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Lucene example source code file (MultiFieldAttributeImpl.java)

This example Lucene source code file (MultiFieldAttributeImpl.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

attributeimpl, charsequence, charsequence, multifieldattribute, multifieldattributeimpl, multifieldattributeimpl, override, override, string, unsupportedoperationexception, unsupportedoperationexception, util

The Lucene MultiFieldAttributeImpl.java source code

package org.apache.lucene.queryParser.standard.config;

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.util.Arrays;

import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
import org.apache.lucene.queryParser.standard.processors.MultiFieldQueryNodeProcessor;
import org.apache.lucene.util.AttributeImpl;

 * This attribute is used by {@link MultiFieldQueryNodeProcessor} processor and
 * must be defined in the {@link QueryConfigHandler}. This attribute tells the
 * processor to which fields the terms in the query should be expanded. <br/>
 * @see org.apache.lucene.queryParser.standard.config.MultiFieldAttribute
public class MultiFieldAttributeImpl extends AttributeImpl
				implements MultiFieldAttribute {

  private static final long serialVersionUID = -6809760312720049526L;

  { enableBackwards = false; }
  private CharSequence[] fields;

  public MultiFieldAttributeImpl() {
    // empty constructor

  public void setFields(CharSequence[] fields) {
    this.fields = fields;

  public CharSequence[] getFields() {
    return this.fields;

  public void clear() {
    throw new UnsupportedOperationException();

  public void copyTo(AttributeImpl target) {
    throw new UnsupportedOperationException();

  public boolean equals(Object other) {

    if (other instanceof MultiFieldAttributeImpl) {
    	MultiFieldAttributeImpl fieldsAttr = (MultiFieldAttributeImpl) other;

      return Arrays.equals(this.fields, fieldsAttr.fields);


    return false;


  public int hashCode() {
    return Arrays.hashCode(this.fields);

  public String toString() {
    return "<fieldsAttribute fields=" + Arrays.toString(this.fields) + "/>";


Other Lucene examples (source code examples)

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