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package org.codehaus.plexus.interpolation;

/*
 * 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.
 */

import java.util.ArrayList;
import java.util.List;

public abstract class AbstractValueSource implements ValueSource {

    private final List feedback;

    protected AbstractValueSource(boolean usesFeedback) {
        if (usesFeedback) {
            feedback = new ArrayList();
        } else {
            feedback = null;
        }
    }

    public void clearFeedback() {
        if (feedback != null) {
            feedback.clear();
        }
    }

    public List getFeedback() {
        return feedback;
    }

    protected void addFeedback(String message) {
        feedback.add(message);
    }

    protected void addFeedback(String message, Throwable cause) {
        feedback.add(message);
        feedback.add(cause);
    }
}