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Java > Open Source Codes > org > codehaus > aspectwerkz > expression > ExpressionContext


1 /**************************************************************************************
2  * Copyright (c) Jonas BonŽr, Alexandre Vasseur. All rights reserved. *
3  * http://aspectwerkz.codehaus.org *
4  * ---------------------------------------------------------------------------------- *
5  * The software in this package is published under the terms of the LGPL license *
6  * a copy of which has been included with this distribution in the license.txt file. *
7  **************************************************************************************/
8 package org.codehaus.aspectwerkz.expression;
9
10 import org.codehaus.aspectwerkz.reflect.ClassInfo;
11 import org.codehaus.aspectwerkz.reflect.ConstructorInfo;
12 import org.codehaus.aspectwerkz.reflect.FieldInfo;
13 import org.codehaus.aspectwerkz.reflect.MethodInfo;
14 import org.codehaus.aspectwerkz.reflect.ReflectionInfo;
15 import org.codehaus.aspectwerkz.reflect.StaticInitializationInfo;
16
17 import gnu.trove.TIntIntHashMap;
18 import gnu.trove.TObjectIntHashMap;
19
20 /**
21  * The expression context for AST evaluation.
22  *
23  * @author <a HREF="mailto:jboner@codehaus.org">Jonas BonŽr </a>
24  * @author <a HREF="mailto:alex AT gnilux DOT com">Alexandre Vasseur</a>
25  */
26 public class ExpressionContext {
27     public static final int INFO_NOT_AVAILABLE = -1;
28
29     public static final int METHOD_INFO = 0;
30
31     public static final int CONSTRUCTOR_INFO = 1;
32
33     public static final int FIELD_INFO = 2;
34
35     public static final int CLASS_INFO = 3;
36     
37     private static final int STATIC_INFO = 4;
38
39     private final int m_reflectionInfoType;
40
41     private final PointcutType m_pointcutType;
42
43     private final ReflectionInfo m_matchingReflectionInfo;
44
45     private final ReflectionInfo m_withinReflectionInfo;
46
47     private boolean m_inCflowSubAST = false;
48
49     private boolean m_cflowEvaluation = false;
50
51     private boolean m_hasBeenVisitingCflow = false;
52
53     private int m_currentTargetArgsIndex = 0;
54
55     /**
56      * Expression to advised target (method / ctor) argument index map.
57      * It depends on the matching context and the pointcut signature, as well as args(..)
58      */
59     public gnu.trove.TObjectIntHashMap m_exprIndexToTargetIndex = new TObjectIntHashMap();
60
61     /**
62      * The variable name corresponding to the this(..) designator,
63      * or null if nothing is bound (this(<type>) or no this(..))
64      */
65     public String JavaDoc m_thisBoundedName = null;
66
67     /**
68      * The variable name corresponding to the target(..) designator,
69      * or null if nothing is bound (target(<type>) or no target(..))
70      */
71     public String JavaDoc m_targetBoundedName = null;
72
73     /**
74      * Set to true when we encounter a poincut using target(..) and when match cannot be done without a
75      * runtime check with instance of.
76      */
77     public boolean m_targetWithRuntimeCheck = false;
78
79     /**
80      * Creates a new expression context.
81      *
82      * @param pointcutType
83      * @param reflectionInfo - can be null f.e. with early evaluation of CALL pointcut
84      * @param withinReflectionInfo
85      */
86     public ExpressionContext(final PointcutType pointcutType,
87                              final ReflectionInfo reflectionInfo,
88                              final ReflectionInfo withinReflectionInfo) {
89         if (pointcutType == null) {
90             throw new IllegalArgumentException JavaDoc("pointcut type can not be null");
91         }
92         m_pointcutType = pointcutType;
93         m_matchingReflectionInfo = reflectionInfo;
94         if (withinReflectionInfo != null) {
95             m_withinReflectionInfo = withinReflectionInfo;
96         } else {
97             if (PointcutType.EXECUTION.equals(pointcutType)
98                 || PointcutType.STATIC_INITIALIZATION.equals(pointcutType)
99                 || PointcutType.WITHIN.equals(pointcutType)) {
100                 m_withinReflectionInfo = m_matchingReflectionInfo;
101             } else {
102                 m_withinReflectionInfo = null;
103             }
104         }
105         if (reflectionInfo instanceof MethodInfo) {
106             m_reflectionInfoType = METHOD_INFO;
107         } else if (reflectionInfo instanceof ConstructorInfo) {
108             m_reflectionInfoType = CONSTRUCTOR_INFO;
109         } else if (reflectionInfo instanceof FieldInfo) {
110             m_reflectionInfoType = FIELD_INFO;
111         } else if (reflectionInfo instanceof ClassInfo) {
112             m_reflectionInfoType = CLASS_INFO;
113         } else if (reflectionInfo instanceof StaticInitializationInfo) {
