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    31 <body>

    32 Provides some useful class and method adapters. <i>The preferred way of using

    33 	these adapters is by chaining them together and to custom adapters (instead of

    34 	inheriting from them)</i>. Indeed this approach provides more combination

    35 possibilities than inheritance. For instance, suppose you want to implement an

    36 adapter MyAdapter than needs sorted local variables and intermediate stack map

    37 frame values taking into account the local variables sort. By using inheritance,

    38 this would require MyAdapter to extend AnalyzerAdapter, itself extending

    39 LocalVariablesSorter. But AnalyzerAdapter is not a subclass of

    40 LocalVariablesSorter, so this is not possible. On the contrary, by using

    41 delegation, you can make LocalVariablesSorter delegate to AnalyzerAdapter,

    42 itself delegating to MyAdapter. In this case AnalyzerAdapter computes

    43 intermediate frames based on the output of LocalVariablesSorter, and MyAdapter

    44 can add new locals by calling the newLocal method on LocalVariablesSorter, and

    45 can get the stack map frame state before each instruction by reading the locals

    46 and stack fields in AnalyzerAdapter (this requires references from MyAdapter

    47 back to LocalVariablesSorter and AnalyzerAdapter).

    48 </body>
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 21 Aug 2010 06:25:44 -0400
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