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Merge pull request #259 from jeffgbutler/aggregates-are-functions
Refactor Aggregates to Behave Like Functions
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46 changes: 46 additions & 0 deletions
46
src/main/java/org/mybatis/dynamic/sql/select/aggregate/AbstractCount.java
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/* | ||
* Copyright 2016-2020 the original author or authors. | ||
* | ||
* Licensed 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.mybatis.dynamic.sql.select.aggregate; | ||
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import java.util.Optional; | ||
import org.mybatis.dynamic.sql.BindableColumn; | ||
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/** | ||
* Count functions are implemented differently than the other aggregates. This is primarily to preserve | ||
* backwards compatibility. Count functions are configured as BindableColumns of type Long | ||
* as it is assumed that the count functions always return a number. | ||
* | ||
* @param <T> the subtype of this class | ||
*/ | ||
public abstract class AbstractCount<T extends AbstractCount<T>> implements BindableColumn<Long> { | ||
private final String alias; | ||
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protected AbstractCount(String alias) { | ||
this.alias = alias; | ||
} | ||
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@Override | ||
public Optional<String> alias() { | ||
return Optional.ofNullable(alias); | ||
} | ||
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@Override | ||
public T as(String alias) { | ||
return copyWithAlias(alias); | ||
} | ||
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protected abstract T copyWithAlias(String alias); | ||
} |
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