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Source code: com/ibatis/sqlmap/engine/accessplan/AccessPlanFactory.java


1   /*
2    *  Copyright 2004 Clinton Begin
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License.
15   */
16  package com.ibatis.sqlmap.engine.accessplan;
17  
18  import java.util.Map;
19  
20  /**
21   * Factory to get an accesss plan appropriate for an object
22   */
23  public class AccessPlanFactory {
24  
25    private static boolean bytecodeEnhancementEnabled = false;
26  
27    private AccessPlanFactory() {
28    }
29  
30    /**
31     * Creates an access plan for working with a bean
32     *
33     * @param clazz
34     * @param propertyNames
35     * @return An access plan
36     */
37    public static AccessPlan getAccessPlan(Class clazz, String[] propertyNames) {
38      AccessPlan plan;
39  
40      boolean complex = false;
41  
42      if (clazz == null || propertyNames == null) {
43        complex = true;
44      } else {
45        for (int i = 0; i < propertyNames.length; i++) {
46          if (propertyNames[i].indexOf('[') > -1
47              || propertyNames[i].indexOf('.') > -1) {
48            complex = true;
49            break;
50          }
51        }
52      }
53  
54      if (complex) {
55        plan = new ComplexAccessPlan(clazz, propertyNames);
56      } else if (Map.class.isAssignableFrom(clazz)) {
57        plan = new MapAccessPlan(clazz, propertyNames);
58      } else {
59        // Possibly causes bug 945746 --but the bug is unconfirmed (can't be reproduced)
60        if (bytecodeEnhancementEnabled) {
61          try {
62            plan = new EnhancedPropertyAccessPlan(clazz, propertyNames);
63          } catch (Throwable t) {
64            try {
65              plan = new PropertyAccessPlan(clazz, propertyNames);
66            } catch (Throwable t2) {
67              plan = new ComplexAccessPlan(clazz, propertyNames);
68            }
69          }
70        } else {
71          try {
72            plan = new PropertyAccessPlan(clazz, propertyNames);
73          } catch (Throwable t) {
74            plan = new ComplexAccessPlan(clazz, propertyNames);
75          }
76        }
77      }
78      return plan;
79    }
80  
81    /**
82     * Tells whether or not bytecode enhancement (CGLIB, etc) is enabled
83     *
84     * @return true if bytecode enhancement is enabled
85     */
86    public static boolean isBytecodeEnhancementEnabled() {
87      return bytecodeEnhancementEnabled;
88    }
89  
90    /**
91     * Turns on or off bytecode enhancement (CGLIB, etc)
92     *
93     * @param bytecodeEnhancementEnabled - the switch
94     */
95    public static void setBytecodeEnhancementEnabled(boolean bytecodeEnhancementEnabled) {
96      AccessPlanFactory.bytecodeEnhancementEnabled = bytecodeEnhancementEnabled;
97    }
98  
99  }