io.druid.query.extraction.StrlenExtractionFn Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.query.extraction;
import com.fasterxml.jackson.annotation.JsonCreator;
import javax.annotation.Nullable;
public class StrlenExtractionFn extends DimExtractionFn
{
private static final StrlenExtractionFn INSTANCE = new StrlenExtractionFn();
private StrlenExtractionFn()
{
}
@JsonCreator
public static StrlenExtractionFn instance()
{
return INSTANCE;
}
@Override
public String apply(@Nullable String value)
{
return String.valueOf(value == null ? 0 : value.length());
}
@Override
public boolean preservesOrdering()
{
return false;
}
@Override
public ExtractionType getExtractionType()
{
return ExtractionType.MANY_TO_ONE;
}
@Override
public byte[] getCacheKey()
{
return new byte[]{ExtractionCacheHelper.CACHE_TYPE_ID_STRLEN};
}
}