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.core.metadata.schema;
  
  import com.datastax.oss.driver.api.core.CqlIdentifier;
  import com.datastax.oss.driver.api.core.type.DataType;
  import com.datastax.oss.driver.internal.core.metadata.schema.ScriptBuilder;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import java.util.List;
  
  /** A CQL function in the schema metadata. */
  public interface FunctionMetadata extends Describable {
  
    @NonNull
    CqlIdentifier getKeyspace();
  
    @NonNull
    FunctionSignature getSignature();
  
    /**
     * The names of the parameters. This is in the same order as {@code
     * getSignature().getParameterTypes()}
     */
    @NonNull
    List<CqlIdentifier> getParameterNames();
  
    @NonNull
    String getBody();
  
    boolean isCalledOnNullInput();
  
    @NonNull
    String getLanguage();
  
    @NonNull
    DataType getReturnType();
  
    @NonNull
    @Override
    default String describe(boolean pretty) {
      ScriptBuilder builder = new ScriptBuilder(pretty);
      builder
          .append("CREATE FUNCTION ")
          .append(getKeyspace())
          .append(".")
          .append(getSignature().getName())
          .append("(");
      boolean first = true;
      for (int i = 0; i < getSignature().getParameterTypes().size(); i++) {
        if (first) {
          first = false;
        } else {
          builder.append(",");
        }
        DataType type = getSignature().getParameterTypes().get(i);
        CqlIdentifier name = getParameterNames().get(i);
        builder.append(name).append(" ").append(type.asCql(false, pretty));
      }
      return builder
          .append(")")
          .increaseIndent()
          .newLine()
          .append(isCalledOnNullInput() ? "CALLED ON NULL INPUT" : "RETURNS NULL ON NULL INPUT")
          .newLine()
          .append("RETURNS ")
          .append(getReturnType().asCql(false, true))
          .newLine()
          .append("LANGUAGE ")
          .append(getLanguage())
          .newLine()
          .append("AS '")
          .append(getBody())
          .append("';")
          .build();
    }
  
    @NonNull
    @Override
    default String describeWithChildren(boolean pretty) {
      // A function has no children
      return describe(pretty);
    }
  }
  