/*
 * 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.drill.exec.expr.fn;

import org.apache.drill.exec.expr.annotations.FunctionTemplate;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionCostCategory;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionScope;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling;

/**
 * Attributes of a function
 * Those are used in code generation and optimization.
 */
public class FunctionAttributes {

  private final FunctionTemplate template;
  private final String[] registeredNames;
  private final ValueReference[] parameters;
  private final ValueReference returnValue;
  private final WorkspaceReference[] workspaceVars;


  public FunctionAttributes (FunctionTemplate template,
                             ValueReference[] parameters,
                             ValueReference returnValue,
                             WorkspaceReference[] workspaceVars) {
    this.template = template;
    this.registeredNames = ((template.name().isEmpty()) ? template.names() : new String[] {template.name()});
    this.parameters = parameters;
    this.returnValue = returnValue;
    this.workspaceVars = workspaceVars;
  }

  public FunctionScope getScope() {
    return template.scope();
  }

  public FunctionTemplate.ReturnType getReturnType() {
    return template.returnType();
  }

  public NullHandling getNullHandling() {
    return template.nulls();
  }

  public boolean isBinaryCommutative() {
    return template.isBinaryCommutative();
  }

  @Deprecated
  public boolean isRandom() {
    return template.isRandom();
  }

  public boolean isDeterministic() {
    return !template.isRandom();
  }

  public String[] getRegisteredNames() {
    return registeredNames;
  }

  public ValueReference[] getParameters() {
    return parameters;
  }

  public ValueReference getReturnValue() {
    return returnValue;
  }

  public WorkspaceReference[] getWorkspaceVars() {
    return workspaceVars;
  }

  public FunctionCostCategory getCostCategory() {
    return template.costCategory();
  }

  public boolean isNiladic() {
    return template.isNiladic();
  }

  public boolean checkPrecisionRange() { return template.checkPrecisionRange(); }
}