io.vertx.sqlclient.data.NullValue Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2021 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
* which is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
*/
package io.vertx.sqlclient.data;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.json.JsonArray;
import io.vertx.core.json.JsonObject;
import java.math.BigDecimal;
import java.time.*;
import java.time.temporal.Temporal;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.UUID;
/**
* Instances of this class indicate the type associated with a {@code NULL} column value.
* This is useful when infering database types from {@link io.vertx.sqlclient.Tuple} items.
*/
public class NullValue {
// We only cache instances for JDK types and some Vert.x types (JSON/Buffer)
private static final Map, NullValue> cached = new HashMap<>();
public static final NullValue Boolean = createAndCache(Boolean.class);
public static final NullValue Short = createAndCache(Short.class);
public static final NullValue Integer = createAndCache(Integer.class);
public static final NullValue Long = createAndCache(Long.class);
public static final NullValue Float = createAndCache(Float.class);
public static final NullValue Double = createAndCache(Double.class);
public static final NullValue String = createAndCache(String.class);
public static final NullValue JsonObject = createAndCache(JsonObject.class);
public static final NullValue JsonArray = createAndCache(JsonArray.class);
public static final NullValue Temporal = createAndCache(Temporal.class);
public static final NullValue LocalDate = createAndCache(LocalDate.class);
public static final NullValue LocalTime = createAndCache(LocalTime.class);
public static final NullValue LocalDateTime = createAndCache(LocalDateTime.class);
public static final NullValue OffsetTime = createAndCache(OffsetTime.class);
public static final NullValue OffsetDateTime = createAndCache(OffsetDateTime.class);
public static final NullValue Buffer = createAndCache(Buffer.class);
public static final NullValue UUID = createAndCache(UUID.class);
public static final NullValue BigDecimal = createAndCache(BigDecimal.class);
public static final NullValue ArrayOfBoolean = createAndCache(Boolean[].class);
public static final NullValue ArrayOfShort = createAndCache(Short[].class);
public static final NullValue ArrayOfInteger = createAndCache(Integer[].class);
public static final NullValue ArrayOfLong = createAndCache(Long[].class);
public static final NullValue ArrayOfFloat = createAndCache(Float[].class);
public static final NullValue ArrayOfDouble = createAndCache(Double[].class);
public static final NullValue ArrayOfString = createAndCache(String[].class);
public static final NullValue ArrayOfJsonObject = createAndCache(JsonObject[].class);
public static final NullValue ArrayOfJsonArray = createAndCache(JsonArray[].class);
public static final NullValue ArrayOfTemporal = createAndCache(Temporal[].class);
public static final NullValue ArrayOfLocalDate = createAndCache(LocalDate[].class);
public static final NullValue ArrayOfLocalTime = createAndCache(LocalTime[].class);
public static final NullValue ArrayOfLocalDateTime = createAndCache(LocalDateTime[].class);
public static final NullValue ArrayOfOffsetTime = createAndCache(OffsetTime[].class);
public static final NullValue ArrayOfOffsetDateTime = createAndCache(OffsetDateTime[].class);
public static final NullValue ArrayOfBuffer = createAndCache(Buffer[].class);
public static final NullValue ArrayOfUUID = createAndCache(UUID[].class);
public static final NullValue ArrayOfBigDecimal = createAndCache(BigDecimal[].class);
private static NullValue createAndCache(Class type) {
NullValue instance = new NullValue(type);
cached.put(type, instance);
return instance;
}
private final Class type;
private NullValue(Class type) {
this.type = type;
}
public static NullValue of(Class type) {
NullValue instance = cached.get(Objects.requireNonNull(type, "type cannot be null"));
if (instance == null) {
boolean array = type.isArray();
Class c = array ? type.getComponentType() : type;
if (java.time.temporal.Temporal.class.isAssignableFrom(c)) {
instance = array ? ArrayOfTemporal : Temporal;
} else if (io.vertx.core.buffer.Buffer.class.isAssignableFrom(c)) {
instance = array ? ArrayOfBuffer : Buffer;
} else {
instance = new NullValue(type);
}
}
return instance;
}
/**
* @return the type associated with a {@code NULL} column value
*/
public Class type() {
return type;
}
}