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Lucene example source code file (BooleanQueryNode.java)

This example Lucene source code file (BooleanQueryNode.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

booleanquerynode, booleanquerynode, charsequence, clonenotsupportedexception, groupquerynode, override, querynode, querynode, querynodeimpl, string, string, stringbuilder, stringbuilder, util

The Lucene BooleanQueryNode.java source code

package org.apache.lucene.queryParser.core.nodes;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.List;

import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;

/**
 * A {@link BooleanQueryNode} represents a list of elements which do not have an
 * explicit boolean operator defined between them. It can be used to express a
 * boolean query that intends to use the default boolean operator.
 */
public class BooleanQueryNode extends QueryNodeImpl {

  private static final long serialVersionUID = -2206623652088638072L;

  /**
   * @param clauses
   *          - the query nodes to be and'ed
   */
  public BooleanQueryNode(List<QueryNode> clauses) {
    setLeaf(false);
    allocate();
    set(clauses);
  }

  @Override
  public String toString() {
    if (getChildren() == null || getChildren().size() == 0)
      return "<boolean operation='default'/>";
    StringBuilder sb = new StringBuilder();
    sb.append("<boolean operation='default'>");
    for (QueryNode child : getChildren()) {
      sb.append("\n");
      sb.append(child.toString());
    }
    sb.append("\n</boolean>");
    return sb.toString();
  }

  public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
    if (getChildren() == null || getChildren().size() == 0)
      return "";

    StringBuilder sb = new StringBuilder();
    String filler = "";
    for (QueryNode child : getChildren()) {
      sb.append(filler).append(child.toQueryString(escapeSyntaxParser));
      filler = " ";
    }

    // in case is root or the parent is a group node avoid parenthesis
    if ((getParent() != null && getParent() instanceof GroupQueryNode)
        || isRoot())
      return sb.toString();
    else
      return "( " + sb.toString() + " )";
  }

  @Override
  public QueryNode cloneTree() throws CloneNotSupportedException {
    BooleanQueryNode clone = (BooleanQueryNode) super.cloneTree();

    // nothing to do here

    return clone;
  }

}

Other Lucene examples (source code examples)

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