土豆片开发日志-solr的facet解读（2）

 土豆片（http://www.tudoupian.com）开发采用更加灵活的solr搜索服务器来实现分层功能。

 

1. FacetField 内嵌了 Count类，Count类保存了被分层出来的的 词 以及该词在搜有搜索出来的文档中出现的次数。

 

package org.apache.solr.client.solrj.response; import java.io.Serializable; import java.util.ArrayList; import java.util.Date; import java.util.List; import org.apache.solr.client.solrj.util.ClientUtils; /** * A utility class to hold the facet response. It could use the NamedList container, * but for JSTL, it is nice to have something that implements List so it can be iterated * * @version $Id: FacetField.java 638357 2008-03-18 13:12:27Z gsingers $ * @since solr 1.3 */ public class FacetField implements Serializable { public static class Count implements Serializable { private String _name = null; private long _count = 0; // hang onto the FacetField for breadcrumb creation convenience private FacetField _ff = null; public Count( FacetField ff, String n, long c ) { _name = n; _count = c; _ff = ff; } public String getName() { return _name; } public void setName( String n ) { _name = n; } public long getCount() { return _count; } public void setCount( long c ) { _count = c; } public FacetField getFacetField() { return _ff; } @Override public String toString() { return _name+" ("+_count+")"; } public String getAsFilterQuery() { if (_ff.getName().equals("facet_queries")) { return _name; } return ClientUtils.escapeQueryChars( _ff._name ) + ":" + ClientUtils.escapeQueryChars( _name ); } } private String _name = null; private List<Count> _values = null; private String _gap = null; private Date _end = null; //......... //.........方法 }

一个FacetField实例拥有多个Count实例。