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| <title>Package Documentation for org.apache.commons.digester.substitution Package</title> |
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| Provides for manipulation of xml attributes and element body text before |
| the data is processed by any Rule objects. |
| <br><br> |
| <p> |
| The class org.apache.commons.digester.Substitutor defines an abstract |
| interface for mechanisms which manipulate xml attributes and body text. |
| The Digester method setSubstitutor can be used to define a concrete |
| substitutor that will be applied to the data before it is passed to the |
| matching rules. |
| </p> |
| <p> |
| This package provides some useful concrete implementations of the abstract |
| Substitutor class. In particular, it provides an implementation that allows |
| the application to define "variables" which the input data can reference |
| using a syntax such as "${user.name}". |
| </p> |
| <p>Here's an example of setting up the VariableSubstitutor:</p> |
| <pre> |
| // set up the variables the input xml can reference |
| Map vars = new HashMap(); |
| vars.put("user.name", "me"); |
| vars.put("os", "Linux"); |
| |
| // map ${varname} to the entries in the var map |
| MultiVariableExpander expander = new MultiVariableExpander(); |
| expander.addSource("$", vars); |
| |
| // allow expansion in both xml attributes and element text |
| Substitutor substitutor = new VariableSubstitutor(expander); |
| |
| Digester digester = new Digester(); |
| digester.setSubstitutor(substitutor); |
| </pre> |
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