/*
* 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.
*/
package org.apache.lucene.facet.taxonomy;
import java.util.Arrays;
import org.apache.lucene.document.Document;
import org.apache.lucene.util.BytesRef;
/** Add an instance of this to your {@link Document} to add
* a facet label associated with an int. Use {@link
* TaxonomyFacetSumIntAssociations} to aggregate int values
* per facet label at search time.
*
* @lucene.experimental */
public class IntAssociationFacetField extends AssociationFacetField {
/** Creates this from {@code dim} and {@code path} and an
* int association */
public IntAssociationFacetField(int assoc, String dim, String... path) {
super(intToBytesRef(assoc), dim, path);
}
/** Encodes an {@code int} as a 4-byte {@link BytesRef},
* big-endian. */
public static BytesRef intToBytesRef(int v) {
byte[] bytes = new byte[4];
// big-endian:
bytes[0] = (byte) (v >> 24);
bytes[1] = (byte) (v >> 16);
bytes[2] = (byte) (v >> 8);
bytes[3] = (byte) v;
return new BytesRef(bytes);
}
/** Decodes a previously encoded {@code int}. */
public static int bytesRefToInt(BytesRef b) {
return ((b.bytes[b.offset]&0xFF) << 24) |
((b.bytes[b.offset+1]&0xFF) << 16) |
((b.bytes[b.offset+2]&0xFF) << 8) |
(b.bytes[b.offset+3]&0xFF);
}
@Override
public String toString() {
return "IntAssociationFacetField(dim=" + dim + " path=" + Arrays.toString(path) + " value=" + bytesRefToInt(assoc) + ")";
}
}