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package org.codehaus.plexus.interpolation;
import java.util.List;
/*
* Copyright 2001-2008 Codehaus Foundation.
*
* Licensed 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.
*/
/**
* Supplies one strategy for resolving a value for an interpolation expression.
* ValueSources may be stacked.
* @version $Id: ValueSource.java 7681 2008-08-22 20:34:22Z jdcasey $
*/
public interface ValueSource
{
/**
* @return the value related to the expression, or null if not found.
*/
public Object getValue( String expression );
/**
* Return the feedback about resolution failures for a particular expression.
*
* @return a combination of String and Throwable instances, where strings
* related to throwables are listed first.
*/
List getFeedback();
/**
* Clear the feedback accumulated by a prior interpolation run.
*/
void clearFeedback();
}