FieldRttiImpl


1   /*
2    * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright notice.  All rights reserved.
3    */
4   package com.tc.aspectwerkz.joinpoint.impl;
5   
6   import com.tc.aspectwerkz.joinpoint.FieldRtti;
7   import com.tc.aspectwerkz.joinpoint.Rtti;
8   
9   import java.lang.ref.WeakReference  ;
10  import java.lang.reflect.Field  ;
11  
12  /**
13   * Implementation for the field signature.
14   *
15   * @author <a HREF="mailto:jboner@codehaus.org">Jonas Bon�r </a>
16   */
17  public class FieldRttiImpl implements FieldRtti {
18    private final FieldSignatureImpl m_signature;
19  
20    private WeakReference   m_thisRef;
21  
22    private WeakReference   m_targetRef;
23  
24    private Object   m_fieldValue;
25  
26    /**
27     * Creates a new field RTTI.
28     *
29     * @param signature
30     * @param thisInstance
31     * @param targetInstance
32     */
33    public FieldRttiImpl(final FieldSignatureImpl signature, final Object   thisInstance, final Object   targetInstance) {
34      m_signature = signature;
35      m_thisRef = new WeakReference  (thisInstance);
36      m_targetRef = new WeakReference  (targetInstance);
37    }
38  
39    /**
40     * Clones the RTTI instance.
41     *
42     * @param thisInstance
43     * @param targetInstance
44     * @return
45     */
46    public Rtti cloneFor(final Object   thisInstance, final Object   targetInstance) {
47      return new FieldRttiImpl(m_signature, thisInstance, targetInstance);
48    }
49  
50    /**
51     * Returns the target instance.
52     *
53     * @return the target instance
54     */
55    public Object   getTarget() {
56      return m_targetRef.get();
57    }
58  
59    /**
60     * Returns the instance currently executing.
61     *
62     * @return the instance currently executing
63     */
64    public Object   getThis() {
65      return m_thisRef.get();
66    }
67  
68    /**
69     * Returns the declaring class.
70     *
71     * @return the declaring class
72     */
73    public Class   getDeclaringType() {
74      return m_signature.getDeclaringType();
75    }
76  
77    /**
78     * Returns the modifiers for the signature. <p/>Could be used like this:
79     * <p/>
80     * <pre>
81     * boolean isPublic = java.lang.reflect.Modifier.isPublic(signature.getModifiers());
82     * </pre>
83     *
84     * @return the mofifiers
85     */
86    public int getModifiers() {
87      return m_signature.getModifiers();
88    }
89  
90    /**
91     * Returns the name (f.e. name of method of field).
92     *
93     * @return the name
94     */
95    public String   getName() {
96      return m_signature.getName();
97    }
98  
99    /**
100    * Returns the field.
101    *
102    * @return the field
103    */
104   public Field   getField() {
105     return m_signature.getField();
106   }
107 
108   /**
109    * Returns the field type.
110    *
111    * @return the field type
112    */
113   public Class   getFieldType() {
114     return m_signature.getFieldType();
115   }
116 
117   /**
118    * Returns the value of the field.
119    *
120    * @return the value of the field
121    */
122   public Object   getFieldValue() {
123     return m_fieldValue;
124   }
125 
126   /**
127    * Sets the value of the field.
128    *
129    * @param fieldValue the value of the field
130    */
131   public void setFieldValue(final Object   fieldValue) {
132     m_fieldValue = fieldValue;
133   }
134 
135   /**
136    * Returns a string representation of the signature.
137    *
138    * @return a string representation
139    * @TODO: implement toString to something meaningful
140    */
141   public String   toString() {
142     return super.toString();
143   }
144 
145   /**
146    * TODO: Needed for JIT compiler. Remove for 2.0.
147    *
148    * @return
149    */
150   public Object  [] getParameterValues() {
151     return new Object  []{m_fieldValue};
152   }
153 }
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