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.api.querybuilder.term;
  
  import com.datastax.oss.driver.api.core.CqlIdentifier;
  import com.datastax.oss.driver.api.core.cql.Statement;
  import com.datastax.oss.driver.api.core.type.DataType;
  import com.datastax.oss.driver.api.querybuilder.BuildableQuery;
  import com.datastax.oss.driver.api.querybuilder.CqlSnippet;
  import com.datastax.oss.driver.api.querybuilder.QueryBuilder;
  import com.datastax.oss.driver.api.querybuilder.relation.Relation;
  import com.datastax.oss.driver.api.querybuilder.select.OngoingSelection;
  import com.datastax.oss.driver.api.querybuilder.select.Selector;
  
  /**
   * A simple expression that doesn't reference columns.
   *
   * <p>It is used as an argument to certain {@linkplain Selector selectors} (for example the indices
   * in a {@linkplain OngoingSelection#range(Selector, Term, Term) range}), or as the right operand of
   * {@linkplain Relation relations}.
   *
   * <p>To create a term, call one of the static factory methods in {@link QueryBuilder}:
   *
   * <ul>
   *   <li>{@link QueryBuilder#literal(Object) literal()} to inline a Java object into the query
   *       string;
   *   <li>{@link QueryBuilder#function(CqlIdentifier, CqlIdentifier, Iterable) function()} to invoke
   *       a built-in or user-defined function;
   *   <li>an arithmetic operator combining other terms: {@link QueryBuilder#add(Term, Term) add()},
   *       {@link QueryBuilder#subtract(Term, Term) subtract()}, {@link QueryBuilder#negate(Term)
   *       negate()}, {@link QueryBuilder#multiply(Term, Term) multiply()}, {@link
   *       QueryBuilder#divide(Term, Term) divide()} or {@link QueryBuilder#remainder(Term, Term)
   *       remainder()};
   *   <li>{@link QueryBuilder#typeHint(Term, DataType) typeHint()} to coerce another term to a
   *       particular CQL type;
   *   <li>{@link QueryBuilder#raw(String) raw()} for a raw CQL snippet.
   * </ul>
   *
   * Note that some of these methods have multiple overloads.
   */
  public interface Term extends CqlSnippet {
  
    /**
     * Whether the term is idempotent.
     *
     * <p>That is, whether it always produces the same result when used multiple times. For example,
     * the literal {@code 1} is idempotent, the function call {@code now()} isn't.
     *
     * <p>This is used internally by the query builder to compute the {@link Statement#isIdempotent()}
     * flag on the statements generated by {@link BuildableQuery#build()}. If a term is ambiguous (for
     * example a raw snippet or a call to a user function), the builder is pessimistic and assumes the
     * term is not idempotent.
     */
    boolean isIdempotent();
  }
  