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.cassandra.cql3.restrictions;
  
  import java.util.Objects;
  
  import org.apache.cassandra.cql3.*;
  import org.apache.cassandra.cql3.terms.Term;
  import org.apache.cassandra.db.filter.RowFilter;
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.index.Index;
  import org.apache.cassandra.schema.TableMetadata;
  
  public class CustomIndexExpression
  {
      private final ColumnIdentifier valueColId = new ColumnIdentifier("custom index expression", false);
  
      public final QualifiedName targetIndex;
      public final Term.Raw valueRaw;
  
      private Term value;
  
      public CustomIndexExpression(QualifiedName targetIndex, Term.Raw value)
      {
          this.targetIndex = targetIndex;
          this.valueRaw = value;
      }
  
      public void prepareValue(TableMetadata table, AbstractType<?> expressionType, VariableSpecifications boundNames)
      {
          ColumnSpecification spec = new ColumnSpecification(table.keyspace, table.keyspace, valueColId, expressionType);
          value = valueRaw.prepare(table.keyspace, spec);
          value.collectMarkerSpecification(boundNames);
      }
  
      public void addToRowFilter(RowFilter filter, TableMetadata table, QueryOptions options)
      {
          filter.addCustomIndexExpression(table,
                                          table.indexes
                                               .get(targetIndex.getName())
                                               .orElseThrow(() -> IndexRestrictions.indexNotFound(targetIndex, table)),
                                          value.bindAndGet(options));
      }
  
      /**
       * Returns whether this expression would need filtering if the specified index group were used.
       *
       * @param indexGroup an index group
       * @return {@code true} if this would need filtering if {@code indexGroup} were used, {@code false} otherwise
       */
      public boolean needsFiltering(Index.Group indexGroup)
      {
          String indexName = targetIndex.getName();
          for (Index index : indexGroup.getIndexes())
          {
              if (index.getIndexMetadata().name.equals(indexName))
                  return false;
          }
          return true;
      }
  
      public String toCQLString()
      {
          return String.format("expr(%s,%s)", targetIndex.toCQLString(), valueRaw.getText());
      }
  
      @Override
      public String toString()
      {
          return toCQLString();
      }
  
      @Override
      public int hashCode()
      {
          return Objects.hash(targetIndex, valueRaw);
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o)
              return true;
  
          if (!(o instanceof CustomIndexExpression))
              return false;
  
          CustomIndexExpression cie = (CustomIndexExpression) o;
          return targetIndex.equals(cie.targetIndex) && valueRaw.equals(cie.valueRaw);
      }
  }
  