content: /*
   * 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 com.datastax.oss.driver.internal.mapper.processor.entity;
  
  import com.datastax.oss.driver.api.mapper.MapperException;
  import com.datastax.oss.driver.api.querybuilder.QueryBuilder;
  import com.datastax.oss.driver.api.querybuilder.delete.Delete;
  import com.datastax.oss.driver.api.querybuilder.delete.DeleteSelection;
  import com.datastax.oss.driver.internal.mapper.processor.MethodGenerator;
  import com.squareup.javapoet.MethodSpec;
  import com.squareup.javapoet.TypeName;
  import java.util.Optional;
  import javax.lang.model.element.Modifier;
  
  public class EntityHelperDeleteByPrimaryKeyPartsMethodGenerator implements MethodGenerator {
  
    private final EntityDefinition entityDefinition;
  
    public EntityHelperDeleteByPrimaryKeyPartsMethodGenerator(EntityDefinition entityDefinition) {
      this.entityDefinition = entityDefinition;
    }
  
    @Override
    public Optional<MethodSpec> generate() {
      MethodSpec.Builder deleteByPrimaryKeyPartsBuilder =
          MethodSpec.methodBuilder("deleteByPrimaryKeyParts")
              .addModifiers(Modifier.PUBLIC)
              .addParameter(TypeName.INT, "parameterCount")
              .returns(Delete.class);
  
      if (entityDefinition.getPrimaryKey().isEmpty()) {
        deleteByPrimaryKeyPartsBuilder.addStatement(
            "throw new $T($S)",
            MapperException.class,
            String.format(
                "Entity %s does not declare a primary key",
                entityDefinition.getClassName().simpleName()));
      } else {
        deleteByPrimaryKeyPartsBuilder.beginControlFlow("if (parameterCount <= 0)");
        deleteByPrimaryKeyPartsBuilder.addStatement(
            "throw new $T($S)", MapperException.class, "parameterCount must be greater than 0");
        deleteByPrimaryKeyPartsBuilder.endControlFlow();
  
        deleteByPrimaryKeyPartsBuilder.addStatement(
            "$1T deleteSelection = deleteStart()", DeleteSelection.class);
  
        deleteByPrimaryKeyPartsBuilder.addStatement(
            "$1T columnName = primaryKeys.get(0)", String.class);
        deleteByPrimaryKeyPartsBuilder.addStatement(
            "$1T delete = deleteSelection.whereColumn(columnName).isEqualTo($2T.bindMarker"
                + "(columnName))",
            Delete.class,
            QueryBuilder.class);
        deleteByPrimaryKeyPartsBuilder.beginControlFlow(
            "for (int i = 1; i < parameterCount && i < " + "primaryKeys.size(); i++)");
        deleteByPrimaryKeyPartsBuilder.addStatement("columnName = primaryKeys.get(i)");
        deleteByPrimaryKeyPartsBuilder.addStatement(
            "delete = delete.whereColumn(columnName).isEqualTo($1T.bindMarker(columnName))",
            QueryBuilder.class);
        deleteByPrimaryKeyPartsBuilder.endControlFlow();
        deleteByPrimaryKeyPartsBuilder.addStatement("return delete");
      }
      return Optional.of(deleteByPrimaryKeyPartsBuilder.build());
    }
  }
  