| /* |
| * 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 org.apache.calcite.avatica.util.TimeUnit; |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.rel.type.RelDataTypeFactoryImpl; |
| import org.apache.calcite.rel.type.RelDataTypeSystem; |
| import org.apache.calcite.sql.SqlDialect; |
| import org.apache.calcite.sql.SqlIntervalQualifier; |
| import org.apache.calcite.sql.SqlWriterConfig; |
| import org.apache.calcite.sql.dialect.AnsiSqlDialect; |
| import org.apache.calcite.sql.parser.SqlParserPos; |
| import org.apache.calcite.sql.pretty.SqlPrettyWriter; |
| import org.apache.calcite.sql.util.SqlString; |
| |
| import java.util.Objects; |
| |
| /** |
| * IntervalSqlType represents a standard SQL datetime interval type. |
| */ |
| public class IntervalSqlType extends AbstractSqlType { |
| //~ Instance fields -------------------------------------------------------- |
| |
| private final RelDataTypeSystem typeSystem; |
| private final SqlIntervalQualifier intervalQualifier; |
| |
| //~ Constructors ----------------------------------------------------------- |
| |
| /** |
| * Constructs an IntervalSqlType. This should only be called from a factory |
| * method. |
| */ |
| public IntervalSqlType(RelDataTypeSystem typeSystem, |
| SqlIntervalQualifier intervalQualifier, |
| boolean isNullable) { |
| super(intervalQualifier.typeName(), isNullable, null); |
| this.typeSystem = Objects.requireNonNull(typeSystem, "typeSystem"); |
| this.intervalQualifier = Objects.requireNonNull(intervalQualifier, "intervalQualifier"); |
| computeDigest(); |
| } |
| |
| //~ Methods ---------------------------------------------------------------- |
| |
| @Override protected void generateTypeString(StringBuilder sb, boolean withDetail) { |
| sb.append("INTERVAL "); |
| final SqlDialect dialect = AnsiSqlDialect.DEFAULT; |
| final SqlWriterConfig config = SqlPrettyWriter.config() |
| .withAlwaysUseParentheses(false) |
| .withSelectListItemsOnSeparateLines(false) |
| .withIndentation(0) |
| .withDialect(dialect); |
| final SqlPrettyWriter writer = new SqlPrettyWriter(config); |
| intervalQualifier.unparse(writer, 0, 0); |
| final String sql = writer.toString(); |
| sb.append(new SqlString(dialect, sql).getSql()); |
| } |
| |
| @Override public SqlIntervalQualifier getIntervalQualifier() { |
| return intervalQualifier; |
| } |
| |
| /** |
| * Combines two IntervalTypes and returns the result. E.g. the result of |
| * combining<br> |
| * <code>INTERVAL DAY TO HOUR</code><br> |
| * with<br> |
| * <code>INTERVAL SECOND</code> is<br> |
| * <code>INTERVAL DAY TO SECOND</code> |
| */ |
| public IntervalSqlType combine( |
| RelDataTypeFactoryImpl typeFactory, |
| IntervalSqlType that) { |
| assert this.typeName.isYearMonth() == that.typeName.isYearMonth(); |
| boolean nullable = isNullable || that.isNullable; |
| TimeUnit thisStart = Objects.requireNonNull(typeName.getStartUnit()); |
| TimeUnit thisEnd = typeName.getEndUnit(); |
| final TimeUnit thatStart = |
| Objects.requireNonNull(that.typeName.getStartUnit()); |
| final TimeUnit thatEnd = that.typeName.getEndUnit(); |
| |
| int secondPrec = |
| this.intervalQualifier.getStartPrecisionPreservingDefault(); |
| final int fracPrec = |
| SqlIntervalQualifier.combineFractionalSecondPrecisionPreservingDefault( |
| typeSystem, |
| this.intervalQualifier, |
| that.intervalQualifier); |
| |
| if (thisStart.ordinal() > thatStart.ordinal()) { |
| thisEnd = thisStart; |
| thisStart = thatStart; |
| secondPrec = |
| that.intervalQualifier.getStartPrecisionPreservingDefault(); |
| } else if (thisStart.ordinal() == thatStart.ordinal()) { |
| secondPrec = |
| SqlIntervalQualifier.combineStartPrecisionPreservingDefault( |
| typeFactory.getTypeSystem(), |
| this.intervalQualifier, |
| that.intervalQualifier); |
| } else if (null == thisEnd || thisEnd.ordinal() < thatStart.ordinal()) { |
| thisEnd = thatStart; |
| } |
| |
| if (null != thatEnd) { |
| if (null == thisEnd || thisEnd.ordinal() < thatEnd.ordinal()) { |
| thisEnd = thatEnd; |
| } |
| } |
| |
| RelDataType intervalType = |
| typeFactory.createSqlIntervalType( |
| new SqlIntervalQualifier( |
| thisStart, |
| secondPrec, |
| thisEnd, |
| fracPrec, |
| SqlParserPos.ZERO)); |
| intervalType = |
| typeFactory.createTypeWithNullability( |
| intervalType, |
| nullable); |
| return (IntervalSqlType) intervalType; |
| } |
| |
| @Override public int getPrecision() { |
| return intervalQualifier.getStartPrecision(typeSystem); |
| } |
| |
| @Override public int getScale() { |
| return intervalQualifier.getFractionalSecondPrecision(typeSystem); |
| } |
| } |