| /* |
| * 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.type; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.ImmutableSet; |
| |
| import java.util.EnumSet; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Rules that determine whether a type is assignable from another type. |
| */ |
| public class SqlTypeAssignmentRule implements SqlTypeMappingRule { |
| //~ Static fields/initializers --------------------------------------------- |
| |
| private static final SqlTypeAssignmentRule INSTANCE; |
| |
| //~ Instance fields -------------------------------------------------------- |
| |
| private final Map<SqlTypeName, ImmutableSet<SqlTypeName>> map; |
| |
| //~ Constructors ----------------------------------------------------------- |
| |
| /** |
| * Creates a {@code SqlTypeAssignmentRules} with specified type mappings {@code map}. |
| * |
| * <p>Make this constructor private intentionally, use {@link #instance()}. |
| * |
| * @param map The type mapping, for each map entry, the values types can be assigned to |
| * the key type |
| */ |
| private SqlTypeAssignmentRule( |
| Map<SqlTypeName, ImmutableSet<SqlTypeName>> map) { |
| this.map = ImmutableMap.copyOf(map); |
| } |
| |
| static { |
| final SqlTypeMappingRules.Builder rules = SqlTypeMappingRules.builder(); |
| |
| final Set<SqlTypeName> rule = new HashSet<>(); |
| |
| // IntervalYearMonth is assignable from... |
| for (SqlTypeName interval : SqlTypeName.YEAR_INTERVAL_TYPES) { |
| rules.add(interval, SqlTypeName.YEAR_INTERVAL_TYPES); |
| } |
| for (SqlTypeName interval : SqlTypeName.DAY_INTERVAL_TYPES) { |
| rules.add(interval, SqlTypeName.DAY_INTERVAL_TYPES); |
| } |
| |
| // MULTISET is assignable from... |
| rules.add(SqlTypeName.MULTISET, EnumSet.of(SqlTypeName.MULTISET)); |
| |
| // TINYINT is assignable from... |
| rules.add(SqlTypeName.TINYINT, EnumSet.of(SqlTypeName.TINYINT)); |
| |
| // SMALLINT is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.TINYINT); |
| rule.add(SqlTypeName.SMALLINT); |
| rules.add(SqlTypeName.SMALLINT, rule); |
| |
| // INTEGER is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.TINYINT); |
| rule.add(SqlTypeName.SMALLINT); |
| rule.add(SqlTypeName.INTEGER); |
| rules.add(SqlTypeName.INTEGER, rule); |
| |
| // BIGINT is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.TINYINT); |
| rule.add(SqlTypeName.SMALLINT); |
| rule.add(SqlTypeName.INTEGER); |
| rule.add(SqlTypeName.BIGINT); |
| rules.add(SqlTypeName.BIGINT, rule); |
| |
| // FLOAT (up to 64 bit floating point) is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.TINYINT); |
| rule.add(SqlTypeName.SMALLINT); |
| rule.add(SqlTypeName.INTEGER); |
| rule.add(SqlTypeName.BIGINT); |
| rule.add(SqlTypeName.DECIMAL); |
| rule.add(SqlTypeName.FLOAT); |
| rules.add(SqlTypeName.FLOAT, rule); |
| |
| // REAL (32 bit floating point) is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.TINYINT); |
| rule.add(SqlTypeName.SMALLINT); |
| rule.add(SqlTypeName.INTEGER); |
| rule.add(SqlTypeName.BIGINT); |
| rule.add(SqlTypeName.DECIMAL); |
| rule.add(SqlTypeName.FLOAT); |
| rule.add(SqlTypeName.REAL); |
| rules.add(SqlTypeName.REAL, rule); |
| |
| // DOUBLE is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.TINYINT); |
