booleanfilterbuilder.java

lucene2.2.0版本

/*
 * Created on 25-Jan-2006
 */
package org.apache.lucene.xmlparser.builders;

import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanFilter;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.FilterClause;
import org.apache.lucene.xmlparser.DOMUtils;
import org.apache.lucene.xmlparser.FilterBuilder;
import org.apache.lucene.xmlparser.ParserException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * 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.
 */
/**
 * @author maharwood 
 */
public class BooleanFilterBuilder implements FilterBuilder {
	
	private FilterBuilder factory;

	public BooleanFilterBuilder(FilterBuilder factory)
	{
		this.factory=factory;
	}

	public Filter getFilter(Element e) throws ParserException {
		BooleanFilter bf=new BooleanFilter();
		NodeList nl = e.getChildNodes();
		
		for(int i=0;i<nl.getLength();i++)
		{
			Node node = nl.item(i);
			if(node.getNodeName().equals("Clause"))
			{
				Element clauseElem=(Element) node;
				BooleanClause.Occur occurs=BooleanQueryBuilder.getOccursValue(clauseElem);
			
	 			Element clauseFilter=DOMUtils.getFirstChildOrFail(clauseElem);
	 			Filter f=factory.getFilter(clauseFilter);
	 			bf.add(new FilterClause(f,occurs));
			}
		}
		
		return bf;
	}

}