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.querybuilder.schema;
  
  import com.datastax.oss.driver.api.core.CqlIdentifier;
  import com.datastax.oss.driver.api.core.type.DataType;
  import com.datastax.oss.driver.api.querybuilder.BuildableQuery;
  import com.datastax.oss.driver.api.querybuilder.schema.AlterTypeRenameField;
  import com.datastax.oss.driver.api.querybuilder.schema.AlterTypeRenameFieldEnd;
  import com.datastax.oss.driver.api.querybuilder.schema.AlterTypeStart;
  import com.datastax.oss.driver.internal.querybuilder.CqlHelper;
  import com.datastax.oss.driver.internal.querybuilder.ImmutableCollections;
  import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableMap;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import java.util.Map;
  import net.jcip.annotations.Immutable;
  
  @Immutable
  public class DefaultAlterType
      implements AlterTypeStart, AlterTypeRenameField, AlterTypeRenameFieldEnd, BuildableQuery {
  
    private final CqlIdentifier keyspace;
    private final CqlIdentifier typeName;
  
    private final CqlIdentifier fieldToAdd;
    private final DataType fieldToAddType;
  
    private final ImmutableMap<CqlIdentifier, CqlIdentifier> fieldsToRename;
  
    private final CqlIdentifier fieldToAlter;
    private final DataType fieldToAlterType;
  
    public DefaultAlterType(@NonNull CqlIdentifier typeName) {
      this(null, typeName);
    }
  
    public DefaultAlterType(@Nullable CqlIdentifier keyspace, @NonNull CqlIdentifier typeName) {
      this(keyspace, typeName, null, null, ImmutableMap.of(), null, null);
    }
  
    public DefaultAlterType(
        @Nullable CqlIdentifier keyspace,
        @NonNull CqlIdentifier typeName,
        @Nullable CqlIdentifier fieldToAdd,
        @Nullable DataType fieldToAddType,
        @NonNull ImmutableMap<CqlIdentifier, CqlIdentifier> fieldsToRename,
        @Nullable CqlIdentifier fieldToAlter,
        @Nullable DataType fieldToAlterType) {
      this.keyspace = keyspace;
      this.typeName = typeName;
      this.fieldToAdd = fieldToAdd;
      this.fieldToAddType = fieldToAddType;
      this.fieldsToRename = fieldsToRename;
      this.fieldToAlter = fieldToAlter;
      this.fieldToAlterType = fieldToAlterType;
    }
  
    @NonNull
    @Override
    public BuildableQuery alterField(@NonNull CqlIdentifier fieldName, @NonNull DataType dataType) {
      return new DefaultAlterType(
          keyspace, typeName, fieldToAdd, fieldToAddType, fieldsToRename, fieldName, dataType);
    }
  
    @NonNull
    @Override
    public BuildableQuery addField(@NonNull CqlIdentifier fieldName, @NonNull DataType dataType) {
      return new DefaultAlterType(
          keyspace, typeName, fieldName, dataType, fieldsToRename, fieldToAlter, fieldToAlterType);
    }
  
    @NonNull
    @Override
    public AlterTypeRenameFieldEnd renameField(
        @NonNull CqlIdentifier from, @NonNull CqlIdentifier to) {
      return new DefaultAlterType(
          keyspace,
          typeName,
          fieldToAdd,
          fieldToAddType,
          ImmutableCollections.append(fieldsToRename, from, to),
          fieldToAlter,
          fieldToAlterType);
    }
  
    @NonNull
    @Override
    public String asCql() {
      StringBuilder builder = new StringBuilder("ALTER TYPE ");
  
      CqlHelper.qualify(keyspace, typeName, builder);
  
      if (fieldToAlter != null) {
        return builder
            .append(" ALTER ")
            .append(fieldToAlter.asCql(true))
            .append(" TYPE ")
            .append(fieldToAlterType.asCql(true, true))
            .toString();
      } else if (fieldToAdd != null) {
        return builder
            .append(" ADD ")
            .append(fieldToAdd.asCql(true))
            .append(" ")
            .append(fieldToAddType.asCql(true, true))
            .toString();
      } else if (!fieldsToRename.isEmpty()) {
        builder.append(" RENAME ");
        boolean first = true;
        for (Map.Entry<CqlIdentifier, CqlIdentifier> entry : fieldsToRename.entrySet()) {
          if (first) {
            first = false;
          } else {
            builder.append(" AND ");
          }
          builder
              .append(entry.getKey().asCql(true))
              .append(" TO ")
              .append(entry.getValue().asCql(true));
        }
        return builder.toString();
      }
  
      // While this is incomplete, we should return partially built query at this point for toString
      // purposes.
      return builder.toString();
    }
  
    @Override
    public String toString() {
      return asCql();
    }
  
    @Nullable
    public CqlIdentifier getKeyspace() {
      return keyspace;
    }
  
    @NonNull
    public CqlIdentifier getType() {
      return typeName;
    }
  
    @Nullable
    public CqlIdentifier getFieldToAdd() {
      return fieldToAdd;
    }
  
    @Nullable
    public DataType getFieldToAddType() {
      return fieldToAddType;
    }
  
    @NonNull
    public ImmutableMap<CqlIdentifier, CqlIdentifier> getFieldsToRename() {
      return fieldsToRename;
    }
  
    @Nullable
    public CqlIdentifier getFieldToAlter() {
      return fieldToAlter;
    }
  
    @Nullable
    public DataType getFieldToAlterType() {
      return fieldToAlterType;
    }
  }
  