| rule.add(SqlTypeName.SMALLINT); |
| rule.add(SqlTypeName.INTEGER); |
| rule.add(SqlTypeName.BIGINT); |
| rule.add(SqlTypeName.DECIMAL); |
| rule.add(SqlTypeName.FLOAT); |
| rule.add(SqlTypeName.REAL); |
| rule.add(SqlTypeName.DOUBLE); |
| rules.add(SqlTypeName.DOUBLE, rule); |
| |
| // DECIMAL is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.TINYINT); |
| rule.add(SqlTypeName.SMALLINT); |
| rule.add(SqlTypeName.INTEGER); |
| rule.add(SqlTypeName.BIGINT); |
| rule.add(SqlTypeName.REAL); |
| rule.add(SqlTypeName.DOUBLE); |
| rule.add(SqlTypeName.DECIMAL); |
| rules.add(SqlTypeName.DECIMAL, rule); |
| |
| // VARBINARY is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.VARBINARY); |
| rule.add(SqlTypeName.BINARY); |
| rules.add(SqlTypeName.VARBINARY, rule); |
| |
| // CHAR is assignable from... |
| rules.add(SqlTypeName.CHAR, EnumSet.of(SqlTypeName.CHAR)); |
| |
| // VARCHAR is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.CHAR); |
| rule.add(SqlTypeName.VARCHAR); |
| rules.add(SqlTypeName.VARCHAR, rule); |
| |
| // BOOLEAN is assignable from... |
| rules.add(SqlTypeName.BOOLEAN, EnumSet.of(SqlTypeName.BOOLEAN)); |
| |
| // BINARY is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.BINARY); |
| rule.add(SqlTypeName.VARBINARY); |
| rules.add(SqlTypeName.BINARY, rule); |
| |
| // DATE is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.DATE); |
| rules.add(SqlTypeName.DATE, rule); |
| |
| // TIME is assignable from... |
| rule.clear(); |
| rule.add(SqlTypeName.TIME); |
| rules.add(SqlTypeName.TIME, rule); |
| |
| // TIME WITH LOCAL TIME ZONE is assignable from... |
| rules.add(SqlTypeName.TIME_WITH_LOCAL_TIME_ZONE, |
| EnumSet.of(SqlTypeName.TIME_WITH_LOCAL_TIME_ZONE)); |
| |
| // TIMESTAMP is assignable from ... |
| rules.add(SqlTypeName.TIMESTAMP, EnumSet.of(SqlTypeName.TIMESTAMP)); |
| |
| // TIMESTAMP WITH LOCAL TIME ZONE is assignable from... |
| rules.add(SqlTypeName.TIMESTAMP_WITH_LOCAL_TIME_ZONE, |
| EnumSet.of(SqlTypeName.TIMESTAMP_WITH_LOCAL_TIME_ZONE)); |
| |
| // GEOMETRY is assignable from ... |
| rule.clear(); |
| rule.add(SqlTypeName.GEOMETRY); |
| rule.add(SqlTypeName.CHAR); |
| rule.add(SqlTypeName.VARCHAR); |
| rules.add(SqlTypeName.GEOMETRY, rule); |
| |
| // ARRAY is assignable from ... |
| rules.add(SqlTypeName.ARRAY, EnumSet.of(SqlTypeName.ARRAY)); |
| |
| // MAP is assignable from ... |
| rules.add(SqlTypeName.MAP, EnumSet.of(SqlTypeName.MAP)); |
| |
| // ANY is assignable from ... |
| rule.clear(); |
| rule.add(SqlTypeName.TINYINT); |
| rule.add(SqlTypeName.SMALLINT); |
| rule.add(SqlTypeName.INTEGER); |
| rule.add(SqlTypeName.BIGINT); |
| rule.add(SqlTypeName.DECIMAL); |
| rule.add(SqlTypeName.FLOAT); |
| rule.add(SqlTypeName.REAL); |
| rule.add(SqlTypeName.TIME); |
| rule.add(SqlTypeName.DATE); |
| rule.add(SqlTypeName.TIMESTAMP); |
| rules.add(SqlTypeName.ANY, rule); |
| |
| INSTANCE = new SqlTypeAssignmentRule(rules.map); |
| } |
| |
| //~ Methods ---------------------------------------------------------------- |
| |
| /** Returns an instance. */ |
| public static SqlTypeAssignmentRule instance() { |
| return INSTANCE; |
| } |
| |
| @Override public Map<SqlTypeName, ImmutableSet<SqlTypeName>> getTypeMapping() { |
| return this.map; |
| } |
| } |