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package org.codehaus.plexus.interpolation;

import org.codehaus.plexus.interpolation.fixed.FixedStringSearchInterpolator;
import org.codehaus.plexus.interpolation.fixed.InterpolationState;

import java.util.List;

/**
 * A value source that allows a fixed interpolator to be injected into
 * a regular interpolator. This value source encapsulates state, so even though
 * the fixed interpolator can be used as a singleton, a single FixedInterpolatorValueSource
 * can only belong to one interpolator any given time.
 */
public class FixedInterpolatorValueSource implements ValueSource

{
    private final FixedStringSearchInterpolator fixedStringSearchInterpolator;
    private final InterpolationState errorCollector = new InterpolationState();

    public FixedInterpolatorValueSource( FixedStringSearchInterpolator fixedStringSearchInterpolator )
    {
        this.fixedStringSearchInterpolator = fixedStringSearchInterpolator;
    }

    public Object getValue( String expression )
    {
       return fixedStringSearchInterpolator.getValue( expression, errorCollector  );
    }

    public List getFeedback()
    {
        return errorCollector.asList();
    }

    public void clearFeedback()
    {
        errorCollector.clear();

    }
}