| /* |
| * 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.druid.query.extraction; |
| |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import org.apache.druid.java.util.common.StringUtils; |
| |
| import javax.annotation.Nullable; |
| import java.nio.ByteBuffer; |
| |
| public class BucketExtractionFn implements ExtractionFn |
| { |
| |
| private final double size; |
| private final double offset; |
| |
| @JsonCreator |
| public BucketExtractionFn( |
| @JsonProperty("size") @Nullable Double size, |
| @JsonProperty("offset") @Nullable Double offset |
| ) |
| { |
| this.size = size == null ? 1 : size; |
| this.offset = offset == null ? 0 : offset; |
| } |
| |
| @JsonProperty |
| public double getSize() |
| { |
| return size; |
| } |
| |
| @JsonProperty |
| public double getOffset() |
| { |
| return offset; |
| } |
| |
| @Override |
| @Nullable |
| public String apply(@Nullable Object value) |
| { |
| if (value == null) { |
| return null; |
| } |
| |
| if (value instanceof Number) { |
| return bucket(((Number) value).doubleValue()); |
| } else if (value instanceof String) { |
| return apply((String) value); |
| } |
| return null; |
| } |
| |
| @Override |
| @Nullable |
| public String apply(@Nullable String value) |
| { |
| if (value == null) { |
| return null; |
| } |
| |
| try { |
| return bucket(Double.parseDouble(value)); |
| } |
| catch (NumberFormatException | NullPointerException ex) { |
| return null; |
| } |
| } |
| |
| @Override |
| public String apply(long value) |
| { |
| return bucket(value); |
| } |
| |
| private String bucket(double value) |
| { |
| double ret = Math.floor((value - offset) / size) * size + offset; |
| return ret == (long) ret ? String.valueOf((long) ret) : String.valueOf(ret); |
| } |
| |
| @Override |
| public boolean preservesOrdering() |
| { |
| return false; |
| } |
| |
| @Override |
| public ExtractionType getExtractionType() |
| { |
| return ExtractionType.MANY_TO_ONE; |
| } |
| |
| @Override |
| public byte[] getCacheKey() |
| { |
| return ByteBuffer.allocate(1 + 2 * Double.BYTES) |
| .put(ExtractionCacheHelper.CACHE_TYPE_ID_BUCKET) |
| .putDouble(size) |
| .putDouble(offset) |
| .array(); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| BucketExtractionFn that = (BucketExtractionFn) o; |
| |
| if (Double.compare(that.size, size) != 0) { |
| return false; |
| } |
| return Double.compare(that.offset, offset) == 0; |
| |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| int result; |
| long temp; |
| temp = Double.doubleToLongBits(size); |
| result = (int) (temp ^ (temp >>> 32)); |
| temp = Double.doubleToLongBits(offset); |
| result = 31 * result + (int) (temp ^ (temp >>> 32)); |
| return result; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return StringUtils.format("bucket(%f, %f)", size, offset); |
| } |
| } |