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/* $Id: VariableExpander.java 155412 2005-02-26 12:58:36Z dirkv $
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* Copyright 2003-2004 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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package org.apache.commons.digester.substitution;
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* <p>An Interface describing a class capable of expanding strings which
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* may contain variable references. The exact syntax of the "reference",
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* and the mechanism for determining the corresponding value to be used
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* is up to the concrete implementation.</p>
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public interface VariableExpander {
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* Return the input string with any variables replaced by their
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* corresponding value. If there are no variables in the string,
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* then the input parameter is returned unaltered.
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public String expand(String param);