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.calcite.sql;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rel.type.RelDataTypeFactory;
  import org.apache.calcite.runtime.CalciteException;
  import org.apache.calcite.runtime.Resources;
  import org.apache.calcite.sql.parser.SqlParserPos;
  import org.apache.calcite.sql.validate.SqlValidatorException;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /**
   * <code>ExplicitOperatorBinding</code> implements {@link SqlOperatorBinding}
   * via an underlying array of known operand types.
   */
  public class ExplicitOperatorBinding extends SqlOperatorBinding {
    //~ Instance fields --------------------------------------------------------
  
    private final List<RelDataType> types;
    private final @Nullable SqlOperatorBinding delegate;
  
    //~ Constructors -----------------------------------------------------------
  
    public ExplicitOperatorBinding(
        SqlOperatorBinding delegate,
        List<RelDataType> types) {
      this(
          delegate,
          delegate.getTypeFactory(),
          delegate.getOperator(),
          types);
    }
  
    public ExplicitOperatorBinding(
        RelDataTypeFactory typeFactory,
        SqlOperator operator,
        List<RelDataType> types) {
      this(null, typeFactory, operator, types);
    }
  
    private ExplicitOperatorBinding(
        @Nullable SqlOperatorBinding delegate,
        RelDataTypeFactory typeFactory,
        SqlOperator operator,
        List<RelDataType> types) {
      super(typeFactory, operator);
      this.types = types;
      this.delegate = delegate;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    // implement SqlOperatorBinding
    @Override public int getOperandCount() {
      return types.size();
    }
  
    // implement SqlOperatorBinding
    @Override public RelDataType getOperandType(int ordinal) {
      return types.get(ordinal);
    }
  
    @Override public CalciteException newError(
        Resources.ExInst<SqlValidatorException> e) {
      if (delegate != null) {
        return delegate.newError(e);
      } else {
        return SqlUtil.newContextException(SqlParserPos.ZERO, e);
      }
    }
  
    @Override public boolean isOperandNull(int ordinal, boolean allowCast) {
      // NOTE jvs 1-May-2006:  This call is only relevant
      // for SQL validation, so anywhere else, just say
      // everything's OK.
      return false;
    }
  }
  