content: package org.apache.lucene.queryparser.flexible.aqp.nodes;
  
  import org.apache.lucene.queryparser.flexible.aqp.processors.AqpFuzzyModifierProcessor;
  import org.apache.lucene.queryparser.flexible.core.QueryNodeError;
  import org.apache.lucene.queryparser.flexible.core.messages.QueryParserMessages;
  import org.apache.lucene.queryparser.flexible.core.nodes.ModifierQueryNode;
  import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
  import org.apache.lucene.queryparser.flexible.core.nodes.QueryNodeImpl;
  import org.apache.lucene.queryparser.flexible.core.parser.EscapeQuerySyntax;
  import org.apache.lucene.queryparser.flexible.messages.MessageImpl;
  
  /**
   * {@link AqpFuzzyModifierNode} is consumed by the {@link AqpFuzzyModifierProcessor}
   * which will decide what is the appropriate operation for '~' operator. E.g.
   *
   * <pre>
   *
   *    "foo bar"~5  == slop query node
   *    "foo"~5      == fuzzy search for 'foo'
   *  </pre>
   */
  public class AqpFuzzyModifierNode extends QueryNodeImpl implements QueryNode {
  
      private static final long serialVersionUID = -3059874057254791689L;
      private final Float fuzzy;
  
      public AqpFuzzyModifierNode(QueryNode query, Float fuzzy) {
          if (query == null) {
              throw new QueryNodeError(new MessageImpl(
                      QueryParserMessages.PARAMETER_VALUE_NOT_SUPPORTED, "query", "null"));
          }
  
          allocate();
          setLeaf(false);
          add(query);
          this.fuzzy = fuzzy;
      }
  
      public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
          if (getChild() == null)
              return "";
  
          String leftParenthensis = "";
          String rightParenthensis = "";
  
          if (getChild() != null && getChild() instanceof ModifierQueryNode) {
              leftParenthensis = "(";
              rightParenthensis = ")";
          }
  
          return leftParenthensis + getChild().toQueryString(escapeSyntaxParser)
                  + rightParenthensis + "~" + this.fuzzy.toString();
  
      }
  
      public String toString() {
          return "<fuzzy value='" + this.fuzzy.toString() + "'>" + "\n"
                  + getChild().toString() + "\n</fuzzy>";
      }
  
      public QueryNode getChild() {
          return getChildren().get(0);
      }
  
      public Float getFuzzyValue() {
          return fuzzy;
      }
  
  }
  