package org.codehaus.plexus.interpolation;
   
   import java.util.List;
   
   import org.codehaus.plexus.interpolation.fixed.FixedStringSearchInterpolator;
   import org.codehaus.plexus.interpolation.fixed.InterpolationState;
   
   /**
    * 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();
      }
  }