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GAPIC generator Java
There is a newer version: 2.45.0
// 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.api.generator.engine.lexicon.InvalidSymbol;
import com.google.api.generator.engine.lexicon.Keyword;
import com.google.api.generator.engine.lexicon.Literal;
import com.google.api.generator.engine.lexicon.Operator;
import com.google.api.generator.engine.lexicon.Separator;
import com.google.auto.value.AutoValue;
import com.google.common.base.Preconditions;
import java.util.regex.Pattern;

@AutoValue
public abstract class IdentifierNode implements AstNode {
  static class InvalidIdentifierException extends RuntimeException {
    public InvalidIdentifierException(String errorMessage) {
      super(errorMessage);
    }
  }

  private static final Pattern NUMERIC_PATTERN = Pattern.compile("^[0-9]");

  public abstract String name();

  public static IdentifierNode withName(String name) {
    return builder().setName(name).build();
  }

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

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

  @Override
  public String toString() {
    return name();
  }

  @AutoValue.Builder
  public abstract static class Builder {
    public abstract Builder setName(String name);

    abstract IdentifierNode autoBuild();

    public IdentifierNode buildVariableIdentifier() throws InvalidIdentifierException {
      return build(/* isField= */ true);
    }

    public IdentifierNode build() throws InvalidIdentifierException {
      return build(/* isField= */ false);
    }

    // Private.
    IdentifierNode build(boolean isField) throws InvalidIdentifierException {
      IdentifierNode identifier = autoBuild();
      String identifierName = identifier.name();
      Preconditions.checkNotNull(identifierName);

      if (identifierName.isEmpty()) {
        throw new InvalidIdentifierException("Name cannot be empty.");
      }

      if (NUMERIC_PATTERN.matcher(identifierName.substring(0, 1)).matches()) {
        throw new InvalidIdentifierException("Name cannot begin with a number.");
      }

      if (Literal.isLiteral(identifierName)) {
        throw new InvalidIdentifierException(
            String.format("Name %s cannot be a literal", identifierName));
      }

      if (InvalidSymbol.containsInvalidSymbol(identifierName)
          || Operator.containsOperator(identifierName)
          || Separator.containsSeparator(identifierName)) {
        throw new InvalidIdentifierException(
            String.format("Name %s cannot contain non-alphanumeric characters", identifierName));
      }

      if (isField) {
        if (Keyword.isInvalidFieldName(identifierName)) {
          throw new InvalidIdentifierException(
              String.format("Name %s cannot be a keyword.", identifierName));
        }

      } else {
        if (Keyword.isKeyword(identifierName)) {
          throw new InvalidIdentifierException(
              String.format("Name %s cannot be a keyword.", identifierName));
        }
      }

      return identifier;
    }
  }
}