package org.codehaus.plexus.interpolation.fixed;
   
   /*
    * Copyright 2014 The 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.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.codehaus.plexus.interpolation.RecursionInterceptor;
  import org.codehaus.plexus.interpolation.SimpleRecursionInterceptor;
  
  /**
   * AN error collector contains the errors accumulated during an interpolation.
   * It is stateful.
   */
  public class InterpolationState {
      private final List<String> messages = new ArrayList<String>();
      private final List<Throwable> causes = new ArrayList<Throwable>();
  
      public void addFeedback(String message, Throwable cause) {
          messages.add(message);
          causes.add(cause);
      }
  
      public List asList() {
          ArrayList<Object> items = new ArrayList<Object>();
          for (int i = 0; i < messages.size(); i++) {
              String msg = messages.get(i);
              if (msg != null) items.add(msg);
              Throwable cause = causes.get(i);
              if (cause != null) items.add(cause);
          }
          return items.size() > 0 ? items : null;
      }
  
      public void clear() {
          messages.clear();
          causes.clear();
          unresolvable.clear();
          recursionInterceptor.clear();
          root = null;
      }
  
      final Set<String> unresolvable = new HashSet<String>();
      RecursionInterceptor recursionInterceptor = new SimpleRecursionInterceptor();
  
      public void setRecursionInterceptor(RecursionInterceptor recursionInterceptor) {
          this.recursionInterceptor = recursionInterceptor;
      }
  
      FixedStringSearchInterpolator root = null;
  }