| package org.apache.lucene.search.function; |
| |
| /** |
| * 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.AtomicReaderContext; |
| import org.apache.lucene.index.values.IndexDocValues; |
| import org.apache.lucene.index.values.ValueType; |
| |
| /** |
| * Expert: obtains numeric field values from a {@link IndexDocValues} field. |
| * This {@link ValueSource} is compatible with all numerical |
| * {@link IndexDocValues} |
| * |
| * @lucene.experimental |
| * |
| */ |
| public class NumericIndexDocValueSource extends ValueSource { |
| |
| private final String field; |
| |
| public NumericIndexDocValueSource(String field) { |
| this.field = field; |
| } |
| |
| @Override |
| public DocValues getValues(AtomicReaderContext context) throws IOException { |
| final IndexDocValues.Source source = context.reader.docValues(field) |
| .getSource(); |
| ValueType type = source.type(); |
| switch (type) { |
| case FLOAT_32: |
| case FLOAT_64: |
| return new DocValues() { |
| |
| @Override |
| public String toString(int doc) { |
| return "float: [" + floatVal(doc) + "]"; |
| } |
| |
| @Override |
| public float floatVal(int doc) { |
| return (float) source.getFloat(doc); |
| } |
| }; |
| |
| case INTS: |
| return new DocValues() { |
| @Override |
| public String toString(int doc) { |
| return "float: [" + floatVal(doc) + "]"; |
| } |
| |
| @Override |
| public float floatVal(int doc) { |
| return (float) source.getInt(doc); |
| } |
| }; |
| default: |
| throw new IOException("Type: " + type + "is not numeric"); |
| } |
| |
| } |
| |
| @Override |
| public String description() { |
| return toString(); |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((field == null) ? 0 : field.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| NumericIndexDocValueSource other = (NumericIndexDocValueSource) obj; |
| if (field == null) { |
| if (other.field != null) |
| return false; |
| } else if (!field.equals(other.field)) |
| return false; |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return "DocValues float(" + field + ')'; |
| } |
| } |