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<!-- $Id: package.html 155412 2005-02-26 12:58:36Z dirkv $
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Copyright 2001-2004 The Apache Software Foundation.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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<title>Package Documentation for org.apache.commons.digester.substitution Package</title>
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<body bgcolor="white">
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Provides for manipulation of xml attributes and element body text before
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the data is processed by any Rule objects.
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The class org.apache.commons.digester.Substitutor defines an abstract
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interface for mechanisms which manipulate xml attributes and body text.
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The Digester method setSubstitutor can be used to define a concrete
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substitutor that will be applied to the data before it is passed to the
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This package provides some useful concrete implementations of the abstract
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Substitutor class. In particular, it provides an implementation that allows
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the application to define "variables" which the input data can reference
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using a syntax such as "${user.name}".
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<p>Here's an example of setting up the VariableSubstitutor:</p>
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// set up the variables the input xml can reference
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Map vars = new HashMap();
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vars.put("user.name", "me");
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vars.put("os", "Linux");
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// map ${varname} to the entries in the var map
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MultiVariableExpander expander = new MultiVariableExpander();
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expander.addSource("$", vars);
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// allow expansion in both xml attributes and element text
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Substitutor substitutor = new VariableSubstitutor(expander);
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Digester digester = new Digester();
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digester.setSubstitutor(substitutor);