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Lucene example source code file (PhraseSlopQueryNode.java)

This example Lucene source code file (PhraseSlopQueryNode.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

charsequence, charsequence, clonenotsupportedexception, fieldablenode, fieldablenode, float, override, phraseslopquerynode, phraseslopquerynode, querynode, querynode, querynodeexception, querynodeimpl, string

The Lucene PhraseSlopQueryNode.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 org.apache.lucene.messages.MessageImpl;
import org.apache.lucene.queryParser.core.QueryNodeError;
import org.apache.lucene.queryParser.core.QueryNodeException;
import org.apache.lucene.queryParser.core.QueryNodeParseException;
import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;

public class PhraseSlopQueryNode extends QueryNodeImpl implements FieldableNode {

  private static final long serialVersionUID = 0L;

  private int value = 0;

  /**
   * @throws QueryNodeException
   * @throws QueryNodeParseException
   * @exception QueryNodeParseException
   *              throw in overridden method to disallow
   */
  public PhraseSlopQueryNode(QueryNode query, int value)
      throws QueryNodeException {
    if (query == null) {
      throw new QueryNodeError(new MessageImpl(
          QueryParserMessages.NODE_ACTION_NOT_SUPPORTED, "query", "null"));
    }

    this.value = value;
    setLeaf(false);
    allocate();
    add(query);
  }

  public QueryNode getChild() {
    return getChildren().get(0);
  }

  public int getValue() {
    return this.value;
  }

  private CharSequence getValueString() {
    Float f = Float.valueOf(this.value);
    if (f == f.longValue())
      return "" + f.longValue();
    else
      return "" + f;

  }

  @Override
  public String toString() {
    return "<phraseslop value='" + getValueString() + "'>" + "\n"
        + getChild().toString() + "\n</phraseslop>";
  }

  public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
    if (getChild() == null)
      return "";
    return getChild().toQueryString(escapeSyntaxParser) + "~"
        + getValueString();
  }

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

    clone.value = this.value;

    return clone;
  }

  public CharSequence getField() {
    QueryNode child = getChild();

    if (child instanceof FieldableNode) {
      return ((FieldableNode) child).getField();
    }

    return null;

  }

  public void setField(CharSequence fieldName) {
    QueryNode child = getChild();

    if (child instanceof FieldableNode) {
      ((FieldableNode) child).setField(fieldName);
    }

  }

}

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