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[FLINK-12711][table] Separate function implementation and definition
This closes apache#8661.
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89
...able-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinition.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.table.functions; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.util.Preconditions; | ||
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| /** | ||
| * Definition of a built-in function. It enables unique identification across different | ||
| * modules by reference equality. | ||
| * | ||
| * <p>Compared to regular {@link FunctionDefinition}, built-in functions have a default name. | ||
| * | ||
| * <p>Equality is defined by reference equality. | ||
| */ | ||
| @Internal | ||
| public final class BuiltInFunctionDefinition implements FunctionDefinition { | ||
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| private final String name; | ||
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| private final FunctionKind kind; | ||
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| private BuiltInFunctionDefinition( | ||
| String name, | ||
| FunctionKind kind) { | ||
| this.name = Preconditions.checkNotNull(name, "Name must not be null."); | ||
| this.kind = Preconditions.checkNotNull(kind, "Kind must not be null."); | ||
| } | ||
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| public String getName() { | ||
| return name; | ||
| } | ||
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| @Override | ||
| public FunctionKind getKind() { | ||
| return kind; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return name; | ||
| } | ||
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| // -------------------------------------------------------------------------------------------- | ||
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| /** | ||
| * Builder for fluent definition of built-in functions. | ||
| */ | ||
| public static class Builder { | ||
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| private String name; | ||
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| private FunctionKind kind; | ||
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| public Builder() { | ||
| // default constructor to allow a fluent definition | ||
| } | ||
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| public Builder name(String name) { | ||
| this.name = name; | ||
| return this; | ||
| } | ||
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| public Builder kind(FunctionKind kind) { | ||
| this.kind = kind; | ||
| return this; | ||
| } | ||
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| public BuiltInFunctionDefinition build() { | ||
| return new BuiltInFunctionDefinition(name, kind); | ||
| } | ||
| } | ||
| } |
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