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package org.apache.lucene.queryParser.core.config;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.util.LinkedList;
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import org.apache.lucene.queryParser.core.processors.QueryNodeProcessor;
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import org.apache.lucene.queryParser.core.util.StringUtils;
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import org.apache.lucene.util.Attribute;
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import org.apache.lucene.util.AttributeSource;
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* This class can be used to hold any query configuration and no field
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* configuration. For field configuration, it creates a empty
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* {@link FieldConfig} object and delegate it to field config listeners,
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* these are responsible for setting up all the field configuration.
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* {@link QueryConfigHandler} should be extended by classes that intends to
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* provide configuration to {@link QueryNodeProcessor} objects.
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* This class extends {@link AttributeSource}, so {@link Attribute}s can be
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* The class that extends {@link QueryConfigHandler} should also provide
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* {@link FieldConfig} objects for each collection field.
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* @see FieldConfigListener
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* @see QueryConfigHandler
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public abstract class QueryConfigHandler extends AbstractQueryConfig {
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private LinkedList<FieldConfigListener> listeners = new LinkedList<FieldConfigListener>();
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* Returns an implementation of
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* {@link FieldConfig} for a specific field name. If the implemented
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* {@link QueryConfigHandler} does not know a specific field name, it may
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* return <code>null</code>, indicating there is no configuration for that
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* @return a {@link FieldConfig} object containing the field name
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* configuration or <code>null</code>, if the implemented
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* {@link QueryConfigHandler} has no configuration for that field
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* @deprecated use {@link #getFieldConfig(String)} instead
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public FieldConfig getFieldConfig(CharSequence fieldName) {
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return getFieldConfig(StringUtils.toString(fieldName));
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* Returns an implementation of
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* {@link FieldConfig} for a specific field name. If the implemented
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* {@link QueryConfigHandler} does not know a specific field name, it may
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* return <code>null</code>, indicating there is no configuration for that
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* @return a {@link FieldConfig} object containing the field name
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* configuration or <code>null</code>, if the implemented
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* {@link QueryConfigHandler} has no configuration for that field
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public FieldConfig getFieldConfig(String fieldName) {
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FieldConfig fieldConfig = new FieldConfig(fieldName);
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for (FieldConfigListener listener : this.listeners) {
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listener.buildFieldConfig(fieldConfig);
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* Adds a listener. The added listeners are called in the order they are
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* the listener to be added
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public void addFieldConfigListener(FieldConfigListener listener) {
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this.listeners.add(listener);