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/* $Id: VariableExpander.java 471661 2006-11-06 08:09:25Z skitching $
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 


package org.apache.commons.digester.substitution;

/**
 * An Interface describing a class capable of expanding strings which
 * may contain variable references. The exact syntax of the "reference",
 * and the mechanism for determining the corresponding value to be used
 * is up to the concrete implementation.
 *
 * @since 1.6
 */
public interface VariableExpander {
    /**
     * Return the input string with any variables replaced by their
     * corresponding value. If there are no variables in the string,
     * then the input parameter is returned unaltered.
     */
    public String expand(String param);
}