annotate src/goodjava/lucene/api/LuceneUtils.java @ 1487:044a360c2300

minor
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 01 May 2020 16:17:20 -0600
parents e5d48b85351c
children c62324841dfb
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1 package goodjava.lucene.api;
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2
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3 import java.util.Map;
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4 import java.util.HashMap;
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5 import java.util.List;
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6 import java.util.ArrayList;
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7 import org.apache.lucene.document.Document;
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8 import org.apache.lucene.index.IndexableField;
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9 import org.apache.lucene.index.Term;
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10 import org.apache.lucene.util.BytesRef;
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11 import org.apache.lucene.util.NumericUtils;
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12
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13
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14 public final class LuceneUtils {
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15 private LuceneUtils() {} // never
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16
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17 public static Object getValue(IndexableField ifld) {
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18 BytesRef br = ifld.binaryValue();
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19 if( br != null )
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20 return br.bytes;
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21 Number n = ifld.numericValue();
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22 if( n != null )
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23 return n;
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24 String s = ifld.stringValue();
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25 if( s != null )
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26 return s;
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27 throw new RuntimeException("invalid field type for "+ifld);
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28 }
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29
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30 public static Map<String,Object> toMap(Document doc) {
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31 if( doc==null )
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32 return null;
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33 Map<String,Object> map = new HashMap<String,Object>();
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34 for( IndexableField ifld : doc ) {
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35 String name = ifld.name();
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36 Object value = getValue(ifld);
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37 Object old = map.get(name);
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38 if( old == null ) {
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39 map.put(name,value);
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40 } else {
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41 List list;
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42 if( old instanceof List ) {
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43 list = (List)old;
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44 } else {
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45 list = new ArrayList();
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46 list.add(old);
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47 map.put(name,list);
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48 }
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49 list.add(value);
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50 }
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51 }
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52 return map;
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53 }
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54
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55 public static Term term(String name,Object value) {
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56 if( value instanceof String ) {
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57 return new Term(name,(String)value);
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58 } else if( value instanceof Long ) {
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59 BytesRef br = new BytesRef();
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60 NumericUtils.longToPrefixCoded((Long)value,0,br);
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61 return new Term(name,br);
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62 } else if( value instanceof Integer ) {
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63 BytesRef br = new BytesRef();
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64 NumericUtils.intToPrefixCoded((Integer)value,0,br);
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65 return new Term(name,br);
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66 } else
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67 throw new RuntimeException("invalid value type "+value.getClass()+"' for term '"+name+"'");
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68 }
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69
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70 }