte.class)
97  					newValue = new Byte((byte) ((java.math.BigDecimal) newValue).intValue());
98  				else if (getType() == Character.class)
99  					newValue = new Character((char) ((java.math.BigDecimal) newValue).intValue());
100 			}
101 			else if (newValue instanceof java.math.BigInteger) {
102 				if (getType() == Long.class)
103 					newValue = new Long(((java.math.BigInteger) newValue).longValue());
104 				else if (getType() == Integer.class)
105 					newValue = new Integer(((java.math.BigInteger) newValue).intValue());
106 				else if (getType() == Short.class)
107 					newValue = new Short((short) ((java.math.BigInteger) newValue).intValue());
108 				else if (getType() == Byte.class)
109 					newValue = new Byte((byte) ((java.math.BigInteger) newValue).intValue());
110 				else if (getType() == Character.class)
111 					newValue = new Character((char) ((java.math.BigInteger) newValue).intValue());
112 			}
113 			else if (newValue instanceof java.lang.Long) {
114 				if (getType() == Integer.class)
115 					newValue = new Integer(((Long) newValue).intValue());
116 				else if (getType() == Short.class)
117 					newValue = new  Short(((Long) newValue).shortValue());
118 				else if (getType() == Byte.class)
119 					newValue = new Byte(((Long) newValue).byteValue());
120 				else if (getType() == Character.class)
121 					newValue = new Character((char) ((Long) newValue).intValue());
122 			}
123 			else if (newValue instanceof java.lang.Integer) {
124 				if (getType() == Short.class)
125 					newValue = new  Short(((Integer) newValue).shortValue());
126 				else if (getType() == Byte.class)
127 					newValue = new Byte(((Integer) newValue).byteValue());
128 				else if (getType() == Character.class)
129 					newValue = new Character((char) ((Integer) newValue).intValue());
130 			}
131 
132 			setter.invoke(object, new Object[] { newValue });
133 		}
134 		catch(Exception e) {
135 			throw new GroovyRuntimeException("Cannot set property: " + name +
136 				" reason: " + e.getMessage(), e);
137 		}
138     }
139 
140     public MetaMethod getGetter() {
141         return getter;
142     }
143 
144     public MetaMethod getSetter() {
145         return setter;
146     }
147 	
148 	/***
149 	 * this is for MetaClass to patch up the object later when looking for get*() methods
150 	 */
151 	void setGetter(MetaMethod getter) {
152 		this.getter = getter;
153 	}
154 	
155 	/***
156 	 * this is for MetaClass to patch up the object later when looking for set*() methods
157 	 */
158 	void setSetter(MetaMethod setter) {
159 		this.setter = setter;
160 	}
161 }