114             m_reflectionInfoType = STATIC_INFO;
115         } else {
116             m_reflectionInfoType = INFO_NOT_AVAILABLE;// used for early eval on CALL
117 }
118     }
119
120     public ReflectionInfo getReflectionInfo() {
121         return m_matchingReflectionInfo;
122     }
123
124     public ReflectionInfo getWithinReflectionInfo() {
125         return m_withinReflectionInfo;
126     }
127
128     public boolean hasExecutionPointcut() {
129         return m_pointcutType.equals(PointcutType.EXECUTION);
130     }
131
132     public boolean hasCallPointcut() {
133         return m_pointcutType.equals(PointcutType.CALL);
134     }
135
136     public boolean hasSetPointcut() {
137         return m_pointcutType.equals(PointcutType.SET);
138     }
139
140     public boolean hasGetPointcut() {
141         return m_pointcutType.equals(PointcutType.GET);
142     }
143
144     public boolean hasHandlerPointcut() {
145         return m_pointcutType.equals(PointcutType.HANDLER);
146     }
147
148     public boolean hasStaticInitializationPointcut() {
149         return m_pointcutType.equals(PointcutType.STATIC_INITIALIZATION);
150     }
151
152     public boolean hasWithinPointcut() {
153         return m_pointcutType.equals(PointcutType.WITHIN);
154     }
155 //
156 // public boolean hasHasMethodPointcut() {
157 // return m_pointcutType.equals(PointcutType.HAS_METHOD);
158 // }
159 //
160 // public boolean hasHasFieldPointcut() {
161 // return m_pointcutType.equals(PointcutType.HAS_FIELD);
162 // }
163
164     public boolean hasWithinReflectionInfo() {
165         return m_withinReflectionInfo != null;
166     }
167
168     public boolean hasMethodInfo() {
169         return m_reflectionInfoType == METHOD_INFO;
170     }
171
172     public boolean hasConstructorInfo() {
173         return m_reflectionInfoType == CONSTRUCTOR_INFO;
174     }
175
176     public boolean hasFieldInfo() {
177         return m_reflectionInfoType == FIELD_INFO;
178     }
179
180     public boolean hasClassInfo() {
181         return m_reflectionInfoType == CLASS_INFO;
182     }
183
184     public boolean hasReflectionInfo() {
185         return m_reflectionInfoType != INFO_NOT_AVAILABLE;
186     }
187
188     public void setInCflowSubAST(final boolean inCflowAST) {
189         m_inCflowSubAST = inCflowAST;
190     }
191
192     public boolean inCflowSubAST() {
193         return m_inCflowSubAST;
194     }
195
196     public void setHasBeenVisitingCflow(final boolean hasBeenVisitingCflow) {
197         m_hasBeenVisitingCflow = hasBeenVisitingCflow;
198     }
199
200     public boolean hasBeenVisitingCflow() {
201         return m_hasBeenVisitingCflow;
202     }
203
204     public boolean getCflowEvaluation() {
205         return m_cflowEvaluation;
206     }
207
208     public void setCflowEvaluation(boolean cflowEvaluation) {
209         m_cflowEvaluation = cflowEvaluation;
210     }
211
212     public int getCurrentTargetArgsIndex() {
213         return m_currentTargetArgsIndex;
214     }
215
216     public void setCurrentTargetArgsIndex(int argsIndex) {
217         this.m_currentTargetArgsIndex = argsIndex;
218     }
219
220     public boolean equals(Object JavaDoc o) {
221         if (this == o) {
222             return true;
223         }
224         if (!(o instanceof ExpressionContext)) {
225             return false;
226         }
227         final ExpressionContext expressionContext = (ExpressionContext) o;
228         if (m_reflectionInfoType != expressionContext.m_reflectionInfoType) {
229             return false;
230         }
231         if (!m_matchingReflectionInfo.equals(expressionContext.m_matchingReflectionInfo)) {
232             return false;
233         }
234         if (!m_pointcutType.equals(expressionContext.m_pointcutType)) {
235             return false;
236         }
237         if ((m_withinReflectionInfo != null) ?
238             (!m_withinReflectionInfo
239                 .equals(expressionContext.m_withinReflectionInfo)) :
240             (expressionContext.m_withinReflectionInfo != null)) {
241             return false;
242         }
243         return true;
244     }
245
246     public int hashCode() {
247         int result;
248         result = m_pointcutType.hashCode();
249         result = (29 * result) + m_matchingReflectionInfo.hashCode();
250         result = (29 * result) + ((m_withinReflectionInfo != null) ? m_withinReflectionInfo.hashCode() : 0);
251         result = (29 * result) + m_reflectionInfoType;
252         return result;
253     }
254
255     public PointcutType getPointcutType() {
256         return m_pointcutType;
257     }
258
259     public void resetRuntimeState() {
260         m_targetBoundedName = null;
261         m_thisBoundedName = null;
262         m_exprIndexToTargetIndex = new TObjectIntHashMap();
263         m_targetWithRuntimeCheck = false;
264     }
265 }
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