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GAPIC generator Java

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// Copyright 2020 Google LLC
//
// 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 com.google.api.generator.engine.ast;

import com.google.auto.value.AutoValue;
import com.google.common.base.Preconditions;

@AutoValue
public abstract class EnumRefExpr implements Expr {
  public abstract IdentifierNode identifier();

  @Override
  public abstract TypeNode type();

  @Override
  public void accept(AstNodeVisitor visitor) {
    visitor.visit(this);
  }

  abstract String name();

  public static Builder builder() {
    return new AutoValue_EnumRefExpr.Builder();
  }

  @AutoValue.Builder
  public abstract static class Builder {
    public abstract Builder setType(TypeNode type);

    public abstract Builder setName(String name);

    abstract String name();

    abstract Builder setIdentifier(IdentifierNode identifier);

    abstract EnumRefExpr autoBuild();

    public EnumRefExpr build() {
      setIdentifier(IdentifierNode.builder().setName(name()).build());
      EnumRefExpr enumRefExpr = autoBuild();
      Preconditions.checkState(
          TypeNode.isReferenceType(enumRefExpr.type()),
          "Enum reference type must be a reference type");
      return enumRefExpr;
    }
  }
}