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Lucene example source code file (AllowLeadingWildcardAttributeImpl.java)

This example Lucene source code file (AllowLeadingWildcardAttributeImpl.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

allowleadingwildcardattribute, allowleadingwildcardattribute, allowleadingwildcardattributeimpl, allowleadingwildcardattributeimpl, attributeimpl, override, override, string, unsupportedoperationexception, unsupportedoperationexception

The Lucene AllowLeadingWildcardAttributeImpl.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 org.apache.lucene.queryParser.core.config.QueryConfigHandler;
import org.apache.lucene.queryParser.standard.processors.AllowLeadingWildcardProcessor;
import org.apache.lucene.util.AttributeImpl;

 * This attribute is used by {@link AllowLeadingWildcardProcessor} processor and
 * must be defined in the {@link QueryConfigHandler}. It basically tells the
 * processor if it should allow leading wildcard. <br/>
 * @see org.apache.lucene.queryParser.standard.config.AllowLeadingWildcardAttribute
public class AllowLeadingWildcardAttributeImpl extends AttributeImpl 
				implements AllowLeadingWildcardAttribute {

  private static final long serialVersionUID = -2804763012723049527L;

  { enableBackwards = false; }
  private boolean allowLeadingWildcard = false;  // default in 2.9

  public void setAllowLeadingWildcard(boolean allowLeadingWildcard) {
    this.allowLeadingWildcard = allowLeadingWildcard;

  public boolean isAllowLeadingWildcard() {
    return this.allowLeadingWildcard;

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

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

  public boolean equals(Object other) {

    if (other instanceof AllowLeadingWildcardAttributeImpl
        && ((AllowLeadingWildcardAttributeImpl) other).allowLeadingWildcard == this.allowLeadingWildcard) {

      return true;


    return false;


  public int hashCode() {
    return this.allowLeadingWildcard ? -1 : Integer.MAX_VALUE;

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


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