* <td>String
* <td>Yes
* <td>N/A
* </tr>
* <tr>
* <td>lowerTerm
* <td>Specified by
type
* <td>Yes
* <td>N/A
* </tr>
* <tr>
* <td>upperTerm
* <td>Specified by
type
* <td>Yes
* <td>N/A
* </tr>
* <tr>
* <td>type
* <td>int, long, float, double
* <td>No
* <td>int
* </tr>
* <tr>
* <td>includeLower
* <td>true, false
* <td>No
* <td>true
* </tr>
* <tr>
* <td>includeUpper
* <td>true, false
* <td>No
* <td>true
* </tr>
* <tr>
* <td>precisionStep
* <td>Integer
* <td>No
* <td>4
* </tr>
* </table>
* <p>
* If an error occurs parsing the supplied <tt>lowerTerm or
* <tt>upperTerm into the numeric type specified by
type, then the
* error will be silently ignored and the resulting filter will not match any
* documents.
*/
public class NumericRangeFilterBuilder implements FilterBuilder {
private static final NoMatchFilter NO_MATCH_FILTER = new NoMatchFilter();
private boolean strictMode = false;
/**
* Specifies how this {@link NumericRangeFilterBuilder} will handle errors.
* <p>
* If this is set to true, {@link #getFilter(Element)} will throw a
* {@link ParserException} if it is unable to parse the lowerTerm or upperTerm
* into the appropriate numeric type. If this is set to false, then this
* exception will be silently ignored and the resulting filter will not match
* any documents.
* <p>
* Defaults to false.
*
* @param strictMode
*/
public void setStrictMode(boolean strictMode) {
this.strictMode = strictMode;
}
public Filter getFilter(Element e) throws ParserException {
String field = DOMUtils.getAttributeWithInheritanceOrFail(e, "fieldName");
String lowerTerm = DOMUtils.getAttributeOrFail(e, "lowerTerm");
String upperTerm = DOMUtils.getAttributeOrFail(e, "upperTerm");
boolean lowerInclusive = DOMUtils.getAttribute(e, "includeLower", true);
boolean upperInclusive = DOMUtils.getAttribute(e, "includeUpper", true);
int precisionStep = DOMUtils.getAttribute(e, "precisionStep", NumericUtils.PRECISION_STEP_DEFAULT);
String type = DOMUtils.getAttribute(e, "type", "int");
try {
Filter filter;
if (type.equalsIgnoreCase("int")) {
filter = NumericRangeFilter.newIntRange(field, precisionStep, Integer
.valueOf(lowerTerm), Integer.valueOf(upperTerm), lowerInclusive,
upperInclusive);
} else if (type.equalsIgnoreCase("long")) {
filter = NumericRangeFilter.newLongRange(field, precisionStep, Long
.valueOf(lowerTerm), Long.valueOf(upperTerm), lowerInclusive,
upperInclusive);
} else if (type.equalsIgnoreCase("double")) {
filter = NumericRangeFilter.newDoubleRange(field, precisionStep, Double
.valueOf(lowerTerm), Double.valueOf(upperTerm), lowerInclusive,
upperInclusive);
} else if (type.equalsIgnoreCase("float")) {
filter = NumericRangeFilter.newFloatRange(field, precisionStep, Float
.valueOf(lowerTerm), Float.valueOf(upperTerm), lowerInclusive,
upperInclusive);
} else {
throw new ParserException(
"type attribute must be one of: [long, int, double, float]");
}
return filter;
} catch (NumberFormatException nfe) {
if (strictMode) {
throw new ParserException(
"Could not parse lowerTerm or upperTerm into a number", nfe);
}
return NO_MATCH_FILTER;
}
}
static class NoMatchFilter extends Filter {
private static final long serialVersionUID = 1L;
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
return null;
}
}
}
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The Lucene NumericRangeFilterBuilder.java source code
package org.apache.lucene.xmlparser.builders;
/**
* 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.
*/
import java.io.IOException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.NumericRangeFilter;
import org.apache.lucene.util.NumericUtils;
import org.apache.lucene.xmlparser.DOMUtils;
import org.apache.lucene.xmlparser.FilterBuilder;
import org.apache.lucene.xmlparser.ParserException;
import org.w3c.dom.Element;
/**
* Creates a {@link NumericRangeFilter}. The table below specifies the required
* attributes and the defaults if optional attributes are omitted. For more
* detail on what each of the attributes actually do, consult the documentation
* for {@link NumericRangeFilter}:
* <table>
* <tr>
* <th>Attribute name
* <th>Values
* <th>Required
* <th>Default
* </tr>
* <tr>
* <td>fieldName |
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