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| * ASM: a very small and fast Java bytecode manipulation framework |
| * Copyright (c) 2000-2005 INRIA, France Telecom |
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| <body> |
| Provides some useful class and method adapters. <i>The preferred way of using |
| these adapters is by chaining them together and to custom adapters (instead of |
| inheriting from them)</i>. Indeed this approach provides more combination |
| possibilities than inheritance. For instance, suppose you want to implement an |
| adapter MyAdapter than needs sorted local variables and intermediate stack map |
| frame values taking into account the local variables sort. By using inheritance, |
| this would require MyAdapter to extend AnalyzerAdapter, itself extending |
| LocalVariablesSorter. But AnalyzerAdapter is not a subclass of |
| LocalVariablesSorter, so this is not possible. On the contrary, by using |
| delegation, you can make LocalVariablesSorter delegate to AnalyzerAdapter, |
| itself delegating to MyAdapter. In this case AnalyzerAdapter computes |
| intermediate frames based on the output of LocalVariablesSorter, and MyAdapter |
| can add new locals by calling the newLocal method on LocalVariablesSorter, and |
| can get the stack map frame state before each instruction by reading the locals |
| and stack fields in AnalyzerAdapter (this requires references from MyAdapter |
| back to LocalVariablesSorter and AnalyzerAdapter). |
| </body> |
