| /* |
| * 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.segment; |
| |
| /** |
| * This class is convenient for implementation of "object-sourcing" {@link ColumnValueSelector}s, it provides default |
| * implementations for all {@link ColumnValueSelector}'s methods except {@link #getObject()} and {@link |
| * #classOfObject()}. |
| * |
| * This class should appear ONLY in "extends" clause or anonymous class creation, but NOT in "user" code, where |
| * {@link BaseObjectColumnValueSelector} must be used instead. |
| * |
| * This is a class rather than an interface unlike {@link LongColumnSelector}, {@link FloatColumnSelector} and {@link |
| * DoubleColumnSelector} solely in order to make {@link #isNull()} method final. |
| */ |
| public abstract class ObjectColumnSelector<T> implements ColumnValueSelector<T> |
| { |
| /** |
| * @deprecated This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental |
| * calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on {@link ColumnValueSelector} |
| * objects. |
| */ |
| @Deprecated |
| @Override |
| public float getFloat() |
| { |
| T value = getObject(); |
| if (value == null) { |
| return 0; |
| } |
| return ((Number) value).floatValue(); |
| } |
| |
| /** |
| * @deprecated This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental |
| * calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on {@link ColumnValueSelector} |
| * objects. |
| */ |
| @Deprecated |
| @Override |
| public double getDouble() |
| { |
| T value = getObject(); |
| if (value == null) { |
| return 0; |
| } |
| return ((Number) value).doubleValue(); |
| } |
| |
| /** |
| * @deprecated This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental |
| * calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on {@link ColumnValueSelector} |
| * objects. |
| */ |
| @Deprecated |
| @Override |
| public long getLong() |
| { |
| T value = getObject(); |
| if (value == null) { |
| return 0; |
| } |
| return ((Number) value).longValue(); |
| } |
| |
| /** |
| * @deprecated This method is marked as deprecated in ObjectColumnSelector since it always returns false. |
| * There is no need to call this method. |
| */ |
| @Deprecated |
| @Override |
| public final boolean isNull() |
| { |
| return false; |
| } |
| } |