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    1   package org.apache.lucene.queryParser.core.nodes;
    2   
    3   /**
    4    * Licensed to the Apache Software Foundation (ASF) under one or more
    5    * contributor license agreements.  See the NOTICE file distributed with
    6    * this work for additional information regarding copyright ownership.
    7    * The ASF licenses this file to You under the Apache License, Version 2.0
    8    * (the "License"); you may not use this file except in compliance with
    9    * the License.  You may obtain a copy of the License at
   10    *
   11    *     http://www.apache.org/licenses/LICENSE-2.0
   12    *
   13    * Unless required by applicable law or agreed to in writing, software
   14    * distributed under the License is distributed on an "AS IS" BASIS,
   15    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   16    * See the License for the specific language governing permissions and
   17    * limitations under the License.
   18    */
   19   
   20   import java.util.List;
   21   
   22   import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;
   23   
   24   /**
   25    * A {@link AndQueryNode} represents an AND boolean operation performed on a
   26    * list of nodes.
   27    */
   28   public class AndQueryNode extends BooleanQueryNode {
   29   
   30     private static final long serialVersionUID = 118496077529151825L;
   31   
   32     /**
   33      * @param clauses
   34      *          - the query nodes to be and'ed
   35      */
   36     public AndQueryNode(List<QueryNode> clauses) {
   37       super(clauses);
   38       if ((clauses == null) || (clauses.size() == 0)) {
   39         throw new IllegalArgumentException(
   40             "AND query must have at least one clause");
   41       }
   42     }
   43   
   44     @Override
   45     public String toString() {
   46       if (getChildren() == null || getChildren().size() == 0)
   47         return "<boolean operation='and'/>";
   48       StringBuilder sb = new StringBuilder();
   49       sb.append("<boolean operation='and'>");
   50       for (QueryNode child : getChildren()) {
   51         sb.append("\n");
   52         sb.append(child.toString());
   53   
   54       }
   55       sb.append("\n</boolean>");
   56       return sb.toString();
   57     }
   58   
   59     @Override
   60     public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
   61       if (getChildren() == null || getChildren().size() == 0)
   62         return "";
   63   
   64       StringBuilder sb = new StringBuilder();
   65       String filler = "";
   66       for (QueryNode child : getChildren()) {
   67         sb.append(filler).append(child.toQueryString(escapeSyntaxParser));
   68         filler = " AND ";
   69       }
   70   
   71       // in case is root or the parent is a group node avoid parenthesis
   72       if ((getParent() != null && getParent() instanceof GroupQueryNode)
   73           || isRoot())
   74         return sb.toString();
   75       else
   76         return "( " + sb.toString() + " )";
   77     }
   78   
   79   }

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