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/*
 * 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.hazelcast.org.apache.calcite.sql.validate;

import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.sql.SqlNode;

import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;

import static java.util.Objects.requireNonNull;

/**
 * Implementation of {@link SqlValidatorNamespace} for a field of a record.
 *
 * 

A field is not a very interesting namespace - except if the field has a * record or multiset type - but this class exists to make fields behave * similarly to other records for purposes of name resolution. */ class FieldNamespace extends AbstractNamespace { //~ Constructors ----------------------------------------------------------- /** * Creates a FieldNamespace. * * @param validator Validator * @param dataType Data type of field */ FieldNamespace( SqlValidatorImpl validator, RelDataType dataType) { super(validator, null); assert dataType != null; this.rowType = dataType; } //~ Methods ---------------------------------------------------------------- @Override public void setType(RelDataType type) { throw new UnsupportedOperationException(); } @Override protected RelDataType validateImpl(RelDataType targetRowType) { return requireNonNull(rowType, "rowType"); } @Override public @Nullable SqlNode getNode() { return null; } @Override public @Nullable SqlValidatorNamespace lookupChild(String name) { if (requireNonNull(rowType, "rowType").isStruct()) { return validator.lookupFieldNamespace( rowType, name); } return null; } @Override public boolean fieldExists(String name) { return false; } }





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