com.datastax.oss.driver.internal.core.type.codec.DateCodec Maven / Gradle / Ivy
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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.datastax.oss.driver.internal.core.type.codec;
import static java.lang.Long.parseLong;
import com.datastax.oss.driver.api.core.ProtocolVersion;
import com.datastax.oss.driver.api.core.type.DataType;
import com.datastax.oss.driver.api.core.type.DataTypes;
import com.datastax.oss.driver.api.core.type.codec.TypeCodec;
import com.datastax.oss.driver.api.core.type.codec.TypeCodecs;
import com.datastax.oss.driver.api.core.type.reflect.GenericType;
import com.datastax.oss.driver.internal.core.util.Strings;
import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;
import java.nio.ByteBuffer;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import net.jcip.annotations.ThreadSafe;
@ThreadSafe
public class DateCodec implements TypeCodec {
private static final LocalDate EPOCH = LocalDate.of(1970, 1, 1);
@NonNull
@Override
public GenericType getJavaType() {
return GenericType.LOCAL_DATE;
}
@NonNull
@Override
public DataType getCqlType() {
return DataTypes.DATE;
}
@Override
public boolean accepts(@NonNull Object value) {
return value instanceof LocalDate;
}
@Override
public boolean accepts(@NonNull Class javaClass) {
return javaClass == LocalDate.class;
}
@Nullable
@Override
public ByteBuffer encode(@Nullable LocalDate value, @NonNull ProtocolVersion protocolVersion) {
if (value == null) {
return null;
}
long days = ChronoUnit.DAYS.between(EPOCH, value);
int unsigned = signedToUnsigned((int) days);
return TypeCodecs.INT.encodePrimitive(unsigned, protocolVersion);
}
@Nullable
@Override
public LocalDate decode(@Nullable ByteBuffer bytes, @NonNull ProtocolVersion protocolVersion) {
if (bytes == null || bytes.remaining() == 0) {
return null;
}
int unsigned = TypeCodecs.INT.decodePrimitive(bytes, protocolVersion);
int signed = unsignedToSigned(unsigned);
return EPOCH.plusDays(signed);
}
@NonNull
@Override
public String format(@Nullable LocalDate value) {
return (value == null) ? "NULL" : Strings.quote(DateTimeFormatter.ISO_LOCAL_DATE.format(value));
}
@Nullable
@Override
public LocalDate parse(@Nullable String value) {
if (value == null || value.isEmpty() || value.equalsIgnoreCase("NULL")) {
return null;
}
// single quotes are optional for long literals, mandatory for date patterns
// strip enclosing single quotes, if any
if (Strings.isQuoted(value)) {
value = Strings.unquote(value);
}
if (Strings.isLongLiteral(value)) {
long raw;
try {
raw = parseLong(value);
} catch (NumberFormatException e) {
throw new IllegalArgumentException(
String.format("Cannot parse date value from \"%s\"", value));
}
int days;
try {
days = cqlDateToDaysSinceEpoch(raw);
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException(
String.format("Cannot parse date value from \"%s\"", value));
}
return EPOCH.plusDays(days);
}
try {
return LocalDate.parse(value, DateTimeFormatter.ISO_LOCAL_DATE);
} catch (RuntimeException e) {
throw new IllegalArgumentException(
String.format("Cannot parse date value from \"%s\"", value));
}
}
private static int signedToUnsigned(int signed) {
return signed - Integer.MIN_VALUE;
}
private static int unsignedToSigned(int unsigned) {
return unsigned + Integer.MIN_VALUE; // this relies on overflow for "negative" values
}
/**
* Converts a raw CQL long representing a numeric DATE literal to the number of days since the
* Epoch. In CQL, numeric DATE literals are longs (unsigned integers actually) between 0 and 2^32
* - 1, with the epoch in the middle; this method re-centers the epoch at 0.
*/
private static int cqlDateToDaysSinceEpoch(long raw) {
if (raw < 0 || raw > MAX_CQL_LONG_VALUE)
throw new IllegalArgumentException(
String.format(
"Numeric literals for DATE must be between 0 and %d (got %d)",
MAX_CQL_LONG_VALUE, raw));
return (int) (raw - EPOCH_AS_CQL_LONG);
}
private static final long MAX_CQL_LONG_VALUE = ((1L << 32) - 1);
private static final long EPOCH_AS_CQL_LONG = (1L << 31);
}