| /* |
| * 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; |
| |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import com.google.common.base.Preconditions; |
| import org.apache.druid.java.util.common.IAE; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.Set; |
| |
| /** |
| * Represents a lookup. |
| * |
| * Currently, this datasource is not actually queryable, and attempts to do so will lead to errors. It is here as a |
| * placeholder for a future time in which it will become queryable. |
| * |
| * The "lookupName" referred to here should be provided by a |
| * {@link org.apache.druid.query.lookup.LookupExtractorFactoryContainerProvider}. |
| */ |
| public class LookupDataSource implements DataSource |
| { |
| private final String lookupName; |
| |
| @JsonCreator |
| public LookupDataSource( |
| @JsonProperty("lookup") String lookupName |
| ) |
| { |
| this.lookupName = Preconditions.checkNotNull(lookupName, "lookup"); |
| } |
| |
| @Override |
| public Set<String> getTableNames() |
| { |
| return Collections.emptySet(); |
| } |
| |
| @JsonProperty("lookup") |
| public String getLookupName() |
| { |
| return lookupName; |
| } |
| |
| @Override |
| public List<DataSource> getChildren() |
| { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public DataSource withChildren(List<DataSource> children) |
| { |
| if (!children.isEmpty()) { |
| throw new IAE("Cannot accept children"); |
| } |
| |
| return this; |
| } |
| |
| @Override |
| public boolean isCacheable(boolean isBroker) |
| { |
| return false; |
| } |
| |
| @Override |
| public boolean isGlobal() |
| { |
| return true; |
| } |
| |
| @Override |
| public boolean isConcrete() |
| { |
| return true; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| LookupDataSource that = (LookupDataSource) o; |
| return Objects.equals(lookupName, that.lookupName); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hash(lookupName); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "LookupDataSource{" + |
| "lookupName='" + lookupName + '\'' + |
| '}'; |
| } |
| } |