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A universal transaction manager that achieves database-agnostic transactions and distributed transactions that span multiple databases

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package com.scalar.db.api;

import static com.google.common.base.Preconditions.checkNotNull;

import com.scalar.db.api.OperationBuilder.ClearClusteringKey;
import com.scalar.db.api.OperationBuilder.ClearCondition;
import com.scalar.db.api.OperationBuilder.ClearNamespace;
import com.scalar.db.api.OperationBuilder.ClusteringKey;
import com.scalar.db.api.OperationBuilder.Condition;
import com.scalar.db.api.OperationBuilder.Consistency;
import com.scalar.db.api.OperationBuilder.PartitionKeyBuilder;
import com.scalar.db.api.OperationBuilder.TableBuilder;
import com.scalar.db.io.Key;
import javax.annotation.Nullable;

public class DeleteBuilder {

  public static class Namespace
      implements OperationBuilder.Namespace, OperationBuilder.Table {

    Namespace() {}

    @Override
    public Table namespace(String namespaceName) {
      checkNotNull(namespaceName);
      return new Table(namespaceName);
    }

    @Override
    public PartitionKey table(String tableName) {
      checkNotNull(tableName);
      return new PartitionKey(null, tableName);
    }
  }

  public static class Table extends TableBuilder {

    private Table(String namespaceName) {
      super(namespaceName);
    }

    @Override
    public PartitionKey table(String tableName) {
      checkNotNull(tableName);
      return new PartitionKey(namespace, tableName);
    }
  }

  public static class PartitionKey extends PartitionKeyBuilder {

    private PartitionKey(@Nullable String namespace, String table) {
      super(namespace, table);
    }

    @Override
    public Buildable partitionKey(Key partitionKey) {
      checkNotNull(partitionKey);
      return new Buildable(namespaceName, tableName, partitionKey);
    }
  }

  public static class Buildable extends OperationBuilder.Buildable
      implements ClusteringKey, Consistency, Condition {
    @Nullable Key clusteringKey;
    @Nullable com.scalar.db.api.Consistency consistency;
    @Nullable MutationCondition condition;

    private Buildable(@Nullable String namespace, String table, Key partitionKey) {
      super(namespace, table, partitionKey);
    }

    @Override
    public Buildable clusteringKey(Key clusteringKey) {
      checkNotNull(clusteringKey);
      this.clusteringKey = clusteringKey;
      return this;
    }

    @Override
    public Buildable condition(MutationCondition condition) {
      checkNotNull(condition);
      this.condition = condition;
      return this;
    }

    @Override
    public Buildable consistency(com.scalar.db.api.Consistency consistency) {
      checkNotNull(consistency);
      this.consistency = consistency;
      return this;
    }

    @Override
    public Delete build() {
      Delete delete = new Delete(partitionKey, clusteringKey);
      delete.forNamespace(namespaceName).forTable(tableName);
      if (condition != null) {
        delete.withCondition(condition);
      }
      if (consistency != null) {
        delete.withConsistency(consistency);
      }

      return delete;
    }
  }

  public static class BuildableFromExisting extends Buildable
      implements OperationBuilder.Namespace,
          OperationBuilder.Table,
          OperationBuilder.PartitionKey,
          ClearCondition,
          ClearClusteringKey,
          ClearNamespace {

    BuildableFromExisting(Delete delete) {
      super(
          delete.forNamespace().orElse(null),
          delete.forTable().orElse(null),
          delete.getPartitionKey());

      this.clusteringKey = delete.getClusteringKey().orElse(null);
      this.consistency = delete.getConsistency();
      this.condition = delete.getCondition().orElse(null);
    }

    @Override
    public BuildableFromExisting namespace(String namespaceName) {
      checkNotNull(namespaceName);
      this.namespaceName = namespaceName;
      return this;
    }

    @Override
    public BuildableFromExisting table(String tableName) {
      checkNotNull(tableName);
      this.tableName = tableName;
      return this;
    }

    @Override
    public BuildableFromExisting partitionKey(Key partitionKey) {
      checkNotNull(partitionKey);
      this.partitionKey = partitionKey;
      return this;
    }

    @Override
    public BuildableFromExisting clusteringKey(Key clusteringKey) {
      super.clusteringKey(clusteringKey);
      return this;
    }

    @Override
    public BuildableFromExisting consistency(com.scalar.db.api.Consistency consistency) {
      super.consistency(consistency);
      return this;
    }

    @Override
    public BuildableFromExisting condition(MutationCondition condition) {
      super.condition(condition);
      return this;
    }

    @Override
    public BuildableFromExisting clearCondition() {
      this.condition = null;
      return this;
    }

    @Override
    public BuildableFromExisting clearClusteringKey() {
      this.clusteringKey = null;
      return this;
    }

    @Override
    public BuildableFromExisting clearNamespace() {
      this.namespaceName = null;
      return this;
    }
  }
}
    

    

    

            

    

            



    
    






    
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