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Merge branch 'jdbc-to-arrow-config' into jdbc-column-metadata
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122
java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/JdbcToArrowConfig.java
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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. | ||
| */ | ||
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| package org.apache.arrow.adapter.jdbc; | ||
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| import java.util.Calendar; | ||
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| import org.apache.arrow.memory.BaseAllocator; | ||
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| import com.google.common.base.Preconditions; | ||
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| /** | ||
| * This class configures the JDBC-to-Arrow conversion process. | ||
| * <p> | ||
| * The allocator is used to construct the {@link org.apache.arrow.vector.VectorSchemaRoot}, | ||
| * and the calendar is used to define the time zone of any {@link org.apahe.arrow.vector.pojo.ArrowType.Timestamp} | ||
| * fields that are created during the conversion. | ||
| * </p> | ||
| * <p> | ||
| * Neither field may be <code>null</code>. | ||
| * </p> | ||
| */ | ||
| public final class JdbcToArrowConfig { | ||
| private Calendar calendar; | ||
| private BaseAllocator allocator; | ||
| private boolean includeMetadata; | ||
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| /** | ||
| * Constructs a new configuration from the provided allocator and calendar. The <code>allocator</code> | ||
| * is used when constructing the Arrow vectors from the ResultSet, and the calendar is used to define | ||
| * Arrow Timestamp fields, and to read time-based fields from the JDBC <code>ResultSet</code>. | ||
| * | ||
| * @param allocator The memory allocator to construct the Arrow vectors with. | ||
| * @param calendar The calendar to use when constructing Timestamp fields and reading time-based results. | ||
| */ | ||
| public JdbcToArrowConfig(BaseAllocator allocator, Calendar calendar) { | ||
| Preconditions.checkNotNull(allocator, "Memory allocator cannot be null"); | ||
| Preconditions.checkNotNull(calendar, "Calendar object can not be null"); | ||
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| this.allocator = allocator; | ||
| this.calendar = calendar; | ||
| this.includeMetadata = false; | ||
| } | ||
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| public JdbcToArrowConfig(BaseAllocator allocator, Calendar calendar, boolean includeMetadata) { | ||
| this(allocator, calendar); | ||
| this.includeMetadata = includeMetadata; | ||
| } | ||
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| /** | ||
| * The calendar to use when defining Arrow Timestamp fields | ||
| * and retrieving time-based fields from the database. | ||
| * @return the calendar. | ||
| */ | ||
| public Calendar getCalendar() { | ||
| return calendar; | ||
| } | ||
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| /** | ||
| * Sets the {@link Calendar} to use when constructing timestamp fields in the | ||
| * Arrow schema, and reading time-based fields from the JDBC <code>ResultSet</code>. | ||
| * | ||
| * @param calendar the calendar to set. | ||
| * @exception NullPointerExeption if <code>calendar</code> is <code>null</code>. | ||
| */ | ||
| public JdbcToArrowConfig setCalendar(Calendar calendar) { | ||
| Preconditions.checkNotNull(calendar, "Calendar object can not be null"); | ||
| this.calendar = calendar; | ||
| return this; | ||
| } | ||
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| /** | ||
| * The Arrow memory allocator. | ||
| * @return the allocator. | ||
| */ | ||
| public BaseAllocator getAllocator() { | ||
| return allocator; | ||
| } | ||
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| /** | ||
| * Sets the memory allocator to use when construting the Arrow vectors from the ResultSet. | ||
| * | ||
| * @param allocator the allocator to set. | ||
| * @exception NullPointerException if <code>allocator</code> is null. | ||
| */ | ||
| public JdbcToArrowConfig setAllocator(BaseAllocator allocator) { | ||
| Preconditions.checkNotNull(allocator, "Memory allocator cannot be null"); | ||
| this.allocator = allocator; | ||
| return this; | ||
| } | ||
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| public boolean includeMetadata() { | ||
| return includeMetadata; | ||
| } | ||
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| /** | ||
| * Whether this configuration is valid. The configuration is valid when: | ||
| * <ul> | ||
| * <li>A memory allocator is provided.</li> | ||
| * <li>A calendar is provided.</li> | ||
| * </ul> | ||
| * | ||
| * @return Whether this configuration is valid. | ||
| */ | ||
| public boolean isValid() { | ||
| return (calendar != null) && (allocator != null); | ||
| } | ||
| } |
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78 changes: 78 additions & 0 deletions
78
java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/JdbcToArrowConfigTest.java
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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. | ||
| */ | ||
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| package org.apache.arrow.adapter.jdbc; | ||
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| import static org.junit.Assert.*; | ||
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| import java.util.Calendar; | ||
| import java.util.Locale; | ||
| import java.util.TimeZone; | ||
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| import org.apache.arrow.memory.BaseAllocator; | ||
| import org.apache.arrow.memory.RootAllocator; | ||
| import org.junit.Test; | ||
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| public class JdbcToArrowConfigTest { | ||
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| private static final RootAllocator allocator = new RootAllocator(Integer.MAX_VALUE); | ||
| private static final Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"), Locale.ROOT); | ||
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| @Test(expected = NullPointerException.class) | ||
| public void testNullArguments() { | ||
| new JdbcToArrowConfig(null, null); | ||
| } | ||
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| @Test(expected = NullPointerException.class) | ||
| public void testNullCalendar() { | ||
| new JdbcToArrowConfig(allocator, null); | ||
| } | ||
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| @Test(expected = NullPointerException.class) | ||
| public void testNullAllocator() { | ||
| new JdbcToArrowConfig(null, calendar); | ||
| } | ||
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| @Test(expected = NullPointerException.class) | ||
| public void testSetNullAllocator() { | ||
| JdbcToArrowConfig config = new JdbcToArrowConfig(allocator, calendar); | ||
| config.setAllocator(null); | ||
| } | ||
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| @Test(expected = NullPointerException.class) | ||
| public void testSetNullCalendar() { | ||
| JdbcToArrowConfig config = new JdbcToArrowConfig(allocator, calendar); | ||
| config.setCalendar(null); | ||
| } | ||
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| @Test | ||
| public void testConfig() { | ||
| JdbcToArrowConfig config = new JdbcToArrowConfig(allocator, calendar); | ||
| assertTrue(config.isValid()); | ||
| assertTrue(allocator == config.getAllocator()); | ||
| assertTrue(calendar == config.getCalendar()); | ||
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| Calendar newCalendar = Calendar.getInstance(); | ||
| BaseAllocator newAllocator = new RootAllocator(Integer.SIZE); | ||
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| config.setAllocator(newAllocator).setCalendar(newCalendar); | ||
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| assertTrue(config.isValid()); | ||
| assertTrue(newAllocator == config.getAllocator()); | ||
| assertTrue(newCalendar == config.getCalendar()); | ||
| } | ||
| } |
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