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.arrow.gandiva.evaluator;
  
  import com.google.common.base.MoreObjects;
  import com.google.common.base.Objects;
  import java.util.List;
  import org.apache.arrow.vector.types.pojo.ArrowType;
  
  /** POJO to define a function signature. */
  public class FunctionSignature {
    private final String name;
    private final ArrowType returnType;
    private final List<ArrowType> paramTypes;
  
    public ArrowType getReturnType() {
      return returnType;
    }
  
    public List<ArrowType> getParamTypes() {
      return paramTypes;
    }
  
    public String getName() {
      return name;
    }
  
    /**
     * Ctor.
     *
     * @param name - name of the function.
     * @param returnType - data type of return
     * @param paramTypes - data type of input args.
     */
    public FunctionSignature(String name, ArrowType returnType, List<ArrowType> paramTypes) {
      this.name = name;
      this.returnType = returnType;
      this.paramTypes = paramTypes;
    }
  
    /**
     * Override equals.
     *
     * @param signature - signature to compare
     * @return true if equal and false if not.
     */
    public boolean equals(Object signature) {
      if (signature == null) {
        return false;
      }
      if (getClass() != signature.getClass()) {
        return false;
      }
      final FunctionSignature other = (FunctionSignature) signature;
      return this.name.equalsIgnoreCase(other.name)
          && Objects.equal(this.returnType, other.returnType)
          && Objects.equal(this.paramTypes, other.paramTypes);
    }
  
    @Override
    public int hashCode() {
      return Objects.hashCode(this.name.toLowerCase(), this.returnType, this.paramTypes);
    }
  
    @Override
    public String toString() {
      return MoreObjects.toStringHelper(this)
          .add("name ", name)
          .add("return type ", returnType)
          .add("param types ", paramTypes)
          .toString();
    }
  }
  