AqpBooleanQueryNode.java

package org.apache.lucene.queryparser.flexible.aqp.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.flexible.core.nodes.BooleanQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.GroupQueryNode;
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.ModifierQueryNode.Modifier;
import org.apache.lucene.queryparser.flexible.core.parser.EscapeQuerySyntax;

/**
 * A {@link AqpBooleanQueryNode} represents base boolean operation performed on
 * a list of nodes. It will apply the @{link ModifierQueryNode} to the clauses.
 * The normal behaviour is not to override the ModifierQueryNode values, if
 * already present.
 */
public class AqpBooleanQueryNode extends BooleanQueryNode {

  private static final long serialVersionUID = -5974910790857168198L;

  protected String operator = "DEFOP";
  protected boolean overrideModifiers = false;

  /**
   * @param clauses
   *          - the query nodes to be op'ed
   */
  public AqpBooleanQueryNode(List<QueryNode> clauses) {
    super(clauses);

  }

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

    }
    sb.append("\n</boolean>");
    return sb.toString();
  }

  @Override
  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 = " " + operator + " ";
    }

    // 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() + " )";
  }

  public void applyModifier(List<QueryNode> clauses, Modifier mod) {
    for (int i = 0; i < clauses.size(); i++) {
      QueryNode child = clauses.get(i);

      if (child instanceof ModifierQueryNode || child instanceof GroupQueryNode) {
        if (overrideModifiers) {
          clauses
              .set(i,
                  new ModifierQueryNode(((ModifierQueryNode) child).getChild(),
                      mod));
        }
      } else {
        clauses.set(i, new ModifierQueryNode(child, mod));
      }
    }
  }

  public void setOverrideModifiers(boolean val) {
    this.overrideModifiers = val;
  }

  public void setOperator(String op) {
    operator = op;
  }

  public String getOperator() {
    return operator;
  }
}