--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/goodjava/lucene/queryparser/NumberFieldParser.java	Fri Mar 20 10:58:53 2020 -0600
@@ -0,0 +1,88 @@
+package goodjava.lucene.queryparser;
+
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.NumericRangeQuery;
+import org.apache.lucene.search.SortField;
+import org.apache.lucene.search.PrefixQuery;
+import org.apache.lucene.index.Term;
+import goodjava.parser.ParseException;
+
+
+public abstract class NumberFieldParser implements FieldParser {
+
+	@Override public final Query getQuery(SaneQueryParser qp,String field,String query) throws ParseException {
+		if( query.equals("*") )
+			return new PrefixQuery(new Term(field,""));
+		return getRangeQuery(qp,field,query,query,true,true);
+	}
+
+	@Override public final Query getRangeQuery(SaneQueryParser qp,String field,String minQuery,String maxQuery,boolean includeMin,boolean includeMax) throws ParseException {
+		try {
+			return getRangeQuery(field,minQuery,maxQuery,includeMin,includeMax);
+		} catch(NumberFormatException e) {
+			throw qp.exception(e);
+		}
+	}
+
+	abstract protected Query getRangeQuery(String field,String minQuery,String maxQuery,boolean includeMin,boolean includeMax);
+
+	@Override public SortField getSortField(SaneQueryParser qp,String field,boolean reverse) {
+		return new SortField( field, sortType(), reverse );
+	}
+
+	abstract protected SortField.Type sortType();
+
+
+	public static final FieldParser INT = new NumberFieldParser() {
+
+		@Override protected Query getRangeQuery(String field,String minQuery,String maxQuery,boolean includeMin,boolean includeMax) {
+			Integer min = minQuery.equals("*") ? null : Integer.valueOf(minQuery);
+			Integer max = maxQuery.equals("*") ? null : Integer.valueOf(maxQuery);
+			return NumericRangeQuery.newIntRange(field,min,max,includeMin,includeMax);
+		}
+
+		@Override protected SortField.Type sortType() {
+			return SortField.Type.INT;
+		}
+	};
+
+	public static final FieldParser LONG = new NumberFieldParser() {
+
+		@Override protected Query getRangeQuery(String field,String minQuery,String maxQuery,boolean includeMin,boolean includeMax) {
+			Long min = minQuery.equals("*") ? null : Long.valueOf(minQuery);
+			Long max = maxQuery.equals("*") ? null : Long.valueOf(maxQuery);
+			return NumericRangeQuery.newLongRange(field,min,max,includeMin,includeMax);
+		}
+
+		@Override protected SortField.Type sortType() {
+			return SortField.Type.LONG;
+		}
+	};
+
+	public static final FieldParser FLOAT = new NumberFieldParser() {
+
+		@Override protected Query getRangeQuery(String field,String minQuery,String maxQuery,boolean includeMin,boolean includeMax) {
+			Float min = minQuery.equals("*") ? null : Float.valueOf(minQuery);
+			Float max = maxQuery.equals("*") ? null : Float.valueOf(maxQuery);
+			return NumericRangeQuery.newFloatRange(field,min,max,includeMin,includeMax);
+		}
+
+		@Override protected SortField.Type sortType() {
+			return SortField.Type.FLOAT;
+		}
+	};
+
+	public static final FieldParser DOUBLE = new NumberFieldParser() {
+
+		@Override protected Query getRangeQuery(String field,String minQuery,String maxQuery,boolean includeMin,boolean includeMax) {
+			Double min = minQuery.equals("*") ? null : Double.valueOf(minQuery);
+			Double max = maxQuery.equals("*") ? null : Double.valueOf(maxQuery);
+			return NumericRangeQuery.newDoubleRange(field,min,max,includeMin,includeMax);
+		}
+
+		@Override protected SortField.Type sortType() {
+			return SortField.Type.DOUBLE;
+		}
+	};
+
+}