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 org.apache.asterix.lang.common.statement;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.stream.Collectors;
  
  import org.apache.asterix.common.config.DatasetConfig.IndexType;
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.common.metadata.DataverseName;
  import org.apache.asterix.common.metadata.Namespace;
  import org.apache.asterix.lang.common.base.AbstractStatement;
  import org.apache.asterix.lang.common.base.Statement;
  import org.apache.asterix.lang.common.expression.IndexedTypeExpression;
  import org.apache.asterix.lang.common.struct.Identifier;
  import org.apache.asterix.lang.common.visitor.base.ILangVisitor;
  import org.apache.hyracks.algebricks.common.utils.Pair;
  import org.apache.hyracks.algebricks.common.utils.Triple;
  import org.apache.hyracks.api.exceptions.SourceLocation;
  import org.apache.hyracks.util.OptionalBoolean;
  
  public class CreateIndexStatement extends AbstractStatement {
  
      private final Namespace namespace;
      private final Identifier datasetName;
      private final Identifier indexName;
      private final IndexType indexType;
      private final List<IndexedElement> indexedElements;
      private final boolean enforced;
      private final boolean ifNotExists;
      // Specific to NGram indexes.
      private final int gramLength;
      // Specific to FullText indexes.
      private final String fullTextConfigName;
      private final OptionalBoolean excludeUnknownKey;
      private final OptionalBoolean castDefaultNull;
      private final Map<String, String> castConfig;
  
      public CreateIndexStatement(Namespace namespace, Identifier datasetName, Identifier indexName, IndexType indexType,
              List<IndexedElement> indexedElements, boolean enforced, int gramLength, String fullTextConfigName,
              boolean ifNotExists, Boolean excludeUnknownKey, Boolean castDefaultNull, Map<String, String> castConfig) {
          this.namespace = namespace;
          this.datasetName = Objects.requireNonNull(datasetName);
          this.indexName = Objects.requireNonNull(indexName);
          this.indexType = Objects.requireNonNull(indexType);
          this.indexedElements = Objects.requireNonNull(indexedElements);
          this.enforced = enforced;
          this.gramLength = gramLength;
          this.ifNotExists = ifNotExists;
          this.fullTextConfigName = fullTextConfigName;
          this.excludeUnknownKey = OptionalBoolean.ofNullable(excludeUnknownKey);
          this.castDefaultNull = OptionalBoolean.ofNullable(castDefaultNull);
          this.castConfig = castConfig == null ? Collections.emptyMap() : castConfig;
      }
  
      public String getFullTextConfigName() {
          return fullTextConfigName;
      }
  
      public Namespace getNamespace() {
          return namespace;
      }
  
      public DataverseName getDataverseName() {
          return namespace == null ? null : namespace.getDataverseName();
      }
  
      public Identifier getDatasetName() {
          return datasetName;
      }
  
      public Identifier getIndexName() {
          return indexName;
      }
  
      public IndexType getIndexType() {
          return indexType;
      }
  
      public List<IndexedElement> getIndexedElements() {
          return indexedElements;
      }
  
      public boolean isEnforced() {
          return enforced;
      }
  
      public boolean hasExcludeUnknownKey() {
          return excludeUnknownKey.isPresent();
      }
  
      public OptionalBoolean getExcludeUnknownKey() {
          return excludeUnknownKey;
      }
  
      public boolean hasCastDefaultNull() {
          return castDefaultNull.isPresent();
      }
  
      public OptionalBoolean getCastDefaultNull() {
          return castDefaultNull;
      }
  
      public int getGramLength() {
          return gramLength;
      }
  
      public boolean getIfNotExists() {
          return this.ifNotExists;
      }
  
      public Map<String, String> getCastConfig() {
          return castConfig;
      }
  
      @Override
      public Kind getKind() {
          return Statement.Kind.CREATE_INDEX;
      }
  
      @Override
      public <R, T> R accept(ILangVisitor<R, T> visitor, T arg) throws CompilationException {
          return visitor.visit(this, arg);
      }
  
      @Override
      public byte getCategory() {
          return Category.DDL;
      }
  
      public static final class IndexedElement {
  
          private final int sourceIndicator;
  
          private final List<List<String>> unnestList;
  
          private final List<Pair<List<String>, IndexedTypeExpression>> projectList;
  
          private SourceLocation sourceLoc;
  
          public IndexedElement(int sourceIndicator, List<List<String>> unnestList,
                  List<Pair<List<String>, IndexedTypeExpression>> projectList) {
              if (Objects.requireNonNull(projectList).isEmpty()) {
                  throw new IllegalArgumentException();
              }
              this.sourceIndicator = sourceIndicator;
              this.unnestList = unnestList != null ? unnestList : Collections.emptyList();
              this.projectList = projectList;
          }
  
          public int getSourceIndicator() {
              return sourceIndicator;
          }
  
          public boolean hasUnnest() {
              return !unnestList.isEmpty();
          }
  
          public List<List<String>> getUnnestList() {
              return unnestList;
          }
  
          public List<Pair<List<String>, IndexedTypeExpression>> getProjectList() {
              return projectList;
          }
  
          public Triple<Integer, List<List<String>>, List<List<String>>> toIdentifier() {
              List<List<String>> newProjectList = projectList.stream().map(Pair::getFirst).collect(Collectors.toList());
              return new Triple<>(sourceIndicator, unnestList, newProjectList);
          }
  
          public SourceLocation getSourceLocation() {
              return sourceLoc;
          }
  
          public void setSourceLocation(SourceLocation sourceLoc) {
              this.sourceLoc = sourceLoc;
          }
  
          public String getProjectListDisplayForm() {
              return projectList.stream().map(Pair::getFirst).map(String::valueOf).collect(Collectors.joining(", "));
          }
      }
  }
  